diff options
Diffstat (limited to 'src/cpu/intel')
| -rw-r--r-- | src/cpu/intel/model_206ax/cache_as_ram.inc | 56 |
1 files changed, 23 insertions, 33 deletions
diff --git a/src/cpu/intel/model_206ax/cache_as_ram.inc b/src/cpu/intel/model_206ax/cache_as_ram.inc index d51fd01c05..f0d49390ba 100644 --- a/src/cpu/intel/model_206ax/cache_as_ram.inc +++ b/src/cpu/intel/model_206ax/cache_as_ram.inc @@ -174,10 +174,9 @@ before_romstage: post_code(0x29) /* Call romstage.c main function. */ call romstage_main - /* Save return value from romstage_main. It contains the stack to use - * after cache-as-ram is torn down. - */ + * after cache-as-ram is torn down. It also contains the information + * for setting up MTRRs. */ movl %eax, %esp post_code(0x30) @@ -210,14 +209,6 @@ before_romstage: andl $~1, %eax wrmsr - /* Clear MTRR that was used to cache MRC */ - xorl %eax, %eax - xorl %edx, %edx - movl $MTRR_PHYS_BASE(2), %ecx - wrmsr - movl $MTRR_PHYS_MASK(2), %ecx - wrmsr - post_code(0x33) /* Enable cache. */ @@ -234,32 +225,31 @@ before_romstage: post_code(0x38) - /* Enable Write Back and Speculative Reads for the first MB - * and ramstage. - */ + /* Get number of MTRRs. */ + popl %ebx movl $MTRR_PHYS_BASE(0), %ecx - movl $(0x00000000 | MTRR_TYPE_WRBACK), %eax - xorl %edx, %edx - wrmsr - movl $MTRR_PHYS_MASK(0), %ecx - movl $(~(CACHE_TMP_RAMTOP - 1) | MTRR_PHYS_MASK_VALID), %eax - movl $CPU_PHYSMASK_HI, %edx // 36bit address space +1: + testl %ebx, %ebx + jz 1f + + /* Low 32 bits of MTRR base. */ + popl %eax + /* Upper 32 bits of MTRR base. */ + popl %edx + /* Write MTRR base. */ wrmsr - -#if CACHE_ROM_SIZE - /* Enable Caching and speculative Reads for the - * complete ROM now that we actually have RAM. - */ - movl $MTRR_PHYS_BASE(1), %ecx - movl $(CACHE_ROM_BASE | MTRR_TYPE_WRPROT), %eax - xorl %edx, %edx - wrmsr - movl $MTRR_PHYS_MASK(1), %ecx - movl $(~(CACHE_ROM_SIZE - 1) | MTRR_PHYS_MASK_VALID), %eax - movl $CPU_PHYSMASK_HI, %edx + inc %ecx + /* Low 32 bits of MTRR mask. */ + popl %eax + /* Upper 32 bits of MTRR mask. */ + popl %edx + /* Write MTRR mask. */ wrmsr -#endif + inc %ecx + dec %ebx + jmp 1b +1: post_code(0x39) /* And enable cache again after setting MTRRs. */ |