2 #include <linux/kernel.h>
4 #include <linux/minix_fs.h>
5 #include <linux/ext2_fs.h>
6 #include <linux/romfs_fs.h>
7 #include <linux/cramfs_fs.h>
8 #include <linux/initrd.h>
9 #include <linux/string.h>
11 #include "do_mounts.h"
12 #include "../fs/squashfs/squashfs_fs.h"
14 int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */
16 static int __init prompt_ramdisk(char *str)
18 rd_prompt = simple_strtol(str,NULL,0) & 1;
21 __setup("prompt_ramdisk=", prompt_ramdisk);
23 int __initdata rd_image_start; /* starting block # of image */
25 static int __init ramdisk_start_setup(char *str)
27 rd_image_start = simple_strtol(str,NULL,0);
30 __setup("ramdisk_start=", ramdisk_start_setup);
32 static int __init crd_load(int in_fd, int out_fd);
35 * This routine tries to find a RAM disk image to load, and returns the
36 * number of blocks to read for a non-compressed image, 0 if the image
37 * is a compressed image, and -1 if an image with the right magic
38 * numbers could not be found.
40 * We currently check for the following magic numbers:
49 identify_ramdisk_image(int fd, int start_block)
52 struct minix_super_block *minixsb;
53 struct ext2_super_block *ext2sb;
54 struct romfs_super_block *romfsb;
55 struct cramfs_super *cramfsb;
56 struct squashfs_super_block *squashfsb;
60 buf = kmalloc(size, GFP_KERNEL);
64 minixsb = (struct minix_super_block *) buf;
65 ext2sb = (struct ext2_super_block *) buf;
66 romfsb = (struct romfs_super_block *) buf;
67 cramfsb = (struct cramfs_super *) buf;
68 squashfsb = (struct squashfs_super_block *) buf;
69 memset(buf, 0xe5, size);
72 * Read block 0 to test for gzipped kernel
74 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
75 sys_read(fd, buf, size);
78 * If it matches the gzip magic numbers, return 0
80 if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) {
82 "RAMDISK: Compressed image found at block %d\n",
88 /* romfs is at block zero too */
89 if (romfsb->word0 == ROMSB_WORD0 &&
90 romfsb->word1 == ROMSB_WORD1) {
92 "RAMDISK: romfs filesystem found at block %d\n",
94 nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS;
98 if (cramfsb->magic == CRAMFS_MAGIC) {
100 "RAMDISK: cramfs filesystem found at block %d\n",
102 nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
106 /* squashfs is at block zero too */
107 if (le32_to_cpu(squashfsb->s_magic) == SQUASHFS_MAGIC) {
109 "RAMDISK: squashfs filesystem found at block %d\n",
111 nblocks = (le64_to_cpu(squashfsb->bytes_used) + BLOCK_SIZE - 1)
117 * Read block 1 to test for minix and ext2 superblock
119 sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0);
120 sys_read(fd, buf, size);
123 if (minixsb->s_magic == MINIX_SUPER_MAGIC ||
124 minixsb->s_magic == MINIX_SUPER_MAGIC2) {
126 "RAMDISK: Minix filesystem found at block %d\n",
128 nblocks = minixsb->s_nzones << minixsb->s_log_zone_size;
133 if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) {
135 "RAMDISK: ext2 filesystem found at block %d\n",
137 nblocks = le32_to_cpu(ext2sb->s_blocks_count) <<
138 le32_to_cpu(ext2sb->s_log_block_size);
143 "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n",
147 sys_lseek(fd, start_block * BLOCK_SIZE, 0);
152 int __init rd_load_image(char *from)
156 unsigned long rd_blocks, devblocks;
157 int nblocks, i, disk;
159 unsigned short rotate = 0;
160 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
161 char rotator[4] = { '|' , '/' , '-' , '\\' };
164 out_fd = sys_open("/dev/ram", O_RDWR, 0);
168 in_fd = sys_open(from, O_RDONLY, 0);
172 nblocks = identify_ramdisk_image(in_fd, rd_image_start);
177 if (crd_load(in_fd, out_fd) == 0)
178 goto successful_load;
183 * NOTE NOTE: nblocks is not actually blocks but
184 * the number of kibibytes of data to load into a ramdisk.
185 * So any ramdisk block size that is a multiple of 1KiB should
186 * work when the appropriate ramdisk_blocksize is specified
187 * on the command line.
189 * The default ramdisk_blocksize is 1KiB and it is generally
190 * silly to use anything else, so make sure to use 1KiB
191 * blocksize while generating ext2fs ramdisk-images.
193 if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0)
198 if (nblocks > rd_blocks) {
199 printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n",
205 * OK, time to copy in the data
207 if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0)
212 if (strcmp(from, "/initrd.image") == 0)
215 if (devblocks == 0) {
216 printk(KERN_ERR "RAMDISK: could not determine device size\n");
220 buf = kmalloc(BLOCK_SIZE, GFP_KERNEL);
222 printk(KERN_ERR "RAMDISK: could not allocate buffer\n");
226 printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ",
227 nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : "");
228 for (i = 0, disk = 1; i < nblocks; i++) {
229 if (i && (i % devblocks == 0)) {
230 printk("done disk #%d.\n", disk++);
232 if (sys_close(in_fd)) {
233 printk("Error closing the disk.\n");
236 change_floppy("disk #%d", disk);
237 in_fd = sys_open(from, O_RDONLY, 0);
239 printk("Error opening disk.\n");
242 printk("Loading disk #%d... ", disk);
244 sys_read(in_fd, buf, BLOCK_SIZE);
245 sys_write(out_fd, buf, BLOCK_SIZE);
246 #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES)
248 printk("%c\b", rotator[rotate & 0x3]);
263 sys_unlink("/dev/ram");
267 int __init rd_load_disk(int n)
270 change_floppy("root floppy disk to be loaded into RAM disk");
271 create_dev("/dev/root", ROOT_DEV);
272 create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n));
273 return rd_load_image("/dev/root");
280 #define OF(args) args
283 #define memzero(s, n) memset ((s), 0, (n))
286 typedef unsigned char uch;
287 typedef unsigned short ush;
288 typedef unsigned long ulg;
290 #define INBUFSIZ 4096
291 #define WSIZE 0x8000 /* window size--must be a power of two, and */
292 /* at least 32K for zip's deflate method */
297 static unsigned insize; /* valid bytes in inbuf */
298 static unsigned inptr; /* index of next byte to be processed in inbuf */
299 static unsigned outcnt; /* bytes in output buffer */
300 static int exit_code;
301 static int unzip_error;
302 static long bytes_out;
303 static int crd_infd, crd_outfd;
305 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
307 /* Diagnostic functions (stubbed out) */
308 #define Assert(cond,msg)
315 #define STATIC static
318 static int __init fill_inbuf(void);
319 static void __init flush_window(void);
320 static void __init error(char *m);
322 #define NO_INFLATE_MALLOC
324 #include "../lib/inflate.c"
326 /* ===========================================================================
327 * Fill the input buffer. This is called only when the buffer is empty
328 * and at least one byte is really needed.
329 * Returning -1 does not guarantee that gunzip() will ever return.
331 static int __init fill_inbuf(void)
333 if (exit_code) return -1;
335 insize = sys_read(crd_infd, inbuf, INBUFSIZ);
337 error("RAMDISK: ran out of compressed data");
346 /* ===========================================================================
347 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
348 * (Used for the decompressed data only.)
350 static void __init flush_window(void)
352 ulg c = crc; /* temporary variable */
356 written = sys_write(crd_outfd, window, outcnt);
357 if (written != outcnt && unzip_error == 0) {
358 printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n",
359 written, outcnt, bytes_out);
363 for (n = 0; n < outcnt; n++) {
365 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
368 bytes_out += (ulg)outcnt;
372 static void __init error(char *x)
374 printk(KERN_ERR "%s\n", x);
379 static int __init crd_load(int in_fd, int out_fd)
383 insize = 0; /* valid bytes in inbuf */
384 inptr = 0; /* index of next byte to be processed in inbuf */
385 outcnt = 0; /* bytes in output buffer */
388 crc = (ulg)0xffffffffL; /* shift register contents */
392 inbuf = kmalloc(INBUFSIZ, GFP_KERNEL);
394 printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n");
397 window = kmalloc(WSIZE, GFP_KERNEL);
399 printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n");