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https://github.com/Telecominfraproject/OpenCellular.git
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031dccad78
This patch makes EC read the slot to verify and jump to from the battery backed up RAM (BBRAM). BUG=b:38462249 BRANCH=none TEST=Boot Fizz Change-Id: I0c78861ea3ccdc45d0aa08e690e3a68f53658409 Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/518255
119 lines
2.3 KiB
C
119 lines
2.3 KiB
C
/* Copyright 2017 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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/*
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* Implementation of EC's boot verification
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*/
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#include "battery.h"
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#include "charge_manager.h"
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#include "chipset.h"
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#include "console.h"
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#include "host_command.h"
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#include "rwsig.h"
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#include "system.h"
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#include "usb_pd.h"
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#include "vboot.h"
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#define CPRINTS(format, args...) cprints(CC_VBOOT, format, ## args)
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enum vboot_ec_slot {
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VBOOT_EC_SLOT_A,
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VBOOT_EC_SLOT_B,
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};
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static int has_matrix_keyboard(void)
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{
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return 0;
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}
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static int is_vboot_ec_supported(void)
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{
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return 0;
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}
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static int is_low_power_ap_boot_supported(void)
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{
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return 0;
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}
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static int verify_slot(int slot)
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{
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/* TODO: Handle slot A and B */
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CPRINTS("Verifying S%d", slot);
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return rwsig_check_signature();
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}
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static int verify_rw(void)
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{
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uint8_t slot;
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/* 1. Read BBRAM to decide which slot to verify */
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if (system_get_bbram(SYSTEM_BBRAM_IDX_TRY_SLOT, &slot)) {
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CPRINTS("Failed to read try slot");
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slot = VBOOT_EC_SLOT_A;
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}
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/* 2. Verify the slot */
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return verify_slot(slot);
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}
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/* Request more power: charging battery or more powerful AC adapter */
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static void request_power(void)
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{
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/* TODO: Blink LED */
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}
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static void request_recovery(void)
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{
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/* TODO: Blink LED */
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}
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static int is_manual_recovery(void)
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{
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return host_get_events() & EC_HOST_EVENT_KEYBOARD_RECOVERY;
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}
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void vboot_ec(void)
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{
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int port = charge_manager_get_active_charge_port();
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if (port >= CONFIG_USB_PD_PORT_COUNT) {
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/* AC is not type-c. No chance to boot. */
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request_power();
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return;
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}
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if (pd_comm_is_enabled(port))
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/* Normal RW boot or unlocked RO boot.
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* Hoping enough power will be supplied after PD negotiation. */
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return;
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/* PD communication is disabled. Probably this is RO image */
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CPRINTS("PD comm disabled");
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if (is_manual_recovery()) {
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if (battery_is_present() || has_matrix_keyboard()) {
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request_power();
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return;
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}
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CPRINTS("Enable C%d PD communication", port);
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pd_comm_enable(port, 1);
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/* TODO: Inform PD task and make it negotiate */
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return;
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}
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if (!is_vboot_ec_supported() && !is_low_power_ap_boot_supported()) {
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request_power();
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return;
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}
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if (verify_rw())
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/* Jump (and reboot) */
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rwsig_jump_now();
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/* Failed to verify RW. Need recovery. */
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request_recovery();
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}
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