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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 <reset.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>
struct selected_region {
uint32_t offset;
uint32_t size;
};
/*
* this is placed at the start of the vboot work buffer. selected_region is used
* for the verstage to return the location of the selected slot. buffer is used
* by the vboot2 core. Keep the struct CPU architecture agnostic as it crosses
* stage boundaries.
*/
struct vb2_working_data {
struct selected_region selected_region;
/* offset of the buffer from the start of this struct */
uint32_t buffer_offset;
uint32_t buffer_size;
};
/* TODO(kitching): Use VB2_FIRMWARE_WORKBUF_RECOMMENDED_SIZE instead. */
static size_t vb2_working_data_size(void)
{
if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE))
return 12 * KiB;
else if (CONFIG(VBOOT_STARTS_IN_BOOTBLOCK) &&
preram_symbols_available())
return REGION_SIZE(vboot2_work);
die("impossible!");
}
static struct vb2_working_data * const vb2_get_working_data(void)
{
struct vb2_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 vb2_working_data *)_vboot2_work;
assert(wd != NULL);
return wd;
}
void vb2_init_work_context(struct vb2_context *ctx)
{
struct vb2_working_data *wd;
/* First initialize the working data struct. */
wd = vb2_get_working_data();
memset(wd, 0, sizeof(struct vb2_working_data));
/*
* vboot prefers 16-byte alignment. This takes away 16 bytes
* from the VBOOT2_WORK region, but the vboot devs said that's okay.
*/
wd->buffer_offset = ALIGN_UP(sizeof(*wd), 16);
wd->buffer_size = vb2_working_data_size() - wd->buffer_offset;
/* Initialize the vb2_context. */
memset(ctx, 0, sizeof(*ctx));
ctx->workbuf = (void *)vb2_get_shared_data();
ctx->workbuf_size = wd->buffer_size;
}
void vb2_finalize_work_context(struct vb2_context *ctx)
{
/*
* Shrink buffer_size so that vb2_migrate_cbmem knows how much
* of vb2_working_data needs to be copied into CBMEM (if applicable),
* and so that downstream users know how much of the workbuf is
* currently used.
*/
vb2_get_working_data()->buffer_size = ctx->workbuf_used;
}
struct vb2_shared_data *vb2_get_shared_data(void)
{
struct vb2_working_data *wd = vb2_get_working_data();
return (void *)((uintptr_t)wd + wd->buffer_offset);
}
int vb2_get_selected_region(struct region *region)
{
const struct selected_region *reg =
&vb2_get_working_data()->selected_region;
if (reg == NULL)
return -1;
if (reg->offset == 0 && reg->size == 0)
return -1;
region->offset = reg->offset;
region->size = reg->size;
return 0;
}
void vb2_set_selected_region(const struct region *region)
{
struct selected_region *reg = &vb2_get_working_data()->selected_region;
assert(reg != NULL);
reg->offset = region_offset(region);
reg->size = region_sz(region);
}
int vb2_is_slot_selected(void)
{
struct selected_region *reg = &vb2_get_working_data()->selected_region;
assert(reg != NULL);
return reg->size > 0;
}
#if CONFIG(VBOOT_MIGRATE_WORKING_DATA)
/*
* 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
* vb2_working_data from SRAM/CAR into CBMEM on platforms where this
* memory later becomes unavailable.
*/
static void vb2_migrate_cbmem(int unused)
{
const struct vb2_working_data *wd_preram =
(struct vb2_working_data *)_vboot2_work;
size_t cbmem_size = wd_preram->buffer_offset + wd_preram->buffer_size;
struct vb2_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF, cbmem_size);
printk(BIOS_DEBUG,
"VBOOT: copying vb2_working_data (%zu bytes) to CBMEM...\n",
cbmem_size);
memcpy(wd_cbmem, wd_preram, cbmem_size);
assert(wd_cbmem != NULL);
}
ROMSTAGE_CBMEM_INIT_HOOK(vb2_migrate_cbmem)
#elif CONFIG(VBOOT_STARTS_IN_ROMSTAGE)
static void vb2_setup_cbmem(int unused)
{
struct vb2_working_data *wd_cbmem =
cbmem_add(CBMEM_ID_VBOOT_WORKBUF, vb2_working_data_size());
assert(wd_cbmem != NULL);
}
ROMSTAGE_CBMEM_INIT_HOOK(vb2_setup_cbmem)
#endif
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