diff options
Diffstat (limited to 'src/cpu/amd/car/cache_as_ram_post.c')
-rw-r--r-- | src/cpu/amd/car/cache_as_ram_post.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/cpu/amd/car/cache_as_ram_post.c b/src/cpu/amd/car/cache_as_ram_post.c new file mode 100644 index 0000000000..66ca9fdf96 --- /dev/null +++ b/src/cpu/amd/car/cache_as_ram_post.c @@ -0,0 +1,94 @@ +/* by yhlu 6.2005 */ + __asm__ volatile ( + /* + FIXME : backup stack in CACHE_AS_RAM into mmx and sse and after we get STACK up, we restore that. + It is only needed if we want to go back + */ + + /* We don't need cache as ram for now on */ + /* disable cache */ + "movl %cr0, %eax\n\t" + "orl $(0x1<<30),%eax\n\t" + "movl %eax, %cr0\n\t" + + /* clear sth */ + "movl $0x269, %ecx\n\t" /* fix4k_c8000*/ + "xorl %edx, %edx\n\t" + "xorl %eax, %eax\n\t" + "wrmsr\n\t" +#if DCACHE_RAM_SIZE > 0x8000 + "movl $0x268, %ecx\n\t" /* fix4k_c0000*/ + "wrmsr\n\t" +#endif + + /* disable fixed mtrr from now on, it will be enabled by linuxbios_ram again*/ + "movl $0xC0010010, %ecx\n\t" +// "movl $SYSCFG_MSR, %ecx\n\t" + "rdmsr\n\t" + "andl $(~(3<<18)), %eax\n\t" +// "andl $(~(SYSCFG_MSR_MtrrFixDramModEn | SYSCFG_MSR_MtrrFixDramEn)), %eax\n\t" + "wrmsr\n\t" + + /* Set the default memory type and disable fixed and enable variable MTRRs */ + "movl $0x2ff, %ecx\n\t" +// "movl $MTRRdefType_MSR, %ecx\n\t" + "xorl %edx, %edx\n\t" + /* Enable Variable and Disable Fixed MTRRs */ + "movl $0x00000800, %eax\n\t" + "wrmsr\n\t" + +#if defined(CLEAR_FIRST_1M_RAM) + /* 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" + + "movl $0x201, %ecx\n\t" + "movl $0x0000000f, %edx\n\t" + "movl $((~(( 0 + 0x100000) - 1)) | 0x800), %eax\n\t" + "wrmsr\n\t" +#endif + + /* enable cache */ + "movl %cr0, %eax\n\t" + "andl $0x9fffffff,%eax\n\t" + "movl %eax, %cr0\n\t" +#if defined(CLEAR_FIRST_1M_RAM) + /* 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" + + /* 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" + + /* enable cache */ + "movl %cr0, %eax\n\t" + "andl $0x9fffffff,%eax\n\t" + "movl %eax, %cr0\n\t" + "invd\n\t" + + /* + FIXME: I hope we don't need to change esp and ebp value here, so we can restore value from mmx sse back + But the problem is the range is some io related, So don't go back + */ +#endif + ); |