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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 The ChromiumOS Authors. All rights reserved.
*
* 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.
*/
#ifndef __VBOOT_MISC_H__
#define __VBOOT_MISC_H__
#include <assert.h>
#include <arch/early_variables.h>
#include <security/vboot/vboot_common.h>
struct vb2_context;
struct vb2_shared_data;
struct selected_region {
uint32_t offset;
uint32_t size;
};
/*
* Stores vboot-related information. selected_region is used by verstage to
* store the location of the selected slot. buffer is used by vboot to store
* its work buffer. vb2_context is contained within this work buffer, and is
* accessible via vboot_get_context() declared below.
* Keep the struct CPU architecture agnostic as it crosses stage boundaries.
*/
struct vboot_working_data {
struct selected_region selected_region;
/* offset of the buffer from the start of this struct */
uint16_t buffer_offset;
};
/*
* Source: security/vboot/common.c
*/
struct vboot_working_data *vboot_get_working_data(void);
struct vb2_context *vboot_get_context(void);
/* Returns 0 on success. < 0 on failure. */
int vboot_get_selected_region(struct region *region);
void vboot_set_selected_region(const struct region *region);
int vboot_is_slot_selected(void);
/*
* Source: security/vboot/vboot_handoff.c
*/
void vboot_fill_handoff(void);
/*
* Source: security/vboot/bootmode.c
*/
void vboot_save_recovery_reason_vbnv(void);
/*
* 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. They are implemented inline for better compile-time
* code elimination.
*/
static inline int verification_should_run(void)
{
if (CONFIG(VBOOT_SEPARATE_VERSTAGE))
return ENV_VERSTAGE;
else if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE))
return ENV_ROMSTAGE;
else if (CONFIG(VBOOT_STARTS_IN_BOOTBLOCK))
return ENV_BOOTBLOCK;
else
dead_code();
}
static inline int verstage_should_load(void)
{
if (CONFIG(VBOOT_SEPARATE_VERSTAGE))
return ENV_BOOTBLOCK;
else
return 0;
}
static inline int vboot_logic_executed(void)
{
extern int vboot_executed; /* should not be globally accessible */
/* If we are in the stage that runs verification, or in the stage that
both loads the verstage and is returned to from it afterwards, we
need to check a global to see if verfication has run. */
if (verification_should_run() ||
(verstage_should_load() && CONFIG(VBOOT_RETURN_FROM_VERSTAGE)))
return car_get_var(vboot_executed);
if (CONFIG(VBOOT_STARTS_IN_BOOTBLOCK)) {
/* All other stages are "after the bootblock" */
return !ENV_BOOTBLOCK;
} else if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE)) {
/* Post-RAM stages are "after the romstage" */
return !ENV_ROMSTAGE_OR_BEFORE;
} else {
dead_code();
}
}
#endif /* __VBOOT_MISC_H__ */
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