From 6becbff5724d79cb3a958db297b5c3310200daea Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Thu, 23 Jul 2020 21:06:44 +0200
Subject: Added *very* simple ide and ext2 support

---
 src/inc/cpu.h |  1 +
 src/inc/fs.h  | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/inc/ide.h | 40 ++++++++++++++++++++++++
 3 files changed, 138 insertions(+)
 create mode 100644 src/inc/fs.h
 create mode 100644 src/inc/ide.h

(limited to 'src/inc')

diff --git a/src/inc/cpu.h b/src/inc/cpu.h
index ad83896..b8897de 100644
--- a/src/inc/cpu.h
+++ b/src/inc/cpu.h
@@ -8,6 +8,7 @@
 u8 inb(u16 port);
 u16 inw(u16 port);
 u32 inl(u16 port);
+void insl(u16 port, void *addr, int n);
 
 void outb(u16 port, u8 data);
 void outw(u16 port, u16 data);
diff --git a/src/inc/fs.h b/src/inc/fs.h
new file mode 100644
index 0000000..e5e1ca7
--- /dev/null
+++ b/src/inc/fs.h
@@ -0,0 +1,97 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+// EXT2 based filesystem
+
+#ifndef FS_H
+#define FS_H
+
+#include <def.h>
+
+#define EXT2_BOOT 0
+#define EXT2_SUPER 1
+#define EXT2_MAGIC 0x0000EF53
+
+struct superblock {
+	u32 total_inodes;
+	u32 total_blocks;
+	u32 su_res_blocks; // Superuser reserved
+	u32 free_blocks;
+	u32 free_inodes;
+	u32 superblock_block_num;
+	u32 log2_block_size;
+	u32 log2_frag_size;
+	u32 blocks_per_group;
+	u32 frags_per_group;
+	u32 inodes_per_group;
+	u32 last_mount_time;
+	u32 last_write_time;
+	u16 mounts_since_fsck;
+	u16 max_mounts_since_fsck;
+	u16 magic;
+	u16 state; // 1 clean; 2 errors
+	u16 error_action;
+	u16 minor_version;
+	u32 last_fsck_time;
+	u32 max_time_since_fsck;
+	u32 creator_os_id;
+	u32 major_version;
+	u16 res_block_uid;
+	u16 res_block_gid;
+};
+
+struct bgd {
+	u32 block_bitmap;
+	u32 inode_bitmap;
+	u32 inode_table;
+	u16 free_blocks;
+	u16 free_inodes;
+	u16 used_dirs;
+	u16 pad;
+	u8 bg_reserved[12];
+};
+
+struct inode {
+	u16 mode;
+	u16 uid;
+	u32 size;
+
+	u32 last_access_time;
+	u32 creation_time;
+	u32 last_modification_time;
+	u32 deletion_time;
+
+	u16 gid;
+	u16 link_count;
+	u32 blocks;
+	u32 flags;
+	u32 os_specific_val1;
+	u32 block[15];
+	u32 generation;
+
+	u32 reserved1;
+	u32 reserved2;
+
+	u32 fragment_addr;
+	u8 os_specific_val2[12];
+};
+#define INODE_SIZE (sizeof(struct inode))
+
+struct dirent {
+	u32 inode_num;
+	u16 total_len;
+	u8 name_len;
+	u8 type_indicator;
+	u8 name[];
+};
+
+struct file {
+	struct inode inode;
+	u32 pos;
+	u8 block_index;
+	u8 *buf;
+	u32 curr_block_pos;
+};
+
+// DEMO ;)
+void ls_root();
+
+#endif
diff --git a/src/inc/ide.h b/src/inc/ide.h
new file mode 100644
index 0000000..9d753ae
--- /dev/null
+++ b/src/inc/ide.h
@@ -0,0 +1,40 @@
+// MIT License, Copyright (c) 2020 Marvin Borner
+
+#ifndef IDE_H
+#define IDE_H
+
+#include <def.h>
+
+#define BLOCK_SIZE 1024
+#define SECTOR_SIZE 512
+
+#define IDE_BUSY (1 << 7)
+#define IDE_READY (1 << 6)
+#define IDE_DRIVE_FAULT (1 << 5)
+#define IDE_ERROR (1 << 0)
+
+#define IDE_IO 0x1F0
+#define IDE_DATA 0x0
+#define IDE_FEATURES 0x1
+#define IDE_SECTOR_COUNT 0x2
+#define IDE_LOW 0x3
+#define IDE_MID 0x4
+#define IDE_HIGH 0x5
+#define IDE_HEAD 0x6
+#define IDE_CMD 0x7
+#define IDE_ALTERNATE 0x3F6
+
+#define LBA_LOW(c) ((u8)(c & 0xFF))
+#define LBA_MID(c) ((u8)(c >> 8) & 0xFF)
+#define LBA_HIGH(c) ((u8)(c >> 16) & 0xFF)
+#define LBA_LAST(c) ((u8)(c >> 24) & 0xF)
+
+#define IDE_CMD_READ (BLOCK_SIZE / SECTOR_SIZE == 1) ? 0x20 : 0xC4
+#define IDE_CMD_WRITE (BLOCK_SIZE / SECTOR_SIZE == 1) ? 0x30 : 0xC5
+#define IDE_CMD_READ_MUL 0xC4
+#define IDE_CMD_WRITE_MUL 0xC5
+
+int ide_wait(int check);
+void *ide_read(void *b, u32 block);
+
+#endif
-- 
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