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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.
*/
#include <assert.h>
#include <cbmem.h>
#include <console/console.h>
#include <fmap.h>
#include <stdint.h>
#include <string.h>
#include <symbols.h>
#include <vb2_api.h>
#include <security/vboot/misc.h>
#include <security/vboot/symbols.h>
#include <security/vboot/vboot_common.h>
static struct vb2_context *vboot_ctx CAR_GLOBAL;
struct vboot_working_data *vboot_get_working_data(void)
{
struct vboot_working_data *wd = NULL;
if (cbmem_possibly_online())
wd = cbmem_find(CBMEM_ID_VBOOT_WORKBUF);
if (wd == NULL && CONFIG(VBOOT_STARTS_IN_BOOTBLOCK) &&
preram_symbols_available())
wd = (struct vboot_working_data *)_vboot2_work;
assert(wd != NULL);
return wd;
}
static inline void *vboot_get_workbuf(struct vboot_working_data *wd)
{
return (void *)((uintptr_t)wd + wd->buffer_offset);
}
struct vb2_context *vboot_get_context(void)
{
struct vb2_context **vboot_ctx_ptr = car_get_var_ptr(&vboot_ctx);
struct vboot_working_data *wd;
/* Return if context has already been initialized/restored. */
if (*vboot_ctx_ptr)
return *vboot_ctx_ptr;
wd = vboot_get_working_data();
/* Restore context from a previous stage. */
if (vboot_logic_executed()) {
assert(vb2api_reinit(vboot_get_workbuf(wd),
vboot_ctx_ptr) == VB2_SUCCESS);
return *vboot_ctx_ptr;
}
assert(verification_should_run());
/*
* vboot prefers 16-byte alignment. This takes away 16 bytes
* from the VBOOT2_WORK region, but the vboot devs said that's okay.
*/
memset(wd, 0, sizeof(*wd));
wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16);
/* Initialize vb2_shared_data and friends. */
assert(vb2api_init(vboot_get_workbuf(wd),
VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE -
wd->buffer_offset,
vboot_ctx_ptr) == VB2_SUCCESS);
return *vboot_ctx_ptr;
}
int vboot_locate_firmware(const struct vb2_context *ctx,
struct region_device *fw)
{
const char *name;
if (vboot_is_firmware_slot_a(ctx))
name = "FW_MAIN_A";
else
name = "FW_MAIN_B";
return fmap_locate_area_as_rdev(name, fw);
}
#if CONFIG(VBOOT_STARTS_IN_BOOTBLOCK)
/*
* For platforms that do not employ VBOOT_STARTS_IN_ROMSTAGE, vboot
* verification occurs before CBMEM is brought online, using pre-RAM.
* In order to make vboot data structures available downstream, copy
* vboot_working_data from SRAM/CAR into CBMEM.
*/
static void vboot_migrate_cbmem(int unused)
{
const size_t cbmem_size = VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE;
struct vboot_working_data *wd_preram =
(struct vboot_working_data *)_vboot2_work;
struct vboot_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF, cbmem_size);
assert(wd_cbmem != NULL);
memcpy(wd_cbmem, wd_preram, sizeof(struct vboot_working_data));
vb2api_relocate(vboot_get_workbuf(wd_cbmem),
vboot_get_workbuf(wd_preram),
cbmem_size - wd_cbmem->buffer_offset,
car_get_var_ptr(&vboot_ctx));
}
ROMSTAGE_CBMEM_INIT_HOOK(vboot_migrate_cbmem)
#else
static void vboot_setup_cbmem(int unused)
{
struct vboot_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF,
VB2_KERNEL_WORKBUF_RECOMMENDED_SIZE);
assert(wd_cbmem != NULL);
}
ROMSTAGE_CBMEM_INIT_HOOK(vboot_setup_cbmem)
#endif
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