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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 "dcrypto/dcrypto.h"
#include "extension.h"
#include "flash.h"
#include "hooks.h"
#include "include/compile_time_macros.h"
#include "memory.h"
#include "system.h"
#include "registers.h"
#include "uart.h"
#include "upgrade_fw.h"
#include "cryptoc/sha.h"
#define CPRINTF(format, args...) cprintf(CC_EXTENSION, format, ## args)
/*
* This structure defines flash offset ranges of the RO and RW images which
* are not currently active and as such could be overwritten with an update.
*/
struct {
uint32_t ro_base_offset;
uint32_t ro_top_offset;
uint32_t rw_base_offset;
uint32_t rw_top_offset;
} valid_sections;
/* Pick sections where updates can go to based on current code addresses. */
static void set_valid_sections(void)
{
switch (system_get_ro_image_copy()) {
case SYSTEM_IMAGE_RO:
valid_sections.ro_base_offset = CHIP_RO_B_MEM_OFF;
break;
case SYSTEM_IMAGE_RO_B:
valid_sections.ro_base_offset = CONFIG_RO_MEM_OFF;
break;
default:
CPRINTF("Failed to set RO image offsets\n");
return;
}
switch (system_get_image_copy()) {
case SYSTEM_IMAGE_RW:
valid_sections.rw_base_offset = CONFIG_RW_B_MEM_OFF;
break;
case SYSTEM_IMAGE_RW_B:
valid_sections.rw_base_offset = CONFIG_RW_MEM_OFF;
break;
default:
CPRINTF("Failed to set RW image offsets\n");
return;
}
valid_sections.ro_top_offset = valid_sections.ro_base_offset +
CONFIG_RO_SIZE - 0x800; /* 2K for certs! */
valid_sections.rw_top_offset = valid_sections.rw_base_offset +
CONFIG_RW_SIZE;
}
/* Verify that the passed in block fits into the valid area. */
static int valid_upgrade_chunk(uint32_t block_offset, size_t body_size)
{
/* Is this an RW chunk? */
if (valid_sections.rw_top_offset &&
(block_offset >= valid_sections.rw_base_offset) &&
((block_offset + body_size) <= valid_sections.rw_top_offset))
return 1;
/* Is this an RO chunk? */
if (valid_sections.ro_top_offset &&
(block_offset >= valid_sections.ro_base_offset) &&
((block_offset + body_size) <= valid_sections.ro_top_offset))
return 1;
return 0;
}
/* Enable write access to the backup RO section. */
static void open_ro_window(uint32_t offset, size_t size_b)
{
GREG32(GLOBALSEC, FLASH_REGION6_BASE_ADDR) =
offset + CONFIG_PROGRAM_MEMORY_BASE;
GREG32(GLOBALSEC, FLASH_REGION6_SIZE) = size_b - 1;
GWRITE_FIELD(GLOBALSEC, FLASH_REGION6_CTRL, EN, 1);
GWRITE_FIELD(GLOBALSEC, FLASH_REGION6_CTRL, RD_EN, 1);
GWRITE_FIELD(GLOBALSEC, FLASH_REGION6_CTRL, WR_EN, 1);
}
void fw_upgrade_command_handler(void *body,
size_t cmd_size,
size_t *response_size)
{
struct upgrade_command *cmd_body = body;
void *upgrade_data;
uint8_t *error_code = body; /* Cache the address for code clarity. */
uint8_t sha1_digest[SHA_DIGEST_SIZE];
size_t body_size;
uint32_t block_offset;
*response_size = 1; /* One byte response unless this is a start PDU. */
if (cmd_size < sizeof(struct upgrade_command)) {
CPRINTF("%s:%d\n", __func__, __LINE__);
*error_code = UPGRADE_GEN_ERROR;
return;
}
body_size = cmd_size - sizeof(struct upgrade_command);
if (!cmd_body->block_base && !body_size) {
struct first_response_pdu *rpdu = body;
uint32_t base;
uint32_t size;
/*
* This is the connection establishment request, the response
* allows the server to decide what sections of the image to
* send to program into the flash.
*/
/* First, prepare the response structure. */
memset(rpdu, 0, sizeof(*rpdu));
*response_size = sizeof(*rpdu);
rpdu->protocol_version = htobe32(UPGRADE_PROTOCOL_VERSION);
/*
* Determine the valid upgrade sections.
*/
set_valid_sections();
/*
* If there have been any problems when determining the valid
* secitons offsets/sizes - return an error code.
*/
if (!valid_sections.ro_top_offset ||
!valid_sections.rw_top_offset) {
rpdu->return_value = htobe32(UPGRADE_GEN_ERROR);
return;
}
/*
* No problems - let's erase the backup sections and return
* their descriptions to the server.
*/
base = valid_sections.ro_base_offset;
size = valid_sections.ro_top_offset - base;
/* backup RO write access needs to be enabled. */
open_ro_window(base, size);
if (flash_erase(base, size) != EC_SUCCESS) {
CPRINTF("%s:%d erase failure of 0x%x..+0x%x\n",
__func__, __LINE__, base, size);
rpdu->return_value = htobe32(UPGRADE_ERASE_FAILURE);
return;
}
/* Now the RW backup section. */
base = valid_sections.rw_base_offset;
size = valid_sections.rw_top_offset - base;
if (flash_erase(base, size) != EC_SUCCESS) {
CPRINTF("%s:%d erase failure of 0x%x..+0x%x\n",
__func__, __LINE__, base, size);
rpdu->return_value = htobe32(UPGRADE_ERASE_FAILURE);
return;
}
rpdu->vers3.backup_ro_offset =
htobe32(valid_sections.ro_base_offset);
rpdu->vers3.backup_rw_offset =
htobe32(valid_sections.rw_base_offset);
return;
}
/* Check if the block will fit into the valid area. */
block_offset = be32toh(cmd_body->block_base);
if (!valid_upgrade_chunk(block_offset, body_size)) {
*error_code = UPGRADE_BAD_ADDR;
CPRINTF("%s:%d %x, %d base %x top %x\n", __func__, __LINE__,
block_offset, body_size,
valid_sections.rw_base_offset,
valid_sections.rw_top_offset);
return;
}
/* Check if the block was received properly. */
DCRYPTO_SHA1_hash((uint8_t *)&cmd_body->block_base,
body_size + sizeof(cmd_body->block_base),
sha1_digest);
if (memcmp(sha1_digest, &cmd_body->block_digest,
sizeof(cmd_body->block_digest))) {
*error_code = UPGRADE_DATA_ERROR;
CPRINTF("%s:%d sha1 %x not equal received %x at offs. 0x%x\n",
__func__, __LINE__,
*(uint32_t *)sha1_digest, cmd_body->block_digest,
block_offset);
return;
}
CPRINTF("%s: programming at address 0x%x\n", __func__,
block_offset + CONFIG_PROGRAM_MEMORY_BASE);
upgrade_data = cmd_body + 1;
if (flash_physical_write(block_offset, body_size, upgrade_data)
!= EC_SUCCESS) {
*error_code = UPGRADE_WRITE_FAILURE;
CPRINTF("%s:%d upgrade write error\n", __func__, __LINE__);
return;
}
/* Verify that data was written properly. */
if (memcmp(upgrade_data, (void *)
(block_offset + CONFIG_PROGRAM_MEMORY_BASE),
body_size)) {
*error_code = UPGRADE_VERIFY_ERROR;
CPRINTF("%s:%d upgrade verification error\n",
__func__, __LINE__);
return;
}
*error_code = UPGRADE_SUCCESS;
}
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