diff options
| author | Li-Ta Lo <ollie@lanl.gov> | 2004-11-04 18:36:06 +0000 |
|---|---|---|
| committer | Li-Ta Lo <ollie@lanl.gov> | 2004-11-04 18:36:06 +0000 |
| commit | f84926efca2f871fa557cccee36f0f773ec7190b (patch) | |
| tree | 669414cbe6344aa61839f37422c0e163eae4f0fa /src/cpu | |
| parent | 1995f1af35b53b5c07694df7296f5eb20461b1c6 (diff) | |
tell people that the segment descriptors are different for ROMCC and
GCC code.
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1740 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/x86/16bit/entry16.inc | 8 | ||||
| -rw-r--r-- | src/cpu/x86/32bit/entry32.inc | 9 | ||||
| -rw-r--r-- | src/cpu/x86/lapic/secondary.S | 2 |
3 files changed, 11 insertions, 8 deletions
diff --git a/src/cpu/x86/16bit/entry16.inc b/src/cpu/x86/16bit/entry16.inc index 61726d8ad9..674315fbd2 100644 --- a/src/cpu/x86/16bit/entry16.inc +++ b/src/cpu/x86/16bit/entry16.inc @@ -108,10 +108,10 @@ _start: /* Now that we are in protected mode jump to a 32 bit code segment. */ data32 ljmp $ROM_CODE_SEG, $__protected_start -/** The gdt has a 4 Gb code segment at 0x10, and a 4 GB data segment - * at 0x18; these are Linux-compatible. - */ - + /** + * The gdt is defined in entry32.inc, it has a 4 Gb code segment + * at 0x08, and a 4 GB data segment at 0x10; + */ .align 4 .globl gdtptr16 gdtptr16: diff --git a/src/cpu/x86/32bit/entry32.inc b/src/cpu/x86/32bit/entry32.inc index 3d30a3f85f..724aed32eb 100644 --- a/src/cpu/x86/32bit/entry32.inc +++ b/src/cpu/x86/32bit/entry32.inc @@ -8,17 +8,20 @@ .align 4 .globl gdtptr + /* This is the gdt for ROMCC/ASM part of LinuxBIOS. + * It is different from the gdt in GCC part of LinuxBIOS + * which is defined in c_start.S */ gdt: gdtptr: .word gdt_end - gdt -1 /* compute the table limit */ .long gdt /* we know the offset */ .word 0 -/* flat code segment */ + /* selgdt 0x08, flat code segment */ .word 0xffff, 0x0000 .byte 0x00, 0x9b, 0xcf, 0x00 - -/* flat data segment */ + + /* selgdt 0x10,flat data segment */ .word 0xffff, 0x0000 .byte 0x00, 0x93, 0xcf, 0x00 diff --git a/src/cpu/x86/lapic/secondary.S b/src/cpu/x86/lapic/secondary.S index 5185021c3c..b212f43b38 100644 --- a/src/cpu/x86/lapic/secondary.S +++ b/src/cpu/x86/lapic/secondary.S @@ -26,7 +26,7 @@ _secondary_start: orl $0x60000001, %eax /* CD, NW, PE = 1 */ movl %eax, %cr0 - ljmpl $0x10, $1f + ljmpl $0x10, $1f 1: .code32 movw $0x18, %ax |