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FAT Filesystem implementation additions

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This commit is contained in:
Nigel Barink 2023-10-27 18:07:11 +02:00
parent 64c87a2a58
commit e82392e9d9
7 changed files with 101 additions and 74 deletions
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2
CoreLib/Makefile
View File

@ -15,8 +15,6 @@ $(OUTPUTFILE): $(OFILES)
pwd
ar -rc $(OUTPUTFILE) $(OFILES)
$(OBJ_FOLDER)/ctype.o: ctype.cpp
$(CPP) -c ctype.cpp -o $(OBJ_FOLDER)/ctype.o $(CFLAGS)

33
kernel/kernel.cpp
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@ -42,43 +42,33 @@ extern "C" void kernel ()
{
init_serial();
kterm_init();
print_serial("kterm initialized...\n");
setup_tss();
initGDT();
initidt();
LoadGlobalDescriptorTable();
flush_tss();
printf("Memory setup complete!\n");
print_serial("Memory initialized....\n");
// Enable interrupts
asm volatile("STI");
initHeap();
pit_initialise();
ACPI::initialize();
PCI::Scan();
print_serial("Heap initialized...\n");
//pit_initialise();
//ACPI::initialize();
//PCI::Scan();
processor::initialize();
processor::enable_protectedMode();
initBootDrive();
VirtualFileSystem::initialize();
print_serial("Run test!");
#define VFS_EXAMPLE
#ifdef VFS_EXAMPLE
auto fontFile = VirtualFileSystem::open("/FONT PSF", 0);
if(grubcfg->flags == 0){
uint16_t* contents = (uint16_t*) malloc(sizeof(uint16_t) * 256);
grubcfg->read(grubcfg, contents, 512);
for(int i =0 ; i < grubcfg->root->size; i++ ){
kterm_put(contents[i] & 0x00ff);
kterm_put(contents[i] >> 8);
}
kterm_put('\n');
free((void*)contents);
}else{
printf("Could not find file\n");
}
printf("Size of font file: %d bytes", fontFile->root->size); // COOL This Works like a charm
#endif
#ifdef USERMODE_RELEASE
@ -86,6 +76,7 @@ extern "C" void kernel ()
jump_usermode();
#else
startSuperVisorTerminal();
#endif
}

56
kernel/memory/VirtualMemoryManager.cpp
View File

@ -1,4 +1,6 @@
#include "VirtualMemoryManager.h"
#include "../../CoreLib/Memory.h"
#define ALIGN(addr, align) (((addr) & ~((align) - 1 )) + (align))
extern uint32_t boot_page_directory[1024] ; // points to the wrong location
@ -14,7 +16,7 @@ void flush_cr3(){
void AllocatePage(uint32_t vaddr)
{
uint32_t page_aligned_address = ALIGN(vaddr, 4096);
//uint32_t page_aligned_address = ALIGN(vaddr, 4096);
// allocate a page at virtual address
int PageDirectoryEntryIndex = vaddr >> 22;
@ -54,16 +56,16 @@ void AllocatePage(uint32_t vaddr)
void FreePage(uint32_t vaddr )
{
uint32_t page_aligned_address = ALIGN(vaddr, 4096);
// uint32_t page_aligned_address = ALIGN(vaddr, 4096);
// allocate a page at virtual address
int PageDirectoryEntryIndex = vaddr >> 22;
int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
uint32_t* pageTable = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000 + 0xC0000000);
uint32_t* pageTable = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & (0xFFFFE000 + 0xC0000000));
void* physicalAddressToFree = (void*)(pageTable[PageTableEntryIndex] & 0xFFFFE000 + 0xC0000000);
void* physicalAddressToFree = (void*)(pageTable[PageTableEntryIndex] & (0xFFFFE000 + 0xC0000000));
free_block(physicalAddressToFree);
pageTable[PageTableEntryIndex] = 0x0;
@ -80,9 +82,9 @@ void Immediate_Map ( uint32_t vaddr, uint32_t paddr)
int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
printf("Map address at PDE 0x%x PTE 0x%x\n", PageDirectoryEntryIndex, PageTableEntryIndex);
if ((boot_page_directory - 0xC0000000)[PageDirectoryEntryIndex] & 0x1 )
{
printf("boot pagedirectoy address: 0x%x\n", &boot_page_directory);
printf("PDE : 0x%x\n", boot_page_directory[PageTableEntryIndex]);
if (boot_page_directory[PageDirectoryEntryIndex] & 0x1 ) {
printf("Directory entry is marked as present\n");
} else {
@ -90,37 +92,39 @@ void Immediate_Map ( uint32_t vaddr, uint32_t paddr)
// mark the page table as present and allocate a physical block for it
void* new_page_dir = allocate_block();
printf("New page directory address 0x%x\n", new_page_dir);
memset(new_page_dir, 0 , 1024 * sizeof (uint32_t));
printf("New page directory address 0x%x\n", &new_page_dir);
boot_page_directory[PageDirectoryEntryIndex] = (uint32_t)new_page_dir | 0x3;
}
printf("PDE found at : 0x%x\n", (uint32_t) &boot_page_directory[PageDirectoryEntryIndex]);
uint32_t* page_table = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000) ;
//page_table = (uint32_t*) ((uint32_t)page_table - 0xC0000000); // remove kernel offset
printf("Page table address: 0x%x\n", (uint32_t)page_table);
uint32_t* page_table = (uint32_t*)(boot_page_directory[PageDirectoryEntryIndex] & 0xFFFFE000) ;
printf("Page table address: 0x%x\n", (uint32_t)page_table);
// check if the page table entry is marked as present
if ( page_table[PageTableEntryIndex] & 0x1 )
{
printf("page already present!\n");
printf("Entry found at addr: 0x%x\n", &(page_table[PageTableEntryIndex]));
} else{
printf("Mapping a physical page.\n");
// Map the entry to a physical page
page_table[PageTableEntryIndex] = (uint32_t)(paddr | 0x3);
}
// check if the page table entry is marked as present
if ( page_table[PageTableEntryIndex] & 0x1 )
{
printf("page already present!\n");
printf("Entry found at addr: 0x%x\n", &(page_table[PageTableEntryIndex]));
} else{
printf("Mapping a physical page.\n");
// Map the entry to a physical page
page_table[PageTableEntryIndex] = (uint32_t)(paddr | 0x3);
}
asm ("cli; invlpg (%0); sti" :: "r" (vaddr) : "memory" );
asm ("invlpg (%0)" :: "r" (vaddr) : "memory" );
}
// NOT IMPLEMENTED
void Immediate_Unmap(uint32_t vaddr)
{
// NOTE: I will implement lazy unmapping for now
uint32_t page_aligned_address = ALIGN(vaddr, 4096);
//uint32_t page_aligned_address = ALIGN(vaddr, 4096);
// allocate a page at virtual address
int PageDirectoryEntryIndex = vaddr >> 22;
int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
//int PageDirectoryEntryIndex = vaddr >> 22;
//int PageTableEntryIndex = (vaddr >> 12) & 0x1FFF;
}

18
kernel/storage/filesystems/FAT/FAT.cpp
View File

@ -107,10 +107,10 @@ DirectoryNode* FAT::Lookup (inode* currentDir , DirectoryNode* dir)
for(int i = 0; i < sizeof(data) / sizeof (DIR); i++)
{
DIR* entry = (DIR*)((uint32_t)directory + (i * sizeof(DIR)));
if(
entry->Name[0] == FAT::FREE_DIR ||
entry->Name[0] == FAT::FREE_DIR_2 ||
entry->Name[0] == 0xE5 ||
entry->ATTR & FAT::ATTRIBUTES::ATTR_VOLUME_ID ||
entry->ATTR & FAT::ATTRIBUTES::ATTR_SYSTEM ||
entry->ATTR & FAT::ATTRIBUTES::ATTR_HIDDEN
@ -118,6 +118,20 @@ DirectoryNode* FAT::Lookup (inode* currentDir , DirectoryNode* dir)
continue;
}
if( entry->ATTR & FAT::ATTRIBUTES::ATTR_DIRECTORY){
printf("entry in directory\n");
for(int i = 0; i < 11 ;i ++)
kterm_put(entry->Name[i]);
kterm_put('\n');
}
if( entry->Name[0] == FAT::FREE_DIR_2 )
break;
auto* dirNode = (DirectoryNode*) malloc(sizeof (DirectoryNode));
char* name = (char*)malloc(sizeof(char[11]));

16
kernel/storage/partitiontables/mbr/MasterBootRecord.h
View File

@ -22,22 +22,22 @@ inline MBR* GetPartitions(bool DEBUG = false){
int S =1;
uint32_t LBA = (C*HPC+H) * SPT + (S-1);
MBR* mbr =(MBR*) malloc(sizeof (MBR));
uint16_t* mbr =(uint16_t*) malloc(sizeof (MBR));
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, LBA, (uint16_t*)mbr);
ATAPIO::Read(ATAPIO_PORT::Primary, DEVICE_DRIVE::MASTER, LBA, mbr );
auto bootRecord = (MBR*)(mbr);
printf("MBR (In Memory) Address 0x%x, Size = %d\n", mbr, sizeof (MBR));
printf("MBR (In Memory) Address 0x%x, Size = %d\n", bootRecord, sizeof (MBR));
if(DEBUG){
printf("BootSector: 0x%x\n", mbr->ValidBootsector );
printf("BootSector: 0x%x\n", bootRecord->ValidBootsector );
for( int i = 0 ; i < 4 ; i ++){
PartitionTableEntry PT = mbr->TableEntries[i];
PartitionTableEntry PT = bootRecord->TableEntries[i];
printf("Partition %d [ %d sectors, PartitionType: 0x%x, 0x%x, \nLBA Start: 0x%x ]\n" ,
i, PT.Number_sectors_inPartition, PT.PartitionType, mbr->uniqueID, PT.LBA_partition_start );
i, PT.Number_sectors_inPartition, PT.PartitionType, bootRecord->uniqueID, PT.LBA_partition_start );
}
}
return mbr;
return bootRecord;
}

21
kernel/storage/vfs/vfs.cpp
View File

@ -80,20 +80,37 @@ FILE* VirtualFileSystem::open(const char* pathname, int flags){
}
// let's just loop through the folder first
printf("looking for: ");
for(int i = 0; i < 5; i++)
kterm_put(nextdir[i]);
kterm_put('\n');
auto* child = rootentry->children;
while(child->next != nullptr){
auto* directory = (DirectoryNode*)child->data;
for(int i = 0; i < 11 ; i++)
kterm_put(directory->name[i]);
kterm_put('\n');
if( directory->compare(directory, directory->name, nextdir) == 0){
nextdir = strtok(nullptr, "/", &tokstate);
printf("Found dir!\n");
if(nextdir == NULL){
file->root = directory->node;
file->flags =0;
file->read = FAT::Read;
return file;
}
printf("continue searching next directory!\n");
if(directory->children == nullptr)
directory->node->lookup(directory->node, directory);
child = directory->children;
}else{
child = child->next;
}
child = child->next;
}

29
kernel/terminal/kterm.cpp
View File

@ -21,7 +21,14 @@ void kterm_init () {
kterm_row = 0;
kterm_column = 0;
kterm_color = vga_entry_color ( VGA_COLOR_LIGHT_GREY , VGA_COLOR_BLACK);
kterm_buffer = (uint16_t*) 0xC03FF000;
//Physical address
// 0xB8000
// Virtual address
// 0xC03FF000
//kterm_buffer = ((uint16_t*) 0xB8000);
kterm_buffer = ((uint16_t*) 0xC03FF000 );
for (size_t y = 0; y < VGA_HEIGHT; y++ ){
for( size_t x = 0; x < VGA_WIDTH; x++){
@ -59,7 +66,6 @@ void disable_cursor()
outb(0x3D5, 0x20);
}
void update_cursor(int x, int y){
uint16_t pos = y * VGA_WIDTH + x;
@ -86,8 +92,6 @@ int get_cursor_y (uint16_t cursor_pos ) {
return cursor_pos / VGA_WIDTH;
}
/**
* With the help from:
* https://whiteheadsoftware.dev/operating-systems-development-for-dummies/
@ -134,7 +138,6 @@ void kterm_writestring(const char* data ){
kterm_write(data, strlen(data));
}
static void itoa (char *buf, int base, int d) {
char *p = buf;
char *p1, *p2;
@ -173,28 +176,28 @@ static void itoa (char *buf, int base, int d) {
void printf ( const char *format, ...) {
char **arg = (char **)&format;
auto **arg = (unsigned char **)&format;
int c;
char buf[20];
arg++;
while ((c = *format++) != 0){
while ((c = *(const unsigned char*)format++) != 0){
if( c != '%')
kterm_put(c);
else{
char *p, *p2;
char const *p, *p2;
int pad0 = 0, pad = 0;
c = *format++;
c = *(const unsigned char*)format++;
if(c =='0'){
pad0 = 1;
c = *format++;
c = *(const unsigned char*)format++;
}
if ( c >= '0' && c <= '9'){
pad = c - '0';
c = *format++;
c = *(const unsigned char*)format++;
}
switch (c)
@ -210,7 +213,7 @@ void printf ( const char *format, ...) {
break;
case 's':
p = *arg++;
p = (char const *)*arg++;
if(!p)
p = "(null)";
@ -224,7 +227,7 @@ void printf ( const char *format, ...) {
default:
kterm_put(*((int *)arg++));
kterm_put(*(int *) arg++); // NOLINT(cppcoreguidelines-narrowing-conversions)
break;
}
}