filesystem support

git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1398 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

1 files changed, 190 insertions, 0 deletions

diff --git a/src/stream/fs/vfs.c b/src/stream/fs/vfs.c
new file mode 100644
index 0000000000..401867caec
--- /dev/null
+++ b/src/stream/fs/vfs.c
@@ -0,0 +1,190 @@
+/* Interface between GRUB's fs drivers and application code */
+
+#include <console/console.h>
+#include <fs/fs.h>
+#include <string.h>
+#include <stdlib.h>
+
+int filepos;
+int filemax;
+fs_error_t errnum;
+void (*disk_read_hook) (int, int, int);
+void (*disk_read_func) (int, int, int);
+char FSYS_BUF[FSYS_BUFLEN];
+int fsmax;
+
+struct fsys_entry {
+    char *name;
+    int (*mount_func) (void);
+    int (*read_func) (char *buf, int len);
+    int (*dir_func) (char *dirname);
+    void (*close_func) (void);
+    int (*embed_func) (int *start_sector, int needed_sectors);
+};
+
+struct fsys_entry fsys_table[] = {
+# ifdef CONFIG_FS_FAT
+    {"fat", fat_mount, fat_read, fat_dir, 0, 0},
+# endif
+# if CONFIG_FS_EXT2 == 1
+    {"ext2fs", ext2fs_mount, ext2fs_read, ext2fs_dir, 0, 0},
+# endif
+# ifdef CONFIG_FS_MINIX
+    {"minix", minix_mount, minix_read, minix_dir, 0, 0},
+# endif
+# ifdef CONFIG_FS_REISERFS
+    {"reiserfs", reiserfs_mount, reiserfs_read, reiserfs_dir, 0,
+     reiserfs_embed},
+# endif
+# ifdef CONFIG_FS_JFS
+    {"jfs", jfs_mount, jfs_read, jfs_dir, 0, jfs_embed},
+# endif
+# ifdef CONFIG_FS_XFS
+    {"xfs", xfs_mount, xfs_read, xfs_dir, 0, 0},
+# endif
+# if CONFIG_FS_ISO9660 == 1
+    {"iso9660", iso9660_mount, iso9660_read, iso9660_dir, 0, 0},
+# endif
+};
+
+/* NULLFS is used to read images from raw device */
+static int nullfs_dir(char *name)
+{
+    uint64_t dev_size;
+
+    if (name) {
+	printk_debug("can't have a named file\n");
+	return 0;
+    }
+
+    dev_size = (uint64_t) part_length << 9;
+    /* GRUB code doesn't like 2GB or bigger files */
+    if (dev_size > 0x7fffffff)
+	dev_size = 0x7fffffff;
+    filemax = dev_size;
+    return 1;
+}
+
+static int nullfs_read(char *buf, int len)
+{
+    if (devread(filepos>>9, filepos&0x1ff, len, buf)) {
+	filepos += len;
+	return len;
+    } else
+	return 0;
+}
+
+static struct fsys_entry nullfs =
+    {"nullfs", 0, nullfs_read, nullfs_dir, 0, 0};
+
+static struct fsys_entry *fsys;
+
+int mount_fs(void)
+{
+    int i;
+
+    for (i = 0; i < sizeof(fsys_table)/sizeof(fsys_table[0]); i++) {
+	if (fsys_table[i].mount_func()) {
+	    fsys = &fsys_table[i];
+	    printk_info("Mounted %s\n", fsys->name);
+	    return 1;
+	}
+    }
+    fsys = 0;
+    printk_info("Unknown filesystem type\n");
+    return 0;
+}
+
+int file_open(const char *filename)
+{
+    char *dev = 0;
+    const char *path;
+    int len;
+    int retval = 0;
+    int reopen;
+
+    path = strchr(filename, ':');
+    if (path) {
+	len = path - filename;
+	path++;
+	dev = malloc(len + 1);
+	memcpy(dev, filename, len);
+	dev[len] = '\0';
+    } else {
+	/* No colon is given. Is this device or filename? */
+	if (filename[0] == '/') {
+	    /* Anything starts with '/' must be a filename */
+	    dev = 0;
+	    path = filename;
+	} else {
+	    dev = strdup(filename);
+	    path = 0;
+	}
+    }
+    printk_debug("dev=%s, path=%s\n", dev, path);
+
+    if (dev && dev[0]) {
+	if (!devopen(dev, &reopen)) {
+	    fsys = 0;
+	    goto out;
+	}
+	if (!reopen)
+	    fsys = 0;
+    }
+
+    if (path) {
+	if (!fsys || fsys==&nullfs) {
+	    if (!mount_fs())
+		goto out;
+	}
+	using_devsize = 0;
+	if (!path[0]) {
+	    printk_info("No filename is given\n");
+	    goto out;
+	}
+    } else
+	fsys = &nullfs;
+
+    filepos = 0;
+    errnum = 0;
+    if (!fsys->dir_func((char *) path)) {
+	printk_info("File not found\n");
+	goto out;
+    }
+    retval = 1;
+out:
+    if (dev)
+	free(dev);
+    return retval;
+}
+
+int file_read(void *buf, unsigned long len)
+{
+    if (filepos < 0 || filepos > filemax)
+	filepos = filemax;
+    if (len < 0 || len > filemax-filepos)
+	len = filemax - filepos;
+    errnum = 0;
+    return fsys->read_func(buf, len);
+}
+
+int file_seek(unsigned long offset)
+{
+    filepos = offset;
+    return filepos;
+}
+
+unsigned long file_pos(void)
+{
+    return filepos;
+}
+
+unsigned long file_size(void)
+{
+    return filemax;
+}
+
+void file_close(void)
+{
+}
+