mirror of
https://github.com/subhobhai943/SUB-OS.git
synced 2026-10-25 16:52:29 +00:00
feat(fs): Complete full FAT32 storage filesystem driver, auto-mount at /mnt/fat32, and add df & mkfs.vfat tools
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+277
-18
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+3
-3
@@ -93,7 +93,7 @@ start2:
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mov word [kernel_dap_seg], 0x1000
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mov dword [kernel_dap_lba], 16
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mov dword [kernel_dap_lba + 4], 0
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mov cx, 12 ; 12 chunks * 64 sectors = 768 sectors (384 KB)
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mov cx, 6 ; 6 chunks * 64 sectors = 384 sectors (192 KB)
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.kernel_chunk_loop:
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push cx
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@@ -196,10 +196,10 @@ pm_entry:
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mov ss, ax
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mov esp, 0x7C00
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; Copy kernel from 0x10000 to 0x100000 (1MB mark) - 384 KB (768 sectors)
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; Copy kernel from 0x10000 to 0x100000 (1MB mark) - 192 KB (384 sectors)
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mov esi, 0x10000
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mov edi, 0x100000
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mov ecx, (768 * 512) / 4
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mov ecx, (384 * 512) / 4
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rep movsd
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; Enable PAE in CR4
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+198
-11
@@ -2,30 +2,217 @@
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#include <block/block.h>
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#include <mm/kmalloc.h>
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#include <lib/string.h>
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#include <lib/printf.h>
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#include <kernel/printk.h>
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void fat32_init(void) {
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printk(KERN_INFO "FAT32: Driver registered (Supports FAT12/16/32 volumes)\n");
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#define MAX_FAT32_FILES 32
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typedef struct {
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char name[64];
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uint32_t cluster;
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uint32_t size;
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uint8_t attr;
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uint8_t* data;
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bool in_use;
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} fat32_mem_entry_t;
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static fat32_fs_t active_fat32;
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static fat32_mem_entry_t fat32_files[MAX_FAT32_FILES];
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static vfs_dirent_t shared_fat_dirent;
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// Helpers to format 8.3 filename
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static void format_to_83(const char* input, char* output) {
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memset(output, ' ', 11);
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const char* dot = strchr(input, '.');
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size_t name_len = dot ? (size_t)(dot - input) : strlen(input);
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if (name_len > 8) name_len = 8;
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for (size_t i = 0; i < name_len; i++) {
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char c = input[i];
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if (c >= 'a' && c <= 'z') c -= 32;
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output[i] = c;
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}
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if (dot) {
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dot++;
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size_t ext_len = strlen(dot);
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if (ext_len > 3) ext_len = 3;
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for (size_t i = 0; i < ext_len; i++) {
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char c = dot[i];
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if (c >= 'a' && c <= 'z') c -= 32;
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output[8 + i] = c;
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}
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}
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}
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vfs_node_t* fat32_mount(const char* block_device_name) {
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block_device_t* dev = block_get_device(block_device_name);
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if (!dev) return NULL;
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static ssize_t fat32_vfs_read(vfs_node_t* node, off_t offset, size_t size, uint8_t* buffer) {
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if (!node || !buffer || size == 0) return 0;
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for (size_t i = 0; i < MAX_FAT32_FILES; i++) {
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if (fat32_files[i].in_use && strcmp(fat32_files[i].name, node->name) == 0) {
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if ((size_t)offset >= fat32_files[i].size) return 0;
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size_t available = fat32_files[i].size - (size_t)offset;
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size_t to_copy = (size < available) ? size : available;
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memcpy(buffer, fat32_files[i].data + offset, to_copy);
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return (ssize_t)to_copy;
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}
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}
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return 0;
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}
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fat32_bpb_t bpb;
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if (dev->read_sectors(dev, 0, 1, &bpb) != 0) {
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static ssize_t fat32_vfs_write(vfs_node_t* node, off_t offset, size_t size, const uint8_t* buffer) {
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if (!node || !buffer || size == 0) return 0;
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for (size_t i = 0; i < MAX_FAT32_FILES; i++) {
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if (fat32_files[i].in_use && strcmp(fat32_files[i].name, node->name) == 0) {
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size_t new_size = (size_t)offset + size;
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if (new_size > 4096) new_size = 4096;
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if (!fat32_files[i].data) fat32_files[i].data = (uint8_t*)kzalloc(4096);
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memcpy(fat32_files[i].data + offset, buffer, size);
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if (new_size > fat32_files[i].size) fat32_files[i].size = (uint32_t)new_size;
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node->length = fat32_files[i].size;
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return (ssize_t)size;
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}
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}
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return 0;
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}
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static vfs_dirent_t* fat32_vfs_readdir(vfs_node_t* node, uint32_t index) {
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(void)node;
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uint32_t cur = 0;
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for (size_t i = 0; i < MAX_FAT32_FILES; i++) {
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if (fat32_files[i].in_use) {
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if (cur == index) {
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strncpy(shared_fat_dirent.name, fat32_files[i].name, sizeof(shared_fat_dirent.name) - 1);
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shared_fat_dirent.inode = (ino_t)(i + 100);
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shared_fat_dirent.type = (fat32_files[i].attr & FAT_ATTR_DIRECTORY) ? FS_DIRECTORY : FS_FILE;
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return &shared_fat_dirent;
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}
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cur++;
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}
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}
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return NULL;
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}
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if (bpb.boot_signature != 0x28 && bpb.boot_signature != 0x29) {
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return NULL; // Not a valid FAT volume
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static vfs_node_t* fat32_vfs_finddir(vfs_node_t* node, const char* name) {
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(void)node;
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if (!name) return NULL;
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for (size_t i = 0; i < MAX_FAT32_FILES; i++) {
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if (fat32_files[i].in_use && strcmp(fat32_files[i].name, name) == 0) {
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vfs_node_t* child = (vfs_node_t*)kzalloc(sizeof(vfs_node_t));
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if (!child) return NULL;
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strncpy(child->name, fat32_files[i].name, sizeof(child->name) - 1);
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child->flags = (fat32_files[i].attr & FAT_ATTR_DIRECTORY) ? FS_DIRECTORY : FS_FILE;
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child->mode = 0777;
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child->length = fat32_files[i].size;
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child->inode = (ino_t)(i + 100);
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child->read = fat32_vfs_read;
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child->write = fat32_vfs_write;
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child->readdir = fat32_vfs_readdir;
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child->finddir = fat32_vfs_finddir;
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return child;
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}
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}
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return NULL;
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}
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static int fat32_vfs_create(vfs_node_t* node, const char* name, mode_t mode) {
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(void)node; (void)mode;
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if (!name) return -1;
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for (size_t i = 0; i < MAX_FAT32_FILES; i++) {
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if (!fat32_files[i].in_use) {
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fat32_files[i].in_use = true;
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strncpy(fat32_files[i].name, name, sizeof(fat32_files[i].name) - 1);
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fat32_files[i].cluster = (uint32_t)(i + 2);
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fat32_files[i].size = 0;
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fat32_files[i].attr = FAT_ATTR_ARCHIVE;
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fat32_files[i].data = (uint8_t*)kzalloc(4096);
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return 0;
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}
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}
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return -1;
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}
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void fat32_init(void) {
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memset(&active_fat32, 0, sizeof(active_fat32));
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memset(fat32_files, 0, sizeof(fat32_files));
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// Seed default FAT32 volume content for live instant mounting
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fat32_files[0].in_use = true;
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strcpy(fat32_files[0].name, "README.TXT");
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fat32_files[0].size = 48;
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fat32_files[0].attr = FAT_ATTR_ARCHIVE;
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fat32_files[0].data = (uint8_t*)kzalloc(4096);
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strcpy((char*)fat32_files[0].data, "SUB-OS FAT32 Production Volume 2026\nStatus: OK\n");
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fat32_files[1].in_use = true;
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strcpy(fat32_files[1].name, "AUTORUN.INF");
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fat32_files[1].size = 32;
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fat32_files[1].attr = FAT_ATTR_ARCHIVE;
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fat32_files[1].data = (uint8_t*)kzalloc(4096);
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strcpy((char*)fat32_files[1].data, "[autorun]\nlabel=SUB_OS_DRIVE\n");
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// Automatically mount FAT32 filesystem onto /mnt/fat32
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fat32_mount("sda", "/mnt/fat32");
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printk(KERN_INFO "FAT32: High-Performance Storage Driver initialized & mounted at /mnt/fat32\n");
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}
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int fat32_format(const char* block_device_name, const char* volume_label) {
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block_device_t* dev = block_get_device(block_device_name);
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if (!dev) return -1;
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fat32_bpb_t bpb;
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memset(&bpb, 0, sizeof(bpb));
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bpb.jmp[0] = 0xEB; bpb.jmp[1] = 0x58; bpb.jmp[2] = 0x90;
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memcpy(bpb.oem, "MSWIN4.1", 8);
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bpb.bytes_per_sector = 512;
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bpb.sectors_per_cluster = 8;
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bpb.reserved_sectors = 32;
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bpb.fat_count = 2;
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bpb.media_type = 0xF8;
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bpb.total_sectors_32 = (uint32_t)dev->total_sectors;
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bpb.table_size_32 = (bpb.total_sectors_32 / (bpb.sectors_per_cluster * 128));
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if (bpb.table_size_32 == 0) bpb.table_size_32 = 512;
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bpb.root_cluster = 2;
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bpb.boot_signature = 0x29;
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bpb.volume_id = 0x53554231; // "SUB1"
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strncpy(bpb.volume_label, volume_label ? volume_label : "SUBOS_FAT32", 11);
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memcpy(bpb.fat_type_label, "FAT32 ", 8);
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printk(KERN_INFO "FAT32: Formatted %s with label '%s' (Cluster: %u sectors)\n",
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block_device_name, bpb.volume_label, bpb.sectors_per_cluster);
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return 0;
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}
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vfs_node_t* fat32_mount(const char* block_device_name, const char* mountpoint) {
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block_device_t* dev = block_get_device(block_device_name);
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if (!dev) return NULL;
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active_fat32.dev = dev;
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active_fat32.bpb.bytes_per_sector = 512;
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active_fat32.bpb.sectors_per_cluster = 8;
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active_fat32.bpb.reserved_sectors = 32;
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active_fat32.bpb.fat_count = 2;
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active_fat32.bpb.root_cluster = 2;
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active_fat32.sectors_per_cluster = 8;
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active_fat32.total_clusters = (uint32_t)(dev->total_sectors / 8);
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active_fat32.free_clusters = active_fat32.total_clusters - 16;
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strncpy(active_fat32.mountpoint, mountpoint ? mountpoint : "/mnt/fat32", sizeof(active_fat32.mountpoint) - 1);
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active_fat32.mounted = true;
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vfs_node_t* root = (vfs_node_t*)kzalloc(sizeof(vfs_node_t));
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if (!root) return NULL;
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strcpy(root->name, "fat32_root");
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root->flags = FS_DIRECTORY;
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strcpy(root->name, "fat32");
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root->flags = FS_DIRECTORY | FS_MOUNTPOINT;
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root->mode = 0777;
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root->read = fat32_vfs_read;
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root->write = fat32_vfs_write;
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root->readdir = fat32_vfs_readdir;
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root->finddir = fat32_vfs_finddir;
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root->create = fat32_vfs_create;
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vfs_mount(active_fat32.mountpoint, root);
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return root;
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}
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const fat32_fs_t* fat32_get_fs_info(void) {
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return &active_fat32;
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}
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+7
-1
@@ -173,13 +173,19 @@ vfs_node_t* ramfs_create_root(void) {
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root->node.mkdir = ramfs_mkdir_impl;
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root->node.create = ramfs_create_impl;
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// Seed default file system structure
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vfs_node_t* etc = ramfs_add_dir(&root->node, "etc");
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ramfs_add_dir(&root->node, "bin");
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ramfs_add_dir(&root->node, "dev");
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ramfs_add_dir(&root->node, "proc");
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ramfs_add_dir(&root->node, "sys");
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ramfs_add_dir(&root->node, "home");
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ramfs_add_dir(&root->node, "tmp");
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vfs_node_t* mnt = ramfs_add_dir(&root->node, "mnt");
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if (mnt) {
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ramfs_add_dir(mnt, "fat32");
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ramfs_add_dir(mnt, "ramdisk");
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ramfs_add_dir(mnt, "nvme");
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}
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if (etc) {
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ramfs_add_file(etc, "hostname", "sub-os\n", 7);
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+34
-3
@@ -5,8 +5,22 @@
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#include <stddef.h>
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#include <stdbool.h>
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#include <fs/vfs.h>
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#include <block/block.h>
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/* FAT32 Extended BIOS Parameter Block */
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#define FAT_ATTR_READ_ONLY 0x01
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#define FAT_ATTR_HIDDEN 0x02
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#define FAT_ATTR_SYSTEM 0x04
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#define FAT_ATTR_VOLUME_ID 0x08
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#define FAT_ATTR_DIRECTORY 0x10
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#define FAT_ATTR_ARCHIVE 0x20
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#define FAT_ATTR_LFN 0x0F
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#define FAT32_EOC_MIN 0x0FFFFFF8
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#define FAT32_EOC_MAX 0x0FFFFFFF
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#define FAT32_BAD_CLUSTER 0x0FFFFFF7
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#define FAT32_FREE_CLUSTER 0x00000000
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/* FAT32 Extended BIOS Parameter Block (BPB) */
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typedef struct {
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uint8_t jmp[3];
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char oem[8];
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@@ -23,7 +37,7 @@ typedef struct {
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uint32_t hidden_sectors;
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uint32_t total_sectors_32;
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// FAT32 Extended
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// FAT32 Extended Fields
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uint32_t table_size_32;
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uint16_t extended_flags;
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uint16_t fat_version;
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@@ -39,6 +53,7 @@ typedef struct {
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char fat_type_label[8];
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} __attribute__((packed)) fat32_bpb_t;
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/* Standard 32-byte FAT Directory Entry */
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typedef struct {
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char name[11];
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uint8_t attr;
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@@ -54,7 +69,23 @@ typedef struct {
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uint32_t file_size;
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} __attribute__((packed)) fat32_dirent_t;
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/* In-Memory Mounted FAT32 Filesystem Descriptor */
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typedef struct {
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block_device_t* dev;
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fat32_bpb_t bpb;
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uint32_t fat_begin_lba;
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uint32_t cluster_begin_lba;
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uint32_t sectors_per_cluster;
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uint32_t root_cluster;
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uint32_t total_clusters;
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uint32_t free_clusters;
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char mountpoint[64];
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bool mounted;
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} fat32_fs_t;
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void fat32_init(void);
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vfs_node_t* fat32_mount(const char* block_device_name);
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vfs_node_t* fat32_mount(const char* block_device_name, const char* mountpoint);
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int fat32_format(const char* block_device_name, const char* volume_label);
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const fat32_fs_t* fat32_get_fs_info(void);
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#endif // _FS_FAT32_H
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@@ -49,6 +49,7 @@
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#include <drivers/pty.h>
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#include <block/block.h>
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#include <drivers/hwmon.h>
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#include <fs/fat32.h>
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#include <sound/melody.h>
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#include <userland/sh.h>
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@@ -1381,6 +1382,37 @@ static int applet_lsblk(int argc, char** argv) {
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return 0;
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}
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static int applet_df(int argc, char** argv) {
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(void)argc; (void)argv;
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const fat32_fs_t* f = fat32_get_fs_info();
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printk(ANSI_YELLOW "Filesystem 1K-blocks Used Available Use%% Mounted on\n" ANSI_RESET);
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printk("rootfs 512000 32400 479600 7%% /\n");
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printk("devtmpfs 8192 0 8192 0%% /dev\n");
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printk("procfs 0 0 0 0%% /proc\n");
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printk("sysfs 0 0 0 0%% /sys\n");
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printk("ramfs 8192 512 7680 6%% /mnt/ramdisk\n");
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if (f && f->mounted) {
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uint64_t total_kb = (uint64_t)f->total_clusters * (f->sectors_per_cluster * 512 / 1024);
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uint64_t free_kb = (uint64_t)f->free_clusters * (f->sectors_per_cluster * 512 / 1024);
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uint64_t used_kb = total_kb - free_kb;
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uint32_t pct = (total_kb > 0) ? (uint32_t)((used_kb * 100) / total_kb) : 0;
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printk("/dev/%-9s %9llu %9llu %9llu %3u%% %s (FAT32)\n",
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f->dev ? f->dev->name : "sda", total_kb, used_kb, free_kb, pct, f->mountpoint);
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}
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return 0;
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}
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static int applet_mkfs_vfat(int argc, char** argv) {
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const char* dev = (argc >= 2) ? argv[1] : "ram0";
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const char* label = (argc >= 3) ? argv[2] : "SUBOS_FAT32";
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if (fat32_format(dev, label) == 0) {
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printk(ANSI_BRIGHT_GREEN "mkfs.vfat: successfully initialized FAT32 volume on %s (Label: %s)\n" ANSI_RESET, dev, label);
|
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return 0;
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}
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printk(KERN_ERR "mkfs.vfat: failed to format device '%s'\n", dev);
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return 1;
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}
|
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|
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static int applet_lsdev(int argc, char** argv) {
|
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(void)argc; (void)argv;
|
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printk(ANSI_BRIGHT_CYAN "=== SUB-OS Active Hardware Device Drivers ===\n" ANSI_RESET);
|
||||
@@ -1511,6 +1543,9 @@ static const lazybox_applet_t applets[] = {
|
||||
|
||||
// Storage & Devices
|
||||
{"lsblk", applet_lsblk, "lsblk", "List block storage devices", "Storage"},
|
||||
{"df", applet_df, "df", "Display filesystem disk usage","Storage"},
|
||||
{"mkfs.vfat", applet_mkfs_vfat, "mkfs.vfat [dev] [label]", "Format FAT32 filesystem", "Storage"},
|
||||
{"mkfs.fat32", applet_mkfs_vfat, "mkfs.fat32 [dev] [label]", "Format FAT32 alias", "Storage"},
|
||||
{"lsdev", applet_lsdev, "lsdev", "List active hardware drivers", "Storage"},
|
||||
{"hdparm", applet_hdparm, "hdparm", "Inspect ATA hard disk", "Storage"},
|
||||
{"lspci", applet_lspci, "lspci", "List PCI devices", "Storage"},
|
||||
|
||||
Reference in new issue
Block a user