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/*
* Copyright (C) 2015 IBM Corporation
*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <asm/byteorder.h>
#include <log/log.h>
#include <talloc/talloc.h>
#include <flash/flash.h>
#include <ccan/endian/endian.h>
#include <libflash/arch_flash.h>
#include <libflash/blocklevel.h>
#include <libflash/libflash.h>
#include <libflash/libffs.h>
#include <libflash/file.h>
#include <libflash/ecc.h>
#define SECURE_BOOT_HEADERS_SIZE 4096
#define ROM_MAGIC_NUMBER 0x17082011
struct flash_info {
/* Device information */
struct blocklevel_device *bl;
struct ffs_handle *ffs;
uint64_t size; /* raw size of partition */
const char *path;
bool ecc;
uint32_t erase_granule;
/* Partition information */
uint32_t attr_part_idx;
uint32_t attr_data_pos;
uint32_t attr_data_len; /* Includes ECC bytes */
/* 'Other Side' info if present */
struct flash_info *other_side;
};
static int partition_info(struct flash_info *info, const char *partition)
{
int rc;
rc = ffs_lookup_part(info->ffs, partition, &info->attr_part_idx);
if (rc) {
pb_log("Failed to find %s partition\n", partition);
return rc;
}
return ffs_part_info(info->ffs, info->attr_part_idx, NULL,
&info->attr_data_pos, &info->attr_data_len,
NULL, &info->ecc);
}
static struct flash_info *flash_setup_buffer(void *ctx, const char *partition)
{
struct flash_info *info;
struct ffs_handle *tmp = NULL;
int rc = 0;
if (!partition)
return NULL;
info = talloc_zero(ctx, struct flash_info);
if (!info)
return NULL;
rc = arch_flash_init(&info->bl, NULL, true);
if (rc) {
pb_log("Failed to init mtd device\n");
goto out;
}
rc = blocklevel_get_info(info->bl, &info->path, &info->size,
&info->erase_granule);
if (rc) {
pb_log("Failed to retrieve blocklevel info\n");
goto out_flash;
}
rc = ffs_init(0, info->size, info->bl, &info->ffs, 1);
if (rc) {
pb_log_fn("Failed to init ffs\n");
goto out_flash;
}
rc = partition_info(info, partition);
if (rc) {
pb_log("Failed to retrieve partition info\n");
goto out_ffs;
}
/* Check if there is a second flash side. If there is not, or
* we fail to recognise it, ignore it and continue */
ffs_next_side(info->ffs, &tmp, info->ecc);
if (tmp && ffs_equal(info->ffs, tmp) == false) {
pb_debug("Other side present on MTD device\n");
info->other_side = talloc_zero(info, struct flash_info);
info->other_side->ffs = tmp;
info->other_side->bl = info->bl;
info->other_side->size = info->size;
info->other_side->path = info->path;
info->other_side->ecc = info->ecc;
info->other_side->erase_granule = info->erase_granule;
rc = partition_info(info->other_side, partition);
if (rc)
pb_log("Failed to retrieve partition info "
"for other side - ignoring\n");
}
pb_debug("%s Details\n", partition);
pb_debug("\tName\t\t%s\n", info->path);
pb_debug("\tFlash Size\t%lu\n", info->size);
pb_debug("\tGranule\t\t%u\n", info->erase_granule);
pb_debug("\tECC\t\t%s\n", info->ecc ? "Protected" : "Unprotected");
pb_debug("\tCurrent Side info:\n");
pb_debug("\tIndex\t\t%u\n", info->attr_part_idx);
pb_debug("\tOffset\t\t%u\n", info->attr_data_pos);
pb_debug("\tPart. Size\t%u\n", info->attr_data_len);
if (info->other_side) {
pb_debug("\tOther Side info:\n");
pb_debug("\tIndex\t\t%u\n", info->other_side->attr_part_idx);
pb_debug("\tOffset\t\t%u\n", info->other_side->attr_data_pos);
pb_debug("\tPart. Size\t%u\n", info->other_side->attr_data_len);
}
return info;
out_ffs:
ffs_close(info->ffs);
out_flash:
arch_flash_close(info->bl, NULL);
out:
talloc_free(info);
return NULL;
}
/* See stb_is_container() in Skiboot */
static bool is_signed(char *buffer, uint32_t len)
{
if (!buffer || len <= SECURE_BOOT_HEADERS_SIZE)
return false;
if (be32_to_cpu(*(uint32_t *)buffer) != ROM_MAGIC_NUMBER)
return false;
return true;
}
int flash_parse_version(void *ctx, char ***versions, bool current)
{
char *saveptr, *tok, **tmp, *buffer;
const char *delim = "\n";
struct flash_info *info, *cur_info;
uint32_t len;
int rc, n = 0;
saveptr = tok = NULL;
tmp = NULL;
info = flash_setup_buffer(ctx, "VERSION");
if (!info)
return 0;
if (!current && !info->other_side)
return 0;
cur_info = !current ? info->other_side : info;
len = cur_info->attr_data_len - ecc_size(cur_info->attr_data_len);
buffer = talloc_array(cur_info, char, len);
if (!buffer) {
pb_log_fn("Failed to init buffer!\n");
goto out;
}
rc = blocklevel_read(cur_info->bl, cur_info->attr_data_pos,
buffer, len);
if (rc) {
pb_log("Failed to read VERSION partition\n");
goto out;
}
/* Check if this partition is signed */
if (is_signed(buffer, len))
buffer += SECURE_BOOT_HEADERS_SIZE;
/* open-power-platform */
tok = strtok_r(buffer, delim, &saveptr);
if (tok) {
tmp = talloc_realloc(ctx, tmp, char *, n + 1);
if (!tmp) {
pb_log_fn("Failed to allocate memory\n");
goto out;
}
tmp[n++] = talloc_strdup(ctx, tok);
}
tok = strtok_r(NULL, delim, &saveptr);
while (tok) {
/* Ignore leading tab from subsequent lines */
tmp = talloc_realloc(ctx, tmp, char *, n + 1);
if (!tmp) {
pb_log_fn("Failed to reallocate memory\n");
n = 0;
goto out;
}
tmp[n++] = talloc_strdup(ctx, tok + 1);
tok = strtok_r(NULL, delim, &saveptr);
}
out:
pb_debug("%d version strings read from %s side\n",
n, current ? "current" : "other");
arch_flash_close(info->bl, NULL);
talloc_free(info);
*versions = tmp;
return n;
}
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