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< a href = 'https://github.com/akkartik/mu/blob/main/boot.subx' > https://github.com/akkartik/mu/blob/main/boot.subx< / a >
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< span id = "L1" class = "LineNr" > 1 < / span > < span class = "subxComment" > # Code for the first few disk sectors that all programs in this directory need:< / span >
< span id = "L2" class = "LineNr" > 2 < / span > < span class = "subxComment" > # - load sectors past the first (using BIOS primitives) since only the first is available by default< / span >
< span id = "L3" class = "LineNr" > 3 < / span > < span class = "subxComment" > # - if this fails, print 'D' at top-left of screen and halt< / span >
< span id = "L4" class = "LineNr" > 4 < / span > < span class = "subxComment" > # - initialize a minimal graphics mode< / span >
< span id = "L5" class = "LineNr" > 5 < / span > < span class = "subxComment" > # - switch to 32-bit mode (giving up access to BIOS primitives)< / span >
< span id = "L6" class = "LineNr" > 6 < / span > < span class = "subxComment" > # - set up a handler for keyboard events< / span >
< span id = "L7" class = "LineNr" > 7 < / span > < span class = "subxComment" > # - jump to start of program< / span >
< span id = "L8" class = "LineNr" > 8 < / span >
< span id = "L9" class = "LineNr" > 9 < / span > < span class = "subxComment" > # Code in this file needs to be more deliberate about the SubX facilities it< / span >
< span id = "L10" class = "LineNr" > 10 < / span > < span class = "subxComment" > # uses:< / span >
< span id = "L11" class = "LineNr" > 11 < / span > < span class = "subxComment" > # - sigils only support 32-bit general-purpose registers, so don't work with segment registers or 16-bit or 8-bit registers< / span >
< span id = "L12" class = "LineNr" > 12 < / span > < span class = "subxComment" > # - metadata like rm32 and r32 can sometimes misleadingly refer to only the bottom 16 bits of the register; pay attention to the register name< / span >
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< span id = "L13" class = "LineNr" > 13 < / span > < span class = "subxComment" > #< / span >
< span id = "L14" class = "LineNr" > 14 < / span > < span class = "subxComment" > # While most of Mu is thoroughly tested, this file is not. I don't yet< / span >
< span id = "L15" class = "LineNr" > 15 < / span > < span class = "subxComment" > # understand hardware interfaces well enough to explain to others.< / span >
< span id = "L16" class = "LineNr" > 16 < / span >
< span id = "L17" class = "LineNr" > 17 < / span > < span class = "subxComment" > # Memory map of a Mu computer:< / span >
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< span id = "L18" class = "LineNr" > 18 < / span > < span class = "subxComment" > # code: currently 4 tracks loaded from the primary disk to [0x00007c00, 0x00048600)< / span >
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< span id = "L19" class = "LineNr" > 19 < / span > < span class = "subxComment" > # stack: grows down from 0x02000000 to 0x01000000< / span >
< span id = "L20" class = "LineNr" > 20 < / span > < span class = "subxComment" > # heap: [0x02000000, 0x08000000)< / span >
< span id = "L21" class = "LineNr" > 21 < / span > < span class = "subxComment" > # see 120allocate.subx; Qemu initializes with 128MB RAM by default< / span >
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< span id = "L22" class = "LineNr" > 22 < / span > < span class = "subxComment" > # Consult < a href = "https://wiki.osdev.org/Memory_Map_(x86)" > https://wiki.osdev.org/Memory_Map_(x86)< / a > before modifying any of< / span >
< span id = "L23" class = "LineNr" > 23 < / span > < span class = "subxComment" > # this. And don't forget to keep *stack-debug.subx in sync.< / span >
< span id = "L24" class = "LineNr" > 24 < / span >
< span id = "L25" class = "LineNr" > 25 < / span > == code
< span id = "L26" class = "LineNr" > 26 < / span >
< span id = "L27" class = "LineNr" > 27 < / span > < span class = "subxComment" > ## 16-bit entry point: 0x7c00< / span >
< span id = "L28" class = "LineNr" > 28 < / span >
< span id = "L29" class = "LineNr" > 29 < / span > < span class = "subxComment" > # Upon reset, the IBM PC:< / span >
< span id = "L30" class = "LineNr" > 30 < / span > < span class = "subxComment" > # - loads the first sector (512 bytes)< / span >
< span id = "L31" class = "LineNr" > 31 < / span > < span class = "subxComment" > # from some bootable image (look for the boot-sector-marker further down this file)< / span >
< span id = "L32" class = "LineNr" > 32 < / span > < span class = "subxComment" > # to the address range [0x7c00, 0x7e00)< / span >
< span id = "L33" class = "LineNr" > 33 < / span > < span class = "subxComment" > # - starts executing code at address 0x7c00< / span >
< span id = "L34" class = "LineNr" > 34 < / span >
< span id = "L35" class = "LineNr" > 35 < / span > fa/disable-interrupts
< span id = "L36" class = "LineNr" > 36 < / span >
< span id = "L37" class = "LineNr" > 37 < / span > < span class = "subxComment" > # initialize segment registers< / span >
< span id = "L38" class = "LineNr" > 38 < / span > b8/copy-to-ax 0/imm16
< span id = "L39" class = "LineNr" > 39 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 3/r32/ds
< span id = "L40" class = "LineNr" > 40 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 0/r32/es
< span id = "L41" class = "LineNr" > 41 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 4/r32/fs
< span id = "L42" class = "LineNr" > 42 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 5/r32/gs
< span id = "L43" class = "LineNr" > 43 < / span >
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< span id = "L44" class = "LineNr" > 44 < / span > < span class = "subxComment" > # Temporarily initialize stack to 0x00070000 in real mode.< / span >
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< span id = "L45" class = "LineNr" > 45 < / span > < span class = "subxComment" > # We don't read or write the stack before we get to 32-bit mode, but BIOS< / span >
< span id = "L46" class = "LineNr" > 46 < / span > < span class = "subxComment" > # calls do. We need to move the stack in case BIOS initializes it to some< / span >
< span id = "L47" class = "LineNr" > 47 < / span > < span class = "subxComment" > # low address that we want to write code into.< / span >
< span id = "L48" class = "LineNr" > 48 < / span > b8/copy-to-ax 0x7000/imm16
< span id = "L49" class = "LineNr" > 49 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 2/r32/ss
< span id = "L50" class = "LineNr" > 50 < / span > bc/copy-to-esp 0/imm16
< span id = "L51" class = "LineNr" > 51 < / span >
< span id = "L52" class = "LineNr" > 52 < / span > < span class = "subxComment" > # undo the A20 hack: < a href = "https://en.wikipedia.org/wiki/A20_line" > https://en.wikipedia.org/wiki/A20_line< / a > < / span >
< span id = "L53" class = "LineNr" > 53 < / span > < span class = "subxComment" > # this is from < a href = "https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S" > https://github.com/mit-pdos/xv6-public/blob/master/bootasm.S< / a > < / span >
< span id = "L54" class = "LineNr" > 54 < / span > {
< span id = "L55" class = "LineNr" > 55 < / span > e4/read-port-into-al 0x64/imm8
< span id = "L56" class = "LineNr" > 56 < / span > a8/test-bits-in-al 0x02/imm8 < span class = "subxComment" > # set zf if bit 1 (second-least significant) is not set< / span >
< span id = "L57" class = "LineNr" > 57 < / span > 75/jump-if-!zero < span class = "Constant" > loop< / span > /disp8
< span id = "L58" class = "LineNr" > 58 < / span > b0/copy-to-al 0xd1/imm8
< span id = "L59" class = "LineNr" > 59 < / span > e6/write-al-into-port 0x64/imm8
< span id = "L60" class = "LineNr" > 60 < / span > }
< span id = "L61" class = "LineNr" > 61 < / span > {
< span id = "L62" class = "LineNr" > 62 < / span > e4/read-port-into-al 0x64/imm8
< span id = "L63" class = "LineNr" > 63 < / span > a8/test-bits-in-al 0x02/imm8 < span class = "subxComment" > # set zf if bit 1 (second-least significant) is not set< / span >
< span id = "L64" class = "LineNr" > 64 < / span > 75/jump-if-!zero < span class = "Constant" > loop< / span > /disp8
< span id = "L65" class = "LineNr" > 65 < / span > b0/copy-to-al 0xdf/imm8
< span id = "L66" class = "LineNr" > 66 < / span > e6/write-al-into-port 0x64/imm8
< span id = "L67" class = "LineNr" > 67 < / span > }
< span id = "L68" class = "LineNr" > 68 < / span >
< span id = "L69" class = "LineNr" > 69 < / span > < span class = "subxComment" > # load remaining sectors from first two tracks of disk into addresses [0x7e00, 0x17800)< / span >
< span id = "L70" class = "LineNr" > 70 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L71" class = "LineNr" > 71 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L72" class = "LineNr" > 72 < / span > b5/copy-to-ch 0/imm8/cylinder
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< span id = "L73" class = "LineNr" > 73 < / span > b6/copy-to-dh 0/imm8/head < span class = "subxComment" > # < ====< / span >
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< span id = "L74" class = "LineNr" > 74 < / span > b1/copy-to-cl 2/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L75" class = "LineNr" > 75 < / span > b0/copy-to-al 0x7d/imm8/num-sectors < span class = "subxComment" > # 2*63 - 1 = 125< / span >
< span id = "L76" class = "LineNr" > 76 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x7e00, contiguous with boot segment< / span >
< span id = "L77" class = "LineNr" > 77 < / span > bb/copy-to-bx 0/imm16
< span id = "L78" class = "LineNr" > 78 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
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< span id = "L79" class = "LineNr" > 79 < / span > bb/copy-to-bx 0x7e00/imm16 < span class = "subxComment" > # < ====< / span >
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< span id = "L80" class = "LineNr" > 80 < / span > cd/syscall 0x13/imm8/bios-disk-services
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< span id = "L81" class = "LineNr" > 81 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
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< span id = "L82" class = "LineNr" > 82 < / span >
< span id = "L83" class = "LineNr" > 83 < / span > < span class = "subxComment" > # load two more tracks of disk into addresses [0x17800, 0x27400)< / span >
< span id = "L84" class = "LineNr" > 84 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L85" class = "LineNr" > 85 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L86" class = "LineNr" > 86 < / span > b5/copy-to-ch 0/imm8/cylinder
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< span id = "L87" class = "LineNr" > 87 < / span > b6/copy-to-dh 2/imm8/head < span class = "subxComment" > # < ====< / span >
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< span id = "L88" class = "LineNr" > 88 < / span > b1/copy-to-cl 1/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L89" class = "LineNr" > 89 < / span > b0/copy-to-al 0x7e/imm8/num-sectors < span class = "subxComment" > # 2*63 = 126< / span >
< span id = "L90" class = "LineNr" > 90 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x17800, contiguous with boot segment< / span >
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< span id = "L91" class = "LineNr" > 91 < / span > bb/copy-to-bx 0x1780/imm16 < span class = "subxComment" > # < ====< / span >
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< span id = "L92" class = "LineNr" > 92 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L93" class = "LineNr" > 93 < / span > bb/copy-to-bx 0/imm16
< span id = "L94" class = "LineNr" > 94 < / span > cd/syscall 0x13/imm8/bios-disk-services
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< span id = "L95" class = "LineNr" > 95 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
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< span id = "L96" class = "LineNr" > 96 < / span >
< span id = "L97" class = "LineNr" > 97 < / span > < span class = "subxComment" > # load two more tracks of disk into addresses [0x27400, 0x37000)< / span >
< span id = "L98" class = "LineNr" > 98 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L99" class = "LineNr" > 99 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L100" class = "LineNr" > 100 < / span > b5/copy-to-ch 0/imm8/cylinder
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< span id = "L101" class = "LineNr" > 101 < / span > b6/copy-to-dh 4/imm8/head < span class = "subxComment" > # < ====< / span >
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< span id = "L102" class = "LineNr" > 102 < / span > b1/copy-to-cl 1/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L103" class = "LineNr" > 103 < / span > b0/copy-to-al 0x7e/imm8/num-sectors < span class = "subxComment" > # 2*63 = 126< / span >
< span id = "L104" class = "LineNr" > 104 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x27400, contiguous with boot segment< / span >
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< span id = "L105" class = "LineNr" > 105 < / span > bb/copy-to-bx 0x2740/imm16 < span class = "subxComment" > # < ====< / span >
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< span id = "L106" class = "LineNr" > 106 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L107" class = "LineNr" > 107 < / span > bb/copy-to-bx 0/imm16
< span id = "L108" class = "LineNr" > 108 < / span > cd/syscall 0x13/imm8/bios-disk-services
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< span id = "L109" class = "LineNr" > 109 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
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< span id = "L110" class = "LineNr" > 110 < / span >
< span id = "L111" class = "LineNr" > 111 < / span > < span class = "subxComment" > # load two more tracks of disk into addresses [0x37000, 0x46c00)< / span >
< span id = "L112" class = "LineNr" > 112 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L113" class = "LineNr" > 113 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L114" class = "LineNr" > 114 < / span > b5/copy-to-ch 0/imm8/cylinder
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< span id = "L115" class = "LineNr" > 115 < / span > b6/copy-to-dh 6/imm8/head < span class = "subxComment" > # < ====< / span >
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< span id = "L116" class = "LineNr" > 116 < / span > b1/copy-to-cl 1/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L117" class = "LineNr" > 117 < / span > b0/copy-to-al 0x7e/imm8/num-sectors < span class = "subxComment" > # 2*63 = 126< / span >
< span id = "L118" class = "LineNr" > 118 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x37000, contiguous with boot segment< / span >
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< span id = "L119" class = "LineNr" > 119 < / span > bb/copy-to-bx 0x3700/imm16 < span class = "subxComment" > # < ====< / span >
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< span id = "L120" class = "LineNr" > 120 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L121" class = "LineNr" > 121 < / span > bb/copy-to-bx 0/imm16
< span id = "L122" class = "LineNr" > 122 < / span > cd/syscall 0x13/imm8/bios-disk-services
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< span id = "L123" class = "LineNr" > 123 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
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< span id = "L124" class = "LineNr" > 124 < / span >
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< span id = "L125" class = "LineNr" > 125 < / span > < span class = "subxComment" > # load two more tracks of disk into addresses [0x46c00, 0x56800)< / span >
< span id = "L126" class = "LineNr" > 126 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L127" class = "LineNr" > 127 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L128" class = "LineNr" > 128 < / span > b5/copy-to-ch 0/imm8/cylinder
< span id = "L129" class = "LineNr" > 129 < / span > b6/copy-to-dh 8/imm8/head < span class = "subxComment" > # < ====< / span >
< span id = "L130" class = "LineNr" > 130 < / span > b1/copy-to-cl 1/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L131" class = "LineNr" > 131 < / span > b0/copy-to-al 0x7e/imm8/num-sectors < span class = "subxComment" > # 2*63 = 126< / span >
< span id = "L132" class = "LineNr" > 132 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x46c00, contiguous with boot segment< / span >
< span id = "L133" class = "LineNr" > 133 < / span > bb/copy-to-bx 0x46c0/imm16 < span class = "subxComment" > # < ====< / span >
< span id = "L134" class = "LineNr" > 134 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L135" class = "LineNr" > 135 < / span > bb/copy-to-bx 0/imm16
< span id = "L136" class = "LineNr" > 136 < / span > cd/syscall 0x13/imm8/bios-disk-services
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< span id = "L137" class = "LineNr" > 137 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
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< span id = "L138" class = "LineNr" > 138 < / span >
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< span id = "L139" class = "LineNr" > 139 < / span > < span class = "subxComment" > # load two more tracks of disk into addresses [0x56800, 0x66400)< / span >
< span id = "L140" class = "LineNr" > 140 < / span > b4/copy-to-ah 2/imm8/read-drive
< span id = "L141" class = "LineNr" > 141 < / span > < span class = "subxComment" > # dl comes conveniently initialized at boot time with the index of the device being booted< / span >
< span id = "L142" class = "LineNr" > 142 < / span > b5/copy-to-ch 0/imm8/cylinder
< span id = "L143" class = "LineNr" > 143 < / span > b6/copy-to-dh 0xa/imm8/head < span class = "subxComment" > # < ====< / span >
< span id = "L144" class = "LineNr" > 144 < / span > b1/copy-to-cl 1/imm8/sector < span class = "subxComment" > # 1-based< / span >
< span id = "L145" class = "LineNr" > 145 < / span > b0/copy-to-al 0x7e/imm8/num-sectors < span class = "subxComment" > # 2*63 = 126< / span >
< span id = "L146" class = "LineNr" > 146 < / span > < span class = "subxComment" > # address to write sectors to = es:bx = 0x56800, contiguous with boot segment< / span >
< span id = "L147" class = "LineNr" > 147 < / span > bb/copy-to-bx 0x5680/imm16 < span class = "subxComment" > # < ====< / span >
< span id = "L148" class = "LineNr" > 148 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L149" class = "LineNr" > 149 < / span > bb/copy-to-bx 0/imm16
< span id = "L150" class = "LineNr" > 150 < / span > cd/syscall 0x13/imm8/bios-disk-services
< span id = "L151" class = "LineNr" > 151 < / span > 0f 82/jump-if-carry < a href = 'boot.subx.html#L189' > disk_error< / a > /disp16
< span id = "L152" class = "LineNr" > 152 < / span >
< span id = "L153" class = "LineNr" > 153 < / span > < span class = "subxComment" > # reset es< / span >
< span id = "L154" class = "LineNr" > 154 < / span > bb/copy-to-bx 0/imm16
< span id = "L155" class = "LineNr" > 155 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 0/r32/es
< span id = "L156" class = "LineNr" > 156 < / span >
< span id = "L157" class = "LineNr" > 157 < / span > < span class = "subxComment" > # adjust video mode< / span >
< span id = "L158" class = "LineNr" > 158 < / span > b4/copy-to-ah 0x4f/imm8 < span class = "subxComment" > # VBE commands< / span >
< span id = "L159" class = "LineNr" > 159 < / span > b0/copy-to-al 2/imm8 < span class = "subxComment" > # set video mode< / span >
< span id = "L160" class = "LineNr" > 160 < / span > bb/copy-to-bx 0x4105/imm16 < span class = "subxComment" > # 0x0105 | 0x4000< / span >
< span id = "L161" class = "LineNr" > 161 < / span > < span class = "subxComment" > # 0x0105 = graphics mode 1024x768x256< / span >
< span id = "L162" class = "LineNr" > 162 < / span > < span class = "subxComment" > # (alternative candidate: 0x0101 for 640x480x256)< / span >
< span id = "L163" class = "LineNr" > 163 < / span > < span class = "subxComment" > # 0x4000 bit = configure linear frame buffer in Bochs emulator; hopefully this doesn't hurt anything when running natively< / span >
< span id = "L164" class = "LineNr" > 164 < / span > cd/syscall 0x10/imm8/bios-video-services
< span id = "L165" class = "LineNr" > 165 < / span >
< span id = "L166" class = "LineNr" > 166 < / span > < span class = "subxComment" > # load information for the (hopefully) current video mode< / span >
< span id = "L167" class = "LineNr" > 167 < / span > < span class = "subxComment" > # mostly just for the address to the linear frame buffer< / span >
< span id = "L168" class = "LineNr" > 168 < / span > b4/copy-to-ah 0x4f/imm8 < span class = "subxComment" > # VBE commands< / span >
< span id = "L169" class = "LineNr" > 169 < / span > b0/copy-to-al 1/imm8 < span class = "subxComment" > # get video mode info< / span >
< span id = "L170" class = "LineNr" > 170 < / span > b9/copy-to-cx 0x0105/imm16 < span class = "subxComment" > # mode we requested< / span >
< span id = "L171" class = "LineNr" > 171 < / span > bf/copy-to-di < span class = "SpecialChar" > < a href = 'boot.subx.html#L616' > Video-mode-info< / a > < / span > /imm16
< span id = "L172" class = "LineNr" > 172 < / span > cd/syscall 0x10/imm8/bios-video-services
< span id = "L173" class = "LineNr" > 173 < / span >
< span id = "L174" class = "LineNr" > 174 < / span > < span class = "subxComment" > ## switch to 32-bit mode< / span >
< span id = "L175" class = "LineNr" > 175 < / span > < span class = "subxComment" > # load global descriptor table< / span >
< span id = "L176" class = "LineNr" > 176 < / span > < span class = "subxComment" > # We can't refer to the label directly because SubX doesn't do the right< / span >
< span id = "L177" class = "LineNr" > 177 < / span > < span class = "subxComment" > # thing for lgdt, so rather than make errors worse in most places we instead< / span >
< span id = "L178" class = "LineNr" > 178 < / span > < span class = "subxComment" > # pin gdt_descriptor below.< / span >
< span id = "L179" class = "LineNr" > 179 < / span > 0f 01 2/subop/lgdt 0/mod/indirect 6/rm32/use-disp16 0x7de0/disp16/gdt_descriptor
< span id = "L180" class = "LineNr" > 180 < / span > < span class = "subxComment" > # enable paging< / span >
< span id = "L181" class = "LineNr" > 181 < / span > 0f 20/< -cr 3/mod/direct 0/rm32/eax 0/r32/cr0
< span id = "L182" class = "LineNr" > 182 < / span > 66 83 1/subop/or 3/mod/direct 0/rm32/eax 1/imm8 < span class = "subxComment" > # eax < - or 0x1< / span >
< span id = "L183" class = "LineNr" > 183 < / span > 0f 22/-> cr 3/mod/direct 0/rm32/eax 0/r32/cr0
< span id = "L184" class = "LineNr" > 184 < / span > < span class = "subxComment" > # far jump to initialize_32bit_mode that sets cs to offset 8 in the gdt in the process< / span >
< span id = "L185" class = "LineNr" > 185 < / span > < span class = "subxComment" > # We can't refer to the label directly because SubX doesn't have syntax for< / span >
< span id = "L186" class = "LineNr" > 186 < / span > < span class = "subxComment" > # segment selectors. So we instead pin initialize_32bit_mode below.< / span >
< span id = "L187" class = "LineNr" > 187 < / span > ea/jump-far-absolute 0x00087e00/disp32 < span class = "subxComment" > # address 0x7e00 in offset 8 of the gdt< / span >
2021-05-31 17:47:05 +00:00
< span id = "L188" class = "LineNr" > 188 < / span >
2021-06-16 04:50:13 +00:00
< span id = "L189" class = "LineNr" > 189 < / span > < span class = "subxFunction" > disk_error< / span > :
< span id = "L190" class = "LineNr" > 190 < / span > < span class = "subxComment" > # print 'D' to top-left of screen to indicate disk error< / span >
< span id = "L191" class = "LineNr" > 191 < / span > < span class = "subxComment" > # *0xb8000 < - 0x0f44< / span >
< span id = "L192" class = "LineNr" > 192 < / span > bb/copy-to-bx 0xb800/imm16
< span id = "L193" class = "LineNr" > 193 < / span > 8e/-> seg 3/mod/direct 3/rm32/bx 3/r32/ds
< span id = "L194" class = "LineNr" > 194 < / span > b0/copy-to-al 0x44/imm8/D
< span id = "L195" class = "LineNr" > 195 < / span > b4/copy-to-ah 0x0f/imm8/white-on-black
< span id = "L196" class = "LineNr" > 196 < / span > bb/copy-to-bx 0/imm16
< span id = "L197" class = "LineNr" > 197 < / span > 89/< - 0/mod/indirect 7/rm32/bx 0/r32/ax < span class = "subxComment" > # *ds:bx < - ax< / span >
< span id = "L198" class = "LineNr" > 198 < / span > < span class = "subxComment" > # loop forever< / span >
< span id = "L199" class = "LineNr" > 199 < / span > {
< span id = "L200" class = "LineNr" > 200 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L201" class = "LineNr" > 201 < / span > }
< span id = "L202" class = "LineNr" > 202 < / span >
< span id = "L203" class = "LineNr" > 203 < / span > < span class = "subxComment" > ## GDT: 3 records of 8 bytes each< / span >
< span id = "L204" class = "LineNr" > 204 < / span > == data 0x7de0
< span id = "L205" class = "LineNr" > 205 < / span > < span class = "subxFunction" > gdt_descriptor< / span > :
< span id = "L206" class = "LineNr" > 206 < / span > 0x17/imm16 < span class = "subxComment" > # final index of gdt = size of gdt - 1< / span >
< span id = "L207" class = "LineNr" > 207 < / span > < a href = 'boot.subx.html#L209' > gdt_start< / a > /imm32/start
< span id = "L208" class = "LineNr" > 208 < / span >
< span id = "L209" class = "LineNr" > 209 < / span > < span class = "subxFunction" > gdt_start< / span > :
< span id = "L210" class = "LineNr" > 210 < / span > < span class = "subxComment" > # offset 0: gdt_null: mandatory null descriptor< / span >
< span id = "L211" class = "LineNr" > 211 < / span > 00 00 00 00 00 00 00 00
< span id = "L212" class = "LineNr" > 212 < / span > < span class = "subxComment" > # offset 8: gdt_code< / span >
< span id = "L213" class = "LineNr" > 213 < / span > ff ff < span class = "subxComment" > # limit[0:16]< / span >
< span id = "L214" class = "LineNr" > 214 < / span > 00 00 00 < span class = "subxComment" > # base[0:24]< / span >
< span id = "L215" class = "LineNr" > 215 < / span > 9a < span class = "subxComment" > # 1/present 00/privilege 1/descriptor type = 1001b< / span >
< span id = "L216" class = "LineNr" > 216 < / span > < span class = "subxComment" > # 1/code 0/conforming 1/readable 0/accessed = 1010b< / span >
< span id = "L217" class = "LineNr" > 217 < / span > cf < span class = "subxComment" > # 1/granularity 1/32-bit 0/64-bit-segment 0/AVL = 1100b< / span >
< span id = "L218" class = "LineNr" > 218 < / span > < span class = "subxComment" > # limit[16:20] = 1111b< / span >
< span id = "L219" class = "LineNr" > 219 < / span > 00 < span class = "subxComment" > # base[24:32]< / span >
< span id = "L220" class = "LineNr" > 220 < / span > < span class = "subxComment" > # offset 16: gdt_data< / span >
< span id = "L221" class = "LineNr" > 221 < / span > ff ff < span class = "subxComment" > # limit[0:16]< / span >
< span id = "L222" class = "LineNr" > 222 < / span > 00 00 00 < span class = "subxComment" > # base[0:24]< / span >
< span id = "L223" class = "LineNr" > 223 < / span > 92 < span class = "subxComment" > # 1/present 00/privilege 1/descriptor type = 1001b< / span >
< span id = "L224" class = "LineNr" > 224 < / span > < span class = "subxComment" > # 0/data 0/conforming 1/readable 0/accessed = 0010b< / span >
< span id = "L225" class = "LineNr" > 225 < / span > cf < span class = "subxComment" > # same as gdt_code< / span >
< span id = "L226" class = "LineNr" > 226 < / span > 00 < span class = "subxComment" > # base[24:32]< / span >
< span id = "L227" class = "LineNr" > 227 < / span > < span class = "subxComment" > # gdt_end:< / span >
< span id = "L228" class = "LineNr" > 228 < / span >
< span id = "L229" class = "LineNr" > 229 < / span > == boot-sector-marker 0x7dfe
< span id = "L230" class = "LineNr" > 230 < / span > < span class = "subxComment" > # final 2 bytes of boot sector< / span >
< span id = "L231" class = "LineNr" > 231 < / span > 55 aa
< span id = "L232" class = "LineNr" > 232 < / span >
< span id = "L233" class = "LineNr" > 233 < / span > < span class = "subxComment" > ## sector 2 onwards loaded by load_disk, not automatically on boot< / span >
< span id = "L234" class = "LineNr" > 234 < / span >
< span id = "L235" class = "LineNr" > 235 < / span > < span class = "subxComment" > ## 32-bit code from this point< / span >
< span id = "L236" class = "LineNr" > 236 < / span >
< span id = "L237" class = "LineNr" > 237 < / span > == code 0x7e00
< span id = "L238" class = "LineNr" > 238 < / span > < span class = "subxFunction" > initialize_32bit_mode< / span > :
< span id = "L239" class = "LineNr" > 239 < / span > 66 b8/copy-to-ax 0x10/imm16 < span class = "subxComment" > # offset 16 from gdt_start< / span >
< span id = "L240" class = "LineNr" > 240 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 3/r32/ds
< span id = "L241" class = "LineNr" > 241 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 2/r32/ss
< span id = "L242" class = "LineNr" > 242 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 0/r32/es
< span id = "L243" class = "LineNr" > 243 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 4/r32/fs
< span id = "L244" class = "LineNr" > 244 < / span > 8e/-> seg 3/mod/direct 0/rm32/ax 5/r32/gs
< span id = "L245" class = "LineNr" > 245 < / span >
< span id = "L246" class = "LineNr" > 246 < / span > bc/copy-to-esp 0x02000000/imm32
< span id = "L247" class = "LineNr" > 247 < / span >
< span id = "L248" class = "LineNr" > 248 < / span > < span class = "subxComment" > ## load interrupt handlers< / span >
< span id = "L249" class = "LineNr" > 249 < / span > < span class = "subxComment" > # We can't refer to the label directly because SubX doesn't do the right< / span >
< span id = "L250" class = "LineNr" > 250 < / span > < span class = "subxComment" > # thing for lidt, so rather than make errors worse in most places we instead< / span >
< span id = "L251" class = "LineNr" > 251 < / span > < span class = "subxComment" > # pin idt_descriptor below.< / span >
< span id = "L252" class = "LineNr" > 252 < / span > 0f 01 3/subop/lidt 0/mod/indirect 5/rm32/use-disp32 0x7f00/disp32/idt_descriptor
< span id = "L253" class = "LineNr" > 253 < / span >
< span id = "L254" class = "LineNr" > 254 < / span > < span class = "subxComment" > # For now, not bothering reprogramming the IRQ to not conflict with software< / span >
< span id = "L255" class = "LineNr" > 255 < / span > < span class = "subxComment" > # exceptions.< / span >
< span id = "L256" class = "LineNr" > 256 < / span > < span class = "subxComment" > # < a href = "https://wiki.osdev.org/index.php?title=8259_PIC&oldid=24650#Protected_Mode" > https://wiki.osdev.org/index.php?title=8259_PIC& oldid=24650#Protected_Mode< / a > < / span >
< span id = "L257" class = "LineNr" > 257 < / span > < span class = "subxComment" > #< / span >
< span id = "L258" class = "LineNr" > 258 < / span > < span class = "subxComment" > # Interrupt 1 (keyboard) conflicts with debugger faults. We don't use a< / span >
< span id = "L259" class = "LineNr" > 259 < / span > < span class = "subxComment" > # debugger.< / span >
< span id = "L260" class = "LineNr" > 260 < / span > < span class = "subxComment" > # Reference:< / span >
< span id = "L261" class = "LineNr" > 261 < / span > < span class = "subxComment" > # < a href = "https://wiki.osdev.org/Exceptions" > https://wiki.osdev.org/Exceptions< / a > < / span >
< span id = "L262" class = "LineNr" > 262 < / span >
< span id = "L263" class = "LineNr" > 263 < / span > < span class = "subxComment" > # enable timer IRQ0 and keyboard IRQ1< / span >
< span id = "L264" class = "LineNr" > 264 < / span > b0/copy-to-al 0xfc/imm8 < span class = "subxComment" > # disable mask for IRQ0 and IRQ1< / span >
< span id = "L265" class = "LineNr" > 265 < / span > e6/write-al-into-port 0x21/imm8
< span id = "L266" class = "LineNr" > 266 < / span >
< span id = "L267" class = "LineNr" > 267 < / span > fb/enable-interrupts
< span id = "L268" class = "LineNr" > 268 < / span >
< span id = "L269" class = "LineNr" > 269 < / span > (< a href = 'boot.subx.html#L1520' > initialize-mouse< / a > )
< span id = "L270" class = "LineNr" > 270 < / span >
< span id = "L271" class = "LineNr" > 271 < / span > < span class = "subxComment" > ## enable floating point< / span >
< span id = "L272" class = "LineNr" > 272 < / span > db/floating-point-coprocessor e3/initialize
< span id = "L273" class = "LineNr" > 273 < / span > < span class = "subxComment" > # eax < - cr4< / span >
< span id = "L274" class = "LineNr" > 274 < / span > 0f 20/< -cr 3/mod/direct 0/rm32/eax 4/r32/cr4
< span id = "L275" class = "LineNr" > 275 < / span > < span class = "subxComment" > # eax < - or bit 9< / span >
< span id = "L276" class = "LineNr" > 276 < / span > 0f ba/bit-test 5/subop/bit-test-and-set 3/mod/direct 0/rm32/eax 9/imm8
< span id = "L277" class = "LineNr" > 277 < / span > < span class = "subxComment" > # cr4 < - eax< / span >
< span id = "L278" class = "LineNr" > 278 < / span > 0f 22/-> cr 3/mod/direct 0/rm32/eax 4/r32/cr4
< span id = "L279" class = "LineNr" > 279 < / span >
< span id = "L280" class = "LineNr" > 280 < / span > e9/jump < span class = "SpecialChar" > Entry< / span > /disp32
< span id = "L281" class = "LineNr" > 281 < / span >
< span id = "L282" class = "LineNr" > 282 < / span > == data 0x7f00
< span id = "L283" class = "LineNr" > 283 < / span > < span class = "subxFunction" > idt_descriptor< / span > :
< span id = "L284" class = "LineNr" > 284 < / span > ff 03 < span class = "subxComment" > # final index of idt = size of idt - 1< / span >
< span id = "L285" class = "LineNr" > 285 < / span > < a href = 'boot.subx.html#L289' > idt_start< / a > /imm32/start
< span id = "L286" class = "LineNr" > 286 < / span >
< span id = "L287" class = "Folded" > 287 < / span > < span class = "Folded" > +-- 55 lines: # interrupt descriptor table ----------------------------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L342" class = "LineNr" > 342 < / span >
< span id = "L343" class = "LineNr" > 343 < / span > == code
< span id = "L344" class = "LineNr" > 344 < / span >
< span id = "L345" class = "LineNr" > 345 < / span > < span class = "subxFunction" > null-interrupt-handler< / span > :
< span id = "L346" class = "LineNr" > 346 < / span > < span class = "subxComment" > # prologue< / span >
< span id = "L347" class = "LineNr" > 347 < / span > < span class = "subxComment" > # Don't disable interrupts; the timer has the highest priority anyway,< / span >
< span id = "L348" class = "LineNr" > 348 < / span > < span class = "subxComment" > # and this interrupt triggers extremely frequently.< / span >
< span id = "L349" class = "LineNr" > 349 < / span > fa/disable-interrupts
< span id = "L350" class = "LineNr" > 350 < / span > 60/push-all-registers
< span id = "L351" class = "LineNr" > 351 < / span > 9c/push-flags
< span id = "L352" class = "LineNr" > 352 < / span > < span class = "subxComment" > # acknowledge interrupt< / span >
< span id = "L353" class = "LineNr" > 353 < / span > b0/copy-to-al 0x20/imm8
< span id = "L354" class = "LineNr" > 354 < / span > e6/write-al-into-port 0x20/imm8
< span id = "L355" class = "LineNr" > 355 < / span > 31/xor %eax 0/r32/eax
< span id = "L356" class = "LineNr" > 356 < / span > < span class = "Constant" > $null-interrupt-handler:epilogue< / span > :
< span id = "L357" class = "LineNr" > 357 < / span > < span class = "subxComment" > # epilogue< / span >
< span id = "L358" class = "LineNr" > 358 < / span > 9d/pop-flags
< span id = "L359" class = "LineNr" > 359 < / span > 61/pop-all-registers
< span id = "L360" class = "LineNr" > 360 < / span > fb/enable-interrupts
< span id = "L361" class = "LineNr" > 361 < / span > cf/return-from-interrupt
< span id = "L362" class = "LineNr" > 362 < / span >
< span id = "L363" class = "LineNr" > 363 < / span > < span class = "subxFunction" > timer-interrupt-handler< / span > :
< span id = "L364" class = "LineNr" > 364 < / span > < span class = "subxComment" > # prologue< / span >
< span id = "L365" class = "LineNr" > 365 < / span > < span class = "subxComment" > # Don't disable interrupts; the timer has the highest priority anyway,< / span >
< span id = "L366" class = "LineNr" > 366 < / span > < span class = "subxComment" > # and this interrupt triggers extremely frequently.< / span >
< span id = "L367" class = "LineNr" > 367 < / span > fa/disable-interrupts
< span id = "L368" class = "LineNr" > 368 < / span > 60/push-all-registers
< span id = "L369" class = "LineNr" > 369 < / span > 9c/push-flags
< span id = "L370" class = "LineNr" > 370 < / span > < span class = "subxComment" > # acknowledge interrupt< / span >
< span id = "L371" class = "LineNr" > 371 < / span > b0/copy-to-al 0x20/imm8
< span id = "L372" class = "LineNr" > 372 < / span > e6/write-al-into-port 0x20/imm8
< span id = "L373" class = "LineNr" > 373 < / span > 31/xor %eax 0/r32/eax
< span id = "L374" class = "LineNr" > 374 < / span > < span class = "Constant" > $timer-interrupt-handler:epilogue< / span > :
< span id = "L375" class = "LineNr" > 375 < / span > < span class = "subxComment" > # epilogue< / span >
< span id = "L376" class = "LineNr" > 376 < / span > 9d/pop-flags
< span id = "L377" class = "LineNr" > 377 < / span > 61/pop-all-registers
< span id = "L378" class = "LineNr" > 378 < / span > fb/enable-interrupts
< span id = "L379" class = "LineNr" > 379 < / span > cf/return-from-interrupt
< span id = "L380" class = "LineNr" > 380 < / span >
< span id = "L381" class = "LineNr" > 381 < / span > < span class = "subxFunction" > keyboard-interrupt-handler< / span > :
< span id = "L382" class = "LineNr" > 382 < / span > < span class = "subxComment" > # prologue< / span >
< span id = "L383" class = "LineNr" > 383 < / span > fa/disable-interrupts
< span id = "L384" class = "LineNr" > 384 < / span > 60/push-all-registers
< span id = "L385" class = "LineNr" > 385 < / span > 9c/push-flags
< span id = "L386" class = "LineNr" > 386 < / span > < span class = "subxComment" > # acknowledge interrupt< / span >
< span id = "L387" class = "LineNr" > 387 < / span > b0/copy-to-al 0x20/imm8
< span id = "L388" class = "LineNr" > 388 < / span > e6/write-al-into-port 0x20/imm8
< span id = "L389" class = "LineNr" > 389 < / span > 31/xor %eax 0/r32/eax
< span id = "L390" class = "LineNr" > 390 < / span > < span class = "subxComment" > # check output buffer of 8042 keyboard controller (< a href = "https://web.archive.org/web/20040604041507/http://panda.cs.ndsu.nodak.edu/~achapwes/PICmicro/keyboard/atkeyboard.html)" > https://web.archive.org/web/20040604041507/http://panda.cs.ndsu.nodak.edu/~achapwes/PICmicro/keyboard/atkeyboard.html)< / a > < / span >
< span id = "L391" class = "LineNr" > 391 < / span > e4/read-port-into-al 0x64/imm8
< span id = "L392" class = "LineNr" > 392 < / span > a8/test-bits-in-al 0x01/imm8 < span class = "subxComment" > # set zf if bit 0 (least significant) is not set< / span >
< span id = "L393" class = "LineNr" > 393 < / span > 0f 84/jump-if-not-set $keyboard-interrupt-handler:epilogue/disp32
< span id = "L394" class = "LineNr" > 394 < / span > < span class = "subxH1Comment" > # - if keyboard buffer is full, return< / span >
< span id = "L395" class = "LineNr" > 395 < / span > < span class = "subxComment" > # var dest-addr/ecx: (addr byte) = (keyboard-buffer + *keyboard-buffer:write)< / span >
< span id = "L396" class = "LineNr" > 396 < / span > 31/xor %ecx 1/r32/ecx
< span id = "L397" class = "LineNr" > 397 < / span > 8a/byte-> *< span class = "SpecialChar" > Keyboard-buffer< / span > :< a href = '108write.subx.html#L11' > write< / a > 1/r32/cl
< span id = "L398" class = "LineNr" > 398 < / span > 81 0/subop/add %ecx < span class = "SpecialChar" > Keyboard-buffer< / span > :data/imm32
< span id = "L399" class = "LineNr" > 399 < / span > < span class = "subxComment" > # al = *dest-addr< / span >
< span id = "L400" class = "LineNr" > 400 < / span > 8a/byte-> *ecx 0/r32/al
< span id = "L401" class = "LineNr" > 401 < / span > < span class = "subxComment" > # if (al != 0) return< / span >
< span id = "L402" class = "LineNr" > 402 < / span > 3c/compare-al-and 0/imm8
< span id = "L403" class = "LineNr" > 403 < / span > 0f 85/jump-if-!= $keyboard-interrupt-handler:epilogue/disp32
< span id = "L404" class = "LineNr" > 404 < / span > < span class = "subxH1Comment" > # - read keycode< / span >
< span id = "L405" class = "LineNr" > 405 < / span > e4/read-port-into-al 0x60/imm8
< span id = "L406" class = "LineNr" > 406 < / span > < span class = "subxH1Comment" > # - key released< / span >
< span id = "L407" class = "LineNr" > 407 < / span > < span class = "subxComment" > # if (al == 0xaa) shift = false # left shift is being lifted< / span >
2021-04-21 15:28:00 +00:00
< span id = "L408" class = "LineNr" > 408 < / span > {
2021-06-16 04:50:13 +00:00
< span id = "L409" class = "LineNr" > 409 < / span > 3c/compare-al-and 0xaa/imm8
2021-04-21 15:28:00 +00:00
< span id = "L410" class = "LineNr" > 410 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
2021-06-16 04:50:13 +00:00
< span id = "L411" class = "LineNr" > 411 < / span > < span class = "subxComment" > # *shift = 0< / span >
< span id = "L412" class = "LineNr" > 412 < / span > c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32
2021-05-31 17:47:05 +00:00
< span id = "L413" class = "LineNr" > 413 < / span > }
2021-06-16 04:50:13 +00:00
< span id = "L414" class = "LineNr" > 414 < / span > < span class = "subxComment" > # if (al == 0xb6) shift = false # right shift is being lifted< / span >
< span id = "L415" class = "LineNr" > 415 < / span > {
< span id = "L416" class = "LineNr" > 416 < / span > 3c/compare-al-and 0xb6/imm8
< span id = "L417" class = "LineNr" > 417 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
< span id = "L418" class = "LineNr" > 418 < / span > < span class = "subxComment" > # *shift = 0< / span >
< span id = "L419" class = "LineNr" > 419 < / span > c7 0/subop/copy *Keyboard-shift-pressed? 0/imm32
< span id = "L420" class = "LineNr" > 420 < / span > }
< span id = "L421" class = "LineNr" > 421 < / span > < span class = "subxComment" > # if (al == 0x9d) ctrl = false # ctrl is being lifted< / span >
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< span id = "L422" class = "LineNr" > 422 < / span > {
2021-06-16 04:50:13 +00:00
< span id = "L423" class = "LineNr" > 423 < / span > 3c/compare-al-and 0x9d/imm8
2021-05-31 17:47:05 +00:00
< span id = "L424" class = "LineNr" > 424 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
2021-06-16 04:50:13 +00:00
< span id = "L425" class = "LineNr" > 425 < / span > < span class = "subxComment" > # *ctrl = 0< / span >
< span id = "L426" class = "LineNr" > 426 < / span > c7 0/subop/copy *Keyboard-ctrl-pressed? 0/imm32
< span id = "L427" class = "LineNr" > 427 < / span > }
< span id = "L428" class = "LineNr" > 428 < / span > < span class = "subxComment" > # if (al & 0x80) a key is being lifted; return< / span >
< span id = "L429" class = "LineNr" > 429 < / span > 50/push-eax
< span id = "L430" class = "LineNr" > 430 < / span > 24/and-al-with 0x80/imm8
< span id = "L431" class = "LineNr" > 431 < / span > 3c/compare-al-and 0/imm8
< span id = "L432" class = "LineNr" > 432 < / span > 58/pop-to-eax
< span id = "L433" class = "LineNr" > 433 < / span > 75/jump-if-!= $keyboard-interrupt-handler:epilogue/disp8
< span id = "L434" class = "LineNr" > 434 < / span > < span class = "subxH1Comment" > # - key pressed< / span >
< span id = "L435" class = "LineNr" > 435 < / span > < span class = "subxComment" > # if (al == 0x2a) shift = true, return # left shift pressed< / span >
< span id = "L436" class = "LineNr" > 436 < / span > {
< span id = "L437" class = "LineNr" > 437 < / span > 3c/compare-al-and 0x2a/imm8
< span id = "L438" class = "LineNr" > 438 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
< span id = "L439" class = "LineNr" > 439 < / span > < span class = "subxComment" > # *shift = 1< / span >
< span id = "L440" class = "LineNr" > 440 < / span > c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32
< span id = "L441" class = "LineNr" > 441 < / span > < span class = "subxComment" > # return< / span >
< span id = "L442" class = "LineNr" > 442 < / span > eb/jump $keyboard-interrupt-handler:epilogue/disp8
< span id = "L443" class = "LineNr" > 443 < / span > }
< span id = "L444" class = "LineNr" > 444 < / span > < span class = "subxComment" > # if (al == 0x36) shift = true, return # right shift pressed< / span >
< span id = "L445" class = "LineNr" > 445 < / span > {
< span id = "L446" class = "LineNr" > 446 < / span > 3c/compare-al-and 0x36/imm8
< span id = "L447" class = "LineNr" > 447 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
< span id = "L448" class = "LineNr" > 448 < / span > < span class = "subxComment" > # *shift = 1< / span >
< span id = "L449" class = "LineNr" > 449 < / span > c7 0/subop/copy *Keyboard-shift-pressed? 1/imm32
< span id = "L450" class = "LineNr" > 450 < / span > < span class = "subxComment" > # return< / span >
< span id = "L451" class = "LineNr" > 451 < / span > eb/jump $keyboard-interrupt-handler:epilogue/disp8
< span id = "L452" class = "LineNr" > 452 < / span > }
< span id = "L453" class = "LineNr" > 453 < / span > < span class = "subxComment" > # if (al == 0x1d) ctrl = true, return< / span >
< span id = "L454" class = "LineNr" > 454 < / span > {
< span id = "L455" class = "LineNr" > 455 < / span > 3c/compare-al-and 0x1d/imm8
< span id = "L456" class = "LineNr" > 456 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
< span id = "L457" class = "LineNr" > 457 < / span > < span class = "subxComment" > # *ctrl = 1< / span >
< span id = "L458" class = "LineNr" > 458 < / span > c7 0/subop/copy *Keyboard-ctrl-pressed? 1/imm32
< span id = "L459" class = "LineNr" > 459 < / span > < span class = "subxComment" > # return< / span >
< span id = "L460" class = "LineNr" > 460 < / span > eb/jump $keyboard-interrupt-handler:epilogue/disp8
< span id = "L461" class = "LineNr" > 461 < / span > }
< span id = "L462" class = "LineNr" > 462 < / span > < span class = "subxH1Comment" > # - convert key to character< / span >
< span id = "L463" class = "LineNr" > 463 < / span > < span class = "subxComment" > # if (shift) use keyboard shift map< / span >
< span id = "L464" class = "LineNr" > 464 < / span > {
< span id = "L465" class = "LineNr" > 465 < / span > 81 7/subop/compare *Keyboard-shift-pressed? 0/imm32
< span id = "L466" class = "LineNr" > 466 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L467" class = "LineNr" > 467 < / span > < span class = "subxComment" > # sigils don't currently support labels inside *(eax+label)< / span >
< span id = "L468" class = "LineNr" > 468 < / span > 05/add-to-eax < span class = "SpecialChar" > < a href = 'boot.subx.html#L555' > Keyboard-shift-map< / a > < / span > /imm32
< span id = "L469" class = "LineNr" > 469 < / span > 8a/byte-> *eax 0/r32/al
< span id = "L470" class = "LineNr" > 470 < / span > eb/jump $keyboard-interrupt-handler:select-map-done/disp8
< span id = "L471" class = "LineNr" > 471 < / span > }
< span id = "L472" class = "LineNr" > 472 < / span > < span class = "subxComment" > # if (ctrl) al = *(ctrl map + al)< / span >
< span id = "L473" class = "LineNr" > 473 < / span > {
< span id = "L474" class = "LineNr" > 474 < / span > 81 7/subop/compare *Keyboard-ctrl-pressed? 0/imm32
< span id = "L475" class = "LineNr" > 475 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L476" class = "LineNr" > 476 < / span > 05/add-to-eax < span class = "SpecialChar" > < a href = 'boot.subx.html#L587' > Keyboard-ctrl-map< / a > < / span > /imm32
< span id = "L477" class = "LineNr" > 477 < / span > 8a/byte-> *eax 0/r32/al
< span id = "L478" class = "LineNr" > 478 < / span > eb/jump $keyboard-interrupt-handler:select-map-done/disp8
< span id = "L479" class = "LineNr" > 479 < / span > }
< span id = "L480" class = "LineNr" > 480 < / span > < span class = "subxComment" > # otherwise al = *(normal map + al)< / span >
< span id = "L481" class = "LineNr" > 481 < / span > 05/add-to-eax < span class = "SpecialChar" > < a href = 'boot.subx.html#L521' > Keyboard-normal-map< / a > < / span > /imm32
< span id = "L482" class = "LineNr" > 482 < / span > 8a/byte-> *eax 0/r32/al
< span id = "L483" class = "LineNr" > 483 < / span > < span class = "Constant" > $keyboard-interrupt-handler:select-map-done< / span > :
< span id = "L484" class = "LineNr" > 484 < / span > < span class = "subxH1Comment" > # - if there's no character mapping, return< / span >
< span id = "L485" class = "LineNr" > 485 < / span > {
< span id = "L486" class = "LineNr" > 486 < / span > 3c/compare-al-and 0/imm8
< span id = "L487" class = "LineNr" > 487 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L488" class = "LineNr" > 488 < / span > < span class = "subxH1Comment" > # - store al in keyboard buffer< / span >
< span id = "L489" class = "LineNr" > 489 < / span > 88/< - *ecx 0/r32/al
< span id = "L490" class = "LineNr" > 490 < / span > < span class = "subxComment" > # increment index< / span >
< span id = "L491" class = "LineNr" > 491 < / span > fe/increment-byte *< span class = "SpecialChar" > Keyboard-buffer< / span > :< a href = '108write.subx.html#L11' > write< / a >
< span id = "L492" class = "LineNr" > 492 < / span > < span class = "subxComment" > # clear top nibble of index (keyboard buffer is circular)< / span >
< span id = "L493" class = "LineNr" > 493 < / span > 80 4/subop/and-byte *< span class = "SpecialChar" > Keyboard-buffer< / span > :< a href = '108write.subx.html#L11' > write< / a > 0x0f/imm8
< span id = "L494" class = "LineNr" > 494 < / span > }
< span id = "L495" class = "LineNr" > 495 < / span > < span class = "Constant" > $keyboard-interrupt-handler:epilogue< / span > :
< span id = "L496" class = "LineNr" > 496 < / span > < span class = "subxComment" > # epilogue< / span >
< span id = "L497" class = "LineNr" > 497 < / span > 9d/pop-flags
< span id = "L498" class = "LineNr" > 498 < / span > 61/pop-all-registers
< span id = "L499" class = "LineNr" > 499 < / span > fb/enable-interrupts
< span id = "L500" class = "LineNr" > 500 < / span > cf/return-from-interrupt
< span id = "L501" class = "LineNr" > 501 < / span >
< span id = "L502" class = "LineNr" > 502 < / span > == data
< span id = "L503" class = "LineNr" > 503 < / span > Keyboard-shift-pressed?: < span class = "subxComment" > # boolean< / span >
< span id = "L504" class = "LineNr" > 504 < / span > 0/imm32
2021-05-31 17:47:05 +00:00
< span id = "L505" class = "LineNr" > 505 < / span >
2021-06-16 04:50:13 +00:00
< span id = "L506" class = "LineNr" > 506 < / span > Keyboard-ctrl-pressed?: < span class = "subxComment" > # boolean< / span >
< span id = "L507" class = "LineNr" > 507 < / span > 0/imm32
< span id = "L508" class = "LineNr" > 508 < / span >
< span id = "L509" class = "LineNr" > 509 < / span > < span class = "subxComment" > # var keyboard circular buffer< / span >
< span id = "L510" class = "LineNr" > 510 < / span > < span class = "SpecialChar" > Keyboard-buffer< / span > :< a href = '108write.subx.html#L11' > write< / a > : < span class = "subxComment" > # nibble< / span >
< span id = "L511" class = "LineNr" > 511 < / span > 0/imm32
< span id = "L512" class = "LineNr" > 512 < / span > < span class = "SpecialChar" > Keyboard-buffer< / span > :read: < span class = "subxComment" > # nibble< / span >
< span id = "L513" class = "LineNr" > 513 < / span > 0/imm32
< span id = "L514" class = "LineNr" > 514 < / span > < span class = "SpecialChar" > Keyboard-buffer< / span > :data: < span class = "subxComment" > # byte[16]< / span >
< span id = "L515" class = "LineNr" > 515 < / span > 00 00 00 00
< span id = "L516" class = "LineNr" > 516 < / span > 00 00 00 00
< span id = "L517" class = "LineNr" > 517 < / span > 00 00 00 00
< span id = "L518" class = "LineNr" > 518 < / span > 00 00 00 00
< span id = "L519" class = "LineNr" > 519 < / span >
< span id = "L520" class = "Folded" > 520 < / span > < span class = "Folded" > +-- 95 lines: # Keyboard maps for translating keys to ASCII -----------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L615" class = "LineNr" > 615 < / span >
< span id = "L616" class = "LineNr" > 616 < / span > < span class = "SpecialChar" > Video-mode-info< / span > :
< span id = "L617" class = "Folded" > 617 < / span > < span class = "Folded" > +-- 53 lines: # video mode info ---------------------------------------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L670" class = "LineNr" > 670 < / span >
< span id = "L671" class = "LineNr" > 671 < / span > < span class = "SpecialChar" > Font< / span > :
< span id = "L672" class = "Folded" > 672 < / span > < span class = "Folded" > +--236 lines: # Bitmaps for some ASCII characters (soon Unicode) ------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L908" class = "LineNr" > 908 < / span >
< span id = "L909" class = "LineNr" > 909 < / span > < span class = "subxComment" > ## Controlling IDE (ATA) hard disks< / span >
< span id = "L910" class = "LineNr" > 910 < / span > < span class = "subxComment" > # Uses 28-bit PIO mode.< / span >
< span id = "L911" class = "LineNr" > 911 < / span > < span class = "subxComment" > # Inspired by < a href = "https://colorforth.github.io/ide.html" > https://colorforth.github.io/ide.html< / a > < / span >
< span id = "L912" class = "LineNr" > 912 < / span > < span class = "subxComment" > #< / span >
< span id = "L913" class = "LineNr" > 913 < / span > < span class = "subxComment" > # Resources:< / span >
< span id = "L914" class = "LineNr" > 914 < / span > < span class = "subxComment" > # < a href = "https://wiki.osdev.org/ATA_PIO_Mode" > https://wiki.osdev.org/ATA_PIO_Mode< / a > < / span >
< span id = "L915" class = "LineNr" > 915 < / span > < span class = "subxComment" > # < a href = "https://forum.osdev.org/viewtopic.php?f=1&p=167798" > https://forum.osdev.org/viewtopic.php?f=1& p=167798< / a > < / span >
< span id = "L916" class = "LineNr" > 916 < / span > < span class = "subxComment" > # read-sector, according to < a href = "https://www.scs.stanford.edu/11wi-cs140/pintos/specs/ata-3-std.pdf" > https://www.scs.stanford.edu/11wi-cs140/pintos/specs/ata-3-std.pdf< / a > < / span >
< span id = "L917" class = "LineNr" > 917 < / span >
< span id = "L918" class = "LineNr" > 918 < / span > == data
< span id = "L919" class = "LineNr" > 919 < / span >
< span id = "L920" class = "LineNr" > 920 < / span > < span class = "subxComment" > # code disk< / span >
< span id = "L921" class = "LineNr" > 921 < / span > < span class = "subxComment" > # All ports are 8-bit except data-port, which is 16-bit.< / span >
< span id = "L922" class = "LineNr" > 922 < / span > < span class = "SpecialChar" > Primary-bus-primary-drive< / span > :
< span id = "L923" class = "LineNr" > 923 < / span > < span class = "subxComment" > # command-port: int (write)< / span >
< span id = "L924" class = "LineNr" > 924 < / span > 0x1f7/imm32
< span id = "L925" class = "LineNr" > 925 < / span > < span class = "subxComment" > # status-port: int (read)< / span >
< span id = "L926" class = "LineNr" > 926 < / span > 0x1f7/imm32
< span id = "L927" class = "LineNr" > 927 < / span > < span class = "subxComment" > # alternative-status-port: int (read)< / span >
< span id = "L928" class = "LineNr" > 928 < / span > 0x3f6/imm32
< span id = "L929" class = "LineNr" > 929 < / span > < span class = "subxComment" > # error-port: int (read)< / span >
< span id = "L930" class = "LineNr" > 930 < / span > 0x1f1/imm32
< span id = "L931" class = "LineNr" > 931 < / span > < span class = "subxComment" > # drive-and-head-port: int< / span >
< span id = "L932" class = "LineNr" > 932 < / span > 0x1f6/imm32
< span id = "L933" class = "LineNr" > 933 < / span > < span class = "subxComment" > # sector-count-port: int< / span >
< span id = "L934" class = "LineNr" > 934 < / span > 0x1f2/imm32
< span id = "L935" class = "LineNr" > 935 < / span > < span class = "subxComment" > # lba-low-port: int< / span >
< span id = "L936" class = "LineNr" > 936 < / span > 0x1f3/imm32
< span id = "L937" class = "LineNr" > 937 < / span > < span class = "subxComment" > # lba-mid-port: int< / span >
< span id = "L938" class = "LineNr" > 938 < / span > 0x1f4/imm32
< span id = "L939" class = "LineNr" > 939 < / span > < span class = "subxComment" > # lba-high-port: int< / span >
< span id = "L940" class = "LineNr" > 940 < / span > 0x1f5/imm32
< span id = "L941" class = "LineNr" > 941 < / span > < span class = "subxComment" > # data-port: int< / span >
< span id = "L942" class = "LineNr" > 942 < / span > 0x1f0/imm32
< span id = "L943" class = "LineNr" > 943 < / span > < span class = "subxComment" > # drive-code: byte # only drive-specific field< / span >
< span id = "L944" class = "LineNr" > 944 < / span > 0xe0/imm32 < span class = "subxComment" > # LBA mode also enabled< / span >
< span id = "L945" class = "LineNr" > 945 < / span >
< span id = "L946" class = "LineNr" > 946 < / span > < span class = "subxComment" > # data disk< / span >
< span id = "L947" class = "LineNr" > 947 < / span > < span class = "subxComment" > # All ports are 8-bit except data-port, which is 16-bit.< / span >
< span id = "L948" class = "LineNr" > 948 < / span > < span class = "SpecialChar" > Primary-bus-secondary-drive< / span > :
< span id = "L949" class = "LineNr" > 949 < / span > < span class = "subxComment" > # command-port: int (write)< / span >
< span id = "L950" class = "LineNr" > 950 < / span > 0x1f7/imm32
< span id = "L951" class = "LineNr" > 951 < / span > < span class = "subxComment" > # status-port: int (read)< / span >
< span id = "L952" class = "LineNr" > 952 < / span > 0x1f7/imm32
< span id = "L953" class = "LineNr" > 953 < / span > < span class = "subxComment" > # alternative-status-port: int (read)< / span >
< span id = "L954" class = "LineNr" > 954 < / span > 0x3f6/imm32
< span id = "L955" class = "LineNr" > 955 < / span > < span class = "subxComment" > # error-port: int (read)< / span >
< span id = "L956" class = "LineNr" > 956 < / span > 0x1f1/imm32
< span id = "L957" class = "LineNr" > 957 < / span > < span class = "subxComment" > # drive-and-head-port: int< / span >
< span id = "L958" class = "LineNr" > 958 < / span > 0x1f6/imm32
< span id = "L959" class = "LineNr" > 959 < / span > < span class = "subxComment" > # sector-count-port: int< / span >
< span id = "L960" class = "LineNr" > 960 < / span > 0x1f2/imm32
< span id = "L961" class = "LineNr" > 961 < / span > < span class = "subxComment" > # lba-low-port: int< / span >
< span id = "L962" class = "LineNr" > 962 < / span > 0x1f3/imm32
< span id = "L963" class = "LineNr" > 963 < / span > < span class = "subxComment" > # lba-mid-port: int< / span >
< span id = "L964" class = "LineNr" > 964 < / span > 0x1f4/imm32
< span id = "L965" class = "LineNr" > 965 < / span > < span class = "subxComment" > # lba-high-port: int< / span >
< span id = "L966" class = "LineNr" > 966 < / span > 0x1f5/imm32
< span id = "L967" class = "LineNr" > 967 < / span > < span class = "subxComment" > # data-port: int< / span >
< span id = "L968" class = "LineNr" > 968 < / span > 0x1f0/imm32
< span id = "L969" class = "LineNr" > 969 < / span > < span class = "subxComment" > # drive-code: byte # only drive-specific field< / span >
< span id = "L970" class = "LineNr" > 970 < / span > 0xf0/imm32 < span class = "subxComment" > # LBA mode also enabled< / span >
< span id = "L971" class = "LineNr" > 971 < / span >
< span id = "L972" class = "LineNr" > 972 < / span > == code
< span id = "L973" class = "LineNr" > 973 < / span >
< span id = "L974" class = "LineNr" > 974 < / span > < span class = "subxFunction" > load-sectors< / span > : < span class = "subxComment" > # disk: (addr disk), lba: int, n: int, out: (addr stream byte)< / span >
< span id = "L975" class = "LineNr" > 975 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L976" class = "LineNr" > 976 < / span > 55/push-ebp
< span id = "L977" class = "LineNr" > 977 < / span > 89/< - %ebp 4/r32/esp
< span id = "L978" class = "LineNr" > 978 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L979" class = "LineNr" > 979 < / span > 50/push-eax
< span id = "L980" class = "LineNr" > 980 < / span > 51/push-ecx
< span id = "L981" class = "LineNr" > 981 < / span > 52/push-edx
< span id = "L982" class = "LineNr" > 982 < / span > < span class = "subxComment" > # check for drive< / span >
< span id = "L983" class = "LineNr" > 983 < / span > (< a href = 'boot.subx.html#L1146' > drive-exists?< / a > *(ebp+8)) < span class = "subxComment" > # => eax< / span >
< span id = "L984" class = "LineNr" > 984 < / span > 3d/compare-eax-and 0/imm32/false
< span id = "L985" class = "LineNr" > 985 < / span > 0f 84/jump-if-= $load-sectors:end/disp32
< span id = "L986" class = "LineNr" > 986 < / span > < span class = "subxComment" > # kick off read< / span >
< span id = "L987" class = "LineNr" > 987 < / span > (< a href = 'boot.subx.html#L1210' > ata-drive-select< / a > *(ebp+8) *(ebp+0xc))
< span id = "L988" class = "LineNr" > 988 < / span > (< a href = 'boot.subx.html#L1239' > clear-ata-error< / a > *(ebp+8))
< span id = "L989" class = "LineNr" > 989 < / span > (< a href = 'boot.subx.html#L1261' > ata-sector-count< / a > *(ebp+8) *(ebp+0x10))
< span id = "L990" class = "LineNr" > 990 < / span > (< a href = 'boot.subx.html#L1283' > ata-lba< / a > *(ebp+8) *(ebp+0xc))
< span id = "L991" class = "LineNr" > 991 < / span > (< a href = 'boot.subx.html#L1314' > ata-command< / a > *(ebp+8) 0x20) < span class = "subxComment" > # read sectors with retries< / span >
< span id = "L992" class = "LineNr" > 992 < / span > < span class = "subxComment" > # for each sector< / span >
< span id = "L993" class = "LineNr" > 993 < / span > {
< span id = "L994" class = "LineNr" > 994 < / span > < span class = "subxComment" > # poll for results< / span >
< span id = "L995" class = "LineNr" > 995 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " waiting for sector.." 7 0)< / span >
< span id = "L996" class = "LineNr" > 996 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " ." 7 0)< / span >
< span id = "L997" class = "LineNr" > 997 < / span > (< a href = 'boot.subx.html#L1336' > while-ata-busy< / a > *(ebp+8))
< span id = "L998" class = "LineNr" > 998 < / span > (< a href = 'boot.subx.html#L1355' > until-ata-data-available< / a > *(ebp+8))
< span id = "L999" class = "LineNr" > 999 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " reading\n" 7 0)< / span >
< span id = "L1000" class = "LineNr" > 1000 < / span > < span class = "subxComment" > # var data-port/edx = disk-> data-port< / span >
< span id = "L1001" class = "LineNr" > 1001 < / span > 8b/-> *(ebp+8) 0/r32/eax
< span id = "L1002" class = "LineNr" > 1002 < / span > 8b/-> *(eax+0x24) 2/r32/edx
< span id = "L1003" class = "LineNr" > 1003 < / span > < span class = "subxComment" > # emit results< / span >
< span id = "L1004" class = "LineNr" > 1004 < / span > 31/xor %eax 0/r32/eax
< span id = "L1005" class = "LineNr" > 1005 < / span > b9/copy-to-ecx 0x200/imm32 < span class = "subxComment" > # 512 bytes per sector< / span >
< span id = "L1006" class = "LineNr" > 1006 < / span > {
< span id = "L1007" class = "LineNr" > 1007 < / span > 81 7/subop/compare %ecx 0/imm32
< span id = "L1008" class = "LineNr" > 1008 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L1009" class = "LineNr" > 1009 < / span > 66 ed/read-port-dx-into-ax
< span id = "L1010" class = "LineNr" > 1010 < / span > < span class = "subxComment" > # write 2 bytes to stream one at a time< / span >
< span id = "L1011" class = "LineNr" > 1011 < / span > (< a href = '115write-byte.subx.html#L12' > append-byte< / a > *(ebp+0x14) %eax)
< span id = "L1012" class = "LineNr" > 1012 < / span > 49/decrement-ecx
< span id = "L1013" class = "LineNr" > 1013 < / span > c1/shift 5/subop/right-padding-zeroes %eax 8/imm8
< span id = "L1014" class = "LineNr" > 1014 < / span > (< a href = '115write-byte.subx.html#L12' > append-byte< / a > *(ebp+0x14) %eax)
< span id = "L1015" class = "LineNr" > 1015 < / span > 49/decrement-ecx
< span id = "L1016" class = "LineNr" > 1016 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L1017" class = "LineNr" > 1017 < / span > }
< span id = "L1018" class = "LineNr" > 1018 < / span > < span class = "subxComment" > # next sector< / span >
< span id = "L1019" class = "LineNr" > 1019 < / span > ff 1/subop/decrement *(ebp+0x10)
< span id = "L1020" class = "LineNr" > 1020 < / span > < span class = "CommentedCode" > #? (draw-int32-decimal-wrapping-right-then-down-from-cursor-over-full-screen 0 *(ebp+0x10) 0xc 0)< / span >
< span id = "L1021" class = "LineNr" > 1021 < / span > 81 7/subop/compare *(ebp+0x10) 0/imm32
< span id = "L1022" class = "LineNr" > 1022 < / span > 7e/jump-if-< = < span class = "Constant" > break< / span > /disp8
< span id = "L1023" class = "LineNr" > 1023 < / span > (< a href = 'boot.subx.html#L1379' > wait-400ns< / a > *(ebp+8))
< span id = "L1024" class = "LineNr" > 1024 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " next sector\n" 7 0)< / span >
< span id = "L1025" class = "LineNr" > 1025 < / span > e9/jump < span class = "Constant" > loop< / span > /disp32
< span id = "L1026" class = "LineNr" > 1026 < / span > }
< span id = "L1027" class = "LineNr" > 1027 < / span > < span class = "Constant" > $load-sectors:end< / span > :
< span id = "L1028" class = "LineNr" > 1028 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L1029" class = "LineNr" > 1029 < / span > 5a/pop-to-edx
< span id = "L1030" class = "LineNr" > 1030 < / span > 59/pop-to-ecx
< span id = "L1031" class = "LineNr" > 1031 < / span > 58/pop-to-eax
< span id = "L1032" class = "LineNr" > 1032 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L1033" class = "LineNr" > 1033 < / span > 89/< - %esp 5/r32/ebp
< span id = "L1034" class = "LineNr" > 1034 < / span > 5d/pop-to-ebp
< span id = "L1035" class = "LineNr" > 1035 < / span > c3/return
< span id = "L1036" class = "LineNr" > 1036 < / span >
< span id = "L1037" class = "LineNr" > 1037 < / span > < span class = "subxFunction" > store-sectors< / span > : < span class = "subxComment" > # disk: (addr disk), lba: int, n: int, in: (addr stream byte)< / span >
< span id = "L1038" class = "LineNr" > 1038 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L1039" class = "LineNr" > 1039 < / span > 55/push-ebp
< span id = "L1040" class = "LineNr" > 1040 < / span > 89/< - %ebp 4/r32/esp
< span id = "L1041" class = "LineNr" > 1041 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L1042" class = "LineNr" > 1042 < / span > 50/push-eax
< span id = "L1043" class = "LineNr" > 1043 < / span > 51/push-ecx
< span id = "L1044" class = "LineNr" > 1044 < / span > 52/push-edx
< span id = "L1045" class = "LineNr" > 1045 < / span > 53/push-ebx
< span id = "L1046" class = "LineNr" > 1046 < / span > < span class = "subxComment" > # check for drive< / span >
< span id = "L1047" class = "LineNr" > 1047 < / span > (< a href = 'boot.subx.html#L1146' > drive-exists?< / a > *(ebp+8)) < span class = "subxComment" > # => eax< / span >
< span id = "L1048" class = "LineNr" > 1048 < / span > 3d/compare-eax-and 0/imm32/false
< span id = "L1049" class = "LineNr" > 1049 < / span > 0f 84/jump-if-= $store-sectors:end/disp32
< span id = "L1050" class = "LineNr" > 1050 < / span > < span class = "subxComment" > # kick off write< / span >
< span id = "L1051" class = "LineNr" > 1051 < / span > (< a href = 'boot.subx.html#L1210' > ata-drive-select< / a > *(ebp+8) *(ebp+0xc))
< span id = "L1052" class = "LineNr" > 1052 < / span > (< a href = 'boot.subx.html#L1239' > clear-ata-error< / a > *(ebp+8))
< span id = "L1053" class = "LineNr" > 1053 < / span > (< a href = 'boot.subx.html#L1261' > ata-sector-count< / a > *(ebp+8) *(ebp+0x10))
< span id = "L1054" class = "LineNr" > 1054 < / span > (< a href = 'boot.subx.html#L1283' > ata-lba< / a > *(ebp+8) *(ebp+0xc))
< span id = "L1055" class = "LineNr" > 1055 < / span > (< a href = 'boot.subx.html#L1314' > ata-command< / a > *(ebp+8) 0x30) < span class = "subxComment" > # write sectors with retries< / span >
< span id = "L1056" class = "LineNr" > 1056 < / span > < span class = "subxComment" > # for each sector< / span >
< span id = "L1057" class = "LineNr" > 1057 < / span > < span class = "CommentedCode" > #? (set-cursor-position 0 0 0)< / span >
< span id = "L1058" class = "LineNr" > 1058 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " 0" 7 0)< / span >
< span id = "L1059" class = "LineNr" > 1059 < / span > {
< span id = "L1060" class = "LineNr" > 1060 < / span > < span class = "subxComment" > # wait< / span >
< span id = "L1061" class = "LineNr" > 1061 < / span > (< a href = 'boot.subx.html#L1336' > while-ata-busy< / a > *(ebp+8))
< span id = "L1062" class = "LineNr" > 1062 < / span > (< a href = 'boot.subx.html#L1374' > until-ata-ready-for-data< / a > *(ebp+8))
< span id = "L1063" class = "LineNr" > 1063 < / span > < span class = "subxComment" > # var data-port/edx = disk-> data-port< / span >
< span id = "L1064" class = "LineNr" > 1064 < / span > 8b/-> *(ebp+8) 0/r32/eax
< span id = "L1065" class = "LineNr" > 1065 < / span > 8b/-> *(eax+0x24) 2/r32/edx
< span id = "L1066" class = "LineNr" > 1066 < / span > < span class = "subxComment" > # send data< / span >
< span id = "L1067" class = "LineNr" > 1067 < / span > b9/copy-to-ecx 0x200/imm32 < span class = "subxComment" > # 512 bytes per sector< / span >
< span id = "L1068" class = "LineNr" > 1068 < / span > < span class = "subxS1Comment" > # . var first-byte/ebx: byte< / span >
< span id = "L1069" class = "LineNr" > 1069 < / span > < span class = "subxS1Comment" > # . when it's more than 0xff, we're at an even-numbered byte< / span >
< span id = "L1070" class = "LineNr" > 1070 < / span > bb/copy-to-ebx 0xffff/imm32
< span id = "L1071" class = "LineNr" > 1071 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " D" 7 0)< / span >
< span id = "L1072" class = "LineNr" > 1072 < / span > < span class = "Constant" > $store-sectors:store-sector< / span > :
< span id = "L1073" class = "LineNr" > 1073 < / span > {
< span id = "L1074" class = "LineNr" > 1074 < / span > 81 7/subop/compare %ecx 0/imm32
< span id = "L1075" class = "LineNr" > 1075 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L1076" class = "LineNr" > 1076 < / span > < span class = "subxComment" > # this loop is slow, but the ATA spec also requires a small delay< / span >
< span id = "L1077" class = "LineNr" > 1077 < / span > (< a href = '309stream.subx.html#L6' > stream-empty?< / a > *(ebp+0x14)) < span class = "subxComment" > # => eax< / span >
< span id = "L1078" class = "LineNr" > 1078 < / span > 3d/compare-eax-and 0/imm32/false
< span id = "L1079" class = "LineNr" > 1079 < / span > 75/jump-if-!= < span class = "Constant" > break< / span > /disp8
< span id = "L1080" class = "LineNr" > 1080 < / span > < span class = "subxComment" > # read byte from stream< / span >
< span id = "L1081" class = "LineNr" > 1081 < / span > (< a href = '112read-byte.subx.html#L13' > read-byte< / a > *(ebp+0x14)) < span class = "subxComment" > # => eax< / span >
< span id = "L1082" class = "LineNr" > 1082 < / span > < span class = "subxComment" > # if we're at an odd-numbered byte, save it to first-byte< / span >
< span id = "L1083" class = "LineNr" > 1083 < / span > 81 7/subop/compare %ebx 0xff/imm32
< span id = "L1084" class = "LineNr" > 1084 < / span > {
< span id = "L1085" class = "LineNr" > 1085 < / span > 7e/jump-if-< = < span class = "Constant" > break< / span > /disp8
< span id = "L1086" class = "LineNr" > 1086 < / span > 89/< - %ebx 0/r32/eax
< span id = "L1087" class = "LineNr" > 1087 < / span > eb/jump $store-sectors:store-sector/disp8
< span id = "L1088" class = "LineNr" > 1088 < / span > }
< span id = "L1089" class = "LineNr" > 1089 < / span > < span class = "subxComment" > # otherwise OR it with first-byte and write it out< / span >
< span id = "L1090" class = "LineNr" > 1090 < / span > c1/shift 4/subop/left %eax 8/imm8
< span id = "L1091" class = "LineNr" > 1091 < / span > 09/or %eax 3/r32/ebx
< span id = "L1092" class = "LineNr" > 1092 < / span > 66 ef/write-ax-into-port-dx
2021-05-31 17:47:05 +00:00
< span id = "L1093" class = "LineNr" > 1093 < / span > 49/decrement-ecx
2021-06-16 04:50:13 +00:00
< span id = "L1094" class = "LineNr" > 1094 < / span > 49/decrement-ecx
< span id = "L1095" class = "LineNr" > 1095 < / span > < span class = "subxComment" > # reset first-byte< / span >
< span id = "L1096" class = "LineNr" > 1096 < / span > bb/copy-to-ebx 0xffff/imm32
< span id = "L1097" class = "LineNr" > 1097 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L1098" class = "LineNr" > 1098 < / span > }
< span id = "L1099" class = "LineNr" > 1099 < / span > < span class = "subxComment" > # write out final first-byte if necessary< / span >
< span id = "L1100" class = "LineNr" > 1100 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " I" 7 0)< / span >
< span id = "L1101" class = "LineNr" > 1101 < / span > 81 7/subop/compare %ebx 0xff/imm32
< span id = "L1102" class = "LineNr" > 1102 < / span > {
< span id = "L1103" class = "LineNr" > 1103 < / span > 7f/jump-if-> < span class = "Constant" > break< / span > /disp8
< span id = "L1104" class = "LineNr" > 1104 < / span > 89/< - %eax 3/r32/ebx
< span id = "L1105" class = "LineNr" > 1105 < / span > 66 ef/write-ax-into-port-dx
< span id = "L1106" class = "LineNr" > 1106 < / span > 49/decrement-ecx
< span id = "L1107" class = "LineNr" > 1107 < / span > 49/decrement-ecx
< span id = "L1108" class = "LineNr" > 1108 < / span > }
< span id = "L1109" class = "LineNr" > 1109 < / span > < span class = "subxComment" > # pad zeroes< / span >
< span id = "L1110" class = "LineNr" > 1110 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " P" 7 0)< / span >
< span id = "L1111" class = "LineNr" > 1111 < / span > 31/xor %eax 0/r32/eax
< span id = "L1112" class = "LineNr" > 1112 < / span > {
< span id = "L1113" class = "LineNr" > 1113 < / span > 81 7/subop/compare %ecx 0/imm32
< span id = "L1114" class = "LineNr" > 1114 < / span > 74/jump-if-= < span class = "Constant" > break< / span > /disp8
< span id = "L1115" class = "LineNr" > 1115 < / span > 66 ef/write-ax-into-port-dx
< span id = "L1116" class = "LineNr" > 1116 < / span > 49/decrement-ecx
< span id = "L1117" class = "LineNr" > 1117 < / span > 49/decrement-ecx
< span id = "L1118" class = "LineNr" > 1118 < / span > eb/jump < span class = "Constant" > loop< / span > /disp8
< span id = "L1119" class = "LineNr" > 1119 < / span > }
< span id = "L1120" class = "LineNr" > 1120 < / span > < span class = "subxComment" > # next sector< / span >
< span id = "L1121" class = "LineNr" > 1121 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " N" 7 0)< / span >
< span id = "L1122" class = "LineNr" > 1122 < / span > ff 1/subop/decrement *(ebp+0x10)
< span id = "L1123" class = "LineNr" > 1123 < / span > 81 7/subop/compare *(ebp+0x10) 0/imm32
< span id = "L1124" class = "LineNr" > 1124 < / span > 7e/jump-if-< = < span class = "Constant" > break< / span > /disp8
< span id = "L1125" class = "LineNr" > 1125 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " W" 7 0)< / span >
< span id = "L1126" class = "LineNr" > 1126 < / span > (< a href = 'boot.subx.html#L1379' > wait-400ns< / a > *(ebp+8))
< span id = "L1127" class = "LineNr" > 1127 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " L" 7 0)< / span >
< span id = "L1128" class = "LineNr" > 1128 < / span > e9/jump < span class = "Constant" > loop< / span > /disp32
< span id = "L1129" class = "LineNr" > 1129 < / span > }
< span id = "L1130" class = "LineNr" > 1130 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " F" 7 0)< / span >
< span id = "L1131" class = "LineNr" > 1131 < / span > (< a href = 'boot.subx.html#L1413' > flush-ata-cache< / a > *(ebp+8))
< span id = "L1132" class = "LineNr" > 1132 < / span > < span class = "CommentedCode" > #? (draw-text-wrapping-right-then-down-from-cursor-over-full-screen 0 " Y" 7 0)< / span >
< span id = "L1133" class = "LineNr" > 1133 < / span > < span class = "Constant" > $store-sectors:end< / span > :
< span id = "L1134" class = "LineNr" > 1134 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L1135" class = "LineNr" > 1135 < / span > 5b/pop-to-ebx
< span id = "L1136" class = "LineNr" > 1136 < / span > 5a/pop-to-edx
< span id = "L1137" class = "LineNr" > 1137 < / span > 59/pop-to-ecx
< span id = "L1138" class = "LineNr" > 1138 < / span > 58/pop-to-eax
< span id = "L1139" class = "LineNr" > 1139 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L1140" class = "LineNr" > 1140 < / span > 89/< - %esp 5/r32/ebp
< span id = "L1141" class = "LineNr" > 1141 < / span > 5d/pop-to-ebp
< span id = "L1142" class = "LineNr" > 1142 < / span > c3/return
< span id = "L1143" class = "LineNr" > 1143 < / span >
< span id = "L1144" class = "Folded" > 1144 < / span > < span class = "Folded" > +--289 lines: # disk helpers ------------------------------------------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L1433" class = "LineNr" > 1433 < / span >
< span id = "L1434" class = "LineNr" > 1434 < / span > < span class = "subxComment" > ## Controlling a PS/2 mouse< / span >
< span id = "L1435" class = "LineNr" > 1435 < / span > < span class = "subxComment" > # Uses no IRQs, just polling.< / span >
< span id = "L1436" class = "LineNr" > 1436 < / span > < span class = "subxComment" > # Thanks Dave Long: < a href = "https://github.com/jtauber/cleese/blob/master/necco/kernel/bochs/py8042.py" > https://github.com/jtauber/cleese/blob/master/necco/kernel/bochs/py8042.py< / a > < / span >
< span id = "L1437" class = "LineNr" > 1437 < / span > < span class = "subxComment" > #< / span >
< span id = "L1438" class = "LineNr" > 1438 < / span > < span class = "subxComment" > # Resources:< / span >
< span id = "L1439" class = "LineNr" > 1439 < / span > < span class = "subxComment" > # < a href = "https://wiki.osdev.org/Mouse_Input" > https://wiki.osdev.org/Mouse_Input< / a > < / span >
< span id = "L1440" class = "LineNr" > 1440 < / span >
< span id = "L1441" class = "LineNr" > 1441 < / span > < span class = "subxComment" > # results x/eax, y/ecx range from -256 to +255< / span >
< span id = "L1442" class = "LineNr" > 1442 < / span > < span class = "subxComment" > # See < a href = "https://wiki.osdev.org/index.php?title=Mouse_Input&oldid=25663#Format_of_First_3_Packet_Bytes" > https://wiki.osdev.org/index.php?title=Mouse_Input& oldid=25663#Format_of_First_3_Packet_Bytes< / a > < / span >
< span id = "L1443" class = "LineNr" > 1443 < / span > < span class = "subxFunction" > read-mouse-event< / span > : < span class = "subxComment" > # -> _/eax: int, _/ecx: int< / span >
< span id = "L1444" class = "LineNr" > 1444 < / span > < span class = "subxS1Comment" > # . prologue< / span >
< span id = "L1445" class = "LineNr" > 1445 < / span > 55/push-ebp
< span id = "L1446" class = "LineNr" > 1446 < / span > 89/< - %ebp 4/r32/esp
< span id = "L1447" class = "LineNr" > 1447 < / span > < span class = "subxS1Comment" > # . save registers< / span >
< span id = "L1448" class = "LineNr" > 1448 < / span > 52/push-edx
< span id = "L1449" class = "LineNr" > 1449 < / span > 53/push-ebx
< span id = "L1450" class = "LineNr" > 1450 < / span > < span class = "subxComment" > # if no event, return 0, 0< / span >
< span id = "L1451" class = "LineNr" > 1451 < / span > b8/copy-to-eax 0/imm32
< span id = "L1452" class = "LineNr" > 1452 < / span > b9/copy-to-ecx 0/imm32
< span id = "L1453" class = "LineNr" > 1453 < / span > (< a href = 'boot.subx.html#L1510' > any-mouse-event?< / a > ) < span class = "subxComment" > # => eax< / span >
< span id = "L1454" class = "LineNr" > 1454 < / span > 3d/compare-eax-and 0/imm32/false
< span id = "L1455" class = "LineNr" > 1455 < / span > 74/jump-if-= $read-mouse-event:end/disp8
< span id = "L1456" class = "LineNr" > 1456 < / span > < span class = "subxComment" > # var f1/edx: byte = inb(0x60)< / span >
< span id = "L1457" class = "LineNr" > 1457 < / span > 31/xor %eax 0/r32/eax
< span id = "L1458" class = "LineNr" > 1458 < / span > e4/read-port-into-al 0x60/imm8
< span id = "L1459" class = "LineNr" > 1459 < / span > 89/< - %edx 0/r32/eax
< span id = "L1460" class = "LineNr" > 1460 < / span > (< a href = 'boot.subx.html#L1495' > wait-for-mouse-event< / a > )
< span id = "L1461" class = "LineNr" > 1461 < / span > < span class = "subxComment" > # var dx/ebx: byte = inb(0x60)< / span >
< span id = "L1462" class = "LineNr" > 1462 < / span > 31/xor %eax 0/r32/eax
< span id = "L1463" class = "LineNr" > 1463 < / span > e4/read-port-into-al 0x60/imm8
< span id = "L1464" class = "LineNr" > 1464 < / span > 89/< - %ebx 0/r32/eax
< span id = "L1465" class = "LineNr" > 1465 < / span > (< a href = 'boot.subx.html#L1495' > wait-for-mouse-event< / a > )
< span id = "L1466" class = "LineNr" > 1466 < / span > < span class = "subxComment" > # var dy/ecx: byte = inb(0x60)< / span >
< span id = "L1467" class = "LineNr" > 1467 < / span > 31/xor %eax 0/r32/eax
< span id = "L1468" class = "LineNr" > 1468 < / span > e4/read-port-into-al 0x60/imm8
< span id = "L1469" class = "LineNr" > 1469 < / span > 89/< - %ecx 0/r32/eax
< span id = "L1470" class = "LineNr" > 1470 < / span > < span class = "subxComment" > # eax = dx< / span >
< span id = "L1471" class = "LineNr" > 1471 < / span > 89/< - %eax 3/r32/ebx
< span id = "L1472" class = "LineNr" > 1472 < / span > < span class = "subxComment" > # if (f1 & 0x10) dx = -dx< / span >
< span id = "L1473" class = "LineNr" > 1473 < / span > {
< span id = "L1474" class = "LineNr" > 1474 < / span > f6 0/subop/test-bits %dl 0x10/imm8
< span id = "L1475" class = "LineNr" > 1475 < / span > 74/jump-if-zero < span class = "Constant" > break< / span > /disp8
< span id = "L1476" class = "LineNr" > 1476 < / span > 0d/or-eax-with 0xffffff00/imm32
< span id = "L1477" class = "LineNr" > 1477 < / span > }
< span id = "L1478" class = "LineNr" > 1478 < / span > < span class = "subxComment" > # if (f1 & 0x20) dy = -dy< / span >
< span id = "L1479" class = "LineNr" > 1479 < / span > {
< span id = "L1480" class = "LineNr" > 1480 < / span > f6 0/subop/test-bits %dl 0x20/imm8
< span id = "L1481" class = "LineNr" > 1481 < / span > 74/jump-if-zero < span class = "Constant" > break< / span > /disp8
< span id = "L1482" class = "LineNr" > 1482 < / span > 81 1/subop/or %ecx 0xffffff00/imm32
< span id = "L1483" class = "LineNr" > 1483 < / span > }
< span id = "L1484" class = "LineNr" > 1484 < / span > < span class = "Constant" > $read-mouse-event:end< / span > :
< span id = "L1485" class = "LineNr" > 1485 < / span > < span class = "subxS1Comment" > # . restore registers< / span >
< span id = "L1486" class = "LineNr" > 1486 < / span > 5b/pop-to-ebx
< span id = "L1487" class = "LineNr" > 1487 < / span > 5a/pop-to-edx
< span id = "L1488" class = "LineNr" > 1488 < / span > < span class = "subxS1Comment" > # . epilogue< / span >
< span id = "L1489" class = "LineNr" > 1489 < / span > 89/< - %esp 5/r32/ebp
< span id = "L1490" class = "LineNr" > 1490 < / span > 5d/pop-to-ebp
< span id = "L1491" class = "LineNr" > 1491 < / span > c3/return
< span id = "L1492" class = "LineNr" > 1492 < / span >
< span id = "L1493" class = "Folded" > 1493 < / span > < span class = "Folded" > +--147 lines: # mouse helpers -----------------------------------------------------------------------------------------------------------------------------------------------------------< / span >
< span id = "L1640" class = "LineNr" > 1640 < / span >
< span id = "L1641" class = "LineNr" > 1641 < / span > < span class = "subxComment" > # vim: ft=subx< / span >
2021-03-24 00:31:08 +00:00
< / pre >
< / body >
< / html >
<!-- vim: set foldmethod=manual : -->