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/* 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 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"
/* enable cache */
"movl %cr0, %eax\n\t"
"andl $0x9fffffff,%eax\n\t"
"movl %eax, %cr0\n\t"
);
}
/* be warned, this file will be used core 0 / node 0 and ram stack is ready*/
static void disable_cache_as_ram_bsp(void)
{
__asm__ volatile (
"pushl %ecx\n\t"
"pushl %edx\n\t"
"pushl %eax\n\t"
);
disable_cache_as_ram();
__asm__ volatile (
"popl %eax\n\t"
"popl %edx\n\t"
"popl %ecx\n\t"
);
}
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