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// SPDX-License-Identifier: GPL-2.0+
/*
* Verified Boot for Embedded (VBE) 'simple' method
*
* Copyright 2024 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#define LOG_CATEGORY LOGC_BOOT
#include <dm.h>
#include <memalign.h>
#include <mmc.h>
#include <dm/ofnode.h>
#include "vbe_abrec.h"
int abrec_read_priv(ofnode node, struct abrec_priv *priv)
{
memset(priv, '\0', sizeof(*priv));
if (ofnode_read_u32(node, "area-start", &priv->area_start) ||
ofnode_read_u32(node, "area-size", &priv->area_size) ||
ofnode_read_u32(node, "version-offset", &priv->version_offset) ||
ofnode_read_u32(node, "version-size", &priv->version_size) ||
ofnode_read_u32(node, "state-offset", &priv->state_offset) ||
ofnode_read_u32(node, "state-size", &priv->state_size))
return log_msg_ret("read", -EINVAL);
ofnode_read_u32(node, "skip-offset", &priv->skip_offset);
priv->storage = strdup(ofnode_read_string(node, "storage"));
if (!priv->storage)
return log_msg_ret("str", -EINVAL);
return 0;
}
int abrec_read_nvdata(struct abrec_priv *priv, struct udevice *blk,
struct abrec_state *state)
{
ALLOC_CACHE_ALIGN_BUFFER(u8, buf, MMC_MAX_BLOCK_LEN);
const struct vbe_nvdata *nvd = (struct vbe_nvdata *)buf;
uint flags;
int ret;
ret = vbe_read_nvdata(blk, priv->area_start + priv->state_offset,
priv->state_size, buf);
if (ret == -EPERM) {
memset(buf, '\0', MMC_MAX_BLOCK_LEN);
log_warning("Starting with empty state\n");
} else if (ret) {
return log_msg_ret("nv", ret);
}
state->fw_vernum = nvd->fw_vernum;
flags = nvd->flags;
state->try_count = flags & VBEF_TRY_COUNT_MASK;
state->try_b = flags & VBEF_TRY_B;
state->recovery = flags & VBEF_RECOVERY;
state->pick = (flags & VBEF_PICK_MASK) >> VBEF_PICK_SHIFT;
return 0;
}
int abrec_read_state(struct udevice *dev, struct abrec_state *state)
{
struct abrec_priv *priv = dev_get_priv(dev);
struct udevice *blk;
int ret;
ret = vbe_get_blk(priv->storage, &blk);
if (ret)
return log_msg_ret("blk", ret);
ret = vbe_read_version(blk, priv->area_start + priv->version_offset,
state->fw_version, MAX_VERSION_LEN);
if (ret)
return log_msg_ret("ver", ret);
log_debug("version=%s\n", state->fw_version);
ret = abrec_read_nvdata(priv, blk, state);
if (ret)
return log_msg_ret("nvd", ret);
return 0;
}
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