63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; version 2 of
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* the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <string.h>
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#include <arch/acpi.h>
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#include <console/console.h>
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#include <cbmem.h>
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#include <cpu/x86/smm.h>
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void *backup_default_smm_area(void)
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{
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void *save_area;
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const void *default_smm = (void *)SMM_DEFAULT_BASE;
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if (!CONFIG(HAVE_ACPI_RESUME))
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return NULL;
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/*
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* The buffer needs to be preallocated regardless. In the non-resume
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* path it will be allocated for handling resume. Note that cbmem_add()
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* does a find before the addition.
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*/
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save_area = cbmem_add(CBMEM_ID_SMM_SAVE_SPACE, SMM_DEFAULT_SIZE);
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if (save_area == NULL) {
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printk(BIOS_DEBUG, "SMM save area not added.\n");
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return NULL;
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}
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/* Only back up the area on S3 resume. */
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if (acpi_is_wakeup_s3()) {
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memcpy(save_area, default_smm, SMM_DEFAULT_SIZE);
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return save_area;
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}
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/*
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* Not the S3 resume path. No need to restore memory contents after
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* SMM relocation.
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*/
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return NULL;
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}
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void restore_default_smm_area(void *smm_save_area)
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{
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void *default_smm = (void *)SMM_DEFAULT_BASE;
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if (smm_save_area == NULL)
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return;
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memcpy(default_smm, smm_save_area, SMM_DEFAULT_SIZE);
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}
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