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/* SPDX-License-Identifier: GPL-2.0-only */
#include <amdblocks/smm.h>
#include <assert.h>
#include <stdint.h>
#include <cpu/x86/msr.h>
#include <cpu/x86/smm.h>
#include <cpu/amd/msr.h>
#include <cpu/amd/mtrr.h>
#include <cbmem.h>
#include <soc/northbridge.h>
#include <soc/iomap.h>
#include <amdblocks/biosram.h>
void *cbmem_top_chipset(void)
{
msr_t tom = rdmsr(TOP_MEM);
if (!tom.lo)
return 0;
/* 8MB alignment to keep MTRR usage low */
return (void *)ALIGN_DOWN(restore_top_of_low_cacheable()
- CONFIG_SMM_TSEG_SIZE, 8 * MiB);
}
static uintptr_t smm_region_start(void)
{
return (uintptr_t)cbmem_top();
}
static size_t smm_region_size(void)
{
return CONFIG_SMM_TSEG_SIZE;
}
void smm_region(uintptr_t *start, size_t *size)
{
static int once;
*start = smm_region_start();
*size = smm_region_size();
if (!once) {
clear_tvalid();
once = 1;
}
}
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