x86: acpi: Resume OS if resume vector is found
In an S3 resume path, U-Boot does everything like a cold boot except
in the last_stage_init() it jumps to the OS resume vector.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 7222ec8..f686ad4 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -26,6 +26,7 @@
#include <malloc.h>
#include <syscon.h>
#include <asm/acpi_s3.h>
+#include <asm/acpi_table.h>
#include <asm/control_regs.h>
#include <asm/coreboot_tables.h>
#include <asm/cpu.h>
@@ -204,6 +205,13 @@
int last_stage_init(void)
{
+#if CONFIG_HAVE_ACPI_RESUME
+ void *wake_vector = acpi_find_wakeup_vector();
+
+ if (wake_vector != NULL && gd->arch.prev_sleep_state == ACPI_S3)
+ acpi_resume(wake_vector);
+#endif
+
write_tables();
board_final_cleanup();