src/cpu/amd/car/disable_cache_as_ram.c

/* by yhlu 6.2005 */
/* be warned, this file will be used other cores and core 0 / node 0 */
static inline __attribute__((always_inline)) void disable_cache_as_ram(void)
{
        __asm__ __volatile__ (
        /* 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 CONFIG_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 coreboot_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"

        /* enable cache */
        "movl    %%cr0, %%eax\n\t"
        "andl    $0x9fffffff,%%eax\n\t"
        "movl    %%eax, %%cr0\n\t"
        ::: "memory", "eax", "ecx", "edx"
        );
}

static void disable_cache_as_ram_bsp(void)
{
	disable_cache_as_ram();
}