Shellscript improvement plus FAT driver implementations

- 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:
2023-02-23 23:54:02 +01:00
parent 50bf952a49
commit a77621faf5
20 changed files with 760 additions and 495 deletions

View File

@ -15,6 +15,8 @@
#include "interrupts/idt.h"
#include "serial.h"
#include "storage/vfs/vfs.h"
#include "storage/filesystems/FAT/FAT.h"
extern "C" void LoadGlobalDescriptorTable();
extern "C" void jump_usermode();
@ -54,20 +56,83 @@ extern "C" void kernel ()
printf("booted from floppy disk\n");
printf("Part1: %d, Part2: %d, Part3: %d\n", part1, part2 , part3);
ATAPIO::Identify(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER);
auto* bpb = FAT::getBPB(false);
auto* mbr = GetPartitions(false);
auto fsType = FAT::determineFATType(bpb);
switch (fsType) {
case FAT_TYPE::FAT12:
printf("FAT12 Disk!\n");
break;
case FAT_TYPE::FAT16:
printf("FAT16 Disk!\n");
break;
case FAT_TYPE::FAT32:
printf("FAT32 Disk!\n");
break;
}
VirtualFileSystem::initialize();
// list files in root
int total_sectors = bpb->TotSec32;
int fat_size = bpb->FATSz16;
int root_dir_sectors = FAT::RootDirSize(bpb);
int first_data_sector = bpb->RsvdSecCnt + (bpb->NumFATs * fat_size) + root_dir_sectors ;
int first_fat_sector = bpb->RsvdSecCnt;
int data_sectors = bpb->TotSec32 - (bpb->RsvdSecCnt + (bpb->NumFATs * fat_size) + root_dir_sectors);
int total_clusters = data_sectors / bpb->SecPerClus;
// Try and open hello.txt file
VirtualFileSystem::OpenFile("a:hello.txt");
int first_root_dir_sector = first_data_sector - root_dir_sectors;
//int first_sector_of_cluster = ((cluster - 2) * bpb->SecPerClus) + first_data_sector;
uint16_t data[256];
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, first_root_dir_sector, data);
auto* RootDirectory = (DIR*)data;
for(int i = 0; i < sizeof(data) / sizeof (DIR); i++)
{
DIR* entry = (DIR*)((uint32_t)RootDirectory + (i * sizeof(DIR)));
if(entry->Name[0] == FAT::FREE_DIR || entry->Name[0] == FAT::FREE_DIR_2 || entry->Name[0] == 0xE5){
continue;
}
if(entry->ATTR & FAT::ATTRIBUTES::ATTR_HIDDEN){
continue;
}
if(entry->ATTR & FAT::ATTRIBUTES::ATTR_SYSTEM)
continue;
if(entry->ATTR & FAT::ATTRIBUTES::ATTR_VOLUME_ID){
continue;
}
if (!(entry->ATTR & FAT::ATTRIBUTES::ATTR_LONG_NAME)){
for(char n : entry->Name){
if(n == 0x20)
continue;
kterm_put(n);
}
}else{
printf("Long file name detected!\n");
}
printf(" [Size: %d bytes, Attributes: %x\n", entry->ATTR, entry->FileSize);
}
// Try and open grub.cfg file
VirtualFileSystem::OpenFile("a:boot/grub/grub.cfg");
// VirtualFileSystem::initialize();
// VirtualFileSystem::open("/hello.txt", 0);
#ifdef USERMODE_RELEASE
// Lets jump into user mode
jump_usermode();