File system initialization

Simple I/O (sio) interfaced, not yet implemented

9 files changed, 159 insertions, 135 deletions

diff --git a/sw/z80/kernel/filesystem.c b/sw/z80/kernel/filesystem.c
deleted file mode 100644
index 38a5456..0000000
--- a/sw/z80/kernel/filesystem.c
+++ /dev/null
@@ -1,44 +0,0 @@
-#include "filesystem.h"
-
-struct filesystem * fs_parse_superblock(struct filesystem *fs)
-{
-
-}
-
-/* resolves an arbitrary path */                                              
-uint16_t fs_parse_path(const char *path)
-{
-
-}
-
-/* gets inode from inumber */                                                   
-inode_t * fs_get_inode(inode_t *buffer, uint16_t i_number)
-{
-
-}
-
-inode_t * fs_new_inode(inode_t *inode, const char *name)
-{
-
-}
-
-int fs_free_inode(const inode_t *inode)
-{
-
-}
-
-void fs_chmod(inode_t *inode, uint8_t mode)
-{
-
-}
-
-void fs_chown(inode_t *inode, uint8_t uid)
-{
-
-}
-
-int fs_rename(inode_t *inode, const char *name)
-{
-
-}
-
diff --git a/sw/z80/kernel/fs.c b/sw/z80/kernel/fs.c
new file mode 100644
index 0000000..3ce7f42
--- /dev/null
+++ b/sw/z80/kernel/fs.c
@@ -0,0 +1,5 @@
+#include "fs.h"
+#include "users.h"
+#include "mount.h"
+
+struct fs_mount_point * mount_points[FS_MOUNT_LIMIT];
diff --git a/sw/z80/kernel/include/filesystem.h b/sw/z80/kernel/include/filesystem.h
deleted file mode 100644
index 98c1e90..0000000
--- a/sw/z80/kernel/include/filesystem.h
+++ /dev/null
@@ -1,91 +0,0 @@
-#ifndef __FILESYSTEM_H__
-#define __FILESYSTEM_H__
-
-#include "types.h"
-
-#define FS_OFFSET 0x1000
-
-#define FS_BLOCKS_SIZE 512
-#define FS_BLOCKS_N     12
-
-#define INODE_TYPE_FILE 0
-#define INODE_TYPE_DIR  1
-#define INODE_TYPE_LINK 2
-
-typedef struct time_s
-{
-    uint16_t time;
-    uint16_t date;
-
-} time_t;
-
-
-/* on-disk structures */
-struct fs_superblock
-{
-    uint        magic :5;           /* identifier */
-    uint        serial_port :3;     /* serial port id from serial.h */
-    uint16_t    blk_size;           /* default is 512 bytes */
-    uint16_t    imap_size;          /* size of the inode table in blocks */
-    uint16_t    dmap_size;          /* size of the data blocks map in blocks */
-};
-
-
-struct fs_blk_entry
-{
-    uint16_t b_number;      /* block number */
-    uint16_t data_size;     /* bytes used   */
-};
-
-typedef struct fs_inode
-{
-
-    uint16_t    i_number;       /* identifier */
-
-    uint        i_mode :3;      /* inode mode (rwx) */
-    uint        i_uid :3;       /* user (owner) id  */
-    uint        i_type :2;      /* inode type */
-
-    uint8_t     i_blocks;       /* number of blocks */
-    struct fs_blk_entry   i_block[FS_BLOCKS_N];   /* direct blocks */
-    
-    uint16_t     parent;
-
-} inode_t;
-
-/* inode table structures */
-/* i_number is derived from location */
-struct fs_inode_entry
-{
-    uint8_t     str_len;
-    char        name[24];
-};
-
-/* filesystem struct for the operating system */
-struct filesystem
-{
-    size_t size;
-    size_t fsize;
-    inode_t *mntpt;
-};
-
-struct filesystem * fs_parse_superblock(struct filesystem *fs);
-
-/* resolves an arbitrary path */
-uint16_t fs_parse_path(const char *path);
-
-/* gets inode from inumber */
-inode_t * fs_get_inode(inode_t *buffer, uint16_t i_number);
-
-inode_t * fs_new_inode(inode_t *inode, const char *name);
-
-int fs_free_inode(const inode_t *inode);
-
-void fs_chmod(inode_t *inode, uint8_t mode);
-
-void fs_chown(inode_t *inode, uint8_t uid);
-
-int fs_rename(inode_t *inode, const char *name);
-
-
-#endif // __FILESYSTEM_H__
diff --git a/sw/z80/kernel/include/fs/dirent.h b/sw/z80/kernel/include/fs/dirent.h
new file mode 100644
index 0000000..ea5699b
--- /dev/null
+++ b/sw/z80/kernel/include/fs/dirent.h
@@ -0,0 +1,13 @@
+#ifndef DIRENT_H
+#define DIRENT_H
+
+#include "types.h"
+
+struct dirent
+{
+    ino_t       i_number;       // inode referred
+    uint8_t     name_size;    // size of the name
+    char        name[];         // name of the referred inode
+}
+
+#endif
diff --git a/sw/z80/kernel/include/fs/fs.h b/sw/z80/kernel/include/fs/fs.h
new file mode 100644
index 0000000..62bef36
--- /dev/null
+++ b/sw/z80/kernel/include/fs/fs.h
@@ -0,0 +1,65 @@
+#ifndef INODE_H
+#define INODE_H
+
+#include "types.h"
+
+#define FS_OFFSET 0x1000
+
+#define FS_BLOCKS_SIZE 512
+#define FS_BLOCKS_N     8
+#define FS_BLOCKS_IND   6
+
+#define INODE_TYPE_FILE   0x0
+#define INODE_TYPE_DIR    0x1
+#define INODE_TYPE_HLINK    0x2
+#define INODE_TYPE_SLINK    0x3
+
+typedef struct time_s
+{
+    struct
+    {
+        uint    minutes :6;
+        uint    hour    :5;
+
+    } time;
+
+    struct
+    {
+        uint    day     :5;
+        uint    month   :4;
+        uint    year    :12;
+
+    } date;
+
+} time_t;
+
+struct fs_superblock
+{
+    uint8_t     magic;           // identifier
+
+    uint16_t    blk_size;           // size of a single block
+    uint16_t    imap_size;          // quantity of inodes
+    uint16_t    dmap_size;          // quantity of blocks
+}
+
+struct fs_inode
+{
+    
+    /* inode meta data */
+    uint        mode :3;  // chmod
+    uint        uid :3;   // chown
+    uint        type :2;  // file, dir, hard-link, sym-link
+
+    /* data storage informations */
+    uint24_t     size;
+    uint16_t     blocks[FS_BLOCKS_N];
+
+}
+
+struct fs_inumber
+{
+    uint    dev : 4;    // device id, global in the fs
+    ino_t   rel;    // inode id relative to the volume
+}
+
+#endif
diff --git a/sw/z80/kernel/include/fs/mount.h b/sw/z80/kernel/include/fs/mount.h
new file mode 100644
index 0000000..a0edd5d
--- /dev/null
+++ b/sw/z80/kernel/include/fs/mount.h
@@ -0,0 +1,15 @@
+#ifndef MOUNT_H
+#define MOUNT_H
+
+#include "fs.h"
+
+#define FS_MOUNT_LIMIT 16
+
+struct fs_mount_point
+{
+    struct fs_inumber       inode;          // dir mounted
+    uint                    serial_port :4;
+    struct fs_superblock    superblock;     // block informations
+}
+
+#endif
diff --git a/sw/z80/kernel/include/fs/users.h b/sw/z80/kernel/include/fs/users.h
new file mode 100644
index 0000000..7e4016b
--- /dev/null
+++ b/sw/z80/kernel/include/fs/users.h
@@ -0,0 +1,6 @@
+#ifndef USERS_H
+#define USERS_H
+
+
+
+#endif
diff --git a/sw/z80/kernel/include/sio.h b/sw/z80/kernel/include/sio.h
new file mode 100644
index 0000000..9dc47f6
--- /dev/null
+++ b/sw/z80/kernel/include/sio.h
@@ -0,0 +1,49 @@
+#ifndef SIO_H
+#define SIO_H
+
+#include "types.h"
+
+#define SIO_ROM 0x0
+
+#define SIO_PORT_1 0x1
+#define SIO_PORT_2 0x2
+#define SIO_PORT_3 0x3
+#define SIO_PORT_4 0x4
+#define SIO_PORT_5 0x5
+#define SIO_PORT_6 0x6
+#define SIO_PORT_7 0x7
+
+/* initialize serial interface */
+void sio_init();
+
+/* return the device address in the address space */
+void * sio_dev_addr(uint8_t dev);
+/* return the driver id to be used on dev */
+uint8_t sio_dev_driver(uint8_t dev);
+
+/* set current device in use */
+void sio_set_dev(uint8_t dev);
+/* get current device in use */
+uint8_t sio_cdev();
+
+/* get pointer in given device */
+uint16_t sio_tellg(uint8_t dev);
+/* get pointer in current device */
+uint16_t sio_ctellg();
+
+/* set pointer in given device */
+int sio_seekg(uint8_t dev, uint16_t value);
+/* set pointer in current device */
+int sio_seekg(uint16_t value);
+
+/* syscall: read one byte from the current device */
+uint8_t sio_recv();
+/* syscall: write one byte into the current device */
+void sio_send(uint8_t value);
+
+/* read n bytes from the current device */
+char * sio_read(uint8_t *buffer, size_t n);
+/* write n bytes into the current device */
+int sio_write(const uint8_t *buffer, size_t n);
+
+#endif
diff --git a/sw/z80/kernel/include/types.h b/sw/z80/kernel/include/types.h
index 7c1424a..b822144 100644
--- a/sw/z80/kernel/include/types.h
+++ b/sw/z80/kernel/include/types.h
@@ -15,4 +15,10 @@
 #define size_t      uint16_t
 #define pid_t 		uint8_t
 
+#define ino_t       uint16_t
+
+typedef struct {
+    uint    data : 24;
+} uint24_t;
+
 #endif