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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* 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.
*/
#define NEED_VB20_INTERNALS /* Peeking into vb2_shared_data */
#include <stddef.h>
#include <stdint.h>
#include <vb2_api.h>
#include <arch/stages.h>
#include <assert.h>
#include <bootmode.h>
#include <string.h>
#include <cbmem.h>
#include <console/console.h>
#include <console/vtxprintf.h>
#include <fmap.h>
#include <stdlib.h>
#include <vboot_struct.h>
#include <security/vboot/vbnv.h>
#include <security/vboot/misc.h>
/**
* Sets vboot_handoff based on the information in vb2_shared_data
*/
static void fill_vboot_handoff(struct vboot_handoff *vboot_handoff,
struct vb2_shared_data *vb2_sd)
{
VbSharedDataHeader *vb_sd =
(VbSharedDataHeader *)vboot_handoff->shared_data;
uint32_t *oflags = &vboot_handoff->out_flags;
vb_sd->flags |= VBSD_BOOT_FIRMWARE_VBOOT2;
vboot_handoff->selected_firmware = vb2_sd->fw_slot;
vb_sd->firmware_index = vb2_sd->fw_slot;
vb_sd->magic = VB_SHARED_DATA_MAGIC;
vb_sd->struct_version = VB_SHARED_DATA_VERSION;
vb_sd->struct_size = sizeof(VbSharedDataHeader);
vb_sd->data_size = VB_SHARED_DATA_MIN_SIZE;
vb_sd->data_used = sizeof(VbSharedDataHeader);
vb_sd->fw_version_tpm = vb2_sd->fw_version_secdata;
if (vb2_sd->recovery_reason) {
vb_sd->firmware_index = 0xFF;
if (vb2_sd->flags & VB2_SD_FLAG_MANUAL_RECOVERY)
vb_sd->flags |= VBSD_BOOT_REC_SWITCH_ON;
*oflags |= VB_INIT_OUT_ENABLE_RECOVERY;
*oflags |= VB_INIT_OUT_CLEAR_RAM;
}
if (vb2_sd->flags & VB2_SD_FLAG_DEV_MODE_ENABLED) {
*oflags |= VB_INIT_OUT_ENABLE_DEVELOPER;
*oflags |= VB_INIT_OUT_CLEAR_RAM;
vb_sd->flags |= VBSD_BOOT_DEV_SWITCH_ON;
vb_sd->flags |= VBSD_LF_DEV_SWITCH_ON;
}
/* In vboot1, VBSD_FWB_TRIED is
* set only if B is booted as explicitly requested. Therefore, if B is
* booted because A was found bad, the flag should not be set. It's
* better not to touch it if we can only ambiguously control it. */
/* if (vb2_sd->fw_slot)
vb_sd->flags |= VBSD_FWB_TRIED; */
/* copy kernel subkey if it's found */
if (vb2_sd->workbuf_preamble_size) {
struct vb2_fw_preamble *fp;
uintptr_t dst, src;
printk(BIOS_INFO, "Copying FW preamble\n");
fp = (struct vb2_fw_preamble *)((uintptr_t)vb2_sd +
vb2_sd->workbuf_preamble_offset);
src = (uintptr_t)&fp->kernel_subkey +
fp->kernel_subkey.key_offset;
dst = (uintptr_t)vb_sd + sizeof(VbSharedDataHeader);
assert(dst + fp->kernel_subkey.key_size <=
(uintptr_t)vboot_handoff + sizeof(*vboot_handoff));
memcpy((void *)dst, (void *)src,
fp->kernel_subkey.key_size);
vb_sd->data_used += fp->kernel_subkey.key_size;
vb_sd->kernel_subkey.key_offset =
dst - (uintptr_t)&vb_sd->kernel_subkey;
vb_sd->kernel_subkey.key_size = fp->kernel_subkey.key_size;
vb_sd->kernel_subkey.algorithm = fp->kernel_subkey.algorithm;
vb_sd->kernel_subkey.key_version =
fp->kernel_subkey.key_version;
}
vb_sd->recovery_reason = vb2_sd->recovery_reason;
}
void vboot_fill_handoff(void)
{
struct vboot_handoff *vh;
struct vb2_shared_data *sd;
sd = vboot_get_shared_data();
sd->workbuf_hash_offset = 0;
sd->workbuf_hash_size = 0;
printk(BIOS_INFO, "creating vboot_handoff structure\n");
vh = cbmem_add(CBMEM_ID_VBOOT_HANDOFF, sizeof(*vh));
if (vh == NULL)
/* we don't need to failover gracefully here because this
* shouldn't happen with the image that has passed QA. */
die("failed to allocate vboot_handoff structure\n");
memset(vh, 0, sizeof(*vh));
/* needed until we finish transtion to vboot2 for kernel verification */
fill_vboot_handoff(vh, sd);
}
/*
* For platforms that employ VBOOT_STARTS_IN_ROMSTAGE, the vboot
* verification doesn't happen until after cbmem is brought online.
* Therefore, the vboot results would not be initialized so don't
* automatically add results when cbmem comes online.
*/
#if !CONFIG(VBOOT_STARTS_IN_ROMSTAGE)
static void vb2_fill_handoff_cbmem(int unused)
{
vboot_fill_handoff();
}
ROMSTAGE_CBMEM_INIT_HOOK(vb2_fill_handoff_cbmem)
#endif
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