/* * This file is part of the coreboot project. * * Copyright 2015 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. */ #include <cbfs.h> #include <console/console.h> #include <ec/google/chromeec/ec.h> #include <rmodule.h> #include <security/vboot/misc.h> #include <security/vboot/symbols.h> #include <security/vboot/vboot_common.h> /* Ensure vboot configuration is valid: */ _Static_assert(CONFIG(VBOOT_STARTS_IN_BOOTBLOCK) + CONFIG(VBOOT_STARTS_IN_ROMSTAGE) == 1, "vboot must either start in bootblock or romstage (not both!)"); _Static_assert(!CONFIG(VBOOT_SEPARATE_VERSTAGE) || CONFIG(VBOOT_STARTS_IN_BOOTBLOCK), "stand-alone verstage must start in (i.e. after) bootblock"); _Static_assert(!CONFIG(VBOOT_RETURN_FROM_VERSTAGE) || CONFIG(VBOOT_SEPARATE_VERSTAGE), "return from verstage only makes sense for separate verstages"); int vboot_executed; void vboot_run_logic(void) { if (verification_should_run()) { /* Note: this path is not used for VBOOT_RETURN_FROM_VERSTAGE */ verstage_main(); vboot_executed = 1; } else if (verstage_should_load()) { struct cbfsf file; struct prog verstage = PROG_INIT(PROG_VERSTAGE, CONFIG_CBFS_PREFIX "/verstage"); printk(BIOS_DEBUG, "VBOOT: Loading verstage.\n"); /* load verstage from RO */ if (cbfs_boot_locate(&file, prog_name(&verstage), NULL)) die("failed to load verstage"); cbfs_file_data(prog_rdev(&verstage), &file); if (cbfs_prog_stage_load(&verstage)) die("failed to load verstage"); /* verify and select a slot */ prog_run(&verstage); /* This is not actually possible to hit this condition at * runtime, but this provides a hint to the compiler for dead * code elimination below. */ if (!CONFIG(VBOOT_RETURN_FROM_VERSTAGE)) return; vboot_executed = 1; } } static int vboot_locate(struct region_device *rdev) { struct vb2_context *ctx; /* Don't honor vboot results until the vboot logic has run. */ if (!vboot_logic_executed()) return -1; ctx = vboot_get_context(); if (ctx->flags & VB2_CONTEXT_RECOVERY_MODE) return -1; return vboot_locate_firmware(ctx, rdev); } const struct cbfs_locator vboot_locator = { .name = "VBOOT", .locate = vboot_locate, };