Meta: Move kernel and userland to their own folders.

This is to allow both the kernel and the userland to share certain
header files and to make the folder structure a bit more clear.

1 files changed, 140 insertions, 0 deletions

diff --git a/kernel/fs/ext2.h b/kernel/fs/ext2.h
new file mode 100644
index 0000000..3a2f800
--- /dev/null
+++ b/kernel/fs/ext2.h
@@ -0,0 +1,140 @@
+#ifndef EXT2_H
+#define EXT2_H
+#include <drivers/ata.h>
+#include <fs/vfs.h>
+#include <kmalloc.h>
+#include <stdint.h>
+
+typedef struct Superblock {
+  uint32_t num_inodes;
+  uint32_t num_blocks;
+  uint32_t num_blocks_reserved;
+  uint32_t num_blocks_unallocated;
+  uint32_t num_inodes_unallocated;
+  uint32_t superblock_block_num;
+  uint32_t block_size;
+  uint32_t fragment_size;
+  uint32_t num_blocks_in_group;
+  uint32_t num_fragments_in_group;
+  uint32_t num_inodes_in_group;
+  uint32_t last_mount;
+  uint32_t last_write;
+  uint16_t num_mounts_since_fsck;
+  uint16_t num_mounts_allowed;
+  uint16_t ext2_signature; // 0xEF53
+  uint16_t fs_state;
+  uint16_t when_error;
+  uint16_t minor_version;
+  uint32_t last_fsck;
+  uint32_t interval_fsck;
+  uint32_t os_id;
+  uint32_t major_version;
+  uint16_t userid_reserved_blocks;
+  uint16_t groupid_reserved_blocks;
+} __attribute__((packed)) superblock_t;
+
+typedef struct ExtendedSuperblock {
+  uint32_t num_inodes;
+  uint32_t num_blocks;
+  uint32_t num_blocks_reserved;
+  uint32_t num_blocks_unallocated;
+  uint32_t num_inodes_unallocated;
+  uint32_t superblock_block_num;
+  uint32_t block_size;
+  uint32_t fragment_size;
+  uint32_t num_blocks_group;
+  uint32_t num_fragments_group;
+  uint32_t num_inodes_group;
+  uint32_t last_mount;
+  uint32_t last_write;
+  uint16_t num_mounts_since_fsck;
+  uint16_t num_mounts_allowed;
+  uint16_t ext2_signature; // 0xEF53
+  uint16_t fs_state;
+  uint16_t when_error;
+  uint16_t minor_version;
+  uint32_t last_fsck;
+  uint32_t interval_fsck;
+  uint32_t os_id;
+  uint32_t major_version;
+  uint16_t userid_reserved_blocks;
+  uint16_t groupid_reserved_blocks;
+  uint32_t pad;
+  uint16_t inode_size;
+} __attribute__((packed)) ext_superblock_t;
+
+typedef struct BlockGroupDescriptorTable {
+  uint32_t block_usage_bitmap;
+  uint32_t inode_usage_bitmap;
+  uint32_t starting_inode_table;
+  uint16_t num_unallocated_blocks_in_group;
+  uint16_t num_unallocated_inodes_in_group;
+  uint16_t num_directories_group;
+} __attribute__((packed)) bgdt_t;
+
+typedef struct INode {
+  uint16_t types_permissions;
+  uint16_t user_id;
+  uint32_t low_32size;
+  uint32_t last_access_time;
+  uint32_t creation_time;
+  uint32_t last_modification_time;
+  uint32_t deletion_time;
+  uint16_t group_id;
+  uint16_t num_hard_links;
+  uint32_t num_disk_sectors;
+  uint32_t flags;
+  uint32_t os_specific;
+  uint32_t block_pointers[12];
+  uint32_t single_indirect_block_pointer;
+  uint32_t double_indirect_block_pointer;
+  uint32_t triple_indirect_block_pointer;
+  uint32_t gen_number;
+  uint32_t _extended_attribute_block;
+  uint32_t _upper_32size;
+  uint32_t address_fragment;
+  uint32_t os_specific2;
+} __attribute__((packed)) inode_t;
+
+// 0    Unknown type
+// 1    Regular file
+// 2    Directory
+// 3    Character device
+// 4    Block device
+// 5    FIFO
+// 6    Socket
+// 7    Symbolic link (soft link)
+#define TYPE_INDICATOR_UNKOWN 0
+#define TYPE_INDICATOR_REGULAR 1
+#define TYPE_INDICATOR_DIRECTORY 2
+#define TYPE_INDICATOR_CHARACTER_DEVICE 3
+#define TYPE_INDICATOR_BLOCK_DEVICE 4
+#define TYPE_INDICATOR_FIFO 5
+#define TYPE_INDICATOR_SOCKET 6
+#define TYPE_INDICATOR_SOFT_LINK 7
+
+#define FIFO 0x1000
+#define CHARACTER_DEVICE 0x2000
+#define DIRECTORY 0x4000
+#define BLOCK_DEVICE 0x6000
+#define REGULAR_FILE 0x8000
+#define SYMBOLIC_LINK 0xA000
+#define UNIX_SOCKET 0xC000
+
+typedef struct DirectoryEntryHeader {
+  uint32_t inode;
+  uint16_t size;
+  uint8_t name_length;
+  uint8_t type_indicator;
+} __attribute__((packed)) direntry_header_t;
+
+int ext2_create_file(const char *path, int mode);
+vfs_inode_t *ext2_mount(void);
+void parse_superblock(void);
+size_t ext2_read_file_offset(const char *file, unsigned char *data,
+                             uint64_t size, uint64_t offset,
+                             uint64_t *file_size);
+size_t ext2_read_file(const char *file, unsigned char *data, size_t size,
+                      uint64_t *file_size);
+int ext2_create_directory(const char *path, int mode);
+#endif