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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 <reset.h>
#include <string.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;
};
static const size_t vb_work_buf_size = 16 * KiB;
static struct vb2_working_data * const vboot_get_working_data(void)
{
if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE))
/* cbmem_add() does a cbmem_find() first. */
return cbmem_add(CBMEM_ID_VBOOT_WORKBUF, vb_work_buf_size);
else
return (struct vb2_working_data *)_vboot2_work;
}
static size_t vb2_working_data_size(void)
{
if (CONFIG(VBOOT_STARTS_IN_ROMSTAGE))
return vb_work_buf_size;
else
return REGION_SIZE(vboot2_work);
}
static struct selected_region *vb2_selected_region(void)
{
struct selected_region *sel_reg = NULL;
/* Ramstage and postcar always uses cbmem as a source of truth. */
if (ENV_RAMSTAGE || ENV_POSTCAR)
sel_reg = cbmem_find(CBMEM_ID_VBOOT_SEL_REG);
else if (ENV_ROMSTAGE) {
/* Try cbmem first. Fall back on working data if not found. */
sel_reg = cbmem_find(CBMEM_ID_VBOOT_SEL_REG);
if (sel_reg == NULL) {
struct vb2_working_data *wd = vboot_get_working_data();
sel_reg = &wd->selected_region;
}
} else {
/* Stages such as bootblock and verstage use working data. */
struct vb2_working_data *wd = vboot_get_working_data();
sel_reg = &wd->selected_region;
}
return sel_reg;
}
void vb2_init_work_context(struct vb2_context *ctx)
{
struct vb2_working_data *wd;
size_t work_size;
/* First initialize the working data region. */
work_size = vb2_working_data_size();
wd = vboot_get_working_data();
memset(wd, 0, work_size);
/*
* 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 = work_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;
}
struct vb2_shared_data *vb2_get_shared_data(void)
{
struct vb2_working_data *wd = vboot_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_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_selected_region();
assert(reg != NULL);
reg->offset = region_offset(region);
reg->size = region_sz(region);
}
int vb2_is_slot_selected(void)
{
const struct selected_region *reg = vb2_selected_region();
assert(reg != NULL);
return reg->size > 0;
}
void vb2_store_selected_region(void)
{
const struct vb2_working_data *wd;
struct selected_region *sel_reg;
/* Always use the working data in this path since it's the object
* which has the result.. */
wd = vboot_get_working_data();
sel_reg = cbmem_add(CBMEM_ID_VBOOT_SEL_REG, sizeof(*sel_reg));
assert(sel_reg != NULL);
sel_reg->offset = wd->selected_region.offset;
sel_reg->size = wd->selected_region.size;
}
/*
* For platforms that employ VBOOT_STARTS_IN_ROMSTAGE, the vboot
* verification doesn't happen until after cbmem is brought online.
* Therefore, the selected region contents would not be initialized
* so don't automatically add results when cbmem comes online.
*/
#if !CONFIG(VBOOT_STARTS_IN_ROMSTAGE)
static void vb2_store_selected_region_cbmem(int unused)
{
vb2_store_selected_region();
}
ROMSTAGE_CBMEM_INIT_HOOK(vb2_store_selected_region_cbmem)
#endif
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