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https://github.com/Telecominfraproject/OpenCellular.git
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bdf7da5b08
source files mainly done by Randall. Signed-off-by: Randall Spangler <rspangler@chromium.org> Change-Id: Iaff83a842b17f3350fb6f2a3f1597ad4c29bd12a
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Verified boot module for Chrome EC */
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#include "console.h"
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#include "system.h"
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#include "uart.h"
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#include "util.h"
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#include "vboot.h"
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#define SCRATCHPAD_EMPTY 0
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#define SCRATCHPAD_REQUEST_A 0xb00daaaa
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#define SCRATCHPAD_REQUEST_B 0xb00dbbbb
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#define SCRATCHPAD_SELECTED_A 0x0000d1da
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#define SCRATCHPAD_SELECTED_B 0x0000d1db
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#define SCRATCHPAD_SELECTED_RO 0x0000d1d0
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#define SCRATCHPAD_FAILED_A 0x0000eeea
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#define SCRATCHPAD_FAILED_B 0x0000eeeb
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/* Jumps to one of the RW images if necessary. */
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static void jump_to_other_image(void)
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{
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int s;
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if (system_get_image_copy() != SYSTEM_IMAGE_RO)
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return; /* Not in RO firmware, so ignore scratchpad */
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if (system_get_reset_cause() != SYSTEM_RESET_SOFT_COLD) {
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/* In RO firmware, but not because of a warm boot.
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* Stay in RO regardless of scratchpad, and clear it
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* so we don't use it on the next boot. */
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system_set_scratchpad(SCRATCHPAD_EMPTY);
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return;
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}
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/* TODO: check recovery button; if it's pressed, stay in RO */
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/* Check for a scratchpad value we recognize. Clear the
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* scratchpad before jumping, so we only do this once. */
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s = system_get_scratchpad();
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if (s == SCRATCHPAD_REQUEST_A) {
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system_set_scratchpad(SCRATCHPAD_SELECTED_A);
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system_run_image_copy(SYSTEM_IMAGE_RW_A);
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/* Shouldn't normally return; if we did, flag error */
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system_set_scratchpad(SCRATCHPAD_FAILED_A);
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} else if (s == SCRATCHPAD_REQUEST_B) {
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system_set_scratchpad(SCRATCHPAD_SELECTED_B);
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system_run_image_copy(SYSTEM_IMAGE_RW_B);
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/* Shouldn't normally return; if we did, flag error */
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system_set_scratchpad(SCRATCHPAD_FAILED_B);
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} else {
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system_set_scratchpad(SCRATCHPAD_EMPTY);
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}
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}
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/*****************************************************************************/
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/* Console commands */
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static int command_reboot(int argc, char **argv)
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{
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/* Handle request to boot to a specific image */
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if (argc >= 2) {
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if (!strcasecmp(argv[1], "a")) {
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uart_puts("Rebooting to image A!\n\n\n");
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system_set_scratchpad(SCRATCHPAD_REQUEST_A);
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} else if (!strcasecmp(argv[1], "b")) {
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uart_puts("Rebooting to image B!\n\n\n");
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system_set_scratchpad(SCRATCHPAD_REQUEST_B);
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} else {
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uart_puts("Usage: reboot [ A | B ]\n");
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return EC_ERROR_UNKNOWN;
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}
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} else {
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uart_puts("Rebooting to RO!\n\n\n");
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}
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uart_flush_output();
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/* TODO - param to specify warm/cold */
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system_reset(1);
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return EC_SUCCESS;
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}
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static const struct console_command console_commands[] = {
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{"reboot", command_reboot},
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};
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static const struct console_group command_group = {
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"Verified boot", console_commands, ARRAY_SIZE(console_commands)
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};
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/*****************************************************************************/
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/* Initialization */
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int vboot_pre_init(void)
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{
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/* Jump to a different image if necessary; this may not return */
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jump_to_other_image();
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return EC_SUCCESS;
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}
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int vboot_init(void)
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{
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/* Register our internal commands */
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console_register_commands(&command_group);
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return EC_SUCCESS;
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}
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