loading initrd now...

initrd/make_img.sh

@@ -0,0 +1,5 @@
+#!/bin/bash 
+
+mkdir -p output
+rm -rf output/*
+find . -depth -print | cpio -o -H newc > output/initrd.img

kernel/drivers/cpio/cpio.c

@@ -0,0 +1,92 @@
+#include <drivers/cpio/cpio.h>
+
+#include <lib/memory.h>
+
+#define MAX_INITRD_FILES 64
+static vfs_node_t cpio_nodes[MAX_INITRD_FILES];
+static uint32_t cpio_node_count = 0;
+
+static uint32_t parse_hex_ascii(const char *str, int len) {
+    uint32_t result = 0;
+    for (int i = 0; i < len; i++) {
+        result <<= 4;
+        if (str[i] >= '0' && str[i] <= '9')      result |= (str[i] - '0');
+        else if (str[i] >= 'A' && str[i] <= 'F') result |= (str[i] - 'A' + 10);
+        else if (str[i] >= 'a' && str[i] <= 'f') result |= (str[i] - 'a' + 10);
+    }
+    return result;
+}
+
+static vfs_node_t* cpio_find(vfs_node_t* _dir, const char* name) {
+    if (!(_dir->flags & VFS_DIRECTORY)) return NULL;
+
+    for (uint32_t i = 0; i < cpio_node_count; i++) {
+        if (strcmp(cpio_nodes[i].name, name) == 0) {
+            return &cpio_nodes[i];
+        }
+    }
+    
+    return NULL; // File not found
+}
+
+static uint32_t cpio_read(struct vfs_node* node, uint32_t offset, uint32_t size, uint8_t* buffer) {
+    if (offset >= node->size) return 0;
+    if (offset + size > node->size) {
+        size = node->size - offset;
+    }
+    memcpy(buffer, (uint8_t*)(node->ptr) + offset, size);
+    return size;
+}
+
+vfs_node_t* cpio_read_fs(uint32_t _vaddr) {
+    cpio_header_t* header = (cpio_header_t*)_vaddr;
+
+    vfs_node_t* cpio_root = kalloc(sizeof(vfs_node_t));
+    memset((uint8_t*)cpio_root, 0, sizeof(vfs_node_t));
+
+    strcpy(cpio_root->name, "cpio_root");
+
+    cpio_root->flags |= VFS_DIRECTORY;
+    cpio_root->finddir = cpio_find;
+
+    uint32_t cnt = 0;
+    while (1) {
+        if (strncmp(header->c_magic, "070701", 6) != 0 && 
+            strncmp(header->c_magic, "070702", 6) != 0) {
+            break;
+        }
+
+        uint32_t namesize = parse_hex_ascii(header->c_namesize, 8);
+        uint32_t filesize = parse_hex_ascii(header->c_filesize, 8);
+        uint32_t mode     = parse_hex_ascii(header->c_mode, 8);
+
+        char* filename = (char*)header + sizeof(cpio_header_t);
+
+        if (strcmp(filename, "TRAILER!!!") == 0) {
+            break;
+        }
+
+        uint32_t file_data_offset = sizeof(cpio_header_t) + namesize;
+        file_data_offset = (file_data_offset + 3) & ~3; // align to 4 bytes
+
+        uint8_t* file_data = (uint8_t*)header + file_data_offset;
+
+        if (strcmp(".", filename) != 0 && cnt < MAX_INITRD_FILES) {
+            vfs_node_t* current = &cpio_nodes[cpio_node_count++];
+            memset((uint8_t*)current, 0, sizeof(vfs_node_t));
+
+            strcpy(current->name, filename);
+            current->size = filesize;
+
+            current->flags = VFS_FILE;
+            current->read = cpio_read;
+            current->ptr = (vfs_node_t*)file_data;
+        }
+
+        uint32_t next_header_offset = file_data_offset + filesize;
+        next_header_offset = (next_header_offset + 3) & ~3;
+        header = (cpio_header_t*)((uint8_t*)header + next_header_offset);
+    }
+
+    return cpio_root;
+}

kernel/drivers/cpio/cpio.h

@@ -0,0 +1,25 @@
+#ifndef D_CPIO_H
+#define D_CPIO_H
+
+#include <vfs.h>
+
+typedef struct {
+    char c_magic[6];     // "070701" or "070702"
+    char c_ino[8];
+    char c_mode[8];      // File type & permissions
+    char c_uid[8];
+    char c_gid[8];
+    char c_nlink[8];
+    char c_mtime[8];
+    char c_filesize[8];  // File size in hex ASCII
+    char c_devmajor[8];
+    char c_devminor[8];
+    char c_rdevmajor[8];
+    char c_rdevminor[8];
+    char c_namesize[8];  // Length of filename in hex ASCII
+    char c_check[8];
+} __attribute__((packed)) cpio_header_t;
+
+vfs_node_t* cpio_read_fs(uint32_t _vaddr);
+
+#endif

kernel/kmain.c

@@ -3,7 +3,7 @@
 #include "gdt.h"
 #include "scheduler.h"
 #include "common.h"
-#include "initrd.h"
+#include "vfs.h"
 
 #include <lib/print.h>
 #include <lib/stream.h>
@@ -17,6 +17,7 @@
 #include <drivers/ps2/ps2.h>
 #include <drivers/pit/pit.h>
 #include <drivers/vga/vga.h>
+#include <drivers/cpio/cpio.h>
 
 #include <stddef.h>
 #include <stdint.h>
@@ -44,12 +45,32 @@ void parse_multiboot_modules(uint32_t mbi_vaddr) {
   }
 }
 
-void load_initrd() {
+vfs_node_t* load_initrd() {
   multiboot_module_t* initrd_module = &multiboot_module_info_table[0];
   kprintf("initrd found @ [v] 0x%x\n", initrd_module->mod_start);
-  kprintf("reading initrd\n");
+  return cpio_read_fs(initrd_module->mod_start);
+}
 
-  parse_cpio((void*)initrd_module->mod_start);
+void load_origin_program() {
+  vfs_node_t* vfs_root = vfs_create_root();
+  vfs_node_t* initrd_root = load_initrd();
+  
+  if (initrd_root) {
+    mount(vfs_root, initrd_root);
+    kprintf("initrd read, mounted @ /\n");
+
+    int fd = open("/origin.elf", 0);
+    if (fd == -1) {
+      kprintf("failed to read origin program\n");
+    }
+
+    void* buf = kalloc(512);
+    int rd = read(fd, buf, 512);
+    if (rd > 0) {
+      kprintf("read %d bytes from origin.elf\n", rd);
+    }
+  }
+  exit();
 }
 
 void kmain(uint32_t magic, multiboot_info* mbi)  {
@@ -72,12 +93,12 @@ void kmain(uint32_t magic, multiboot_info* mbi)  {
   init_page_tables();
 
   parse_multiboot_modules((uint32_t)mbi);
-
-  load_initrd();
-
+  
   kprintf("basic initializations complete\n");
 
-  disable_interrupts(); // just paranoid... do it again
+  disable_interrupts();
   init_scheduler();
   enable_interrupts();
+
+  create_task((uint32_t)load_origin_program, fetch_cr3());
 }

kernel/lib/memory.c

@@ -58,6 +58,14 @@ int strncmp(const char *s1, const char *s2, size_t n) {
     return 0;
 }
 
+char* strcpy(char* dest, const char* src) {
+    char* saved_dest = dest;
+
+    while ((*dest++ = *src++) != '\0') {}
+
+    return saved_dest;
+}
+
 static void* kernel_heap_start = (void*)KHEAP_START;
 static void* kernel_heap_end = (void*)KHEAP_START;
 alloc_header_t* blk_list = NULL;

kernel/lib/memory.h

@@ -10,6 +10,7 @@ void memset(const uint8_t* dst, uint8_t val, size_t sz);
 int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, size_t n);
 int strlen(const char* str);
+char* strcpy(char* dest, const char* src);
 
 void kgrow(size_t pages);
 void* kalloc(size_t sz);

kernel/vfs.c

@@ -1,12 +1,77 @@
 #include "vfs.h"
+
 #include "lib/memory.h"
-#include <string.h>
+
+#define MAX_PROCESS_FDS 32
+file_t fd_table[MAX_PROCESS_FDS];
 
 vfs_node_t* root = NULL;
 
-void vfs_create_root() {
+vfs_node_t* vfs_create_root() {
     root = kalloc(sizeof(vfs_node_t));
-    memset((uint8_t*)root->name, 0, 128);
-    memcpy("root", root->name, 4);
+    memset((uint8_t*)root, 0, sizeof(vfs_node_t));
+
+    strcpy(root->name, "root");
+
     root->flags |= VFS_DIRECTORY;
+    root->size = 0;
+    root->finddir = NULL;
+
+    return root;
+}
+
+void mount(vfs_node_t* _mnt, vfs_node_t* _fs) {
+    if (!_fs || !_mnt || !(_mnt->flags & VFS_DIRECTORY)) return;
+    _mnt->ptr = _fs;
+}
+
+static vfs_node_t* lookup(const char* path) {
+    if (path[0] != '/') return NULL;
+    vfs_node_t* current = root;
+
+    if (current->ptr) {
+        current = current->ptr;
+    }
+
+    const char* component = path + 1;
+    if (*component == '\0') return current;
+
+    if (current->finddir) {
+        return current->finddir(current, component);
+    }
+
+    return NULL;
+}
+
+int open(const char* _path, int flags) {
+    vfs_node_t* file = lookup(_path);
+    if (!file) return -1;
+    for (int i = 0; i < MAX_PROCESS_FDS; i++) {
+        if (fd_table[i].node == NULL) {
+            fd_table[i].node = file;
+            fd_table[i].offset = 0;
+            fd_table[i].flags = flags;
+            return i;
+        }
+    }
+    return -1;
+}
+
+int read(int fd, void* buf, size_t sz) {
+    if (fd < 0 || fd >= MAX_PROCESS_FDS || !fd_table[fd].node) {
+        return -1;
+    }
+
+    file_t* file = &fd_table[fd];
+
+    if (!file->node->read) return -1;
+
+    uint32_t bytes_read = file->node->read(file->node, file->offset, sz, buf);
+    file->offset += bytes_read;
+
+    return bytes_read;
+}
+
+int fseek(int fd) {
+    
 }

kernel/vfs.h

@@ -2,9 +2,13 @@
 #define KVFS_H
 
 #include <stdint.h>
+#include <stddef.h>
 
-#define VFS_FILE      0x01
-#define VFS_DIRECTORY 0x02
+#define VFS_FILE        0x01
+#define VFS_DIRECTORY   0x02
+#define VFS_CHARDEVICE  0x03
+#define VFS_BLOCKDEVICE 0x04
+#define VFS_PIPE        0x05
 
 struct vfs_node;
 
@@ -16,15 +20,24 @@ typedef struct vfs_node {
     char name[128];
     uint32_t flags;       // File, directory, device, etc.
     uint32_t size;        // Size of file in bytes
-    uint32_t inode;       // Unique identifier managed by the specific filesystem
     
     read_type_t read;
     write_type_t write;
     finddir_type_t finddir; 
 
-    struct vfs_node* mount;
+    struct vfs_node* ptr;
 } vfs_node_t;
 
-void vfs_create_root();
+typedef struct {
+    vfs_node_t* node;   // The actual CPIO/VFS node
+    uint32_t offset;    // Current read/write cursor position
+    uint32_t flags;     // Permissions (O_RDONLY, etc.)
+} file_t;
+
+vfs_node_t* vfs_create_root();
+
+void mount(vfs_node_t* _mnt, vfs_node_t* _fs);
+int open(const char* path, int flags);
+int read(int fd, void* buf, size_t sz);
 
 #endif