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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2012 by Amaury Pouly
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "partitions-imx233.h"
#include "string.h"
static bool enable_window = true;
void imx233_partitions_enable_window(bool enable)
{
enable_window = enable;
}
bool imx233_partitions_is_window_enabled(void)
{
return enable_window;
}
#if (IMX233_PARTITIONS & IMX233_CREATIVE)
#define MBLK_MAGIC 0x4d424c4b /* MBLK */
#define MBLK_COUNT 31
/* MBLK is not located in the first sector !
* Creative code uses the hard-coded *absolute* address 0x3ffe00,
* bypassing all partition related information !!
* NOTE: for some reason, the ZEN uses a different value ?! */
#ifdef CREATIVE_ZEN
#define MBLK_ADDR 0x400000
#else
#define MBLK_ADDR 0x3ffe00
#endif
struct mblk_header_t
{
uint32_t magic;
uint32_t block_size;
uint64_t total_size;
} __attribute__((packed));
struct mblk_partition_t
{
uint32_t size;
uint32_t start;
char name[8];
} __attribute__((packed));
static const char *creative_part_name(enum imx233_part_t part)
{
switch(part)
{
case IMX233_PART_CFS: return "cfs";
case IMX233_PART_MINIFS: return "minifs";
default: return "";
}
}
static int compute_window_creative(intptr_t user, part_read_fn_t read_fn,
enum imx233_part_t part, sector_t *start, sector_t *end)
{
uint8_t mblk[512];
int ret = read_fn(user, MBLK_ADDR / 512, 1, mblk);
if(ret < 0)
return ret;
struct mblk_header_t *hdr = (void *)mblk;
if(hdr->magic != MBLK_MAGIC)
return -70; /* bad magic */
struct mblk_partition_t *ent = (void *)(hdr + 1);
const char *name = creative_part_name(part);
for(int i = 0; i < MBLK_COUNT; i++)
{
if(ent[i].name[0] == 0)
continue;
if(strcmp(ent[i].name, name) == 0)
{
*start = ent[i].start * hdr->block_size / 512;
if(part == IMX233_PART_CFS)
{
/* There is a bug in Creative's partitioner which restrict
* computations to 32-bit even though the format itself can
* handle much bigger volumes. We make the assumption
* that the CFS partition always extends up the end of the
* volume. So don't touch *end */
}
else
*end = *start + ent[i].size * hdr->block_size / 512;
return 0;
}
}
return -80; /* not found */
}
#endif /* #(IMX233_PARTITIONS & IMX233_CREATIVE) */
#if (IMX233_PARTITIONS & IMX233_FREESCALE)
static int compute_window_freescale(intptr_t user, part_read_fn_t read_fn,
enum imx233_part_t part, sector_t *start, sector_t *end)
{
uint8_t mbr[512];
int ret = read_fn(user, 0, 1, mbr);
if(ret < 0)
return ret;
/**
* Freescale uses a strange layout: is has a first MBR at sector 0 with four entries:
* 1) Actual user partition
* 2) Sigmatel boot partition
* 3)4) Other (certificate related ?) partitions
* The partition 1) has type 1 but it's actually a type 5 (logical partition) with
* a second partition table with usually one entry which is the FAT32 one.
* The first table uses 512-byte sector size and the second one usually uses
* 2048-byte logical sector size.
*
* WARNING HACK FIXME BUG
* Reverse engineering suggests that OF has a notion of "internal sector size"
* which can either be 512 or 2048 bytes. When applied to the main data drive,
* it internally converts LBA from sectors to "internal sectors". Consequently,
* if the internal sector size is 2048 and the sector size of 512, it will
* drop the lowest 2 bits of the LBA from the partition table. This is the case
* of the ZEN X-Fi3 for example. However, if the internal sector size is 512
* bytes, then there is no such loss. This is the case of the Zen X-Fi Style
* for example.
* The behaviour of the size field is less clear but it seems that it is similarly
* truncated. */
#if defined(CREATIVE_ZENXFISTYLE)
#define DROP_MASK 0
#else
#define DROP_MASK 3
#endif
if(mbr[510] != 0x55 || mbr[511] != 0xAA)
return -101; /* invalid MBR */
if(part == IMX233_PART_DATA)
{
/* sanity check that the first partition is greater than 2Gib */
uint8_t *ent = &mbr[446];
*start = ent[8] | ent[9] << 8 | ent[10] << 16 | ent[11] << 24;
/* ignore two lowest bits(see comment above) */
*start &= ~DROP_MASK;
*end = (ent[12] | ent[13] << 8 | ent[14] << 16 | ent[15] << 24);
*end &= ~DROP_MASK;
/* ignore two lowest bits(order is important, first truncate then add start) */
*end += *start;
if(ent[4] == 0x53)
return -102; /* sigmatel partition */
if((*end - *start) < 1 * 1024 * 1024)
return -103; /* partition too small */
return 0;
}
else if(part == IMX233_PART_BOOT)
{
/* sanity check that the second partition is correct */
uint8_t *ent = &mbr[462];
if(ent[4] != 0x53)
return -104; /* wrong type */
*start = ent[8] | ent[9] << 8 | ent[10] << 16 | ent[11] << 24;
*end = (ent[12] | ent[13] << 8 | ent[14] << 16 | ent[15] << 24);
*end += *start;
return 0;
}
else
return -50;
}
#endif /* (IMX233_PARTITIONS & IMX233_FREESCALE) */
int imx233_partitions_compute_window(intptr_t user, part_read_fn_t read_fn,
enum imx233_part_t part, sector_t *start, sector_t *end)
{
int ret = -1;
#if (IMX233_PARTITIONS & IMX233_CREATIVE)
ret = compute_window_creative(user, read_fn, part, start, end);
if(ret >= 0)
return ret;
#endif
#if (IMX233_PARTITIONS & IMX233_FREESCALE)
ret = compute_window_freescale(user, read_fn, part, start, end);
if(ret >= 0)
return ret;
#endif
return ret;
}
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