| /* |
| * This file is part of the coreboot project. |
| * |
| * Copyright (C) 2005-2009 coresystems GmbH |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <console/console.h> |
| #include <string.h> |
| #include <arch/acpi.h> |
| #include <arch/cpu.h> |
| #include <cbmem.h> |
| #include <fallback.h> |
| #include <timestamp.h> |
| #include <program_loading.h> |
| #include <romstage_handoff.h> |
| #include <symbols.h> |
| |
| #if ENV_RAMSTAGE || ENV_POSTCAR |
| |
| /* This is filled with acpi_is_wakeup() call early in ramstage. */ |
| static int acpi_slp_type = -1; |
| |
| static void acpi_handoff_wakeup(void) |
| { |
| if (acpi_slp_type < 0) { |
| if (romstage_handoff_is_resume()) { |
| printk(BIOS_DEBUG, "S3 Resume.\n"); |
| acpi_slp_type = ACPI_S3; |
| } else { |
| printk(BIOS_DEBUG, "Normal boot.\n"); |
| acpi_slp_type = ACPI_S0; |
| } |
| } |
| } |
| |
| int acpi_is_wakeup(void) |
| { |
| acpi_handoff_wakeup(); |
| /* Both resume from S2 and resume from S3 restart at CPU reset */ |
| return (acpi_slp_type == ACPI_S3 || acpi_slp_type == ACPI_S2); |
| } |
| |
| int acpi_is_wakeup_s3(void) |
| { |
| acpi_handoff_wakeup(); |
| return (acpi_slp_type == ACPI_S3); |
| } |
| |
| int acpi_is_wakeup_s4(void) |
| { |
| acpi_handoff_wakeup(); |
| return (acpi_slp_type == ACPI_S4); |
| } |
| |
| void acpi_fail_wakeup(void) |
| { |
| if (acpi_slp_type == ACPI_S3 || acpi_slp_type == ACPI_S2) |
| acpi_slp_type = ACPI_S0; |
| } |
| #endif /* ENV_RAMSTAGE */ |
| |
| struct resume_backup { |
| uint64_t cbmem; |
| uint64_t lowmem; |
| uint64_t size; |
| uint8_t valid; |
| }; |
| |
| #define BACKUP_PAGE_SZ 4096 |
| |
| static int backup_create_or_update(struct resume_backup *backup_mem, |
| uintptr_t base, size_t size) |
| { |
| uintptr_t top; |
| |
| if (IS_ENABLED(CONFIG_ACPI_HUGE_LOWMEM_BACKUP)) { |
| base = CONFIG_RAMBASE; |
| size = HIGH_MEMORY_SAVE; |
| } |
| |
| /* Align backup region to complete pages. */ |
| top = ALIGN_UP(base + size, BACKUP_PAGE_SZ); |
| base = ALIGN_DOWN(base, BACKUP_PAGE_SZ); |
| size = top - base; |
| |
| /* Cannot extend existing region, should not happen. */ |
| if (backup_mem && (backup_mem->size < size)) |
| return -1; |
| |
| /* Allocate backup with room for header. */ |
| if (!backup_mem) { |
| size_t header_sz = ALIGN_UP(sizeof(*backup_mem), |
| BACKUP_PAGE_SZ); |
| backup_mem = cbmem_add(CBMEM_ID_RESUME, header_sz + size); |
| if (!backup_mem) |
| return -1; |
| |
| /* Container starts from boundary after header. */ |
| backup_mem->cbmem = (uintptr_t)backup_mem + header_sz; |
| } |
| |
| backup_mem->valid = 0; |
| backup_mem->lowmem = base; |
| backup_mem->size = size; |
| return 0; |
| } |
| |
| void *acpi_backup_container(uintptr_t base, size_t size) |
| { |
| struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME); |
| if (!backup_mem) |
| return NULL; |
| |
| if (!IS_ALIGNED(base, BACKUP_PAGE_SZ) || !IS_ALIGNED(size, |
| BACKUP_PAGE_SZ)) |
| return NULL; |
| |
| if (backup_create_or_update(backup_mem, base, size) < 0) |
| return NULL; |
| |
| backup_mem->valid = 1; |
| return (void *)(uintptr_t)backup_mem->cbmem; |
| } |
| |
| void backup_ramstage_section(uintptr_t base, size_t size) |
| { |
| struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME); |
| |
| /* For first boot we exit here as CBMEM_ID_RESUME is only |
| * created late in ramstage with acpi_prepare_resume_backup(). |
| */ |
| if (!backup_mem) |
| return; |
| |
| /* Check that the backup is not done twice. */ |
| if (backup_mem->valid) |
| return; |
| |
| /* When we are called from ramstage loader, update header with |
| * properties of the ramstage we will load. |
| */ |
| if (backup_create_or_update(backup_mem, base, size) < 0) |
| return; |
| |
| /* Back up the OS-controlled memory where ramstage will be loaded. */ |
| memcpy((void *)(uintptr_t)backup_mem->cbmem, |
| (void *)(uintptr_t)backup_mem->lowmem, |
| (size_t)backup_mem->size); |
| backup_mem->valid = 1; |
| } |
| |
| /* Let's prepare the ACPI S3 Resume area now already, so we can rely on |
| * it being there during reboot time. If this fails, ACPI resume will |
| * be disabled. We assume that ramstage does not change while in suspend, |
| * so base and size of the currently running ramstage are used |
| * for allocation. |
| */ |
| void acpi_prepare_resume_backup(void) |
| { |
| if (!acpi_s3_resume_allowed()) |
| return; |
| |
| if (IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)) |
| return; |
| |
| backup_create_or_update(NULL, (uintptr_t)_program, _program_size); |
| } |
| |
| #define WAKEUP_BASE 0x600 |
| |
| asmlinkage void (*acpi_do_wakeup)(uintptr_t vector, u32 backup_source, |
| u32 backup_target, u32 backup_size) = (void *)WAKEUP_BASE; |
| |
| extern unsigned char __wakeup; |
| extern unsigned int __wakeup_size; |
| |
| static void acpi_jump_to_wakeup(void *vector) |
| { |
| uintptr_t source = 0, target = 0; |
| size_t size = 0; |
| |
| if (!acpi_s3_resume_allowed()) { |
| printk(BIOS_WARNING, "ACPI: S3 resume not allowed.\n"); |
| return; |
| } |
| |
| if (!IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)) { |
| struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME); |
| if (backup_mem && backup_mem->valid) { |
| backup_mem->valid = 0; |
| target = backup_mem->lowmem; |
| source = backup_mem->cbmem; |
| size = backup_mem->size; |
| } else { |
| printk(BIOS_WARNING, "ACPI: Backup memory missing. " |
| "No S3 resume.\n"); |
| return; |
| } |
| } |
| |
| /* Copy wakeup trampoline in place. */ |
| memcpy((void *)WAKEUP_BASE, &__wakeup, __wakeup_size); |
| |
| set_boot_successful(); |
| |
| timestamp_add_now(TS_ACPI_WAKE_JUMP); |
| |
| acpi_do_wakeup((uintptr_t)vector, source, target, size); |
| } |
| |
| void __weak mainboard_suspend_resume(void) |
| { |
| } |
| |
| void acpi_resume(void *wake_vec) |
| { |
| if (IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)) { |
| void *gnvs_address = cbmem_find(CBMEM_ID_ACPI_GNVS); |
| |
| /* Restore GNVS pointer in SMM if found */ |
| if (gnvs_address) { |
| printk(BIOS_DEBUG, "Restore GNVS pointer to %p\n", |
| gnvs_address); |
| smm_setup_structures(gnvs_address, NULL, NULL); |
| } |
| } |
| |
| /* Call mainboard resume handler first, if defined. */ |
| mainboard_suspend_resume(); |
| |
| post_code(POST_OS_RESUME); |
| acpi_jump_to_wakeup(wake_vec); |
| } |