src/cpu/x86/mtrr/earlymtrr.c


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#include <cpu/x86/cache.h>
#include <cpu/x86/mtrr.h>
#include <cpu/x86/msr.h>

#ifdef __ROMCC__
static
#endif
void set_var_mtrr(
	unsigned reg, unsigned base, unsigned size, unsigned type)
{
	/* Bit Bit 32-35 of MTRRphysMask should be set to 1 */
	/* FIXME: It only support 4G less range */
	msr_t basem, maskm;
	basem.lo = base | type;
	basem.hi = 0;
	wrmsr(MTRR_PHYS_BASE(reg), basem);
	maskm.lo = ~(size - 1) | MTRR_PHYS_MASK_VALID;
	maskm.hi = (1 << (CONFIG_CPU_ADDR_BITS - 32)) - 1;
	wrmsr(MTRR_PHYS_MASK(reg), maskm);
}