/*
* Initialize the disk driver.
* Read the partition table.
*/
static void ideInitialize(void) {
unsigned int totalSectors;
/* determine disk size */
waitDiskReady();
totalSectors = *DISK_CAP;
if (totalSectors == 0) {
panic("IDE disk not found");
}
/* read partition table */
readPartitionTable();
if (debugIdeDisk) {
printf("IDE disk has %d (0x%X) sectors\n",
totalSectors, totalSectors);
showPartitionTable();
}
/* disk queue is empty */
ideTab.b_actf = NULL;
ideTab.b_actl = NULL;
/* no disk operation in progress, no errors */
ideTab.b_active = 0;
ideTab.b_errcnt = 0;
/* set ISR and enable interrupts */
setISR(DISK_IRQ, ideISR);
setMask(getMask() | (1 << DISK_IRQ));
/* the disk is now initialized */
ideInitialized = TRUE;
}
PartitionEntry* FileSystem::getPartitionTable(int sector, int sectorOffset) {
PartitionEntry *entry = NULL;
PartitionEntry *first = NULL;
// MBR or EBR
int partitionQt;
if (sectorOffset == 0){
partitionQt= 4;
} else {
partitionQt= 2;
}
for (int i = 1; i <= partitionQt; i++) {
PartitionEntry *temp = readPartitionTable(sector, i, sectorOffset);
if (entry == NULL) {
entry = temp;
first = entry;
} else if (temp != NULL) {
entry->next = temp;
entry = entry->next;
}
}
PartitionEntry *temp = first;
PartitionEntry *end = entry;
while (temp != end->next) {
if (temp->type == EXTENDED_PARTITION) {
if (extBootRecordOffset == 0)
extBootRecordOffset = temp->startSector;
entry->next = getPartitionTable(temp->startSector, temp->startSector);
PartitionEntry *current = entry->next;
PartitionEntry *prev = entry;
while (current != NULL) {
if (current->type == EXTENDED_PARTITION || current->type == 0) {
if (current->next == NULL) {
free(current);
prev->next = NULL;
} else {
prev->next = current->next;
free(current);
current = prev->next;
continue;
}
}
prev = current;
current = current->next;
}
}
while (entry->next != NULL)
entry = entry->next;
temp = temp->next;
}
return first;
}
