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/*
* 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.
*
* 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.
*/
#include <cbfs.h>
#include <cbmem.h>
#include <console/console.h>
#include <program_loading.h>
#include <rmodule.h>
#include <rules.h>
#include <string.h>
#include "misc.h"
#include "../vboot_handoff.h"
#include "../symbols.h"
/* The stage loading code is compiled and entered from multiple stages. The
* helper functions below attempt to provide more clarity on when certain
* code should be called. */
static int verification_should_run(void)
{
if (ENV_VERSTAGE && IS_ENABLED(CONFIG_SEPARATE_VERSTAGE))
return 1;
if (!IS_ENABLED(CONFIG_SEPARATE_VERSTAGE)) {
if (ENV_ROMSTAGE &&
IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE))
return 1;
if (ENV_BOOTBLOCK &&
IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK))
return 1;
}
return 0;
}
static int verstage_should_load(void)
{
if (!IS_ENABLED(CONFIG_SEPARATE_VERSTAGE))
return 0;
if (ENV_ROMSTAGE && IS_ENABLED(CONFIG_VBOOT_STARTS_IN_ROMSTAGE))
return 1;
if (ENV_BOOTBLOCK && IS_ENABLED(CONFIG_VBOOT_STARTS_IN_BOOTBLOCK))
return 1;
return 0;
}
static void init_vb2_working_data(void)
{
struct vb2_working_data *wd;
size_t work_size;
work_size = vb2_working_data_size();
wd = vboot_get_working_data();
memset(wd, 0, work_size);
/*
* vboot prefers 16-byte alignment. This takes away 16 bytes
* from the VBOOT2_WORK region, but the vboot devs said that's okay.
*/
wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16);
wd->buffer_size = work_size - wd->buffer_offset;
}
static int vboot_loader_active(struct prog *prog)
{
struct vb2_working_data *wd;
int run_verification;
run_verification = verification_should_run();
if (run_verification) {
init_vb2_working_data();
verstage_main();
} else if (verstage_should_load()) {
struct prog verstage = {
.type = PROG_VERSTAGE,
.name = CONFIG_CBFS_PREFIX "/verstage",
};
printk(BIOS_DEBUG, "VBOOT: Loading verstage.\n");
/* load verstage from RO */
if (cbfs_boot_locate(&verstage.rdev, verstage.name, NULL) ||
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 (!IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE))
return 0;
}
/* Fill in vboot handoff structure before moving to ramstage so all
* downstream users have access to vboot results. */
if (ENV_ROMSTAGE)
vboot_fill_handoff();
wd = vboot_get_working_data();
if (vboot_is_slot_selected(wd))
return 1;
return 0;
}
static int vboot_locate_by_components(const struct region_device *fw_main,
struct prog *prog)
{
struct vboot_components *fw_info;
size_t metadata_sz;
size_t offset;
size_t size;
struct region_device *fw = &prog->rdev;
int fw_index = 0;
if (prog->type == PROG_ROMSTAGE)
fw_index = CONFIG_VBOOT_ROMSTAGE_INDEX;
else if (prog->type == PROG_RAMSTAGE)
fw_index = CONFIG_VBOOT_RAMSTAGE_INDEX;
else if (prog->type == PROG_PAYLOAD)
fw_index = CONFIG_VBOOT_BOOT_LOADER_INDEX;
else if (prog->type == PROG_REFCODE)
fw_index = CONFIG_VBOOT_REFCODE_INDEX;
else if (prog->type == PROG_BL31)
fw_index = CONFIG_VBOOT_BL31_INDEX;
else
die("Invalid program type for vboot.");
metadata_sz = sizeof(*fw_info);
metadata_sz += MAX_PARSED_FW_COMPONENTS * sizeof(fw_info->entries[0]);
fw_info = rdev_mmap(fw_main, 0, metadata_sz);
if (fw_info == NULL) {
printk(BIOS_INFO, "No component metadata.\n");
return -1;
}
if (fw_index >= fw_info->num_components) {
printk(BIOS_INFO, "invalid index: %d\n", fw_index);
rdev_munmap(fw_main, fw_info);
return -1;
}
offset = fw_info->entries[fw_index].offset;
size = fw_info->entries[fw_index].size;
rdev_munmap(fw_main, fw_info);
if (rdev_chain(fw, fw_main, offset, size)) {
printk(BIOS_INFO, "invalid offset or size\n");
return -1;
}
return 0;
}
static int vboot_locate_by_multi_cbfs(const struct region_device *fw_main,
struct prog *prog)
{
struct cbfsd cbfs;
struct region_device rdev;
struct cbfs_props props;
if (cbfs_boot_region_properties(&props))
return -1;
if (rdev_chain(&rdev, fw_main, props.offset, props.size))
return -1;
cbfs.rdev = &rdev;
cbfs.align = props.align;
return cbfs_locate(&prog->rdev, &cbfs, prog->name, NULL);
}
static int vboot_prog_locate(const struct region_device *fw_main,
struct prog *prog)
{
if (IS_ENABLED(CONFIG_MULTIPLE_CBFS_INSTANCES))
return vboot_locate_by_multi_cbfs(fw_main, prog);
else
return vboot_locate_by_components(fw_main, prog);
}
/* This function is only called when vboot_loader_active() returns 1. That
* means we are taking vboot paths. */
static int vboot_locate(struct prog *prog)
{
struct vb2_working_data *wd;
struct region_device fw_main;
/* Code size optimization. We'd never actually get called under the
* followin cirumstances because verstage was loaded and ran -- never
* returning. */
if (verstage_should_load() && !IS_ENABLED(CONFIG_RETURN_FROM_VERSTAGE))
return 0;
wd = vboot_get_working_data();
if (vb2_get_selected_region(wd, &fw_main))
die("failed to reference selected region\n");
return vboot_prog_locate(&fw_main, prog);
}
const struct prog_loader_ops vboot_loader = {
.name = "VBOOT",
.is_loader_active = vboot_loader_active,
.locate = vboot_locate,
};
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