reintroduce Entry label

boot.subx

@@ -19,12 +19,9 @@
 #     see 120allocate.subx
 # Consult https://wiki.osdev.org/Memory_Map_(x86) before modifying any of this.
 
-# Magic addresses (TODO):
-#   0x9400: entrypoint for applications
-
 == code
 
-## 16-bit entry point
+## 16-bit entry point: 0x7c00
 
 # Upon reset, the IBM PC:
 #   - loads the first sector (512 bytes)
@@ -236,9 +233,7 @@ initialize_32bit_mode:
   0f ba/bit-test 5/subop/bit-test-and-set 3/mod/direct 0/rm32/eax 9/imm8
   # cr4 <- eax
   0f 22/->cr 3/mod/direct 0/rm32/eax 4/r32/cr4
-== data
-  e9 d0 16 00 00  # jump to 0x9400 [label]
-== code
+  e9/jump Entry/disp32
 
 == boot-sector-marker 0x7dfe
 # final 2 bytes of boot sector

ex1.subx

@@ -4,7 +4,7 @@
 # graphics mode.
 #
 # To build a disk image:
-#   ./translate_subx boot.subx ex2.subx   # emits disk.img
+#   ./translate_subx boot.subx ex1.subx   # emits disk.img
 # To run:
 #   qemu-system-i386 disk.img
 # Or:
@@ -12,7 +12,7 @@
 
 == code
 
-main:
+Entry:
   {
     eb/jump loop/disp8
   }

ex2.subx

@@ -9,7 +9,7 @@
 
 == code
 
-main:
+Entry:
   # ecx <- start of video memory
   8b/-> *Video-memory-addr 1/r32/ecx
 

mu-init.subx

@@ -7,6 +7,7 @@
 
 == code
 
+Entry:
 # initialize stack
 bd/copy-to-ebp 0/imm32
 # always first run tests