payload loading: remove passing of struct payload

There's no need to keep track of struct payload within
the boot state machine. It is completely contained within
the payload loader module.

Change-Id: I16fcecf43d7fb41fc311955fdb82eabbd5c96b11
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8836
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/include/program_loading.h

@@ -104,14 +104,11 @@ struct payload {
 	void *entry;
 };
 
-/*
- * Load payload into memory and return pointer to payload structure. Returns
- * NULL on error.
- */
-struct payload *payload_load(void);
+/* Load payload into memory in preparation to run. */
+void payload_load(void);
 
 /* Run the loaded payload. */
-void payload_run(const struct payload *payload);
+void payload_run(void);
 
 /* Mirror the payload to be loaded. */
 void mirror_payload(struct payload *payload);

src/lib/hardwaremain.c

@@ -227,26 +227,16 @@ static boot_state_t bs_write_tables(void *arg)
 
 static boot_state_t bs_payload_load(void *arg)
 {
-	struct payload *payload;
-
 	timestamp_add_now(TS_LOAD_PAYLOAD);
 
-	payload = payload_load();
-
-	if (! payload)
-		die("Could not load payload\n");
-
-	/* Pass the payload to the next state. */
-	boot_states[BS_PAYLOAD_BOOT].arg = payload;
+	payload_load();
 
 	return BS_PAYLOAD_BOOT;
 }
 
 static boot_state_t bs_payload_boot(void *arg)
 {
-	struct payload *payload = arg;
-
-	payload_run(payload);
+	payload_run();
 
 	printk(BIOS_EMERG, "Boot failed");
 	/* Returning from this state will fail because the following signals

src/lib/loaders/load_and_run_payload.c

@@ -44,7 +44,7 @@ void __attribute__((weak)) mirror_payload(struct payload *payload)
 	return;
 }
 
-struct payload *payload_load(void)
+void payload_load(void)
 {
 	int i;
 	void *entry;
@@ -65,24 +65,22 @@ struct payload *payload_load(void)
 	}
 
 	if (i == ARRAY_SIZE(payload_ops))
-		return NULL;
+		goto out;
 
 	mirror_payload(payload);
 
 	entry = selfload(payload);
 
-	if (entry == NULL)
-		return NULL;
-
 	payload->entry = entry;
 
-	return payload;
+out:
+	if (payload->entry == NULL)
+		die("Payload not loaded.\n");
 }
 
-void payload_run(const struct payload *payload)
+void payload_run(void)
 {
-	if (payload == NULL)
-		return;
+	const struct payload *payload = &global_payload;
 
 	/* Reset to booting from this image as late as possible */
 	boot_successful();