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tell people that the segment descriptors are different for ROMCC and

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GCC code.


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1740 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Li-Ta Lo
2004-11-04 18:36:06 +00:00
parent 1995f1af35
commit f84926efca
4 changed files with 33 additions and 29 deletions
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43
src/arch/i386/lib/c_start.S
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@@ -216,7 +216,7 @@ int_hand:
popl %ecx
popl %edx
popl %ebx
popl %ebp /* Ignore saved %esp value */
popl %ebp /* Ignore saved %esp value */
popl %ebp
popl %esi
popl %edi
@@ -241,49 +241,50 @@ gdb_stub_breakpoint:
.globl gdt, gdt_end, gdt_limit, idtarg
gdt_limit = gdt_end - gdt - 1 /* compute the table limit */
gdt_limit = gdt_end - gdt - 1 /* compute the table limit */
gdtaddr:
.word gdt_limit
.long gdt /* we know the offset */
.long gdt /* we know the offset */
.data
/* This is the gdt for GCC part of LinuxBIOS.
* It is different from the gdt in ROMCC/ASM part of LinuxBIOS
* which is defined in entry32.inc */
gdt:
// selgdt 0
/* selgdt 0, unused */
.word 0x0000, 0x0000 /* dummy */
.byte 0x00, 0x00, 0x00, 0x00
// selgdt 8
/* selgdt 8, unused */
.word 0x0000, 0x0000 /* dummy */
.byte 0x00, 0x00, 0x00, 0x00
// selgdt 0x10
/* flat code segment */
/* selgdt 0x10, flat code segment */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
//selgdt 0x18
/* flat data segment */
/* selgdt 0x18, flat data segment */
.word 0xffff, 0x0000
.byte 0x00, 0x93, 0xcf, 0x00
//selgdt 0x20
/* selgdt 0x20, unused */
.word 0x0000, 0x0000 /* dummy */
.byte 0x00, 0x00, 0x00, 0x00
#if defined(CONFIG_LEGACY_VGABIOS) && (CONFIG_LEGACY_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
/* from monty:
* 0x00009a00,0000ffffULL, 20h: 16-bit 64k code at 0x00000000
* 0x00009200,0000ffffULL 28h: 16-bit 64k data at 0x00000000 */
// selgdt 0x30
/*16-bit 64k data at 0x00000000 */
/* selgdt 0x28, 16-bit 64k code at 0x00000000 */
.word 0xffff, 0x0000
.byte 0x00, 0x9a, 0x00, 0x00
/* selgdt 0x30, 16-bit 64k data at 0x00000000 */
.word 0xffff, 0x0000
.byte 0, 0x92, 0, 0
#endif // defined(CONFIG_VGABIOS) && (CONFIG_VGABIOS == 1)
#endif /* defined(CONFIG_VGABIOS) && (CONFIG_VGABIOS == 1) */
gdt_end:
idtarg: