This commit is contained in:
Kartik K. Agaram
parent
7b89f8e67e
commit
55adbda2d9
257
boot.subx
257
boot.subx
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@ -133,7 +133,7 @@
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# We can't refer to the label directly because SubX doesn't do the right
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# thing for lgdt, so rather than make errors worse in most places we instead
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# pin gdt_descriptor below.
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0f 01 2/subop/lgdt 0/mod/indirect 6/rm32/use-disp16 0x7cf0/disp16/gdt_descriptor
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0f 01 2/subop/lgdt 0/mod/indirect 6/rm32/use-disp16 0x7ce0/disp16/gdt_descriptor
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# enable paging
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0f 20/<-cr 3/mod/direct 0/rm32/eax 0/r32/cr0
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66 83 1/subop/or 3/mod/direct 0/rm32/eax 1/imm8 # eax <- or 0x1
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@ -158,7 +158,10 @@ disk_error:
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}
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## GDT: 3 records of 8 bytes each
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== data
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== data 0x7ce0
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gdt_descriptor:
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0x17/imm16 # final index of gdt = size of gdt - 1
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gdt_start/imm32/start
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gdt_start:
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# offset 0: gdt_null: mandatory null descriptor
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@ -180,16 +183,6 @@ gdt_start:
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00 # base[24:32]
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# gdt_end:
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== data 0x7cf0
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gdt_descriptor:
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0x17/imm16 # final index of gdt = size of gdt - 1
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gdt_start/imm32/start
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== data 0x7cf8
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idt_descriptor:
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ff 03 # final index of idt = size of idt - 1
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idt_start/imm32/start
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## 32-bit code from this point
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== code 0x7d00
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@ -207,7 +200,7 @@ initialize_32bit_mode:
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# We can't refer to the label directly because SubX doesn't do the right
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# thing for lidt, so rather than make errors worse in most places we instead
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# pin idt_descriptor below.
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0f 01 3/subop/lidt 0/mod/indirect 5/rm32/use-disp32 0x7cf8/disp32/idt_descriptor
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0f 01 3/subop/lidt 0/mod/indirect 5/rm32/use-disp32 0x7e00/disp32/idt_descriptor
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# For now, not bothering reprogramming the IRQ to not conflict with software
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# exceptions.
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@ -242,6 +235,68 @@ initialize_32bit_mode:
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55 aa
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## sector 2 onwards loaded by load_disk, not automatically on boot
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== data 0x7e00
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idt_descriptor:
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ff 03 # final index of idt = size of idt - 1
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idt_start/imm32/start
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# interrupt descriptor table {{{
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# 32 entries of 8 bytes each
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idt_start:
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# entry 0
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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# By default, BIOS maps IRQ0-7 to interrupt vectors 8-15.
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# https://wiki.osdev.org/index.php?title=Interrupts&oldid=25102#Default_PC_Interrupt_Vector_Assignment
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# entry 8: clock
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null-interrupt-handler/imm16 # target[0:16]
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8/imm16 # segment selector (gdt_code)
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00 # unused
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8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
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0/imm16 # target[16:32] -- null-interrupt-handler must be within address 0x10000
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# entry 9: keyboard
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keyboard-interrupt-handler/imm16 # target[0:16]
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8/imm16 # segment selector (gdt_code)
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00 # unused
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8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
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0/imm16 # target[16:32] -- keyboard-interrupt-handler must be within address 0x10000
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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# idt_end:
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# }}}
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== code
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null-interrupt-handler:
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@ -384,118 +439,7 @@ Keyboard-buffer:data: # byte[16]
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00 00 00 00
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00 00 00 00
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Video-mode-info:
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# video mode info {{{
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0/imm16 # attributes
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00 # winA
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00 # winB
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# 04
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0/imm16 # granularity
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0/imm16 # winsize
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# 08
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0/imm16 # segmentA
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0/imm16 # segmentB
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# 0c
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0/imm32 # realFctPtr (who knows)
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# 10
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0/imm16 # pitch
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0/imm16 # Xres
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0/imm16 # Yres
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0/imm16 # Wchar Ychar
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# 18
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00 # planes
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00 # bpp
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00 # banks
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00 # memory_model
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# 1c
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00 # bank_size
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00 # image_pages
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00 # reserved
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# 1f
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0/imm16 # red_mask red_position
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0/imm16 # green_mask green_position
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0/imm16 # blue_mask blue_position
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0/imm16 # rsv_mask rsv_position
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00 # directcolor_attributes
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# 28
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Video-memory-addr:
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0/imm32 # physbase
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# 2c
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# reserved for video mode info
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00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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# }}}
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# interrupt descriptor table {{{
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# 32 entries of 8 bytes each
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idt_start:
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# entry 0
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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# By default, BIOS maps IRQ0-7 to interrupt vectors 8-15.
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# https://wiki.osdev.org/index.php?title=Interrupts&oldid=25102#Default_PC_Interrupt_Vector_Assignment
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# entry 8: clock
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null-interrupt-handler/imm16 # target[0:16]
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8/imm16 # segment selector (gdt_code)
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00 # unused
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8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
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0/imm16 # target[16:32] -- null-interrupt-handler must be within address 0x10000
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# entry 9: keyboard
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keyboard-interrupt-handler/imm16 # target[0:16]
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8/imm16 # segment selector (gdt_code)
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00 # unused
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8e # 1/p 00/dpl 0 1110/type/32-bit-interrupt-gate
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0/imm16 # target[16:32] -- keyboard-interrupt-handler must be within address 0x10000
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00
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# idt_end:
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# }}}
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# translating keys to ASCII {{{
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# Keyboard maps for translating keys to ASCII {{{
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Keyboard-normal-map:
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00
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# es
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@ -566,6 +510,61 @@ Keyboard-ctrl-map:
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1a 18 03 16 02 0e 0d 00 00 1f 00 00
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# }}}
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Video-mode-info:
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# video mode info {{{
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0/imm16 # attributes
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00 # winA
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00 # winB
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# 04
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0/imm16 # granularity
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0/imm16 # winsize
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# 08
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0/imm16 # segmentA
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0/imm16 # segmentB
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# 0c
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0/imm32 # realFctPtr (who knows)
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# 10
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0/imm16 # pitch
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0/imm16 # Xres
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0/imm16 # Yres
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0/imm16 # Wchar Ychar
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# 18
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00 # planes
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00 # bpp
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00 # banks
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00 # memory_model
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# 1c
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00 # bank_size
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00 # image_pages
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00 # reserved
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# 1f
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0/imm16 # red_mask red_position
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0/imm16 # green_mask green_position
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0/imm16 # blue_mask blue_position
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0/imm16 # rsv_mask rsv_position
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00 # directcolor_attributes
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# 28
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Video-memory-addr:
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0/imm32 # physbase
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# 2c
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# reserved for video mode info
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00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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# }}}
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Font:
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# Bitmaps for some ASCII characters (soon Unicode) {{{
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# Part of GNU Unifont
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@ -947,6 +946,8 @@ $store-first-sector-to-primary-bus-secondary-drive:end:
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5d/pop-to-ebp
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c3/return
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# disk helpers {{{
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secondary-drive-exists?: # -> _/eax: boolean
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# . prologue
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55/push-ebp
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@ -1185,6 +1186,8 @@ until-ata-ready-for-data:
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(until-ata-data-available)
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c3/return
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# }}}
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## Controlling a PS/2 mouse
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# Uses no IRQs, just polling.
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# Thanks Dave Long: https://github.com/jtauber/cleese/blob/master/necco/kernel/bochs/py8042.py
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@ -1244,6 +1247,8 @@ $read-mouse-event:end:
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5d/pop-to-ebp
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c3/return
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# mouse helpers {{{
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wait-for-mouse-event:
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# . save registers
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50/push-eax
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@ -1393,4 +1398,6 @@ $poll-keyboard-controller-to-read-data-port:end:
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5d/pop-to-ebp
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c3/return
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# }}}
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# vim:ft=subx
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