vboot: fix CONFIG_RESUME_PATH_SAME_AS_BOOT S3 resume logic

- should not check VBOOT_STARTS_IN_BOOTBLOCK to set context flag
- implement vboot_platform_is_resuming on platforms missing it
- add ACPI_INTEL_HARDWARE_SLEEP_VALUES to two intel southbridges

[ originally https://review.coreboot.org/c/coreboot/+/28750 ]

BUG=b:114018226
TEST=compile coreboot

Change-Id: I1ef0bcdfd01746198f8140f49698b58065d820b9
Signed-off-by: Joel Kitching <kitching@google.com>
Reviewed-on: https://review.coreboot.org/29060
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>

src/southbridge/intel/common/pmbase.c

@@ -14,13 +14,16 @@
  */
 
 #include <stdint.h>
+#include <arch/acpi.h>
 #include <arch/io.h>
 #include <device/device.h>
 #include <device/pci.h>
 #include <arch/early_variables.h>
 #include <assert.h>
+#include <security/vboot/vboot_common.h>
 
 #include "pmbase.h"
+#include "pmutil.h"
 
 /* LPC PM Base Address Register */
 #define PMBASE		0x40
@@ -91,3 +94,13 @@ u8 read_pmbase8(const u8 addr)
 
 	return inb(lpc_get_pmbase() + addr);
 }
+
+int vboot_platform_is_resuming(void)
+{
+	u16 reg16 = read_pmbase16(PM1_STS);
+
+	if (!(reg16 & WAK_STS))
+		return 0;
+
+	return acpi_sleep_from_pm1(reg16) == ACPI_S3;
+}

src/southbridge/intel/common/pmutil.h

@@ -17,6 +17,8 @@
 #ifndef INTEL_COMMON_PMUTIL_H
 #define INTEL_COMMON_PMUTIL_H
 
+#include <cpu/x86/smm.h>
+
 #define D31F0_PMBASE		0x40
 #define D31F0_GEN_PMCON_3	0xa4
 #define D31F0_GPIO_ROUT		0xb8

src/southbridge/intel/i82371eb/Kconfig

@@ -1,4 +1,5 @@
 config SOUTHBRIDGE_INTEL_I82371EB
+	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
 	select SOUTHBRIDGE_INTEL_COMMON
 	select SOUTHBRIDGE_INTEL_COMMON_SMBUS
 	bool

src/southbridge/intel/i82801jx/Kconfig

@@ -28,6 +28,7 @@ config SOUTHBRIDGE_INTEL_I82801JX
 	select SOUTHBRIDGE_INTEL_COMMON_GPIO
 	select INTEL_DESCRIPTOR_MODE_CAPABLE
 	select COMMON_FADT
+	select ACPI_INTEL_HARDWARE_SLEEP_VALUES
 
 if SOUTHBRIDGE_INTEL_I82801JX