static int hasDeviceInfoBBT() {
int bank;
int good = TRUE;
for(bank = 0; bank < Data->banksTotal; bank++) {
good = findDeviceInfoBBT(bank, NULL);
if(!good)
return FALSE;
}
return good;
}
static bool hasDeviceInfoBBT(void)
{
int bank;
bool good = true;
for(bank = 0; bank < NANDGeometry->banksTotal; bank++) {
good = findDeviceInfoBBT(bank, NULL);
if(!good)
return false;
}
return good;
}
int VFL_Open(void)
{
void* FTLCtrlBlock;
u16 buffer[3];
int bank = 0;
for(bank = 0; bank < NANDGeometry->banksTotal; bank++) {
VFLCxt* curVFLCxt;
int i;
int minUsn;
int VFLCxtIdx;
int last;
int page;
if(!findDeviceInfoBBT(bank, pstBBTArea)) {
LOG("ftl: findDeviceInfoBBT failed\n");
return -1;
}
if(bank >= NANDGeometry->banksTotal) {
return -1;
}
curVFLCxt = &pstVFLCxt[bank];
// Any VFLCxt page will contain an up-to-date list of all blocks used to store VFLCxt pages. Find any such
// page in the system area.
for(i = 1; i < FTLData->sysSuBlks; i++) {
// so pstBBTArea is a bit array of some sort
if(!(pstBBTArea[i / 8] & (1 << (i & 0x7))))
continue;
if(nand_read_vfl_cxt_page(bank, i, 0, PageBuffer, SpareBuffer) == true) {
memcpy(curVFLCxt->VFLCxtBlock, ((VFLCxt*)PageBuffer)->VFLCxtBlock, sizeof(curVFLCxt->VFLCxtBlock));
break;
}
}
if(i == FTLData->sysSuBlks) {
LOG("ftl: cannot find readable VFLCxtBlock\n");
return -1;
}
// Since VFLCxtBlock is a ringbuffer, if blockA.page0.spare.usnDec < blockB.page0.usnDec, then for any page a
// in blockA and any page b in blockB, a.spare.usNDec < b.spare.usnDec. Therefore, to begin finding the
// page/VFLCxt with the lowest usnDec, we should just look at the first page of each block in the ring.
minUsn = 0xFFFFFFFF;
VFLCxtIdx = 4;
for(i = 0; i < 4; i++) {
SpareData* spareData;
u16 block = curVFLCxt->VFLCxtBlock[i];
if(block == 0xFFFF)
continue;
if(nand_read_vfl_cxt_page(bank, block, 0, PageBuffer, SpareBuffer) != true)
continue;
spareData = (SpareData*) SpareBuffer;
if(spareData->meta.usnDec > 0 && spareData->meta.usnDec <= minUsn) {
minUsn = spareData->meta.usnDec;
VFLCxtIdx = i;
}
}
if(VFLCxtIdx == 4) {
LOG("ftl: cannot find readable VFLCxtBlock index in spares\n");
return -1;
}
// VFLCxts are stored in the block such that they are duplicated 8 times. Therefore, we only need to
// read every 8th page, and nand_read_vfl_cxt_page will try the 7 subsequent pages if the first was
// no good. The last non-blank page will have the lowest spare.usnDec and highest usnInc for VFLCxt
// in all the land (and is the newest).
last = 0;
for(page = 8; page < NANDGeometry->pagesPerBlock; page += 8) {
if(nand_read_vfl_cxt_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], page, PageBuffer, SpareBuffer) == false) {
break;
}
last = page;
}
if(nand_read_vfl_cxt_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], last, PageBuffer, SpareBuffer) == false) {
LOG("ftl: cannot find readable VFLCxt\n");
return -1;
}
// Aha, so the upshot is that this finds the VFLCxt and copies it into pstVFLCxt
memcpy(&pstVFLCxt[bank], PageBuffer, sizeof(VFLCxt));
// This is the newest VFLCxt across all banks
if(curVFLCxt->usnInc >= curVFLusnInc) {
curVFLusnInc = curVFLCxt->usnInc;
}
// Verify the checksum
if(vfl_check_checksum(bank) == false) {
LOG("ftl: VFLCxt has bad checksum\n");
return -1;
}
}
// retrieve the FTL control blocks from the latest VFL across all banks.
FTLCtrlBlock = VFL_GetFTLCtrlBlock();
// Need a buffer because eventually we'll copy over the source
memcpy(buffer, FTLCtrlBlock, sizeof(buffer));
// Then we update the VFLCxts on every bank with that information.
for(bank = 0; bank < NANDGeometry->banksTotal; bank++) {
memcpy(pstVFLCxt[bank].FTLCtrlBlock, buffer, sizeof(buffer));
vfl_gen_checksum(bank);
}
return 0;
}
static int VFL_Open() {
int bank = 0;
for(bank = 0; bank < Data->banksTotal; bank++) {
if(!findDeviceInfoBBT(bank, pstBBTArea)) {
bufferPrintf("ftl: findDeviceInfoBBT failed\r\n");
return -1;
}
if(bank >= Data->banksTotal) {
return -1;
}
VFLCxt* curVFLCxt = &pstVFLCxt[bank];
uint8_t* pageBuffer = malloc(Data->bytesPerPage);
uint8_t* spareBuffer = malloc(Data->bytesPerSpare);
if(pageBuffer == NULL || spareBuffer == NULL) {
bufferPrintf("ftl: cannot allocate page and spare buffer\r\n");
return -1;
}
int i = 1;
for(i = 1; i < Data2->field_0; i++) {
// so pstBBTArea is a bit array of some sort
if(!(pstBBTArea[i / 8] & (1 << (i & 0x7))))
continue;
if(vfl_read_page(bank, i, 0, pageBuffer, spareBuffer) == TRUE) {
memcpy(curVFLCxt->VFLCxtBlock, ((VFLCxt*)pageBuffer)->VFLCxtBlock, sizeof(curVFLCxt->VFLCxtBlock));
break;
}
}
if(i == Data2->field_0) {
bufferPrintf("ftl: cannot find readable VFLCxtBlock\r\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
int minLpn = 0xFFFFFFFF;
int VFLCxtIdx = 4;
for(i = 0; i < 4; i++) {
uint16_t block = curVFLCxt->VFLCxtBlock[i];
if(block == 0xFFFF)
continue;
if(vfl_read_page(bank, block, 0, pageBuffer, spareBuffer) != TRUE)
continue;
SpareData* spareData = (SpareData*) spareBuffer;
if(spareData->logicalPageNumber > 0 && spareData->logicalPageNumber <= minLpn) {
minLpn = spareData->logicalPageNumber;
VFLCxtIdx = i;
}
}
if(VFLCxtIdx == 4) {
bufferPrintf("ftl: cannot find readable VFLCxtBlock index in spares\r\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
int page = 8;
int last = 0;
for(page = 8; page < Data->pagesPerBlock; page += 8) {
if(vfl_read_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], page, pageBuffer, spareBuffer) == FALSE) {
break;
}
last = page;
}
if(vfl_read_page(bank, curVFLCxt->VFLCxtBlock[VFLCxtIdx], last, pageBuffer, spareBuffer) == FALSE) {
bufferPrintf("ftl: cannot find readable VFLCxt\n");
free(pageBuffer);
free(spareBuffer);
return -1;
}
// Aha, so the upshot is that this finds the VFLCxt and copies it into pstVFLCxt
memcpy(&pstVFLCxt[bank], pageBuffer, sizeof(VFLCxt));
if(curVFLCxt->field_0 >= VFLData4) {
VFLData4 = curVFLCxt->field_0;
}
free(pageBuffer);
free(spareBuffer);
if(vfl_check_checksum(bank) == FALSE) {
bufferPrintf("ftl: VFLCxt has bad checksum\n");
return -1;
}
}
void* maxThing = VFL_get_maxThing();
uint16_t buffer[3];
memcpy(buffer, maxThing, 6);
for(bank = 0; bank < Data->banksTotal; bank++) {
memcpy(pstVFLCxt[bank].field_4, buffer, sizeof(buffer));
vfl_gen_checksum(bank);
}
return 0;
}