Nigel
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BarinkOS
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Reading files from disk 

- Modified makefile to start the virtualbox vm on `make run`
- Listing files in rootdirectory with their properties and
	content
dev
Nigel Barink 2021-12-27 19:35:24 +01:00
parent b8d75dddae
commit 19b9cfe908
6 changed files with 148 additions and 48 deletions
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4
Makefile
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@ -50,7 +50,9 @@ iso: clean_iso clean build
cp build/myos.bin root/boot/myos.bin
cp src/grub.cfg root/boot/grub/grub.cfg
grub-mkrescue -o build/barinkOS.iso root
run: all
virtualboxvm --startvm "BarinkOS_test"
test:
$(EMULATOR) -kernel $(BUILD_DIR)/myos.bin -serial stdio -vga std -display gtk -m 2G -cpu core2duo

0
src/kernel/filesytems/FAT32/BiosParameterBlock.h → src/kernel/filesytems/FAT/BiosParameterBlock.h
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19
src/kernel/filesytems/FAT/DirectoryEntry.h Normal file
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@ -0,0 +1,19 @@
#pragma once
#include <stdint.h>
struct DirectoryEntry {
uint8_t filename [8];
uint8_t Extension [3];
uint8_t attribute;
uint8_t Reserved;
uint8_t creation;
uint16_t CreationTime;
uint16_t CreationDate;
uint16_t LastAccessDate;
uint16_t ReservedFAT32;
uint16_t LastWriteTime;
uint16_t LastWriteDate;
uint16_t StartingCluster;
uint32_t FilesizeInBytes;
}__attribute__((packed));

0
src/kernel/filesytems/FAT32/ExtendBootRecord.h → src/kernel/filesytems/FAT/ExtendBootRecord.h
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168
src/kernel/kernel.cpp
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@ -3,40 +3,17 @@
#define GB2 262144
extern "C" void kernel_main (void);
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);
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);
}
initGDT();
kernel_main();
}
extern "C" void kernel_main (void) {
@ -96,11 +73,11 @@ extern "C" void kernel_main (void);
i, PT.Number_sectors_inPartition, PT.PartitionType, mbr->uniqueID, PT.LBA_partition_start );
}
// Find the super block
uint16_t superBlock[256];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER, mbr->TableEntries[0].LBA_partition_start, superBlock);
// 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*) superBlock;
BiosParameterBlock* bpb = (BiosParameterBlock*) biosparameterblock;
printf("\nBPB: Bytes per Sector %d\n", bpb->BytesPerSector );
@ -113,23 +90,124 @@ extern "C" void kernel_main (void);
printf("Total Sectors in volume: %d\n", bpb->TotalSectorsInLogicalVolume);
printf("Sectors per FAT: %d\n", bpb->NumberOfSectorsPerFAT);
uint32_t PartitionAddress = mbr->TableEntries[0].LBA_partition_start *512 ;
uint32_t RootDirAddress = PartitionAddress + ((bpb->ReservedSectors + bpb->NumberOfSectorsPerFAT * bpb->NumberOfFileAllocationTables ) * bpb->BytesPerSector);
uint32_t RootDirLBA =RootDirAddress/512;
uint16_t RootDir [16];
ATA_DEVICE::Read(BUS_PORT::Primary, DEVICE_DRIVE::MASTER,RootDirLBA, (uint16_t*) RootDir );
/**
* @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 );
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);
// 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();
}

5
src/kernel/kernel.h
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@ -22,8 +22,9 @@ extern "C"{
#include "ide/ide.h"
#include "./drivers/IO/ata/ataDevice.h"
#include "./PartitionTable/MBR/MasterBootRecord.h"
#include "./filesytems/FAT32/BiosParameterBlock.h"
#include "./filesytems/FAT32/ExtendBootRecord.h"
#include "./filesytems/FAT/BiosParameterBlock.h"
#include "./filesytems/FAT/ExtendBootRecord.h"
#include "./filesytems/FAT/DirectoryEntry.h"
#include "drivers/ACPI/rsdp.h"