BarinkOS/src/kernel/kernel.cpp
Nigel 19b9cfe908 Reading files from disk
- Modified makefile to start the virtualbox vm on `make run`
- Listing files in rootdirectory with their properties and
	content
2021-12-27 19:35:24 +01:00

214 lines
6.8 KiB
C++

#include "kernel.h"
#define GB4 524288
#define GB2 262144
extern "C" void wait_until_shutdown(){
while (true){
//Read time indefinetely
read_rtc();
printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
delay(1000);
}
}
extern "C" void kernel_main (void) {
printf("call to init serial\n");
init_serial();
print_serial("Serial port initialized!");
RSDPTR* rsd = FindRSD();
RSDT* rsd_table = getRSDT(rsd);
// Enumerate the PCI bus
PCI_Enumerate();
TestIDEController();
int devNumber = 0 ;
for ( auto device : ide_devices){
if (!device.Reserved)
continue;
printf("Device %d\n" , devNumber);
printf (" Device on Channel: (0x%x) %s\n" ,device.Channel, device.Channel == 0 ? "Primary" : "Secondary");
printf (" Device drive:(0x%x) %s\n" , device.Drive, device.Drive? "Slave" : "Master");
printf (" Device Type:(0x%x) %s\n" , device.Type, device.Type ? "ATAPI" : "ATA");
devNumber ++;
}
enum BUS_PORT {
Primary= 0x1f0,
Secondary = 0x170
};
ATA_DEVICE::Identify((uint16_t) BUS_PORT::Primary, DEVICE_DRIVE::MASTER);
const int C = 0;
const int H = 0;
const int HPC = 16;
const int SPT = 63;
int S = 1;
uint32_t LBA = (C*HPC+H) * SPT + (S-1);
printf("LBA: %d\n" , LBA);
uint16_t buffer [256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, LBA, buffer);
MBR* mbr = (MBR*) buffer;
printf("BootSector: 0x%x\n", mbr->ValidBootsector );
for( int i = 0 ; i < 4 ; i ++){
PartitionTableEntry PT = mbr->TableEntries[i];
printf("Partition %d [ %d sectors, PartitionType: %x, 0x%x, \nLBA Start: 0x%x ]\n" ,
i, PT.Number_sectors_inPartition, PT.PartitionType, mbr->uniqueID, PT.LBA_partition_start );
}
// Find the BiosParameter block
uint16_t biosparameterblock[256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, mbr->TableEntries[0].LBA_partition_start, biosparameterblock);
BiosParameterBlock* bpb = (BiosParameterBlock*) biosparameterblock;
printf("\nBPB: Bytes per Sector %d\n", bpb->BytesPerSector );
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);
/**
* @brief File Allocation Table
*/
uint32_t FATAddress = mbr->TableEntries[0].LBA_partition_start + bpb->ReservedSectors ;
uint16_t FAT[256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, FATAddress, FAT );
// Show data in terminal
for(int i = 0; i < 256; i++ ) {
printf("%x ", FAT[i]);
}
kterm_put('\n');
uint32_t RootDirectoryRegion = FATAddress + ( bpb->NumberOfFileAllocationTables * bpb->NumberOfSectorsPerFAT );
uint32_t DataRegion = RootDirectoryRegion + ((bpb->NumberOfDirectoryEntries * 32) / bpb->BytesPerSector );
uint16_t data2 [256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, RootDirectoryRegion, data2 );
DirectoryEntry* RootDirectory = (DirectoryEntry*) data2;
// List files in root
for(int i= 0; i < bpb->NumberOfDirectoryEntries ; i++ )
{
DirectoryEntry* entry = (DirectoryEntry*)((uint32_t) RootDirectory + (i * sizeof(DirectoryEntry)));
if( entry->filename[0] == (uint8_t) 0x00 )
break; // There are no more entries in this directory or the entry is free
if( entry->attribute & 0x01 == 0x01 || entry->attribute & 0x20 == 0x20)
continue; // Skip listing if hidden or Achieve flag is set
// Print the filename;
for( int n = 0; n < 8; n++ ){
if(entry->filename[n] == 0x20)
break;
kterm_put(entry->filename[n]);
}kterm_put('\n');
for( int n = 0; n < 3; n++){
kterm_put(entry->Extension[n]);
}kterm_put('\n');
printf("Attribute: %x \n" , entry->attribute);
printf("FileSize: %d Bytes\n", entry->FilesizeInBytes);
if( entry->FilesizeInBytes != 0x0 || entry->attribute & 0x8 == 0x0){
printf("Show contents");
printf( "Start cluster of the file: 0x%x\n" , entry->StartingCluster);
printf("IS it only 1 cluster? %s\n" , FAT[i] == 0xFFFF? "Yes": "No" );
uint32_t sector = DataRegion + ((entry->StartingCluster - 0x02 ) * bpb->SectorsPerCluster);
uint16_t dataBlob [256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, sector, dataBlob );
for( int n = 0; n < 256; n++)
{
kterm_put(dataBlob[n] & 0x00ff);
kterm_put(dataBlob[n] >> 8);
}kterm_put('\n');
}
printf("======================\n");
}
wait_until_shutdown();
}
extern "C" void early_main(unsigned long magic, unsigned long addr){
/** initialize terminal interface */
kterm_init();
if (magic != MULTIBOOT_BOOTLOADER_MAGIC){
printf("Invalid magic number: 0x%x\n", magic);
return;
}
CheckMBT( (multiboot_info_t *) addr);
multiboot_info_t* mbt = (multiboot_info_t*) addr;
/* Are mmap_* valid? */
if (CHECK_FLAG(mbt->flags, 6)){
PhysicalMemoryManager_initialise( mbt->mmap_addr, GB2/* Seriously dangerous hardcoded memory value*/);
PhysicalMemoryManager_initialise_available_regions(mbt->mmap_addr, mbt->mmap_addr + mbt->mmap_length);
PhysicalMemoryManager_deinitialise_kernel();
extern uint8_t* kernel_begin;
extern uint8_t* kernel_end;
printf("Kernel MemoryMap:\n");
printf("kernel: 0x%x - 0x%x\n", &kernel_begin , &kernel_end);
}
initGDT();
kernel_main();
}