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Shellscript improvement plus FAT driver implementations

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- Improved the run bash script to exit when an error occurs in one of the sub tasks
- Wrote basic FAT16 functions that should give enough information to properly implement the rest of the driver
- FAT structure namings are now in accordence with the microsoft spec of March 2005
This commit is contained in:
Nigel Barink
2023-02-23 23:54:02 +01:00
parent 50bf952a49
commit a77621faf5
20 changed files with 760 additions and 495 deletions
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307
kernel/storage/filesystems/FAT/FAT.cpp
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@ -4,105 +4,198 @@
#include "FAT.h"
#include "../../ata pio/ATAPIO.h"
#include "../../../memory/KernelHeap.h"
#include "../../../../CoreLib/Memory.h"
#include "../../partitiontables/mbr/MasterBootRecord.h"
#include <CoreLib/Memory.h>
void FAT::Read(PFILE file, unsigned char* buffer , unsigned int length)
superblock* FAT::Mount(filesystem *fs, const char* name ,vfsmount *mnt)
{
}
FILE FAT::Open(char* filename)
{
char* tokstate = NULL;
char* nextdir = strtok(filename, "/", &tokstate);
while (nextdir)
if( strncmp (fs->name, "fat", 3 ) != 0 )
{
// Read the root directory
printf("First entry to look for: %s\n", nextdir);
nextdir = strtok(NULL, "/", &tokstate);
printf("Can't mount filesystem with none fat type!\n");
return nullptr;
}
FILE file;
file.flags = FS_INVALID;
return file;
superblock* sb = (superblock*) malloc(sizeof(superblock));
directoryEntry* root = (directoryEntry*) malloc(sizeof (directoryEntry));
root->name = (char*) name;
root->node = nullptr;
root->parent = nullptr;
dentry_operations* op = (dentry_operations*) malloc(sizeof(dentry_operations));
op->compare = FAT::compare;
root->op = op;
mnt->mnt_count =1;
mnt->mnt_devname = "QEMU HDD";
mnt->mnt_flags = 0;
mnt->mnt_parent = nullptr;
mnt->root = root;
mnt->sb = sb;
sb->type = fs;
sb->root = root;
//sb->fs_info = getBPB();
return sb;
}
void FAT::Write(PFILE file, unsigned char* buffer, unsigned int length)
int FAT::Read(file* file, void* buffer , int length)
{
return 0;
}
void ParseDateInteger(unsigned int date){
printf("Date (hex) 0x%x\n", date);
unsigned int year = (date >> 9 )+ 1980;
unsigned int month = (date & 0xf0 ) >> 4;
unsigned int day = date & 0xf ;
printf("Date: (D,M,Y) %d, %d ,%d\n", day , month, year );
int FAT::Write(file* file, const void* buffer, int length)
{
return 0;
}
int FAT::compare (directoryEntry*, char* filename, char* filename2)
{
// use the size of the smallest string
int a = strlen(filename);
int b = strlen(filename2);
if( a == b ){
return strncmp(filename, filename2, a);
}
return a-b;
}
int FAT::create(inode* dir_node, inode** target, const char* component_name){}
int FAT::lookup (inode*, inode**, const char*){}
BiosParameterBlock* getBPB(PTR_PARTITION partition, bool DEBUG =false ){
FAT_TYPE FAT::determineFATType(BiosParameterBlock* bpb){
int RootDirSector = ((bpb->RootEntCnt * 32) + (bpb->BytsPerSec -1)) / bpb->BytsPerSec;
int FATSz = 0;
if(bpb->FATSz16 != 0){
FATSz = bpb->FATSz16;
} else{
// FATSz = bpb->FATSz32;
}
int TotSec = 0;
if(bpb->TotSec16 != 0){
TotSec= bpb->TotSec16;
}else{
TotSec = bpb->TotSec32;
}
int DataSec = TotSec - (bpb->RsvdSecCnt + (bpb->NumFATs * FATSz) + RootDirSector);
int CountofClusters = DataSec / bpb->SecPerClus;
if(CountofClusters < 4085){
return FAT_TYPE::FAT12;
} else if (CountofClusters < 65525) {
return FAT_TYPE::FAT16;
} else{
return FAT_TYPE::FAT32;
}
};
BiosParameterBlock* FAT::getBPB( bool DEBUG ){
BiosParameterBlock* bpb = (BiosParameterBlock*) malloc(sizeof(BiosParameterBlock));
ATAPIO_PORT port = (ATAPIO_PORT)(partition->Disk & 0x01FF);
DEVICE_DRIVE drive = (DEVICE_DRIVE)(partition->Disk >> 16);
printf("ATAPIO_PORT: 0x%x DEVICE_DRIVE: 0x%x\n",port, drive);
printf("Partition Start Address (LBA): 0x%x\n", partition->StartAddress);
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, partition->StartAddress, (uint16_t*) bpb);
uint16_t StartAddress = 0x00 ;
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, StartAddress, (uint16_t*) bpb);
if(DEBUG)
{
printf("OEM ID: %s\n", bpb->OEM_id);
printf("Bytes per sector: %d\n", bpb->BytesPerSector);
printf("Sectors per cluster: %d\n", bpb->SectorsPerCluster);
printf("Reserved sectors: %d\n", bpb->ReservedSectors);
printf("Number of FAT: %d\n", bpb->NumberOfFileAllocationTables);
printf("Number of Dir entries: %d\n", bpb->NumberOfDirectoryEntries);
printf("Total Sectors in volume: %d\n", bpb->TotalSectorsInLogicalVolume);
printf("Sectors per FAT: %d\n", bpb->NumberOfSectorsPerFAT);
printf("OEM ID: %s\n", bpb->OEMName);
printf("Bytes per sector: %d\n", bpb->BytsPerSec);
printf("Sectors per cluster: %d\n", bpb->SecPerClus);
printf("Reserved sectors: %d\n", bpb->RsvdSecCnt);
printf("Number of FAT: %d\n", bpb->NumFATs);
printf("Number of Dir entries: %d\n", bpb->RootEntCnt);
printf("Total Sectors in volume: %d\n", bpb->TotSec16 == 0 ? bpb->TotSec32 : bpb->TotSec16);
printf("Sectors per FAT: %d\n", bpb->FATSz16 );
}
return bpb;
}
bool FAT::Validate(PTR_PARTITION partition )
{
auto* bootParams = getBPB(partition, true);
if(bootParams->OEM_id) {
return true;
uint16_t FAT::GetFATEntry (BiosParameterBlock* bpb, unsigned int cluster){
int FATSz =0;
if(bpb->FATSz16 != 0){
FATSz = bpb->FATSz16;
} else{
//FATSz = bpb->FATSz32;
}
return false;
int FATOffset = 0;
FAT_TYPE type = FAT::determineFATType(bpb);
if( type == FAT_TYPE::FAT16){
FATOffset = cluster *2;
} else if( type == FAT_TYPE::FAT32){
FATOffset = cluster * 4;
}
int thisFATSecNum = bpb->RsvdSecCnt + (FATOffset / bpb->BytsPerSec); // Sector number containing the entry for the cluster
// For any other FAT other then the default
// SectorNumber = (FATNumber * FATSz) + ThisFATSecNum
uint16_t buff[bpb->BytsPerSec];
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, thisFATSecNum, buff );
int thisFATEntOffset = FATOffset % bpb->BytsPerSec; // offset for the entry in the sector containing the entry for the cluster
uint16_t ClusterEntryValue = 0;
// Get the FATEntry
if(type == FAT_TYPE::FAT16){
return *((uint16_t*) &buff[thisFATEntOffset]);
}
else{
// FAT32 logic
return 0;
}
}
void FAT::Info(_PARTITION *pPartition, PFS pSystem) {
pSystem->Read = FAT::Read;
pSystem->Write = FAT::Write;
pSystem->Open = FAT::Open;
uint16_t FAT::DetermineFreeSpace()
{
// Loop through all FAT entries in all FAT's
// to construct a list of free/available clusters
// Free clusters are recorded with all 0's except on FAT32 where
// the highest order 4 bits should be ignored.
/*
* The number of sectors reserved for each FAT (count of sectors in the BPB_FATSz16 or
BPB_FATSz32 fields) may be bigger than the actual number of sectors required for
containing the entire FAT. Therefore, there may be totally unused FAT sectors at the end of
each FAT in the FAT region of the volume. Each implementation must determine the value
for the last valid sector in the FAT using CountOfClusters (the last valid sector in the FAT
is the one containing the FAT entry numbered CountOfClusters + 1).
All sectors reserved for the FAT beyond the last valid sector (defined as the one containing
the FAT entry for the last cluster) must be set to 0x0 during volume initialization/format.
*/
}
uint16_t* ReadFAT (BiosParameterBlock& bpb , PTR_PARTITION partition, bool DEBUG = false ) {
uint32_t FATAddress = partition->StartAddress + bpb.ReservedSectors ;
int FAT::GetSectorOfRootDirectory (BiosParameterBlock* bpb)
{
return (bpb->RsvdSecCnt + (bpb->NumFATs * bpb->FATSz16));
}
int FAT::RootDirSize(BiosParameterBlock* bpb)
{
int size = bpb->RootEntCnt * 32;
if((size % bpb->BytsPerSec) != 0){
printf("ERR: Root entry count invalid!\n");
return -1;
}
return size;
}
uint16_t* ReadFAT (BiosParameterBlock& bpb , bool DEBUG = false ) {
uint32_t FATAddress = /*StartAddress*/ 0x00 + bpb.RsvdSecCnt ;
uint16_t* FAT = (uint16_t*)malloc(sizeof (uint16_t) * 256);
ATAPIO_PORT port = (ATAPIO_PORT)(partition->Disk & 0x01FF);
DEVICE_DRIVE drive = (DEVICE_DRIVE)(partition->Disk >> 16);
ATAPIO::Read(port, drive, FATAddress, FAT );
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, FATAddress, FAT );
// Show data in terminal
if(DEBUG){
@ -115,14 +208,15 @@ uint16_t* ReadFAT (BiosParameterBlock& bpb , PTR_PARTITION partition, bool DEBUG
return FAT;
}
void readFile(uint32_t DataRegion, DirectoryEntry* entry, uint16_t FATentry, BiosParameterBlock& bpb ){
void readFile(uint32_t DataRegion, DIR* entry, uint16_t FATentry, BiosParameterBlock& bpb ){
printf("Show contents");
printf("Start cluster of the file: 0x%x\n", entry->StartingCluster);
printf("Start cluster of the file: 0x%x\n", entry->FileSize);
printf("IS it only 1 cluster? %s\n", FATentry == 0xFFFF ? "Yes" : "No");
uint32_t sector = DataRegion + ((entry->StartingCluster - 0x02) * bpb.SectorsPerCluster);
uint32_t sector = DataRegion + ((entry->FileSize - 0x02) * bpb.SecPerClus);
uint16_t dataBlob[256];
@ -134,66 +228,21 @@ void readFile(uint32_t DataRegion, DirectoryEntry* entry, uint16_t FATentry, Bio
}
kterm_put('\n');
}
/*
void listFilesInRoot(MBR& mbr, BiosParameterBlock& bpb ){
auto FATAddress = mbr.TableEntries[0].LBA_partition_start + bpb.ReservedSectors;
uint32_t RootDirectoryRegion = FATAddress + ( bpb.NumberOfFileAllocationTables * bpb.NumberOfSectorsPerFAT );
uint32_t DataRegion = RootDirectoryRegion + ((bpb.NumberOfDirectoryEntries * 32) / bpb.BytesPerSector );
uint16_t* FAT = ReadFAT(bpb, mbr);
uint16_t data2 [256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, RootDirectoryRegion, data2 );
auto* RootDirectory = (DirectoryEntry*) data2;
// List files in root
for(int i= 0; i < sizeof (data2) / sizeof (DirectoryEntry); i++ ) {
auto *entry = (DirectoryEntry * )((uint32_t) RootDirectory + (i * sizeof(DirectoryEntry)));
if (entry->filename[0] == (uint8_t) 0x00)
continue; // There are no more entries in this directory or the entry is free
if (entry->attribute & ATTRIBUTES::ATT_HIDDEN)
continue;
if(entry->attribute & ATTRIBUTES::ATTR_SYSTEM)
continue;
if(entry->attribute & ATTRIBUTES::ATTR_VOLUME_ID)
continue;
// Print the filename;
for (char n: entry->filename) {
if (n == 0x20)
break;
kterm_put(n);
}
for (unsigned char n: entry->Extension) {
kterm_put(n);
}
kterm_put('\n');
printf("Attribute: %x \n", entry->attribute);
printf("FileSize: %d Bytes\n", entry->FilesizeInBytes);
if (entry->FilesizeInBytes != 0x0 && (entry->attribute != 0x10)) {
readFile(DataRegion,entry, FAT[i], bpb);
}
}
free(FAT);
}
FILE fsysFatDirectory (const char* DirectoryName){
FILE file;
file fsysFatDirectory (const char* DirectoryName){
file file;
unsigned char* buf;
PDIRECTORY directory;
char DosFileName[11];
ToDosFileName(DirectoryName, DosFileName, 11);
//ToDosFileName(DirectoryName, DosFileName, 11);
DosFileName[11] =0;
for (int sector=0; sector <14 ; sector++){
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, mountInfo.rootOffset + sector, (uint16_t*)buf);
ATAPIO::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, mountInfo.rootOffset + sector, (uint16_t*)buf);
directory = (PDIRECTORY) buf;
for (int i =0; i < 16; i++){
@ -209,9 +258,9 @@ FILE fsysFatDirectory (const char* DirectoryName){
file.filelength = directory->FileSize;
if(directory->Attrib == 0x10){
file.flags = FS_DIRECTORY;
file.flags = 2;
} else {
file.flags = FS_FILE;
file.flags = 1;
}
return file;
}
@ -220,7 +269,7 @@ FILE fsysFatDirectory (const char* DirectoryName){
}
// Can't find file
file.flags = FS_INVALID;
file.flags = -1;
return file;
}
@ -300,9 +349,9 @@ FILE fsysFatOpenSubDir(FILE kFile, const char* filename){
// set file type;
if(pkDir->Attrib == 0x10){
file.flags = FS_DIRECTORY;
file.flags = 2;
} else{
file.flags = FS_FILE;
file.flags = 1;
}
return file;
@ -312,7 +361,7 @@ FILE fsysFatOpenSubDir(FILE kFile, const char* filename){
}
}
// unable to find file
file.flags = FS_INVALID;
file.flags = -1;
return file;
}
*/
*/