| /* 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; |
| } |