romstage_handoff: add helper to determine resume status

Instead of having callers query the romstage handoff resume
status by inspecting the object themselves add
romstage_handoff_is_resume() so that the same information
can be queried easily.

Change-Id: I40f3769b7646bf296ee4bc323a9ab1d5e5691e21
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/17647
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>

src/arch/x86/acpi_s3.c

@@ -32,14 +32,7 @@ int acpi_slp_type = -1;
 #if IS_ENABLED(CONFIG_EARLY_CBMEM_INIT)
 int acpi_get_sleep_type(void)
 {
-	struct romstage_handoff *handoff;
+	if (romstage_handoff_is_resume()) {
-
-	handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
-
-	if (handoff == NULL) {
-		printk(BIOS_DEBUG, "Unknown boot method, assuming normal.\n");
-		return ACPI_S0;
-	} else if (handoff->s3_resume) {
 		printk(BIOS_DEBUG, "S3 Resume.\n");
 		return ACPI_S3;
 	} else {

src/include/romstage_handoff.h

@@ -78,4 +78,17 @@ static inline int romstage_handoff_init(int is_s3_resume)
 	return 0;
 }
 
+/* Return 1 if resuming or 0 if not. */
+static inline int romstage_handoff_is_resume(void)
+{
+	struct romstage_handoff *handoff;
+
+	handoff = cbmem_find(CBMEM_ID_ROMSTAGE_INFO);
+
+	if (handoff == NULL)
+		return 0;
+
+	return handoff->s3_resume;
+}
+
 #endif /* ROMSTAGE_HANDOFF_H */

src/lib/prog_loaders.c

@@ -85,10 +85,11 @@ static void ramstage_cache_invalid(void)
 	}
 }
 
-static void run_ramstage_from_resume(struct romstage_handoff *handoff,
+static void run_ramstage_from_resume(struct prog *ramstage)
-					struct prog *ramstage)
 {
-	if (handoff != NULL && handoff->s3_resume) {
+	if (!romstage_handoff_is_resume())
+		return;
+
 	/* Load the cached ramstage to runtime location. */
 	stage_cache_load_stage(STAGE_RAMSTAGE, ramstage);
 
@@ -97,7 +98,6 @@ static void run_ramstage_from_resume(struct romstage_handoff *handoff,
 		prog_run(ramstage);
 	}
 	ramstage_cache_invalid();
-	}
 }
 
 static int load_relocatable_ramstage(struct prog *ramstage)
@@ -136,8 +136,7 @@ void run_ramstage(void)
 	if (IS_ENABLED(CONFIG_ARCH_X86) &&
 	    !IS_ENABLED(CONFIG_NO_STAGE_CACHE) &&
 	    IS_ENABLED(CONFIG_EARLY_CBMEM_INIT))
-		run_ramstage_from_resume(romstage_handoff_find_or_add(),
+		run_ramstage_from_resume(&ramstage);
-						&ramstage);
 
 	if (prog_locate(&ramstage))
 		goto fail;

src/soc/intel/apollolake/chip.c

@@ -260,7 +260,6 @@ static void set_power_limits(void)
 static void soc_init(void *data)
 {
 	struct global_nvs_t *gnvs;
-	struct romstage_handoff *handoff;
 
 	/* Save VBT info and mapping */
 	vbt = vbt_get(&vbt_rdev);
@@ -269,8 +268,7 @@ static void soc_init(void *data)
 	 * default policy that doesn't honor boards' requirements. */
 	itss_snapshot_irq_polarities(GPIO_IRQ_START, GPIO_IRQ_END);
 
-	handoff = romstage_handoff_find_or_add();
+	fsp_silicon_init(romstage_handoff_is_resume());
-	fsp_silicon_init(handoff->s3_resume);
 
 	/* Restore GPIO IRQ polarities back to previous settings. */
 	itss_restore_irq_polarities(GPIO_IRQ_START, GPIO_IRQ_END);

src/soc/intel/quark/chip.c

@@ -102,8 +102,6 @@ static const struct reg_script thermal_init_script[] = {
 
 static void chip_init(void *chip_info)
 {
-	struct romstage_handoff *handoff;
-
 	/* Validate the temperature settings */
 	ASSERT(PLATFORM_CATASTROPHIC_TRIP_CELSIUS <= 255);
 	ASSERT(PLATFORM_CATASTROPHIC_TRIP_CELSIUS
@@ -120,8 +118,7 @@ static void chip_init(void *chip_info)
 			| TS_LOCK_AUX_TRIP_PT_REGS_ENABLE));
 
 	/* Perform silicon specific init. */
-	handoff = romstage_handoff_find_or_add();
+	fsp_silicon_init(romstage_handoff_is_resume());
-	fsp_silicon_init(handoff->s3_resume);
 }
 
 static void pci_domain_set_resources(device_t dev)

src/soc/intel/skylake/chip_fsp20.c

@@ -35,13 +35,8 @@
 
 void soc_init_pre_device(void *chip_info)
 {
-	struct romstage_handoff *handoff;
-
-	/* Get S3 status to pass to silicon init. */
-	handoff = romstage_handoff_find_or_add();
-
 	/* Perform silicon specific init. */
-	fsp_silicon_init(handoff->s3_resume);
+	fsp_silicon_init(romstage_handoff_is_resume());
 }
 
 static void pci_domain_set_resources(device_t dev)