310 lines
8.4 KiB
C
310 lines
8.4 KiB
C
#include <libultraship/libultra.h>
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#include "global.h"
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s32 __osPfsInodeCacheChannel = -1;
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u8 __osPfsInodeCacheBank = 250;
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u16 __osSumcalc(u8* ptr, s32 length) {
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s32 i;
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u32 sum = 0;
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u8* temp = ptr;
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for (i = 0; i < length; i++) {
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sum += *temp++;
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}
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return sum & 0xFFFF;
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}
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s32 __osIdCheckSum(u16* ptr, u16* checkSum, u16* idSum) {
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u16 data = 0;
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u32 i;
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*checkSum = *idSum = 0;
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for (i = 0; i < ((sizeof(__OSPackId) - sizeof(uintptr_t)) / sizeof(u8)); i += 2) {
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data = *((u16*)((uintptr_t)ptr + i));
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*checkSum += data;
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*idSum += ~data;
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}
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return 0;
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}
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s32 __osRepairPackId(OSPfs* pfs, __OSPackId* badid, __OSPackId* newid) {
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s32 ret = 0;
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u8 temp[BLOCKSIZE];
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u8 comp[BLOCKSIZE];
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u8 mask = 0;
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s32 i, j = 0;
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u16 index[4];
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newid->repaired = 0xFFFFFFFF;
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newid->random = osGetCount();
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newid->serialMid = badid->serialMid;
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newid->serialLow = badid->serialLow;
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if ((pfs->activebank != 0) && ((ret = __osPfsSelectBank(pfs, 0)) != 0)) {
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return ret;
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}
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do {
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if ((ret = __osPfsSelectBank(pfs, j)) != 0) {
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return ret;
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, 0, temp)) != 0) {
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return ret;
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}
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temp[0] = j | 0x80;
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for (i = 1; i < BLOCKSIZE; i++) {
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temp[i] = ~temp[i];
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}
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if ((ret = __osContRamWrite(pfs->queue, pfs->channel, 0, temp, 0)) != 0) {
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return ret;
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, 0, comp)) != 0) {
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return (ret);
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}
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for (i = 0; i < BLOCKSIZE; i++) {
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if (comp[i] != temp[i]) {
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break;
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}
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}
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if (i != BLOCKSIZE) {
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break;
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}
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if (j > 0) {
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if ((ret = __osPfsSelectBank(pfs, 0)) != 0) {
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return ret;
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, 0, temp)) != 0) {
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return ret;
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}
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if (temp[0] != 0x80) {
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break;
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}
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}
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j++;
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} while (j < PFS_MAX_BANKS);
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if ((pfs->activebank != 0) && (ret = __osPfsSelectBank(pfs, 0)) != 0) {
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return ret;
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}
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mask = (j > 0) ? 1 : 0;
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newid->deviceid = (badid->deviceid & 0xFFFE) | mask;
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newid->banks = j;
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newid->version = badid->version;
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__osIdCheckSum((u16*)newid, &newid->checksum, &newid->invertedChecksum);
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index[0] = PFS_ID_0AREA;
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index[1] = PFS_ID_1AREA;
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index[2] = PFS_ID_2AREA;
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index[3] = PFS_ID_3AREA;
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for (i = 0; i < 4; i++) {
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if ((ret = __osContRamWrite(pfs->queue, pfs->channel, index[i], (u8*)newid, PFS_FORCE)) != 0) {
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return ret;
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}
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, PFS_ID_0AREA, temp)) != 0) {
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return ret;
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}
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for (i = 0; i < BLOCKSIZE; i++) {
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if (temp[i] != *(u8*)((s32)newid + i)) {
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return PFS_ERR_DEVICE;
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}
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}
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return 0;
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}
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s32 __osCheckPackId(OSPfs* pfs, __OSPackId* check) {
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u16 index[4];
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s32 ret = 0;
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u16 sum;
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u16 idSum;
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s32 i;
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s32 j;
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if ((pfs->activebank != 0) && (ret = __osPfsSelectBank(pfs, 0)) != 0) {
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return ret;
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}
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index[0] = PFS_ID_0AREA;
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index[1] = PFS_ID_1AREA;
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index[2] = PFS_ID_2AREA;
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index[3] = PFS_ID_3AREA;
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for (i = 1; i < 4; i++) {
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, index[i], (u8*)check)) != 0) {
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return ret;
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}
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__osIdCheckSum((u16*)check, &sum, &idSum);
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if ((check->checksum == sum) && (check->invertedChecksum == idSum)) {
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break;
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}
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}
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if (i == 4) {
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return PFS_ERR_ID_FATAL;
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}
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for (j = 0; j < 4; j++) {
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if (j != i) {
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if ((ret = __osContRamWrite(pfs->queue, pfs->channel, index[j], (u8*)check, PFS_FORCE)) != 0) {
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return ret;
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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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s32 __osGetId(OSPfs* pfs) {
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u16 sum;
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u16 isum;
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u8 temp[BLOCKSIZE];
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__OSPackId* id;
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__OSPackId newid;
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s32 ret;
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if (pfs->activebank != 0) {
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if ((ret = __osPfsSelectBank(pfs, 0)) != 0) {
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return ret;
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}
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, PFS_ID_0AREA, temp)) != 0) {
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return ret;
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}
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__osIdCheckSum((u16*)temp, &sum, &isum);
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id = (__OSPackId*)temp;
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if ((id->checksum != sum) || (id->invertedChecksum != isum)) {
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if ((ret = __osCheckPackId(pfs, id)) == PFS_ERR_ID_FATAL) {
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ret = __osRepairPackId(pfs, id, &newid);
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if (ret) {
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return ret;
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}
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id = &newid;
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} else if (ret != 0) {
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return ret;
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}
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}
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if ((id->deviceid & 0x01) == 0) {
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ret = __osRepairPackId(pfs, id, &newid);
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if (ret) {
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return ret;
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}
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id = &newid;
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if ((id->deviceid & 0x01) == 0) {
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return PFS_ERR_DEVICE;
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}
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}
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bcopy(id, pfs->id, BLOCKSIZE);
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pfs->version = id->version;
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pfs->banks = id->banks;
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pfs->inodeStartPage = 1 + DEF_DIR_PAGES + (2 * pfs->banks);
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pfs->dir_size = DEF_DIR_PAGES * PFS_ONE_PAGE;
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pfs->inode_table = 1 * PFS_ONE_PAGE;
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pfs->minode_table = (1 + pfs->banks) * PFS_ONE_PAGE;
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pfs->dir_table = pfs->minode_table + (pfs->banks * PFS_ONE_PAGE);
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, PFS_LABEL_AREA, pfs->label)) != 0) {
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return ret;
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}
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return 0;
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}
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s32 __osCheckId(OSPfs* pfs) {
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u8 temp[BLOCKSIZE];
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s32 ret;
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if (pfs->activebank != 0) {
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ret = __osPfsSelectBank(pfs, 0);
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if (ret == PFS_ERR_NEW_PACK) {
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ret = __osPfsSelectBank(pfs, 0);
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}
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if (ret != 0) {
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return ret;
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}
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, PFS_ID_0AREA, temp)) != 0) {
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if (ret != PFS_ERR_NEW_PACK) {
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return ret;
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}
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if ((ret = __osContRamRead(pfs->queue, pfs->channel, PFS_ID_0AREA, temp)) != 0) {
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return ret;
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}
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}
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if (bcmp(pfs->id, temp, BLOCKSIZE) != 0) {
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return PFS_ERR_NEW_PACK;
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}
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return 0;
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}
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s32 __osPfsRWInode(OSPfs* pfs, __OSInode* inode, u8 flag, u8 bank) {
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u8 sum;
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s32 j;
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s32 ret;
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s32 offset;
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u8* addr;
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if (flag == PFS_READ && bank == __osPfsInodeCacheBank && (pfs->channel == __osPfsInodeCacheChannel)) {
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bcopy(&__osPfsInodeCache, inode, sizeof(__OSInode));
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return 0;
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}
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if ((pfs->activebank != 0) && (ret = __osPfsSelectBank(pfs, 0)) != 0) {
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return ret;
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}
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offset = ((bank > 0) ? 1 : pfs->inodeStartPage);
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if (flag == PFS_WRITE) {
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inode->inodePage[0].inode_t.page =
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__osSumcalc((u8*)(inode->inodePage + offset), (PFS_INODE_SIZE_PER_PAGE - offset) * 2);
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}
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for (j = 0; j < PFS_ONE_PAGE; j++) {
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addr = (u8*)(((u8*)inode) + (j * BLOCKSIZE));
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if (flag == PFS_WRITE) {
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ret = __osContRamWrite(pfs->queue, pfs->channel, pfs->inode_table + (bank * PFS_ONE_PAGE) + j, addr, 0);
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ret = __osContRamWrite(pfs->queue, pfs->channel, pfs->minode_table + (bank * PFS_ONE_PAGE) + j, addr, 0);
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} else {
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ret = __osContRamRead(pfs->queue, pfs->channel, pfs->inode_table + (bank * PFS_ONE_PAGE) + j, addr);
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}
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if (ret) {
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return ret;
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}
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}
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if (flag == PFS_READ) {
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sum = __osSumcalc((u8*)(inode->inodePage + offset), (PFS_INODE_SIZE_PER_PAGE - offset) * 2);
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if (sum != inode->inodePage[0].inode_t.page) {
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for (j = 0; j < PFS_ONE_PAGE; j++) {
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addr = (u8*)(((u8*)inode) + (j * BLOCKSIZE));
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ret = __osContRamRead(pfs->queue, pfs->channel, pfs->minode_table + (bank * PFS_ONE_PAGE) + j, addr);
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}
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sum = __osSumcalc((u8*)(inode->inodePage + offset), (PFS_INODE_SIZE_PER_PAGE - offset) * 2);
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if (sum != inode->inodePage[0].inode_t.page) {
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return PFS_ERR_INCONSISTENT;
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}
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for (j = 0; j < PFS_ONE_PAGE; j++) {
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addr = (u8*)(((u8*)inode) + (j * BLOCKSIZE));
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ret = __osContRamWrite(pfs->queue, pfs->channel, pfs->inode_table + (bank * PFS_ONE_PAGE) + j, addr, 0);
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}
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}
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}
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__osPfsInodeCacheBank = bank;
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bcopy(inode, &__osPfsInodeCache, sizeof(__OSInode));
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__osPfsInodeCacheChannel = pfs->channel;
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return 0;
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}
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