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| author | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 21:22:30 -0700 |
|---|---|---|
| committer | Kartik K. Agaram <vc@akkartik.com> | 2021-03-15 21:22:30 -0700 |
| commit | bc182ae559580d4d2cde6d5c5e8ed3bb5906bdb5 (patch) | |
| tree | 3c193bf6d292ab34ffac46acf1cbc36a73371429 /boot.subx | |
| parent | 341f0c59be23e5eabee50b43608a64ebf75fd053 (diff) | |
| download | mu-bc182ae559580d4d2cde6d5c5e8ed3bb5906bdb5.tar.gz | |
boot.subx is now clean SubX
Diffstat (limited to 'boot.subx')
| -rw-r--r-- | boot.subx | 16 |
1 files changed, 3 insertions, 13 deletions
diff --git a/boot.subx b/boot.subx index 369ed975..412940d6 100644 --- a/boot.subx +++ b/boot.subx @@ -134,11 +134,7 @@ 0f 01/lgdt 2/subop/lgdt 0/mod/indirect 6/rm32/use-disp16 0x7cf8/disp16/gdt_descriptor # enable paging 0f 20/<-cr 3/mod/direct 0/rm32/eax 0/r32/cr0 -== data - # TODO: SubX doesn't understand 66 prefix -#? 66 83/or 3/mod/direct 0/rm32/eax 1/r32/?? 1/imm8 # eax <- or 0x1 - 66 83 c8 01 # eax <- or 0x1 -== code + 66 83/or 3/mod/direct 0/rm32/eax 1/r32/?? 1/imm8 # eax <- or 0x1 0f 22/->cr 3/mod/direct 0/rm32/eax 0/r32/cr0 # far jump to initialize_32bit_mode that sets cs to offset 8 in the gdt in the process # We can't refer to the label directly because SubX doesn't have syntax for @@ -191,10 +187,7 @@ gdt_descriptor: == code 0x7d00 initialize_32bit_mode: -== data - # TODO: SubX doesn't understand 66 prefix - 66 b8 10 00 # ax <- offset 16 from gdt_start -== code + 66 b8/copy-to-ax 0x10/imm16 # offset 16 from gdt_start 8e/->seg 3/mod/direct 0/rm32/ax 3/r32/ds 8e/->seg 3/mod/direct 0/rm32/ax 2/r32/ss 8e/->seg 3/mod/direct 0/rm32/ax 0/r32/es @@ -223,10 +216,7 @@ initialize_32bit_mode: e6/write-al-into-port 0x21/imm8 fb/enable-interrupts -== data - # TODO: SubX doesn't understand db prefix - db e3/initialize-floating-point-coprocessor -== code + db/floating-point-coprocessor e3/initialize # eax <- cr4 0f 20/<-cr 3/mod/direct 0/rm32/eax 4/r32/cr4 # eax <- or bit 9 |