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-rw-r--r--src/arch/x86/acpi_s3.c137
-rw-r--r--src/arch/x86/include/arch/acpi.h12
2 files changed, 126 insertions, 23 deletions
diff --git a/src/arch/x86/acpi_s3.c b/src/arch/x86/acpi_s3.c
index c327cbd93a..ffec64d03a 100644
--- a/src/arch/x86/acpi_s3.c
+++ b/src/arch/x86/acpi_s3.c
@@ -19,8 +19,10 @@
#include <cbmem.h>
#include <cpu/cpu.h>
#include <timestamp.h>
+#include <program_loading.h>
#include <romstage_handoff.h>
#include <rules.h>
+#include <symbols.h>
#if ENV_RAMSTAGE
@@ -79,30 +81,125 @@ void acpi_fail_wakeup(void)
}
#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;
+}
+
+/* Make backup of low-memory region, relying on the base and size
+ * of the ramstage that was loaded before entry to ACPI S3.
+ *
+ * DEPRECATED
+ */
void acpi_prepare_for_resume(void)
{
- if (!HIGH_MEMORY_SAVE)
+ struct resume_backup *backup_mem = cbmem_find(CBMEM_ID_RESUME);
+ if (!backup_mem)
return;
/* Back up the OS-controlled memory where ramstage will be loaded. */
- void *src = (void *)CONFIG_RAMBASE;
- void *dest = cbmem_find(CBMEM_ID_RESUME);
- if (dest != NULL)
- memcpy(dest, src, HIGH_MEMORY_SAVE);
+ 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;
- /* Let's prepare the ACPI S3 Resume area now already, so we can rely on
- * it being there during reboot time. We don't need the pointer, nor
- * the result right now. If it fails, ACPI resume will be disabled.
- */
+ if (IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE))
+ return;
- if (HIGH_MEMORY_SAVE)
- cbmem_add(CBMEM_ID_RESUME, HIGH_MEMORY_SAVE);
+ backup_create_or_update(NULL, (uintptr_t)_program, _program_size);
}
#define WAKEUP_BASE 0x600
@@ -115,17 +212,22 @@ extern unsigned int __wakeup_size;
static void acpi_jump_to_wakeup(void *vector)
{
- uintptr_t acpi_backup_memory = 0;
+ 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 (HIGH_MEMORY_SAVE) {
- acpi_backup_memory = (uintptr_t)cbmem_find(CBMEM_ID_RESUME);
-
- if (!acpi_backup_memory) {
+ 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;
@@ -137,8 +239,7 @@ static void acpi_jump_to_wakeup(void *vector)
timestamp_add_now(TS_ACPI_WAKE_JUMP);
- acpi_do_wakeup((uintptr_t)vector, acpi_backup_memory, CONFIG_RAMBASE,
- HIGH_MEMORY_SAVE);
+ acpi_do_wakeup((uintptr_t)vector, source, target, size);
}
void __attribute__((weak)) mainboard_suspend_resume(void)
diff --git a/src/arch/x86/include/arch/acpi.h b/src/arch/x86/include/arch/acpi.h
index 7fc1c50310..7c296480bc 100644
--- a/src/arch/x86/include/arch/acpi.h
+++ b/src/arch/x86/include/arch/acpi.h
@@ -25,12 +25,7 @@
#ifndef __ASM_ACPI_H
#define __ASM_ACPI_H
-#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME) && \
- ! IS_ENABLED(CONFIG_RELOCATABLE_RAMSTAGE)
#define HIGH_MEMORY_SAVE (CONFIG_RAMTOP - CONFIG_RAMBASE)
-#else
-#define HIGH_MEMORY_SAVE 0
-#endif
#if IS_ENABLED(CONFIG_ACPI_INTEL_HARDWARE_SLEEP_VALUES)
/*
@@ -688,6 +683,13 @@ static inline int acpi_s3_resume_allowed(void)
return IS_ENABLED(CONFIG_HAVE_ACPI_RESUME);
}
+/* Return address in reserved memory where to backup low memory
+ * while platform resumes from S3 suspend. Caller is responsible of
+ * making a complete copy of the region base..base+size, with
+ * parameteres base and size that meet page alignment requirement.
+ */
+void *acpi_backup_container(uintptr_t base, size_t size);
+
#if IS_ENABLED(CONFIG_HAVE_ACPI_RESUME)
extern int acpi_slp_type;