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/* Copyright 2016 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "byteorder.h"
#include "console.h"
#include "extension.h"
#include "flash.h"
#include "hooks.h"
#include "include/compile_time_macros.h"
#include "uart.h"
#include "update_fw.h"
#include "util.h"
#define CPRINTF(format, args...) cprintf(CC_USB, format, ## args)
/* Various update extension command return values. */
enum return_value {
UPDATE_SUCCESS = 0,
UPDATE_BAD_ADDR = 1,
UPDATE_ERASE_FAILURE = 2,
UPDATE_DATA_ERROR = 3,
UPDATE_WRITE_FAILURE = 4,
UPDATE_VERIFY_ERROR = 5,
UPDATE_GEN_ERROR = 6,
};
/*
* The payload of the update command. (Integer values in network byte order).
*
* block digest: the first four bytes of the sha1 digest of the rest of the
* structure.
* block_base: address where this block needs to be written to.
* block_body: variable size data to written at address 'block_base'.
*/
struct update_command {
uint32_t block_digest;
uint32_t block_base;
uint8_t block_body[0];
} __packed;
const struct section_descriptor *valid_section;
/* Pick the section where updates can go to based on current code address. */
static int set_valid_section(void)
{
int i;
uint32_t run_time_offs = (uint32_t) set_valid_section -
CONFIG_PROGRAM_MEMORY_BASE;
valid_section = rw_sections;
for (i = 0; i < num_rw_sections; i++) {
if ((run_time_offs > rw_sections[i].sect_base_offset) &&
(run_time_offs < rw_sections[i].sect_top_offset))
continue;
valid_section = rw_sections + i;
break;
}
if (i == num_rw_sections) {
CPRINTF("%s:%d No valid section found!\n", __func__, __LINE__);
return EC_ERROR_INVAL;
}
return EC_SUCCESS;
}
/* Verify that the passed in block fits into the valid area. */
static int valid_update_chunk(uint32_t block_offset, size_t body_size)
{
if (valid_section &&
(block_offset >= valid_section->sect_base_offset) &&
((block_offset + body_size) <= valid_section->sect_top_offset))
return 1;
return 0;
}
void fw_update_command_handler(void *body,
size_t cmd_size,
size_t *response_size)
{
struct update_command *cmd_body = body;
uint8_t *rv = body;
size_t body_size;
uint32_t block_offset;
/*
* A single byte response, unless this is the first message in the
* programming sequence.
*/
*response_size = sizeof(*rv);
body_size = cmd_size - offsetof(struct update_command, block_body);
if (body_size < 0) {
CPRINTF("%s:%d\n", __func__, __LINE__);
*rv = UPDATE_GEN_ERROR;
return;
}
if (!cmd_body->block_base && !body_size) {
int ret;
/*
* This is the first message of the update process, let's
* determine the valid update section and erase its contents.
*/
ret = set_valid_section();
if (ret) {
CPRINTF("%s:%d no valid section\n", __func__, __LINE__);
return;
}
if (flash_physical_erase(valid_section->sect_base_offset,
valid_section->sect_top_offset -
valid_section->sect_base_offset)) {
CPRINTF("%s:%d erase failure of 0x%x..+0x%x\n",
__func__, __LINE__,
valid_section->sect_base_offset,
valid_section->sect_top_offset -
valid_section->sect_base_offset);
*rv = UPDATE_ERASE_FAILURE;
return;
}
/*
* Successful erase means that we need to return the base
* address of the section to be programmed with the update.
*/
*(uint32_t *)body = htobe32(valid_section->sect_base_offset +
CONFIG_PROGRAM_MEMORY_BASE);
*response_size = sizeof(uint32_t);
return;
}
/* Check if the block will fit into the valid area. */
block_offset = be32toh(cmd_body->block_base) -
CONFIG_PROGRAM_MEMORY_BASE;
if (!valid_update_chunk(block_offset, body_size)) {
*rv = UPDATE_BAD_ADDR;
CPRINTF("%s:%d Write out of range %x ..+%d (Window %x - %x)\n",
__func__, __LINE__,
block_offset, body_size,
valid_section->sect_base_offset,
valid_section->sect_top_offset);
return;
}
if (flash_physical_write(block_offset, body_size,
cmd_body->block_body) != EC_SUCCESS) {
*rv = UPDATE_WRITE_FAILURE;
CPRINTF("%s:%d update write error @0x%x:%x\n",
__func__, __LINE__, block_offset, body_size);
return;
}
/* Werify that data was written properly. */
if (memcmp(cmd_body->block_body, (void *)
(block_offset + CONFIG_PROGRAM_MEMORY_BASE),
body_size)) {
*rv = UPDATE_VERIFY_ERROR;
CPRINTF("%s:%d update verification error\n",
__func__, __LINE__);
return;
}
*rv = UPDATE_SUCCESS;
}
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