diff options
| author | Kartik Agaram <vc@akkartik.com> | 2020-12-26 21:04:46 -0800 |
|---|---|---|
| committer | Kartik Agaram <vc@akkartik.com> | 2020-12-26 21:04:46 -0800 |
| commit | a7ae16ed066fd86e84ea5d2f129ec641579eed1f (patch) | |
| tree | cc622ad6c764652719be5e844767668d1b0aaeea /baremetal/boot.hex | |
| parent | 63d553427882a8f5996d77509a435caba462d5f6 (diff) | |
| download | mu-a7ae16ed066fd86e84ea5d2f129ec641579eed1f.tar.gz | |
7414
Diffstat (limited to 'baremetal/boot.hex')
| -rw-r--r-- | baremetal/boot.hex | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/baremetal/boot.hex b/baremetal/boot.hex index 3f6b8a41..25c172f8 100644 --- a/baremetal/boot.hex +++ b/baremetal/boot.hex @@ -104,19 +104,21 @@ # 43: # switch to 32-bit mode 0f 01 16 # lgdt 00/mod/indirect 010/subop 110/rm/use-disp16 - 80 7c # *gdt_descriptor + a0 7c # *gdt_descriptor 0f 20 c0 # eax <- cr0 66 83 c8 01 # eax <- or 0x1 0f 22 c0 # cr0 <- eax - ea c0 7c 08 00 # far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code) + ea e0 7c 08 00 # far jump to initialize_32bit_mode after setting cs to the record at offset 8 in the gdt (gdt_code) # padding # 57: 00 00 00 00 00 00 00 00 00 +00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 +00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ## GDT: 3 records of 8 bytes each -# 60: +# 80: # gdt_start: # gdt_null: mandatory null descriptor 00 00 00 00 00 00 00 00 @@ -138,19 +140,19 @@ # gdt_end: # padding -# 78: +# 98: 00 00 00 00 00 00 00 00 -# 80: +# a0: # gdt_descriptor: 17 00 # final index of gdt = gdt_end - gdt_start - 1 - 60 7c 00 00 # start = gdt_start + 80 7c 00 00 # start = gdt_start # padding -# 85: +# a5: 00 00 00 00 00 00 00 00 00 00 -# 90: +# b0: # disk_error: # print 'D' to top-left of screen to indicate disk error # *0xb8000 <- 0x0f44 @@ -170,13 +172,13 @@ e9 fb ff # loop forever # padding -# a1: +# c1: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ## 32-bit code from this point (still some instructions not in SubX) -# c0: +# e0: # initialize_32bit_mode: 66 b8 10 00 # ax <- offset 16 from gdt_start 8e d8 # ds <- ax @@ -195,13 +197,11 @@ e9 fb ff # loop forever # initialization is done; enable interrupts fb - e9 21 03 00 00 # jump to 0x8000 + e9 01 03 00 00 # jump to 0x8000 # padding -# df: +# ff: 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 -00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 # 100: # null interrupt handler: |