78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <cbmem.h>
|
|
#include <console/console.h>
|
|
#include <romstage_handoff.h>
|
|
|
|
struct romstage_handoff {
|
|
/* Indicate if the current boot is an S3 resume. If
|
|
* CONFIG_RELOCATABLE_RAMSTAGE is enabled the chipset code is
|
|
* responsible for initializing this variable. Otherwise, ramstage
|
|
* will be re-loaded from cbfs (which can be slower since it lives
|
|
* in flash). */
|
|
uint8_t s3_resume;
|
|
uint8_t reboot_required;
|
|
uint8_t reserved[2];
|
|
};
|
|
|
|
static struct romstage_handoff *romstage_handoff_find_or_add(void)
|
|
{
|
|
struct romstage_handoff *handoff;
|
|
|
|
/* cbmem_add() first does a find and uses the old location before the
|
|
* real add. However, it is important to know when the structure is not
|
|
* found so it can be initialized to 0. */
|
|
handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
|
|
|
|
if (handoff)
|
|
return handoff;
|
|
|
|
handoff = cbmem_add(CBMEM_ID_ROMSTAGE_INFO, sizeof(*handoff));
|
|
|
|
if (handoff != NULL)
|
|
memset(handoff, 0, sizeof(*handoff));
|
|
else
|
|
printk(BIOS_DEBUG, "Romstage handoff structure not added!\n");
|
|
|
|
return handoff;
|
|
}
|
|
|
|
int romstage_handoff_init(int is_s3_resume)
|
|
{
|
|
struct romstage_handoff *handoff;
|
|
|
|
handoff = romstage_handoff_find_or_add();
|
|
|
|
if (handoff == NULL)
|
|
return -1;
|
|
|
|
handoff->s3_resume = is_s3_resume;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int romstage_handoff_is_resume(void)
|
|
{
|
|
static int once, s3_resume;
|
|
struct romstage_handoff *handoff;
|
|
|
|
if (once)
|
|
return s3_resume;
|
|
|
|
/* Only try evaluate handoff once for s3 resume state. */
|
|
once = 1;
|
|
handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
|
|
if (handoff == NULL)
|
|
return 0;
|
|
|
|
s3_resume = handoff->s3_resume;
|
|
if (s3_resume)
|
|
printk(BIOS_DEBUG, "S3 Resume\n");
|
|
else
|
|
printk(BIOS_DEBUG, "Normal boot\n");
|
|
|
|
return s3_resume;
|
|
}
|