vboot2: separate verstage from bootblock

With CONFIG_RETURN_FROM_VERSTAGE false, the verstage loads the romstage over
the bootblock, then exits to the romstage. this is necessary for some SOC
(e.g. tegra124) which runs the bootblock on a different architecture.

With CONFIG_RETURN_FROM_VERSTAGE true, the verstage returns to the bootblock.
Then, the bootblock loads the romstage over the verstage and exits to the
romstage. this is probably necessary for some SOC (e.g. rockchip) which does not
have SRAM big enough to fit the verstage and the romstage at the same time.

BUG=none
TEST=Built Blaze with USE=+/-vboot2. Ran faft on Blaze.
BRANCH=none
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Change-Id: I673945c5e21afc800d523fbb25d49fdc83693544
Original-Reviewed-on: https://chromium-review.googlesource.com/212365
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>

Note: This purposefully is probably broken in vendorcode/google/chromeos
as I'm just trying to set a base for dropping more patches in. The vboot
paths will have to change from how they are currently constructed.

(cherry picked from commit 4fa17395113d86445660091413ecb005485f8014)
Signed-off-by: Aaron Durbin <adurbin@chromium.org>

Change-Id: I9117434ce99695f9b7021a06196d864f180df5c9
Reviewed-on: http://review.coreboot.org/8881
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/vendorcode/google/chromeos/chromeos.c

@@ -0,0 +1,284 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
+ *
+ * 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 <stddef.h>
+#include <string.h>
+#include "chromeos.h"
+#if CONFIG_VBOOT_VERIFY_FIRMWARE || CONFIG_VBOOT2_VERIFY_FIRMWARE
+#include "fmap.h"
+#include "vboot_handoff.h"
+#include <reset.h>
+#endif
+#include <boot/coreboot_tables.h>
+#include <cbfs.h>
+#include <cbmem.h>
+#include <console/console.h>
+
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+static int vboot_enable_developer(void)
+{
+	struct vboot_handoff *vbho;
+
+	vbho = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vbho == NULL) {
+		printk(BIOS_ERR, "%s: Couldn't find vboot_handoff structure!\n",
+		        __func__);
+		return 0;
+	}
+
+	return !!(vbho->init_params.out_flags & VB_INIT_OUT_ENABLE_DEVELOPER);
+}
+
+static int vboot_enable_recovery(void)
+{
+	struct vboot_handoff *vbho;
+
+	vbho = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vbho == NULL)
+		return 0;
+
+	return !!(vbho->init_params.out_flags & VB_INIT_OUT_ENABLE_RECOVERY);
+}
+#else
+static inline int vboot_enable_developer(void) { return 0; }
+static inline int vboot_enable_recovery(void) { return 0; }
+#endif
+
+int developer_mode_enabled(void)
+{
+	return get_developer_mode_switch() || vboot_enable_developer();
+}
+
+int recovery_mode_enabled(void)
+{
+	/*
+	 * This is called in multiple places and has to detect
+	 * recovery mode triggered from the EC and via shared
+	 * recovery reason set with crossystem.
+	 *
+	 * If shared recovery reason is set:
+	 * - before VbInit then get_recovery_mode_from_vbnv() is true
+	 * - after VbInit then vboot_enable_recovery() is true
+	 *
+	 * Otherwise the mainboard handler for get_recovery_mode_switch()
+	 * will detect recovery mode initiated by the EC.
+	 */
+	return get_recovery_mode_switch() || get_recovery_mode_from_vbnv() ||
+		vboot_enable_recovery();
+}
+
+int __attribute__((weak)) clear_recovery_mode_switch(void)
+{
+	// Can be implemented by a mainboard
+	return 0;
+}
+
+int vboot_skip_display_init(void)
+{
+#if CONFIG_VBOOT_VERIFY_FIRMWARE
+	struct vboot_handoff *vbho;
+
+	vbho = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vbho == NULL)
+		return 0;
+
+	return !(vbho->init_params.out_flags & VB_INIT_OUT_ENABLE_DISPLAY);
+#else
+	return 0;
+#endif
+}
+
+#ifdef __PRE_RAM__
+void __attribute__((weak)) save_chromeos_gpios(void)
+{
+	// Can be implemented by a mainboard
+}
+
+int __attribute((weak)) vboot_get_sw_write_protect(void)
+{
+	// Can be implemented by a platform / mainboard
+	return 0;
+}
+#endif
+
+#if CONFIG_VBOOT_VERIFY_FIRMWARE || CONFIG_VBOOT2_VERIFY_FIRMWARE
+void vboot_locate_region(const char *name, struct vboot_region *region)
+{
+	region->size = find_fmap_entry(name, (void **)&region->offset_addr);
+}
+
+void *vboot_get_region(uintptr_t offset_addr, size_t size, void *dest)
+{
+	if (IS_ENABLED(CONFIG_SPI_FLASH_MEMORY_MAPPED)) {
+		if (dest != NULL)
+			return memcpy(dest, (void *)offset_addr, size);
+		else
+			return (void *)offset_addr;
+	} else {
+		struct cbfs_media default_media, *media = &default_media;
+		void *cache;
+
+		init_default_cbfs_media(media);
+		media->open(media);
+		if (dest != NULL) {
+			cache = dest;
+			if (media->read(media, dest, offset_addr, size) != size)
+				cache = NULL;
+		} else {
+			cache = media->map(media, offset_addr, size);
+			if (cache == CBFS_MEDIA_INVALID_MAP_ADDRESS)
+				cache = NULL;
+		}
+		media->close(media);
+		return cache;
+	}
+}
+
+int vboot_get_handoff_info(void **addr, uint32_t *size)
+{
+	struct vboot_handoff *vboot_handoff;
+
+	vboot_handoff = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vboot_handoff == NULL)
+		return -1;
+
+	*addr = vboot_handoff;
+	*size = sizeof(*vboot_handoff);
+	return 0;
+}
+
+/* This will leak a mapping of a fw region */
+struct vboot_components *vboot_locate_components(struct vboot_region *region)
+{
+	size_t req_size;
+	struct vboot_components *vbc;
+
+	req_size = sizeof(*region);
+	req_size += sizeof(struct vboot_component_entry) *
+			MAX_PARSED_FW_COMPONENTS;
+
+	vbc = vboot_get_region(region->offset_addr, req_size, NULL);
+	if (vbc && vbc->num_components > MAX_PARSED_FW_COMPONENTS)
+		vbc = NULL;
+
+	return vbc;
+}
+
+void *vboot_get_payload(int *len)
+{
+	struct vboot_handoff *vboot_handoff;
+	struct firmware_component *fwc;
+
+	vboot_handoff = cbmem_find(CBMEM_ID_VBOOT_HANDOFF);
+
+	if (vboot_handoff == NULL)
+		return NULL;
+
+	if (CONFIG_VBOOT_BOOT_LOADER_INDEX >= MAX_PARSED_FW_COMPONENTS) {
+		printk(BIOS_ERR, "Invalid boot loader index: %d\n",
+		       CONFIG_VBOOT_BOOT_LOADER_INDEX);
+		return NULL;
+	}
+
+	fwc = &vboot_handoff->components[CONFIG_VBOOT_BOOT_LOADER_INDEX];
+
+	/* If payload size is zero fall back to cbfs path. */
+	if (fwc->size == 0)
+		return NULL;
+
+	if (len != NULL)
+		*len = fwc->size;
+
+	printk(BIOS_DEBUG, "Booting 0x%x byte verified payload at 0x%08x.\n",
+	       fwc->size, fwc->address);
+
+	/* This will leak a mapping. */
+	return vboot_get_region(fwc->address, fwc->size, NULL);
+}
+#endif
+
+#if CONFIG_VBOOT2_VERIFY_FIRMWARE
+void *vboot_load_stage(int stage_index,
+		       struct vboot_region *fw_main,
+		       struct vboot_components *fw_info)
+{
+	struct cbfs_stage *stage;
+	uint32_t fc_addr;
+	uint32_t fc_size;
+
+	if (stage_index >= fw_info->num_components) {
+		printk(BIOS_INFO, "invalid stage index\n");
+		return NULL;
+	}
+
+	fc_addr = fw_main->offset_addr + fw_info->entries[stage_index].offset;
+	fc_size = fw_info->entries[stage_index].size;
+	if (fc_size == 0 ||
+	    fc_addr + fc_size > fw_main->offset_addr + fw_main->size) {
+		printk(BIOS_INFO, "invalid stage address or size\n");
+		return NULL;
+	}
+
+	/* Loading to cbfs cache. This stage data must be retained until it's
+	 * decompressed. */
+	stage = vboot_get_region(fc_addr, fc_size, NULL);
+
+	if (stage == NULL) {
+		printk(BIOS_INFO, "failed to load a stage\n");
+		return NULL;
+	}
+
+	/* Stages rely the below clearing so that the bss is initialized. */
+	memset((void *) (uintptr_t)stage->load, 0, stage->memlen);
+
+	if (cbfs_decompress(stage->compression,
+			    (unsigned char *)stage + sizeof(*stage),
+			    (void *) (uintptr_t) stage->load,
+			    stage->len)) {
+		printk(BIOS_INFO, "failed to decompress a stage\n");
+		return NULL;
+	}
+
+	return (void *)(uintptr_t)stage->entry;
+}
+
+struct vb2_working_data * const vboot_get_working_data(void)
+{
+	return (struct vb2_working_data *)CONFIG_VBOOT_WORK_BUFFER_ADDRESS;
+}
+
+int vboot_is_slot_selected(struct vb2_working_data *wd)
+{
+	return wd->selected_region.size > 0;
+}
+
+int vboot_is_readonly_path(struct vb2_working_data *wd)
+{
+	return wd->selected_region.size == 0;
+}
+
+void vboot_reboot(void)
+{
+	hard_reset();
+}
+#endif