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First cut at running vgabios code.

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This commit is contained in:
Ronald G. Minnich 2002-03-27 04:14:40 +00:00
commit 4355f389e2
3 changed files with 116 additions and 123 deletions
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33
src/cpu/i386/entry32.inc
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@ -20,22 +20,47 @@ EXT(gdtptr):
.long gdt /* we know the offset */
gdt:
// selgdt 0
.word 0x0000, 0x0000 /* dummy */
.byte 0x00, 0x00, 0x00, 0x00
.word 0xffff, _cache_ram_seg_base_low /* flat cache ram offset data segment */
// selgdt 8
/* flat cache ram offset data segment */
.word 0xffff, _cache_ram_seg_base_low
.byte _cache_ram_seg_base_middle, 0x93, 0xcf
.byte _cache_ram_seg_base_high
.word 0xffff, 0x0000 /* flat code segment */
// selgdt 0x10
/* flat code segment */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
.word 0xffff, 0x0000 /* flat data segment */
//selgdt 0x18
/* flat data segment */
.word 0xffff, 0x0000
.byte 0x00, 0x93, 0xcf, 0x00
.word 0xffff, _rom_code_seg_base_low /* flat rom offset code segment */
//selgdt 0x20
/* flat rom offset code segment */
.word 0xffff, _rom_code_seg_base_low
.byte _rom_code_seg_base_middle, 0x9b, 0xcf
.byte _rom_code_seg_base_high
#if defined(CONFIG_VGABIOS) && (CONFIG_VGABIOS == 1)
// from monty:
/* 0x00009a00,0000ffffULL, 20h: 16-bit 64k code at 0x00000000 */
/* 0x00009200,0000ffffULL 28h: 16-bit 64k data at 0x00000000 */
// selgdt 0x28
/*16-bit 64k code at 0x00000000 */
.word 0xffff, 0x0000
.byte 0, 0x9a, 0, 0
// selgdt 0x30
/*16-bit 64k data at 0x00000000 */
.word 0xffff, 0x0000
.byte 0, 0x92, 0, 0
#endif // defined(CONFIG_VGABIOS) && (CONFIG_VGABIOS == 1)
gdt_end: