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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <stdint.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/mtrr.h>
#include <cpu/amd/mtrr.h>
#include <cpu/x86/cache.h>
#include <string.h>
#include <northbridge/amd/agesa/agesa_helper.h>
static void write_mtrr(u8 **p_nvram_pos, unsigned int idx)
{
msr_t msr_data;
msr_data = rdmsr(idx);
memcpy(*p_nvram_pos, &msr_data, sizeof(msr_data));
*p_nvram_pos += sizeof(msr_data);
}
void backup_mtrr(void *mtrr_store, u32 *mtrr_store_size)
{
u8 *nvram_pos = mtrr_store;
msr_t msr_data;
u32 i;
/* Enable access to AMD RdDram and WrDram extension bits */
msr_data = rdmsr(SYSCFG_MSR);
msr_data.lo |= SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr_data);
/* Fixed MTRRs */
write_mtrr(&nvram_pos, MTRR_FIX_64K_00000);
write_mtrr(&nvram_pos, MTRR_FIX_16K_80000);
write_mtrr(&nvram_pos, MTRR_FIX_16K_A0000);
for (i = MTRR_FIX_4K_C0000; i <= MTRR_FIX_4K_F8000; i++)
write_mtrr(&nvram_pos, i);
/* Disable access to AMD RdDram and WrDram extension bits */
msr_data = rdmsr(SYSCFG_MSR);
msr_data.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr_data);
/* Variable MTRRs */
for (i = MTRR_PHYS_BASE(0); i < MTRR_PHYS_BASE(8); i++)
write_mtrr(&nvram_pos, i);
/* SYSCFG_MSR */
write_mtrr(&nvram_pos, SYSCFG_MSR);
/* TOM */
write_mtrr(&nvram_pos, TOP_MEM);
/* TOM2 */
write_mtrr(&nvram_pos, TOP_MEM2);
*mtrr_store_size = nvram_pos - (u8*) mtrr_store;
}
void restore_mtrr(void)
{
volatile u32 *msrPtr = (u32 *) OemS3Saved_MTRR_Storage();
u32 msr;
msr_t msr_data;
if (!msrPtr)
return;
disable_cache();
/* Enable access to AMD RdDram and WrDram extension bits */
msr_data = rdmsr(SYSCFG_MSR);
msr_data.lo |= SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr_data);
/* Now restore the Fixed MTRRs */
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(MTRR_FIX_64K_00000, msr_data);
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(MTRR_FIX_16K_80000, msr_data);
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(MTRR_FIX_16K_A0000, msr_data);
for (msr = MTRR_FIX_4K_C0000; msr <= MTRR_FIX_4K_F8000; msr++) {
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(msr, msr_data);
}
/* Disable access to AMD RdDram and WrDram extension bits */
msr_data = rdmsr(SYSCFG_MSR);
msr_data.lo &= ~SYSCFG_MSR_MtrrFixDramModEn;
wrmsr(SYSCFG_MSR, msr_data);
/* Restore the Variable MTRRs */
for (msr = MTRR_PHYS_BASE(0); msr <= MTRR_PHYS_MASK(7); msr++) {
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(msr, msr_data);
}
/* Restore SYSCFG MTRR */
msr_data.lo = *msrPtr;
msrPtr ++;
msr_data.hi = *msrPtr;
msrPtr ++;
wrmsr(SYSCFG_MSR, msr_data);
}
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