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/* Copyright 2017 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/*
* Implementation of EC's boot verification
*/
#include "battery.h"
#include "charge_manager.h"
#include "chipset.h"
#include "console.h"
#include "host_command.h"
#include "rwsig.h"
#include "system.h"
#include "usb_pd.h"
#include "vboot.h"
#define CPRINTS(format, args...) cprints(CC_VBOOT, format, ## args)
enum vboot_ec_slot {
VBOOT_EC_SLOT_A,
VBOOT_EC_SLOT_B,
};
static int has_matrix_keyboard(void)
{
return 0;
}
static int is_vboot_ec_supported(void)
{
return 0;
}
static int is_low_power_ap_boot_supported(void)
{
return 0;
}
static int verify_slot(int slot)
{
/* TODO: Handle slot A and B */
CPRINTS("Verifying S%d", slot);
return rwsig_check_signature();
}
static int verify_rw(void)
{
uint8_t slot;
/* 1. Read BBRAM to decide which slot to verify */
if (system_get_bbram(SYSTEM_BBRAM_IDX_TRY_SLOT, &slot)) {
CPRINTS("Failed to read try slot");
slot = VBOOT_EC_SLOT_A;
}
/* 2. Verify the slot */
return verify_slot(slot);
}
/* Request more power: charging battery or more powerful AC adapter */
static void request_power(void)
{
/* TODO: Blink LED */
}
static void request_recovery(void)
{
/* TODO: Blink LED */
}
static int is_manual_recovery(void)
{
return host_get_events() & EC_HOST_EVENT_KEYBOARD_RECOVERY;
}
void vboot_ec(void)
{
int port = charge_manager_get_active_charge_port();
if (port >= CONFIG_USB_PD_PORT_COUNT) {
/* AC is not type-c. No chance to boot. */
request_power();
return;
}
if (pd_comm_is_enabled(port))
/* Normal RW boot or unlocked RO boot.
* Hoping enough power will be supplied after PD negotiation. */
return;
/* PD communication is disabled. Probably this is RO image */
CPRINTS("PD comm disabled");
if (is_manual_recovery()) {
if (battery_is_present() || has_matrix_keyboard()) {
request_power();
return;
}
CPRINTS("Enable C%d PD communication", port);
pd_comm_enable(port, 1);
/* TODO: Inform PD task and make it negotiate */
return;
}
if (!is_vboot_ec_supported() && !is_low_power_ap_boot_supported()) {
request_power();
return;
}
if (verify_rw())
/* Jump (and reboot) */
rwsig_jump_now();
/* Failed to verify RW. Need recovery. */
request_recovery();
}
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