firmware/lib/vboot_ui_legacy_common.c

/* Copyright 2018 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.
 *
 * High-level firmware wrapper API - user interface for RW firmware
 */

#include "2common.h"
#include "2misc.h"
#include "2sysincludes.h"
#include "vboot_api.h"
#include "vboot_kernel.h"
#include "vboot_test.h"
#include "vboot_ui_legacy_common.h"

static enum {
	POWER_BUTTON_HELD_SINCE_BOOT = 0,
	POWER_BUTTON_RELEASED,
	POWER_BUTTON_PRESSED,  /* Must have been previously released */
} power_button_state;

void vb2_reset_power_button(void) {
	power_button_state = POWER_BUTTON_HELD_SINCE_BOOT;
}

void vb2_error_beep(enum vb2_beep_type beep)
{
	switch (beep) {
	case VB_BEEP_FAILED:
		VbExBeep(250, 200);
		break;
	default:
	case VB_BEEP_NOT_ALLOWED:
		VbExBeep(120, 400);
		VbExSleepMs(120);
		VbExBeep(120, 400);
		break;
	}
}

void vb2_error_notify(const char *print_msg,
		      const char *log_msg,
		      enum vb2_beep_type beep)
{
	if (print_msg)
		VbExDisplayDebugInfo(print_msg, 0);
	if (!log_msg)
		log_msg = print_msg;
	if (log_msg)
		VB2_DEBUG(log_msg);
	vb2_error_beep(beep);
}

void vb2_error_no_altfw(void)
{
	VB2_DEBUG("Legacy boot is disabled\n");
	VbExDisplayDebugInfo("WARNING: Booting legacy BIOS has not been "
			     "enabled. Refer to the developer-mode "
			     "documentation for details.\n", 0);
	vb2_error_beep(VB_BEEP_NOT_ALLOWED);
}

void vb2_try_altfw(struct vb2_context *ctx, int allowed,
		   enum VbAltFwIndex_t altfw_num)
{
	if (!allowed) {
		vb2_error_no_altfw();
		return;
	}

	if (vb2ex_commit_data(ctx)) {
		vb2_error_notify("Error committing data on legacy boot.\n",
				 NULL, VB_BEEP_FAILED);
		return;
	}

	/* Will not return if successful */
	VbExLegacy(altfw_num);

	vb2_error_notify("Legacy boot failed. Missing BIOS?\n", NULL,
			 VB_BEEP_FAILED);
}

int vb2_want_shutdown(struct vb2_context *ctx, uint32_t key)
{
	struct vb2_gbb_header *gbb = vb2_get_gbb(ctx);
	uint32_t shutdown_request = VbExIsShutdownRequested();

	/*
	 * Ignore power button push until after we have seen it released.
	 * This avoids shutting down immediately if the power button is still
	 * being held on startup. After we've recognized a valid power button
	 * push then don't report the event until after the button is released.
	 */
	if (shutdown_request & VB_SHUTDOWN_REQUEST_POWER_BUTTON) {
		shutdown_request &= ~VB_SHUTDOWN_REQUEST_POWER_BUTTON;
		if (power_button_state == POWER_BUTTON_RELEASED)
			power_button_state = POWER_BUTTON_PRESSED;
	} else {
		if (power_button_state == POWER_BUTTON_PRESSED)
			shutdown_request |= VB_SHUTDOWN_REQUEST_POWER_BUTTON;
		power_button_state = POWER_BUTTON_RELEASED;
	}

	if (key == VB_BUTTON_POWER_SHORT_PRESS)
		shutdown_request |= VB_SHUTDOWN_REQUEST_POWER_BUTTON;

	/* If desired, ignore shutdown request due to lid closure. */
	if (gbb->flags & VB2_GBB_FLAG_DISABLE_LID_SHUTDOWN)
		shutdown_request &= ~VB_SHUTDOWN_REQUEST_LID_CLOSED;

	return shutdown_request;
}