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/* SPDX-License-Identifier: GPL-2.0-only */
/* This file is part of the coreboot project. */
#include <string.h>
#include <arch/acpi.h>
#include <console/console.h>
#include <cbmem.h>
#include <cpu/x86/smm.h>
void *backup_default_smm_area(void)
{
void *save_area;
const void *default_smm = (void *)SMM_DEFAULT_BASE;
if (!CONFIG(HAVE_ACPI_RESUME))
return NULL;
/*
* The buffer needs to be preallocated regardless. In the non-resume
* path it will be allocated for handling resume. Note that cbmem_add()
* does a find before the addition.
*/
save_area = cbmem_add(CBMEM_ID_SMM_SAVE_SPACE, SMM_DEFAULT_SIZE);
if (save_area == NULL) {
printk(BIOS_DEBUG, "SMM save area not added.\n");
return NULL;
}
/* Only back up the area on S3 resume. */
if (acpi_is_wakeup_s3()) {
memcpy(save_area, default_smm, SMM_DEFAULT_SIZE);
return save_area;
}
/*
* Not the S3 resume path. No need to restore memory contents after
* SMM relocation.
*/
return NULL;
}
void restore_default_smm_area(void *smm_save_area)
{
void *default_smm = (void *)SMM_DEFAULT_BASE;
if (smm_save_area == NULL)
return;
memcpy(default_smm, smm_save_area, SMM_DEFAULT_SIZE);
}
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