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use CONFIG_LB_MEM_TOPK instead 1M hardcode from issue 50 

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@2139 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Yinghai Lu 2005-12-07 19:02:45 +00:00
parent 73cc74e4f0
commit c3b3600222
1 changed files with 48 additions and 44 deletions
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52
src/cpu/amd/car/clear_1m_ram.c
View File

@ -3,54 +3,58 @@
static inline __attribute__((always_inline)) void clear_1m_ram(void)
{
__asm__ volatile (
/* disable cache */
"movl %cr0, %eax\n\t"
"orl $(0x1<<30),%eax\n\t"
"movl %eax, %cr0\n\t"
);
/* enable caching for first 1M using variable mtrr */
"movl $0x200, %ecx\n\t"
"xorl %edx, %edx\n\t"
"movl $(0 | 1), %eax\n\t"
// "movl $(0 | MTRR_TYPE_WRCOMB), %eax\n\t"
"wrmsr\n\t"
__asm__ volatile (
"wrmsr"
: /* No outputs */
: "c" (0x200), "a" (0 | MTRR_TYPE_WRCOMB), "d" (0)
);
"movl $0x201, %ecx\n\t"
"movl $0x0000000f, %edx\n\t"
"movl $((~(( 0 + 0x100000) - 1)) | 0x800), %eax\n\t"
"wrmsr\n\t"
__asm__ volatile (
"wrmsr"
: /* No outputs */
: "c" (0x201), "a" ((~(( 0 + (CONFIG_LB_MEM_TOPK<<10) ) -1)) | 0x800), "d" (0x0000000f)
);
__asm__ volatile(
/* clear the first 1M */
"movl $0x0, %edi\n\t"
"cld\n\t"
"movl $(0x100000>>2), %ecx\n\t"
"xorl %eax, %eax\n\t"
"rep stosl\n\t"
:
: "a"(0), "D"(0) ,"c" ((CONFIG_LB_MEM_TOPK<<10)>>2)
);
__asm__ volatile (
/* disable cache */
"movl %cr0, %eax\n\t"
"orl $(0x1<<30),%eax\n\t"
"movl %eax, %cr0\n\t"
);
/* enable caching for first 1M using variable mtrr */
"movl $0x200, %ecx\n\t"
"xorl %edx, %edx\n\t"
"movl $(0 | 6), %eax\n\t"
// "movl $(0 | MTRR_TYPE_WRBACK), %eax\n\t"
"wrmsr\n\t"
"movl $0x201, %ecx\n\t"
"movl $0x0000000f, %edx\n\t"
"movl $((~(( 0 + 0x100000) - 1)) | 0x800), %eax\n\t"
"wrmsr\n\t"
__asm__ volatile (
"wrmsr"
: /* No outputs */
: "c" (0x200), "a" (0 | MTRR_TYPE_WRBACK), "d" (0)
);
__asm__ volatile (
"wrmsr"
: /* No outputs */
: "c" (0x201), "a" ((~(( 0 + (CONFIG_LB_MEM_TOPK<<10) ) -1)) | 0x800), "d" (0x0000000f)
);
__asm__ volatile (
/* enable cache */
"movl %cr0, %eax\n\t"
"andl $0x9fffffff,%eax\n\t"
"movl %eax, %cr0\n\t"
"invd\n\t"
);
}