From 18f73a53573ab867c9e9875e7b1e99a006356c91 Mon Sep 17 00:00:00 2001
From: Arnau478 <arnauxabia@gmail.com>
Date: Sat, 2 Jul 2022 16:37:02 +0200
Subject: [PATCH] Basic VFS implementation

---
 src/kernel/fs/fs.c | 46 ++++++++++++++++++++++++++++++++++++++++++
 src/kernel/fs/fs.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++
 src/kernel/main.c  |  1 -
 3 files changed, 96 insertions(+), 1 deletion(-)
 create mode 100644 src/kernel/fs/fs.c
 create mode 100644 src/kernel/fs/fs.h

diff --git a/src/kernel/fs/fs.c b/src/kernel/fs/fs.c
new file mode 100644
index 0000000..23d1748
--- /dev/null
+++ b/src/kernel/fs/fs.c
@@ -0,0 +1,46 @@
+#include <stddef.h>
+#include "fs.h"
+
+fs_node_t *fs_root = NULL;
+
+uint32_t fs_read(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer){
+    if(node->read != NULL){
+        return node->read(node, offset, size, buffer);
+    }
+    return 0;
+}
+
+uint32_t fs_write(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer){
+    if(node->write != NULL){
+        return node->write(node, offset, size, buffer);
+    }
+    return 0;
+}
+
+void fs_open(fs_node_t *node, uint8_t read, uint8_t write){
+    if(node->open != NULL){
+        return node->open(node);
+    }
+    return 0;
+}
+
+void fs_close(fs_node_t *node){
+    if(node->close != NULL){
+        return node->close(node);
+    }
+    return 0;
+}
+
+dirent_t *fs_readdir(fs_node_t *node, uint32_t index){
+    if(node->readdir != NULL && (node->flags & 0x7 == FS_DIRECTORY)){
+        return node->readdir(node, index);
+    }
+    return 0;
+}
+
+fs_node_t *fs_finddir(fs_node_t *node, char *name){
+    if(node->finddir != NULL && (node->flags & 0x7 == FS_DIRECTORY)){
+        return node->finddir(node, name);
+    }
+    return 0;
+}
diff --git a/src/kernel/fs/fs.h b/src/kernel/fs/fs.h
new file mode 100644
index 0000000..2cbf4e0
--- /dev/null
+++ b/src/kernel/fs/fs.h
@@ -0,0 +1,50 @@
+#pragma once
+
+#include <stdint.h>
+
+#define FS_FILE 0x01
+#define FS_DIRECTORY 0x02
+#define FS_CHARDEVICE 0x03
+#define FS_BLOCKDEVICE 0x04
+#define FS_PIPE 0x05
+#define FS_SYMLINK 0x06
+#define FS_MOUNTPOINT 0x08
+
+typedef struct fs_node{
+    char name[128];
+    uint32_t mask;
+    uint32_t uid;
+    uint32_t gid;
+    uint32_t flags;
+    uint32_t inode;
+    uint32_t length;
+    uint32_t impl;
+    fs_read_fn_t read;
+    fs_write_fn_t write;
+    fs_open_fn_t open;
+    fs_close_fn_t close;
+    fs_readdir_fn_t readdir;
+    fs_finddir_fn_t finddir;
+    struct fs_node *ptr;
+} fs_node_t;
+
+typedef struct dirent{
+    char name[128];
+    uint32_t inode;
+} dirent_t;
+
+typedef uint32_t (*fs_read_fn_t)(fs_node_t *, uint32_t, uint32_t, uint8_t *);
+typedef uint32_t (*fs_write_fn_t)(fs_node_t *, uint32_t, uint32_t, uint8_t *);
+typedef void (*fs_open_fn_t)(fs_node_t *);
+typedef void (*fs_close_fn_t)(fs_node_t *);
+typedef dirent_t *(*fs_readdir_fn_t)(fs_node_t *, uint32_t);
+typedef fs_node_t *(*fs_finddir_fn_t)(fs_node_t *, char *);
+
+extern fs_node_t *fs_root;
+
+uint32_t fs_read(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
+uint32_t fs_write(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
+void fs_open(fs_node_t *node, uint8_t read, uint8_t write);
+void fs_close(fs_node_t *node);
+dirent_t *fs_readdir(fs_node_t *node, uint32_t index);
+fs_node_t *fs_finddir(fs_node_t *node, char *name);
diff --git a/src/kernel/main.c b/src/kernel/main.c
index 3a974f8..b4f4258 100644
--- a/src/kernel/main.c
+++ b/src/kernel/main.c
@@ -11,6 +11,5 @@ void __attribute__((cdecl)) kmain(uint64_t magic, uint64_t addr){
     keyboard_initialize();
     
     clear_screen();
-    printf("Serial status: %i\n", serial_initialize(COM1));
     for(;;);
 }