diff options
| author | Eric Biederman <ebiederm@xmission.com> | 2004-10-14 19:29:29 +0000 |
|---|---|---|
| committer | Eric Biederman <ebiederm@xmission.com> | 2004-10-14 19:29:29 +0000 |
| commit | fcd5ace00b333ce31b11b02a2243dfbf39307f10 (patch) | |
| tree | d686d752ccea9b185b0008c70d8523749b26e2dd /src/cpu/x86/32bit/entry32.inc | |
| parent | 98e619b1cefcb9871185f4cc3db85fa430dcdbce (diff) | |
| download | coreboot-fcd5ace00b333ce31b11b02a2243dfbf39307f10.tar.xz | |
- Add new cvs code to cvs
git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1657 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/cpu/x86/32bit/entry32.inc')
| -rw-r--r-- | src/cpu/x86/32bit/entry32.inc | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/cpu/x86/32bit/entry32.inc b/src/cpu/x86/32bit/entry32.inc new file mode 100644 index 0000000000..3d30a3f85f --- /dev/null +++ b/src/cpu/x86/32bit/entry32.inc @@ -0,0 +1,61 @@ +/* For starting linuxBIOS in protected mode */ + +#include <arch/rom_segs.h> + +/* .section ".rom.text" */ + .code32 + + .align 4 +.globl gdtptr + +gdt: +gdtptr: + .word gdt_end - gdt -1 /* compute the table limit */ + .long gdt /* we know the offset */ + .word 0 + +/* flat code segment */ + .word 0xffff, 0x0000 + .byte 0x00, 0x9b, 0xcf, 0x00 + +/* flat data segment */ + .word 0xffff, 0x0000 + .byte 0x00, 0x93, 0xcf, 0x00 + +gdt_end: + + +/* + * When we come here we are in protected mode. We expand + * the stack and copies the data segment from ROM to the + * memory. + * + * After that, we call the chipset bootstrap routine that + * does what is left of the chipset initialization. + * + * NOTE aligned to 4 so that we are sure that the prefetch + * cache will be reloaded. + */ + .align 4 +.globl protected_start +protected_start: + + lgdt %cs:gdtptr + ljmp $ROM_CODE_SEG, $__protected_start + +__protected_start: + /* Save the BIST value */ + movl %eax, %ebp + + intel_chip_post_macro(0x10) /* post 10 */ + + movw $ROM_DATA_SEG, %ax + movw %ax, %ds + movw %ax, %es + movw %ax, %ss + movw %ax, %fs + movw %ax, %gs + + /* Restore the BIST value to %eax */ + movl %ebp, %eax + |