coreboot: infrastructure for different ramstage loaders

There are 2 methods currently available in coreboot to load
ramstage from romstage: cbfs and vboot. The vboot path had
to be explicitly enabled and code needed to be added to
each chipset to support both. Additionally, many of the paths
were duplicated between the two. An additional complication
is the presence of having a relocatable ramstage which creates
another path with duplication.

To rectify this situation provide a common API through the
use of a callback to load the ramstage. The rest of the
existing logic to handle all the various cases is put in
a common place.

Change-Id: I5268ce70686cc0d121161a775c3a86ea38a4d8ae
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/5087
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>

14 files changed, 297 insertions, 134 deletions

diff --git a/src/arch/x86/lib/cbfs_and_run.c b/src/arch/x86/lib/cbfs_and_run.c
index 3d56e19318..ca8d61be54 100644
--- a/src/arch/x86/lib/cbfs_and_run.c
+++ b/src/arch/x86/lib/cbfs_and_run.c
@@ -17,27 +17,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
-#include <console/console.h>
-#include <cbfs.h>
 #include <arch/stages.h>
-#include <timestamp.h>
-
-static void cbfs_and_run_core(const char *filename)
-{
-	u8 *dst;
-
-	timestamp_add_now(TS_START_COPYRAM);
-	print_debug("Loading image.\n");
-	dst = cbfs_load_stage(CBFS_DEFAULT_MEDIA, filename);
-	if ((void *)dst == (void *) -1)
-		die("FATAL: Essential component is missing.\n");
-
-	timestamp_add_now(TS_END_COPYRAM);
-	print_debug("Jumping to image.\n");
-	stage_exit(dst);
-}
+#include <ramstage_loader.h>
 
 void asmlinkage copy_and_run(void)
 {
-	cbfs_and_run_core(CONFIG_CBFS_PREFIX "/coreboot_ram");
+	run_ramstage();
 }
diff --git a/src/cpu/intel/haswell/romstage.c b/src/cpu/intel/haswell/romstage.c
index 60a1c3a155..9e2766808d 100644
--- a/src/cpu/intel/haswell/romstage.c
+++ b/src/cpu/intel/haswell/romstage.c
@@ -309,8 +309,6 @@ void romstage_after_car(void)
 
 	prepare_for_resume(handoff);
 
-	vboot_verify_firmware(handoff);
-
 	/* Load the ramstage. */
 	copy_and_run();
 }
diff --git a/src/include/cbfs.h b/src/include/cbfs.h
index c05566d0b0..9ce862bbe5 100644
--- a/src/include/cbfs.h
+++ b/src/include/cbfs.h
@@ -83,6 +83,10 @@ void selfboot(void *entry);
 /* Defined in individual arch / board implementation. */
 int init_default_cbfs_media(struct cbfs_media *media);
 
+#if defined(__PRE_RAM__)
+struct romstage_handoff;
+struct cbmem_entry;
+
 #if CONFIG_RELOCATABLE_RAMSTAGE && defined(__PRE_RAM__)
 /* The cache_loaded_ramstage() and load_cached_ramstage() functions are defined
  * to be weak so that board and chipset code may override them. Their job is to
@@ -90,9 +94,6 @@ int init_default_cbfs_media(struct cbfs_media *media);
  * relocated ramstage is saved using the cbmem infrastructure. These
  * functions are only valid during romstage. */
 
-struct romstage_handoff;
-struct cbmem_entry;
-
 /* The implementer of cache_loaded_ramstage() may use the romstage_handoff
  * structure to store information, but note that the handoff variable can be
  * NULL. The ramstage cbmem_entry represents the region occupied by the loaded
@@ -105,7 +106,22 @@ cache_loaded_ramstage(struct romstage_handoff *handoff,
 void * __attribute__((weak))
 load_cached_ramstage(struct romstage_handoff *handoff,
                      const struct cbmem_entry *ramstage);
+#else  /* CONFIG_RELOCATABLE_RAMSTAGE */
+
+static inline void cache_loaded_ramstage(struct romstage_handoff *handoff,
+			const struct cbmem_entry *ramstage, void *entry_point)
+{
+}
+
+static inline void *
+load_cached_ramstage(struct romstage_handoff *handoff,
+			const struct cbmem_entry *ramstage)
+{
+	return NULL;
+}
+
 #endif /* CONFIG_RELOCATABLE_RAMSTAGE */
+#endif /* defined(__PRE_RAM__) */
 
 #endif
 
diff --git a/src/include/cbmem.h b/src/include/cbmem.h
index 9e68ba92f4..b47a847718 100644
--- a/src/include/cbmem.h
+++ b/src/include/cbmem.h
@@ -66,6 +66,7 @@
 #define CBMEM_ID_HOB_POINTER		0x484f4221
 
 #ifndef __ASSEMBLER__
+#include <stddef.h>
 #include <stdint.h>
 
 struct cbmem_entry;
@@ -150,6 +151,10 @@ void cbmem_late_set_table(uint64_t base, uint64_t size);
 void get_cbmem_table(uint64_t *base, uint64_t *size);
 struct cbmem_entry *get_cbmem_toc(void);
 
+static inline const struct cbmem_entry *cbmem_entry_find(uint32_t id)
+{
+	return NULL;
+}
 #endif /* CONFIG_DYNAMIC_CBMEM */
 
 /* Common API between cbmem and dynamic cbmem. */
diff --git a/src/include/ramstage_loader.h b/src/include/ramstage_loader.h
new file mode 100644
index 0000000000..ad085c0ba5
--- /dev/null
+++ b/src/include/ramstage_loader.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#ifndef RAMSTAGE_LOADER_H
+#define RAMSTAGE_LOADER_H
+
+#include <stdint.h>
+struct cbmem_entry;
+
+/* Run ramstage from romstage. */
+void run_ramstage(void);
+
+struct ramstage_loader_ops {
+	const char *name;
+	void *(*load)(uint32_t cbmem_id, const char *name,
+			const struct cbmem_entry **cbmem_entry);
+};
+
+#endif  /* RAMSTAGE_LOADER_H */
diff --git a/src/include/romstage_handoff.h b/src/include/romstage_handoff.h
index 699838a260..307babd329 100644
--- a/src/include/romstage_handoff.h
+++ b/src/include/romstage_handoff.h
@@ -41,6 +41,7 @@ struct romstage_handoff {
 };
 
 #if defined(__PRE_RAM__)
+#if CONFIG_EARLY_CBMEM_INIT
 /* The romstage_handoff_find_or_add() function provides the necessary logic
  * for initializing the romstage_handoff structure in cbmem. Different components
  * of the romstage may be responsible for setting up different fields. Therefore
@@ -63,7 +64,14 @@ static inline struct romstage_handoff *romstage_handoff_find_or_add(void)
 
 	return handoff;
 }
-#endif
+#else /* CONFIG_EARLY_CBMEM_INIT */
+static inline struct romstage_handoff *romstage_handoff_find_or_add(void)
+{
+	return NULL;
+}
+#endif /* CONFIG_EARLY_CBMEM_INIT */
+
+#endif /* defined(__PRE_RAM__) */
 
 #endif /* ROMSTAGE_HANDOFF_H */
 
diff --git a/src/lib/Makefile.inc b/src/lib/Makefile.inc
index 79ceebf44b..5c37329b5c 100644
--- a/src/lib/Makefile.inc
+++ b/src/lib/Makefile.inc
@@ -16,6 +16,7 @@
 # along with this program; if not, write to the Free Software
 # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 #
+subdirs-y += loaders
 
 bootblock-y += cbfs.c
 ifneq ($(CONFIG_HAVE_ARCH_MEMSET),y)
diff --git a/src/lib/cbfs.c b/src/lib/cbfs.c
index 9fe1757a65..f2a2587669 100644
--- a/src/lib/cbfs.c
+++ b/src/lib/cbfs.c
@@ -123,58 +123,6 @@ void *cbfs_load_optionrom(struct cbfs_media *media, uint16_t vendor,
 	return dest;
 }
 
-#if CONFIG_RELOCATABLE_RAMSTAGE && defined(__PRE_RAM__)
-
-#include <rmodule.h>
-#include <romstage_handoff.h>
-static void *load_stage_from_cbfs(struct cbfs_media *media, const char *name,
-                                  struct romstage_handoff *handoff)
-{
-	struct rmod_stage_load rmod_ram = {
-		.cbmem_id = CBMEM_ID_RAMSTAGE,
-		.name = name,
-	};
-
-	if (rmodule_stage_load_from_cbfs(&rmod_ram)) {
-		printk(BIOS_DEBUG, "Could not load ramstage.\n");
-		return (void *) -1;
-	}
-
-	cache_loaded_ramstage(handoff, rmod_ram.cbmem_entry, rmod_ram.entry);
-
-	return rmod_ram.entry;
-}
-
-void * cbfs_load_stage(struct cbfs_media *media, const char *name)
-{
-	struct romstage_handoff *handoff;
-	const struct cbmem_entry *ramstage;
-	void *entry;
-
-	handoff = romstage_handoff_find_or_add();
-
-	if (handoff == NULL) {
-		LOG("Couldn't find or allocate romstage handoff.\n");
-		return load_stage_from_cbfs(media, name, handoff);
-	} else if (!handoff->s3_resume)
-		return load_stage_from_cbfs(media, name, handoff);
-
-	ramstage = cbmem_entry_find(CBMEM_ID_RAMSTAGE);
-
-	if (ramstage == NULL)
-		return load_stage_from_cbfs(media, name, handoff);
-
-	/* S3 resume path. Load a cached copy of the loaded ramstage. If
-	 * return value is NULL load from cbfs. */
-	entry = load_cached_ramstage(handoff, ramstage);
-	if (entry == NULL)
-		return load_stage_from_cbfs(media, name, handoff);
-
-	return entry;
-}
-
-#else
-
 void * cbfs_load_stage(struct cbfs_media *media, const char *name)
 {
 	struct cbfs_stage *stage = (struct cbfs_stage *)
@@ -211,7 +159,6 @@ void * cbfs_load_stage(struct cbfs_media *media, const char *name)
 
 	return (void *) entry;
 }
-#endif /* CONFIG_RELOCATABLE_RAMSTAGE */
 
 #if !CONFIG_ALT_CBFS_LOAD_PAYLOAD
 void *cbfs_load_payload(struct cbfs_media *media, const char *name)
diff --git a/src/lib/loaders/Makefile.inc b/src/lib/loaders/Makefile.inc
new file mode 100644
index 0000000000..eceaa00c44
--- /dev/null
+++ b/src/lib/loaders/Makefile.inc
@@ -0,0 +1,21 @@
+#
+# This file is part of the coreboot project.
+#
+# Copyright (C) 2014 Google Inc.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+#
+
+romstage-y += cbfs_ramstage_loader.c
+romstage-y += load_and_run_ramstage.c
diff --git a/src/lib/loaders/cbfs_ramstage_loader.c b/src/lib/loaders/cbfs_ramstage_loader.c
new file mode 100644
index 0000000000..5d5cc0b0ec
--- /dev/null
+++ b/src/lib/loaders/cbfs_ramstage_loader.c
@@ -0,0 +1,67 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2008-2009 coresystems GmbH
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include <console/console.h>
+#include <cbfs.h>
+#include <arch/stages.h>
+#include <ramstage_loader.h>
+#include <timestamp.h>
+
+#if CONFIG_RELOCATABLE_RAMSTAGE
+#include <rmodule.h>
+
+static void *cbfs_load_ramstage(uint32_t cbmem_id, const char *name,
+				const struct cbmem_entry **cbmem_entry)
+{
+	struct rmod_stage_load rmod_ram = {
+		.cbmem_id = cbmem_id,
+		.name = name,
+	};
+
+	if (rmodule_stage_load_from_cbfs(&rmod_ram)) {
+		printk(BIOS_DEBUG, "Could not load ramstage.\n");
+		return NULL;
+	}
+
+	*cbmem_entry = rmod_ram.cbmem_entry;
+
+	return rmod_ram.entry;
+}
+
+#else /* CONFIG_RELOCATABLE_RAMSTAGE */
+
+static void *cbfs_load_ramstage(uint32_t cbmem_id, const char *name,
+				const struct cbmem_entry **cbmem_entry)
+{
+	void *entry;
+
+	entry = cbfs_load_stage(CBFS_DEFAULT_MEDIA, name);
+
+	if ((void *)entry == (void *) -1)
+		entry = NULL;
+
+	return entry;
+}
+
+#endif /* CONFIG_RELOCATABLE_RAMSTAGE */
+
+const struct ramstage_loader_ops cbfs_ramstage_loader = {
+	.name = "CBFS",
+	.load = cbfs_load_ramstage,
+};
diff --git a/src/lib/loaders/load_and_run_ramstage.c b/src/lib/loaders/load_and_run_ramstage.c
new file mode 100644
index 0000000000..be2be8219c
--- /dev/null
+++ b/src/lib/loaders/load_and_run_ramstage.c
@@ -0,0 +1,100 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2014 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdlib.h>
+#include <console/console.h>
+#include <arch/stages.h>
+#include <cbfs.h>
+#include <cbmem.h>
+#include <ramstage_loader.h>
+#include <romstage_handoff.h>
+#include <timestamp.h>
+
+extern const struct ramstage_loader_ops cbfs_ramstage_loader;
+extern const struct ramstage_loader_ops vboot_ramstage_loader;
+
+static const struct ramstage_loader_ops *loaders[] = {
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+	&vboot_ramstage_loader,
+#endif
+	&cbfs_ramstage_loader,
+};
+
+static const char *ramstage_name = CONFIG_CBFS_PREFIX "/coreboot_ram";
+static const uint32_t ramstage_id = CBMEM_ID_RAMSTAGE;
+
+static void
+load_ramstage(const struct ramstage_loader_ops *ops, struct romstage_handoff *handoff)
+{
+	const struct cbmem_entry *cbmem_entry;
+	void *entry_point;
+
+	timestamp_add_now(TS_START_COPYRAM);
+	entry_point = ops->load(ramstage_id, ramstage_name, &cbmem_entry);
+
+	if (entry_point == NULL)
+		return;
+
+	cache_loaded_ramstage(handoff, cbmem_entry, entry_point);
+
+	timestamp_add_now(TS_END_COPYRAM);
+
+	stage_exit(entry_point);
+}
+
+static void run_ramstage_from_resume(struct romstage_handoff *handoff)
+{
+	void *entry;
+	const struct cbmem_entry *cbmem_entry;
+
+	if (handoff != NULL && handoff->s3_resume) {
+		cbmem_entry = cbmem_entry_find(ramstage_id);
+
+		/* No place to load ramstage. */
+		if (cbmem_entry == NULL)
+			return;
+
+		/* Load the cached ramstage to runtime location. */
+		entry = load_cached_ramstage(handoff, cbmem_entry);
+
+		if (entry != NULL) {
+			print_debug("Jumping to image.\n");
+			stage_exit(entry);
+		}
+	}
+}
+
+void run_ramstage(void)
+{
+	struct romstage_handoff *handoff;
+	const struct ramstage_loader_ops *ops;
+	int i;
+
+	handoff = romstage_handoff_find_or_add();
+
+	run_ramstage_from_resume(handoff);
+
+	for (i = 0; i < ARRAY_SIZE(loaders); i++) {
+		ops = loaders[i];
+		printk(BIOS_DEBUG, "Trying %s ramstage loader.\n", ops->name);
+		load_ramstage(ops, handoff);
+	}
+
+	die("Ramstage was not loaded!\n");
+}
diff --git a/src/soc/intel/baytrail/romstage/romstage.c b/src/soc/intel/baytrail/romstage/romstage.c
index 4d74b53e3e..3ab726df91 100644
--- a/src/soc/intel/baytrail/romstage/romstage.c
+++ b/src/soc/intel/baytrail/romstage/romstage.c
@@ -28,7 +28,6 @@
 #include <ramstage_cache.h>
 #include <romstage_handoff.h>
 #include <timestamp.h>
-#include <vendorcode/google/chromeos/chromeos.h>
 #include <baytrail/gpio.h>
 #include <baytrail/iomap.h>
 #include <baytrail/lpc.h>
@@ -172,9 +171,6 @@ void asmlinkage romstage_after_car(void)
 
 	timestamp_add_now(TS_END_ROMSTAGE);
 
-	/* Run vboot verification if configured. */
-	vboot_verify_firmware(romstage_handoff_find_or_add());
-
 	/* Load the ramstage. */
 	copy_and_run();
 	while (1);
diff --git a/src/vendorcode/google/chromeos/chromeos.h b/src/vendorcode/google/chromeos/chromeos.h
index 5493801a09..0359c91409 100644
--- a/src/vendorcode/google/chromeos/chromeos.h
+++ b/src/vendorcode/google/chromeos/chromeos.h
@@ -46,14 +46,10 @@ int recovery_mode_enabled(void);
 /* functions implemented in vboot.c */
 void init_chromeos(int bootmode);
 
-struct romstage_handoff;
 #if CONFIG_VBOOT_VERIFY_FIRMWARE
-void vboot_verify_firmware(struct romstage_handoff *handoff);
 void *vboot_get_payload(size_t *len);
 /* Returns 0 on success < 0 on error. */
 int vboot_get_handoff_info(void **addr, uint32_t *size);
-#else
-static inline void vboot_verify_firmware(struct romstage_handoff *h) {}
 #endif
 
 #endif
diff --git a/src/vendorcode/google/chromeos/vboot_loader.c b/src/vendorcode/google/chromeos/vboot_loader.c
index cc7c25d873..0c5220a82b 100644
--- a/src/vendorcode/google/chromeos/vboot_loader.c
+++ b/src/vendorcode/google/chromeos/vboot_loader.c
@@ -26,6 +26,7 @@
 #include <console/vtxprintf.h>
 #include <pc80/tpm.h>
 #include <reset.h>
+#include <ramstage_loader.h>
 #include <romstage_handoff.h>
 #include <rmodule.h>
 #include <string.h>
@@ -141,27 +142,52 @@ static void vboot_invoke_wrapper(struct vboot_handoff *vboot_handoff)
 	vboot_run_stub(&context);
 }
 
-static void vboot_load_ramstage(struct vboot_handoff *vboot_handoff,
-                                struct romstage_handoff *handoff)
+static void *vboot_load_ramstage(uint32_t cbmem_id, const char *name,
+				const struct cbmem_entry **cbmem_entry)
 {
+	struct vboot_handoff *vboot_handoff;
 	struct cbfs_stage *stage;
 	const struct firmware_component *fwc;
 	struct rmod_stage_load rmod_load = {
-		.cbmem_id = CBMEM_ID_RAMSTAGE,
-		.name = CONFIG_CBFS_PREFIX "/coreboot_ram",
+		.cbmem_id = cbmem_id,
+		.name = name,
 	};
 
+	timestamp_add_now(TS_START_VBOOT);
+
+	vboot_handoff = cbmem_add(CBMEM_ID_VBOOT_HANDOFF,
+	                          sizeof(*vboot_handoff));
+
+	if (vboot_handoff == NULL) {
+		printk(BIOS_DEBUG, "Could not add vboot_handoff structure.\n");
+		return NULL;
+	}
+
+	memset(vboot_handoff, 0, sizeof(*vboot_handoff));
+
+	vboot_invoke_wrapper(vboot_handoff);
+
+	timestamp_add_now(TS_END_VBOOT);
+
+	/* Take RO firmware path since no RW area was selected. */
+	if (vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_A &&
+	    vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_B) {
+		printk(BIOS_DEBUG, "No RW firmware selected: 0x%08x\n",
+		       vboot_handoff->selected_firmware);
+		return NULL;
+	}
+
 	if (CONFIG_VBOOT_RAMSTAGE_INDEX >= MAX_PARSED_FW_COMPONENTS) {
 		printk(BIOS_ERR, "Invalid ramstage index: %d\n",
 		       CONFIG_VBOOT_RAMSTAGE_INDEX);
-		return;
+		return NULL;
 	}
 
 	/* Check for invalid address. */
 	fwc = &vboot_handoff->components[CONFIG_VBOOT_RAMSTAGE_INDEX];
 	if (fwc->address == 0) {
 		printk(BIOS_DEBUG, "RW ramstage image address invalid.\n");
-		return;
+		return NULL;
 	}
 
 	printk(BIOS_DEBUG, "RW ramstage image at 0x%08x, 0x%08x bytes.\n",
@@ -169,53 +195,18 @@ static void vboot_load_ramstage(struct vboot_handoff *vboot_handoff,
 
 	stage = (void *)fwc->address;
 
-	timestamp_add_now(TS_START_COPYRAM);
-
 	if (rmodule_stage_load(&rmod_load, stage)) {
 		vboot_handoff->selected_firmware = VB_SELECT_FIRMWARE_READONLY;
 		printk(BIOS_DEBUG, "Could not load ramstage region.\n");
-		return;
+		return NULL;
 	}
 
-	cache_loaded_ramstage(handoff, rmod_load.cbmem_entry, rmod_load.entry);
-
-	timestamp_add_now(TS_END_COPYRAM);
+	*cbmem_entry = rmod_load.cbmem_entry;
 
-	stage_exit(rmod_load.entry);
+	return rmod_load.entry;
 }
 
-void vboot_verify_firmware(struct romstage_handoff *handoff)
-{
-	struct vboot_handoff *vboot_handoff;
-
-	/* Don't go down verified boot path on S3 resume. */
-	if (handoff != NULL && handoff->s3_resume)
-		return;
-
-	timestamp_add_now(TS_START_VBOOT);
-
-	vboot_handoff = cbmem_add(CBMEM_ID_VBOOT_HANDOFF,
-	                          sizeof(*vboot_handoff));
-
-	if (vboot_handoff == NULL) {
-		printk(BIOS_DEBUG, "Could not add vboot_handoff structure.\n");
-		return;
-	}
-
-	memset(vboot_handoff, 0, sizeof(*vboot_handoff));
-
-	vboot_invoke_wrapper(vboot_handoff);
-
-	timestamp_add_now(TS_END_VBOOT);
-
-	/* Take RO firmware path since no RW area was selected. */
-	if (vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_A &&
-	    vboot_handoff->selected_firmware != VB_SELECT_FIRMWARE_B) {
-		printk(BIOS_DEBUG, "No RW firmware selected: 0x%08x\n",
-		       vboot_handoff->selected_firmware);
-		return;
-	}
-
-	/* Load ramstage from the vboot_handoff structure. */
-	vboot_load_ramstage(vboot_handoff, handoff);
-}
+const struct ramstage_loader_ops vboot_ramstage_loader = {
+	.name = "VBOOT",
+	.load = vboot_load_ramstage,
+};