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/*
* Copyright (c) 2012 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 <stddef.h>
#include "common.h"
#include "version.h"
/* FMAP structs. See http://code.google.com/p/flashmap/wiki/FmapSpec */
#define FMAP_NAMELEN 32
#define FMAP_SIGNATURE "__FMAP__"
#define FMAP_SIGNATURE_SIZE 8
#define FMAP_VER_MAJOR 1
#define FMAP_VER_MINOR 0
/*
* For address containing CONFIG_FLASH_BASE (symbols in *.RO.lds.S and
* variable), this computes the offset to the start of the image on flash.
*/
#define RELATIVE_RO(addr) ((addr) - CONFIG_FLASH_BASE - CONFIG_RO_MEM_OFF)
struct fmap_header {
char fmap_signature[FMAP_SIGNATURE_SIZE];
uint8_t fmap_ver_major;
uint8_t fmap_ver_minor;
uint64_t fmap_base;
uint32_t fmap_size;
char fmap_name[FMAP_NAMELEN];
uint16_t fmap_nareas;
} __packed;
#define FMAP_AREA_STATIC (1 << 0) /* can be checksummed */
#define FMAP_AREA_COMPRESSED (1 << 1) /* may be compressed */
#define FMAP_AREA_RO (1 << 2) /* writes may fail */
struct fmap_area_header {
uint32_t area_offset;
uint32_t area_size;
char area_name[FMAP_NAMELEN];
uint16_t area_flags;
} __packed;
#define NUM_EC_FMAP_AREAS 7
const struct _ec_fmap {
struct fmap_header header;
struct fmap_area_header area[NUM_EC_FMAP_AREAS];
} ec_fmap __attribute__((section(".google"))) = {
/* Header */
{
.fmap_signature = {'_', '_', 'F', 'M', 'A', 'P', '_', '_'},
.fmap_ver_major = FMAP_VER_MAJOR,
.fmap_ver_minor = FMAP_VER_MINOR,
.fmap_base = CONFIG_FLASH_BASE,
.fmap_size = CONFIG_FLASH_SIZE,
.fmap_name = "EC_FMAP",
.fmap_nareas = NUM_EC_FMAP_AREAS,
},
{
/* RO Firmware */
{
/*
* Range of RO firmware to be updated. Verified in
* factory finalization by hash. Should not have
* volatile data (ex, calibration results).
*/
.area_name = "EC_RO",
.area_offset = CONFIG_RO_STORAGE_OFF,
.area_size = CONFIG_RO_SIZE,
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
{
/* (Optional) RO firmware code. */
.area_name = "FR_MAIN",
.area_offset = CONFIG_RO_STORAGE_OFF,
.area_size = CONFIG_RO_SIZE,
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
{
/*
* RO firmware version ID. Must be NULL terminated
* ASCII, and padded with \0.
*/
.area_name = "RO_FRID",
.area_offset = CONFIG_RO_STORAGE_OFF +
RELATIVE_RO((uint32_t)__version_struct_offset) +
offsetof(struct version_struct, version),
.area_size = sizeof(version_data.version),
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
/* Other RO stuff: FMAP, WP, KEYS, etc. */
{
.area_name = "FMAP",
.area_offset = CONFIG_RO_STORAGE_OFF +
RELATIVE_RO((uint32_t)&ec_fmap),
.area_size = sizeof(ec_fmap),
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
{
/*
* The range for write protection, for factory
* finalization. Should include (may be identical to)
* EC_RO and aligned to hardware specification.
*/
.area_name = "WP_RO",
.area_offset = CONFIG_WP_OFF,
.area_size = CONFIG_WP_SIZE,
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
/* RW Firmware */
{
/* The range of RW firmware to be auto-updated. */
.area_name = "EC_RW",
.area_offset = CONFIG_RW_STORAGE_OFF,
.area_size = CONFIG_RW_SIZE,
.area_flags = FMAP_AREA_STATIC | FMAP_AREA_RO,
},
{
/*
* RW firmware version ID. Must be NULL terminated
* ASCII, and padded with \0.
* TODO: Get the relative offset of
* __version_struct_offset within our RW image to
* accomodate image asymmetry.
*/
.area_name = "RW_FWID",
.area_offset = CONFIG_RW_STORAGE_OFF +
RELATIVE_RO((uint32_t)__version_struct_offset) +
offsetof(struct version_struct, version),
.area_size = sizeof(version_data.version),
.area_flags = FMAP_AREA_STATIC,
},
}
};
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