vfs - start making the VFS

kernel/src/fs/vfs.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct vnode;
+
+#define VN_FILE 1
+#define VN_DIR  2
+
+typedef uint32_t vnode_type_t;
+
+typedef struct vnode_ops {
+    int (*read)(struct vnode* vn, void* buf, size_t size);
+} vnode_ops_t;
+
+typedef struct vnode {
+    char name[256];
+    vnode_type_t type;
+    struct vnode* parent;
+    struct vnode* child;
+    struct vnode* next;
+
+    struct vnode_ops* ops;
+    void* internal;
+} vnode_t;
+
+typedef struct fs {
+    char name[32];
+    int (*mount)(struct vnode** root);
+} fs_t;
+
+void vfs_init(void);
+int vfs_mount(char *path, fs_t* fs);
+int vfs_unmount(char *path);
+int vfs_open(const char* path, vnode_t** result);
+int vfs_read(vnode_t* vn, void* buf, size_t size);

kernel/src/lib/string.c

@@ -1,4 +1,5 @@
 #include <lib/string.h>
+#include <mm/liballoc/liballoc.h>
 #include <stddef.h>
 
 int strlen(const char *str) {
@@ -16,14 +17,14 @@ int strcmp(const char *s1, const char *s2) {
   return *s1 - *s2;
 }
 
-char *strcpy(char *dest, const char *src)
-{
-    if (dest == NULL || src == NULL)
-        return NULL;
-    
-    char *temp = dest;
-    while((*dest++ = *src++) != '\0'); 
-    return temp;
+char *strcpy(char *dest, const char *src) {
+  if (dest == NULL || src == NULL)
+    return NULL;
+
+  char *temp = dest;
+  while ((*dest++ = *src++) != '\0')
+    ;
+  return temp;
 }
 
 char *strchr(const char *s, int c) {
@@ -35,23 +36,36 @@ char *strchr(const char *s, int c) {
 }
 
 char *strrchr(const char *s, int c) {
-    const char *p = NULL;
+  const char *p = NULL;
 
-    for (;;) {
-        if (*s == (char)c)
-            p = s;
-        if (*s++ == '\0')
-            return (char *)p;
-    }
+  for (;;) {
+    if (*s == (char)c)
+      p = s;
+    if (*s++ == '\0')
+      return (char *)p;
+  }
 }
 
 int oct2bin(unsigned char *str, int size) {
-    int n = 0;
-    unsigned char *c = str;
-    while (size-- > 0) {
-        n *= 8;
-        n += *c - '0';
-        c++;
-    }
-    return n;
+  int n = 0;
+  unsigned char *c = str;
+  while (size-- > 0) {
+    n *= 8;
+    n += *c - '0';
+    c++;
+  }
+  return n;
+}
+
+char *strdup(const char *str) {
+  if (str == NULL)
+    return NULL;
+
+  int len = strlen(str);
+  char *dup = (char *)malloc(len + 1);
+  if (dup == NULL)
+    return NULL;
+
+  strcpy(dup, str);
+  return dup;
 }

kernel/src/lib/string.h

@@ -5,4 +5,5 @@ int strcmp(const char *s1, const char *s2);
 char *strchr(const char *s, int c);
 char *strcpy(char *dest, const char *src);
 char *strrchr(const char *s, int c);
-int oct2bin(unsigned char *str, int size);
+int oct2bin(unsigned char *str, int size);
+char *strdup(const char *str);

kernel/src/main.c

@@ -18,11 +18,13 @@
 #include <sys/arch/x86_64/fpu.h>
 #include <sys/arch/x86_64/gdt.h>
 #include <sys/arch/x86_64/idt.h>
-#include <sys/error_handling/panic.h>
+#include <sys/errhnd/panic.h>
 #include <sys/gfx/flanterm/backends/fb.h>
 #include <sys/gfx/flanterm/flanterm.h>
 #include <sys/log.h>
 #include <sys/printf.h>
+#include <fs/vfs.h>
+#include <fs/hellofs.h>
 
 __attribute__((
     used, section(".limine_requests"))) static volatile LIMINE_BASE_REVISION(3);
@@ -84,12 +86,22 @@ void kmain(void) {
     while (1)
       asm("hlt");
   }
-
+  
   syscall_init();
   pit_init(1000);
   sched_init();
+  
+  vfs_init();
+  if (hellofs_init() < 0) {
+    log("kernel - Failed to initialize HelloFS\n");
+  } else {
+    log("kernel - HelloFS initialized successfully\n");
+  }
 
-  panic("No working initialization program found. (This is normal due to Soaplin's current state, so please do not report this as a bug)");
+  
+
+  panic("No working initialization program found. (This is normal due to "
+        "Soaplin's current state, so please do not report this as a bug)");
 
   log("kernel - Soaplin initialized sucessfully.\n");
 

kernel/src/sys/arch/x86_64/rtc.c

@@ -4,38 +4,40 @@
 char bcd;
 
 unsigned char read_register(unsigned char reg) {
-    __asm__ volatile("cli");
-    outb(RTC_COMMAND, reg);
-    return inb(RTC_DATA);
-    __asm__ volatile("sti");
+  __asm__ volatile("cli");
+  outb(RTC_COMMAND, reg);
+  return inb(RTC_DATA);
+  __asm__ volatile("sti");
 }
 
 void write_register(unsigned char reg, unsigned char value) {
-    __asm__ volatile("cli");
-    outb(RTC_COMMAND, reg);
-    outb(RTC_DATA, value);
-    __asm__ volatile("sti");
+  __asm__ volatile("cli");
+  outb(RTC_COMMAND, reg);
+  outb(RTC_DATA, value);
+  __asm__ volatile("sti");
 }
 
 unsigned char bcd2bin(unsigned char in_bcd) {
-    return (bcd) ? ((in_bcd >> 4) * 10) + (in_bcd & 0x0F) : in_bcd;
+  return (bcd) ? ((in_bcd >> 4) * 10) + (in_bcd & 0x0F) : in_bcd;
 }
 
 int rtc_init() {
-    __asm__ volatile("cli");
-    unsigned char status;
-    status = read_register(RTC_STATUS);
-    status |= 0x02;         // 24 hour clock
-    status |= 0x10;         // update ended interrupts
-    status &= ~0x20;        // no alarm interrupts
-    status &= ~0x40;        // no periodic interrupt
-    bcd = !(status & 0x04); // check if data type is BCD
-    write_register(RTC_STATUS, status);
+  __asm__ volatile("cli");
+  unsigned char status;
+  status = read_register(RTC_STATUS);
+  status |= 0x02;         // 24 hour clock
+  status |= 0x10;         // update ended interrupts
+  status &= ~0x20;        // no alarm interrupts
+  status &= ~0x40;        // no periodic interrupt
+  bcd = !(status & 0x04); // check if data type is BCD
+  write_register(RTC_STATUS, status);
 
-    outb(0x70, 0x8B);		// select register B, and disable NMI
-    char prev=inb(0x71);	// read the current value of register B
-    outb(0x70, 0x8B);		// set the index again (a read will reset the index to register D)
-    outb(0x71, prev | 0x40);	// write the previous value ORed with 0x40. This turns on bit 6 of register B
-    __asm__ volatile("sti");
-    return 0;
+  outb(0x70, 0x8B);      // select register B, and disable NMI
+  char prev = inb(0x71); // read the current value of register B
+  outb(0x70,
+       0x8B); // set the index again (a read will reset the index to register D)
+  outb(0x71, prev | 0x40); // write the previous value ORed with 0x40. This
+                           // turns on bit 6 of register B
+  __asm__ volatile("sti");
+  return 0;
 }

kernel/src/sys/arch/x86_64/rtc.h

@@ -1,17 +1,17 @@
 #ifndef __TIME_H
 #define __TIME_H
 
-#define RTC_COMMAND         0x70
-#define RTC_DATA            0x71
-#define RTC_STATUS          0x0B
+#define RTC_COMMAND 0x70
+#define RTC_DATA 0x71
+#define RTC_STATUS 0x0B
 
-#define RTC_SECONDS         0x00
-#define RTC_MINUTES         0x02
-#define RTC_HOURS           0x04
-#define RTC_DAY_OF_WEEK     0x06
-#define RTC_DAY             0x07
-#define RTC_MONTH           0x08
-#define RTC_YEAR            0x09
+#define RTC_SECONDS 0x00
+#define RTC_MINUTES 0x02
+#define RTC_HOURS 0x04
+#define RTC_DAY_OF_WEEK 0x06
+#define RTC_DAY 0x07
+#define RTC_MONTH 0x08
+#define RTC_YEAR 0x09
 
 int rtc_init();
 

kernel/src/sys/errhnd/panic.c

@@ -65,10 +65,9 @@ void __panic_display_ascii_art() {
       "halt the PC.\n");
 }
 
-
 void panic(char *msg) {
   __panic_display_ascii_art();
-  
+
   log("\n");
   log("%s\n", msg);
   log("\n");