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![dimok321](/assets/img/avatar_default.png)
*updated libntfs (write fix) *updated libfat *lots of changes in the startup code, removed almost everything. This might cause problems for some drives at loading the gamelist and needs to be adjusted later but better this time. more cleanup is needed in main.cpp and will come. *using libogc sd/usb for config loading and reload to cIOS afterwards *added missing boothomebrew stuff pune forgot NOTE: From now on we will be doing a lot of revs which we won't be compiling and releasing. This revs are officially not available for public so don't making issues regarding those revs. Those will be closed right away. We need first to cleanup a lot of crap and update loader to new standards before releasing stuff again.
319 lines
10 KiB
C
319 lines
10 KiB
C
/*
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partition.c
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Functions for mounting and dismounting partitions
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on various block devices.
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "partition.h"
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#include "bit_ops.h"
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#include "file_allocation_table.h"
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#include "directory.h"
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#include "mem_allocate.h"
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#include "fatfile.h"
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#include <string.h>
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#include <ctype.h>
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#include <sys/iosupport.h>
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sec_t _FAT_startSector;
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/*
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This device name, as known by devkitPro toolchains
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*/
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const char* DEVICE_NAME = "fat";
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/*
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Data offsets
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*/
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// BIOS Parameter Block offsets
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enum BPB {
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BPB_jmpBoot = 0x00,
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BPB_OEMName = 0x03,
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// BIOS Parameter Block
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BPB_bytesPerSector = 0x0B,
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BPB_sectorsPerCluster = 0x0D,
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BPB_reservedSectors = 0x0E,
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BPB_numFATs = 0x10,
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BPB_rootEntries = 0x11,
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BPB_numSectorsSmall = 0x13,
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BPB_mediaDesc = 0x15,
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BPB_sectorsPerFAT = 0x16,
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BPB_sectorsPerTrk = 0x18,
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BPB_numHeads = 0x1A,
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BPB_numHiddenSectors = 0x1C,
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BPB_numSectors = 0x20,
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// Ext BIOS Parameter Block for FAT16
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BPB_FAT16_driveNumber = 0x24,
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BPB_FAT16_reserved1 = 0x25,
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BPB_FAT16_extBootSig = 0x26,
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BPB_FAT16_volumeID = 0x27,
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BPB_FAT16_volumeLabel = 0x2B,
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BPB_FAT16_fileSysType = 0x36,
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// Bootcode
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BPB_FAT16_bootCode = 0x3E,
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// FAT32 extended block
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BPB_FAT32_sectorsPerFAT32 = 0x24,
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BPB_FAT32_extFlags = 0x28,
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BPB_FAT32_fsVer = 0x2A,
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BPB_FAT32_rootClus = 0x2C,
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BPB_FAT32_fsInfo = 0x30,
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BPB_FAT32_bkBootSec = 0x32,
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// Ext BIOS Parameter Block for FAT32
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BPB_FAT32_driveNumber = 0x40,
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BPB_FAT32_reserved1 = 0x41,
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BPB_FAT32_extBootSig = 0x42,
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BPB_FAT32_volumeID = 0x43,
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BPB_FAT32_volumeLabel = 0x47,
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BPB_FAT32_fileSysType = 0x52,
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// Bootcode
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BPB_FAT32_bootCode = 0x5A,
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BPB_bootSig_55 = 0x1FE,
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BPB_bootSig_AA = 0x1FF
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};
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static const char FAT_SIG[3] = {'F', 'A', 'T'};
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sec_t FindFirstValidPartition(const DISC_INTERFACE* disc)
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{
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uint8_t part_table[16*4];
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uint8_t *ptr;
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int i;
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uint8_t sectorBuffer[BYTES_PER_READ] = {0};
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// Read first sector of disc
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if (!_FAT_disc_readSectors (disc, 0, 1, sectorBuffer)) {
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return 0;
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}
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memcpy(part_table,sectorBuffer+0x1BE,16*4);
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ptr = part_table;
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for(i=0;i<4;i++,ptr+=16) {
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sec_t part_lba = u8array_to_u32(ptr, 0x8);
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if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) ||
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!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) {
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return part_lba;
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}
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if(ptr[4]==0) continue;
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if(ptr[4]==0x0F) {
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sec_t part_lba2=part_lba;
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sec_t next_lba2=0;
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int n;
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for(n=0;n<8;n++) // max 8 logic partitions
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{
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if(!_FAT_disc_readSectors (disc, part_lba+next_lba2, 1, sectorBuffer)) return 0;
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part_lba2 = part_lba + next_lba2 + u8array_to_u32(sectorBuffer, 0x1C6) ;
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next_lba2 = u8array_to_u32(sectorBuffer, 0x1D6);
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if(!_FAT_disc_readSectors (disc, part_lba2, 1, sectorBuffer)) return 0;
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if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) ||
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!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
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{
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return part_lba2;
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}
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if(next_lba2==0) break;
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}
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} else {
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if(!_FAT_disc_readSectors (disc, part_lba, 1, sectorBuffer)) return 0;
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if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) ||
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!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) {
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return part_lba;
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}
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}
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}
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return 0;
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}
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PARTITION* _FAT_partition_constructor (const DISC_INTERFACE* disc, uint32_t cacheSize, uint32_t sectorsPerPage, sec_t startSector) {
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PARTITION* partition;
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uint8_t sectorBuffer[BYTES_PER_READ] = {0};
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// Read first sector of disc
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if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) {
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return NULL;
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}
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// Make sure it is a valid MBR or boot sector
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if ( (sectorBuffer[BPB_bootSig_55] != 0x55) || (sectorBuffer[BPB_bootSig_AA] != 0xAA)) {
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return NULL;
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}
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if (startSector != 0) {
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// We're told where to start the partition, so just accept it
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} else if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG))) {
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// Check if there is a FAT string, which indicates this is a boot sector
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startSector = 0;
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} else if (!memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG))) {
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// Check for FAT32
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startSector = 0;
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} else {
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startSector = FindFirstValidPartition(disc);
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if (!_FAT_disc_readSectors (disc, startSector, 1, sectorBuffer)) {
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return NULL;
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}
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}
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// Now verify that this is indeed a FAT partition
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if (memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)) &&
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memcmp(sectorBuffer + BPB_FAT32_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
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{
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return NULL;
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}
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// check again for the last two cases to make sure that we really have a FAT filesystem here
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// and won't corrupt any data
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if(memcmp(sectorBuffer + BPB_FAT16_fileSysType, "FAT", 3) != 0 && memcmp(sectorBuffer + BPB_FAT32_fileSysType, "FAT32", 5) != 0)
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{
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return NULL;
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}
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partition = (PARTITION*) _FAT_mem_allocate (sizeof(PARTITION));
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if (partition == NULL) {
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return NULL;
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}
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// Init the partition lock
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_FAT_lock_init(&partition->lock);
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_FAT_startSector = startSector;
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if (!memcmp(sectorBuffer + BPB_FAT16_fileSysType, FAT_SIG, sizeof(FAT_SIG)))
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strncpy(partition->label, (char*)(sectorBuffer + BPB_FAT16_volumeLabel), 11);
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else
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strncpy(partition->label, (char*)(sectorBuffer + BPB_FAT32_volumeLabel), 11);
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partition->label[11] = '\0';
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// Set partition's disc interface
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partition->disc = disc;
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// Store required information about the file system
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partition->fat.sectorsPerFat = u8array_to_u16(sectorBuffer, BPB_sectorsPerFAT);
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if (partition->fat.sectorsPerFat == 0) {
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partition->fat.sectorsPerFat = u8array_to_u32( sectorBuffer, BPB_FAT32_sectorsPerFAT32);
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}
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partition->numberOfSectors = u8array_to_u16( sectorBuffer, BPB_numSectorsSmall);
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if (partition->numberOfSectors == 0) {
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partition->numberOfSectors = u8array_to_u32( sectorBuffer, BPB_numSectors);
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}
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partition->bytesPerSector = BYTES_PER_READ; // Sector size is redefined to be 512 bytes
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partition->sectorsPerCluster = sectorBuffer[BPB_sectorsPerCluster] * u8array_to_u16(sectorBuffer, BPB_bytesPerSector) / BYTES_PER_READ;
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partition->bytesPerCluster = partition->bytesPerSector * partition->sectorsPerCluster;
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partition->fat.fatStart = startSector + u8array_to_u16(sectorBuffer, BPB_reservedSectors);
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partition->rootDirStart = partition->fat.fatStart + (sectorBuffer[BPB_numFATs] * partition->fat.sectorsPerFat);
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partition->dataStart = partition->rootDirStart +
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(( u8array_to_u16(sectorBuffer, BPB_rootEntries) * DIR_ENTRY_DATA_SIZE) / partition->bytesPerSector);
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partition->totalSize = ((uint64_t)partition->numberOfSectors - (partition->dataStart - startSector)) * (uint64_t)partition->bytesPerSector;
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// Store info about FAT
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uint32_t clusterCount = (partition->numberOfSectors - (uint32_t)(partition->dataStart - startSector)) / partition->sectorsPerCluster;
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partition->fat.lastCluster = clusterCount + CLUSTER_FIRST - 1;
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partition->fat.firstFree = CLUSTER_FIRST;
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if (clusterCount < CLUSTERS_PER_FAT12) {
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partition->filesysType = FS_FAT12; // FAT12 volume
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} else if (clusterCount < CLUSTERS_PER_FAT16) {
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partition->filesysType = FS_FAT16; // FAT16 volume
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} else {
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partition->filesysType = FS_FAT32; // FAT32 volume
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}
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if (partition->filesysType != FS_FAT32) {
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partition->rootDirCluster = FAT16_ROOT_DIR_CLUSTER;
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} else {
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// Set up for the FAT32 way
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partition->rootDirCluster = u8array_to_u32(sectorBuffer, BPB_FAT32_rootClus);
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// Check if FAT mirroring is enabled
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if (!(sectorBuffer[BPB_FAT32_extFlags] & 0x80)) {
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// Use the active FAT
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partition->fat.fatStart = partition->fat.fatStart + ( partition->fat.sectorsPerFat * (sectorBuffer[BPB_FAT32_extFlags] & 0x0F));
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}
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}
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// Create a cache to use
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partition->cache = _FAT_cache_constructor (cacheSize, sectorsPerPage, partition->disc, startSector+partition->numberOfSectors);
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// Set current directory to the root
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partition->cwdCluster = partition->rootDirCluster;
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// Check if this disc is writable, and set the readOnly property appropriately
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partition->readOnly = !(_FAT_disc_features(disc) & FEATURE_MEDIUM_CANWRITE);
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// There are currently no open files on this partition
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partition->openFileCount = 0;
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partition->firstOpenFile = NULL;
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return partition;
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}
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void _FAT_partition_destructor (PARTITION* partition) {
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FILE_STRUCT* nextFile;
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_FAT_lock(&partition->lock);
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// Synchronize open files
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nextFile = partition->firstOpenFile;
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while (nextFile) {
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_FAT_syncToDisc (nextFile);
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nextFile = nextFile->nextOpenFile;
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}
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// Free memory used by the cache, writing it to disc at the same time
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_FAT_cache_destructor (partition->cache);
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// Unlock the partition and destroy the lock
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_FAT_unlock(&partition->lock);
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_FAT_lock_deinit(&partition->lock);
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// Free memory used by the partition
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_FAT_mem_free (partition);
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}
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PARTITION* _FAT_partition_getPartitionFromPath (const char* path) {
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const devoptab_t *devops;
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devops = GetDeviceOpTab (path);
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if (!devops) {
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return NULL;
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}
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return (PARTITION*)devops->deviceData;
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}
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