Commit | Line | Data |
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1da177e4 LT |
1 | |
2 | #include <linux/kernel.h> | |
3 | #include <linux/fs.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> | |
10 | ||
11 | #include "do_mounts.h" | |
12 | ||
1da177e4 LT |
13 | int __initdata rd_prompt = 1;/* 1 = prompt for RAM disk, 0 = don't prompt */ |
14 | ||
15 | static int __init prompt_ramdisk(char *str) | |
16 | { | |
17 | rd_prompt = simple_strtol(str,NULL,0) & 1; | |
18 | return 1; | |
19 | } | |
20 | __setup("prompt_ramdisk=", prompt_ramdisk); | |
21 | ||
22 | int __initdata rd_image_start; /* starting block # of image */ | |
23 | ||
24 | static int __init ramdisk_start_setup(char *str) | |
25 | { | |
26 | rd_image_start = simple_strtol(str,NULL,0); | |
27 | return 1; | |
28 | } | |
29 | __setup("ramdisk_start=", ramdisk_start_setup); | |
30 | ||
31 | static int __init crd_load(int in_fd, int out_fd); | |
32 | ||
33 | /* | |
34 | * This routine tries to find a RAM disk image to load, and returns the | |
35 | * number of blocks to read for a non-compressed image, 0 if the image | |
36 | * is a compressed image, and -1 if an image with the right magic | |
37 | * numbers could not be found. | |
38 | * | |
39 | * We currently check for the following magic numbers: | |
40 | * minix | |
41 | * ext2 | |
42 | * romfs | |
43 | * cramfs | |
44 | * gzip | |
45 | */ | |
46 | static int __init | |
47 | identify_ramdisk_image(int fd, int start_block) | |
48 | { | |
49 | const int size = 512; | |
50 | struct minix_super_block *minixsb; | |
51 | struct ext2_super_block *ext2sb; | |
52 | struct romfs_super_block *romfsb; | |
53 | struct cramfs_super *cramfsb; | |
54 | int nblocks = -1; | |
55 | unsigned char *buf; | |
56 | ||
57 | buf = kmalloc(size, GFP_KERNEL); | |
c80544dc | 58 | if (!buf) |
1da177e4 LT |
59 | return -1; |
60 | ||
61 | minixsb = (struct minix_super_block *) buf; | |
62 | ext2sb = (struct ext2_super_block *) buf; | |
63 | romfsb = (struct romfs_super_block *) buf; | |
64 | cramfsb = (struct cramfs_super *) buf; | |
65 | memset(buf, 0xe5, size); | |
66 | ||
67 | /* | |
68 | * Read block 0 to test for gzipped kernel | |
69 | */ | |
70 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
71 | sys_read(fd, buf, size); | |
72 | ||
73 | /* | |
93fd85d0 | 74 | * If it matches the gzip magic numbers, return 0 |
1da177e4 LT |
75 | */ |
76 | if (buf[0] == 037 && ((buf[1] == 0213) || (buf[1] == 0236))) { | |
77 | printk(KERN_NOTICE | |
78 | "RAMDISK: Compressed image found at block %d\n", | |
79 | start_block); | |
80 | nblocks = 0; | |
81 | goto done; | |
82 | } | |
83 | ||
84 | /* romfs is at block zero too */ | |
85 | if (romfsb->word0 == ROMSB_WORD0 && | |
86 | romfsb->word1 == ROMSB_WORD1) { | |
87 | printk(KERN_NOTICE | |
88 | "RAMDISK: romfs filesystem found at block %d\n", | |
89 | start_block); | |
90 | nblocks = (ntohl(romfsb->size)+BLOCK_SIZE-1)>>BLOCK_SIZE_BITS; | |
91 | goto done; | |
92 | } | |
93 | ||
94 | if (cramfsb->magic == CRAMFS_MAGIC) { | |
95 | printk(KERN_NOTICE | |
96 | "RAMDISK: cramfs filesystem found at block %d\n", | |
97 | start_block); | |
98 | nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS; | |
99 | goto done; | |
100 | } | |
101 | ||
102 | /* | |
103 | * Read block 1 to test for minix and ext2 superblock | |
104 | */ | |
105 | sys_lseek(fd, (start_block+1) * BLOCK_SIZE, 0); | |
106 | sys_read(fd, buf, size); | |
107 | ||
108 | /* Try minix */ | |
109 | if (minixsb->s_magic == MINIX_SUPER_MAGIC || | |
110 | minixsb->s_magic == MINIX_SUPER_MAGIC2) { | |
111 | printk(KERN_NOTICE | |
112 | "RAMDISK: Minix filesystem found at block %d\n", | |
113 | start_block); | |
114 | nblocks = minixsb->s_nzones << minixsb->s_log_zone_size; | |
115 | goto done; | |
116 | } | |
117 | ||
118 | /* Try ext2 */ | |
119 | if (ext2sb->s_magic == cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
120 | printk(KERN_NOTICE | |
121 | "RAMDISK: ext2 filesystem found at block %d\n", | |
122 | start_block); | |
123 | nblocks = le32_to_cpu(ext2sb->s_blocks_count) << | |
124 | le32_to_cpu(ext2sb->s_log_block_size); | |
125 | goto done; | |
126 | } | |
127 | ||
128 | printk(KERN_NOTICE | |
129 | "RAMDISK: Couldn't find valid RAM disk image starting at %d.\n", | |
130 | start_block); | |
131 | ||
132 | done: | |
133 | sys_lseek(fd, start_block * BLOCK_SIZE, 0); | |
134 | kfree(buf); | |
135 | return nblocks; | |
136 | } | |
137 | ||
138 | int __init rd_load_image(char *from) | |
139 | { | |
140 | int res = 0; | |
141 | int in_fd, out_fd; | |
142 | unsigned long rd_blocks, devblocks; | |
143 | int nblocks, i, disk; | |
144 | char *buf = NULL; | |
145 | unsigned short rotate = 0; | |
347a8dc3 | 146 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
1da177e4 LT |
147 | char rotator[4] = { '|' , '/' , '-' , '\\' }; |
148 | #endif | |
149 | ||
150 | out_fd = sys_open("/dev/ram", O_RDWR, 0); | |
151 | if (out_fd < 0) | |
152 | goto out; | |
153 | ||
154 | in_fd = sys_open(from, O_RDONLY, 0); | |
155 | if (in_fd < 0) | |
156 | goto noclose_input; | |
157 | ||
158 | nblocks = identify_ramdisk_image(in_fd, rd_image_start); | |
159 | if (nblocks < 0) | |
160 | goto done; | |
161 | ||
162 | if (nblocks == 0) { | |
1da177e4 LT |
163 | if (crd_load(in_fd, out_fd) == 0) |
164 | goto successful_load; | |
1da177e4 LT |
165 | goto done; |
166 | } | |
167 | ||
168 | /* | |
169 | * NOTE NOTE: nblocks is not actually blocks but | |
170 | * the number of kibibytes of data to load into a ramdisk. | |
171 | * So any ramdisk block size that is a multiple of 1KiB should | |
172 | * work when the appropriate ramdisk_blocksize is specified | |
173 | * on the command line. | |
174 | * | |
175 | * The default ramdisk_blocksize is 1KiB and it is generally | |
176 | * silly to use anything else, so make sure to use 1KiB | |
177 | * blocksize while generating ext2fs ramdisk-images. | |
178 | */ | |
179 | if (sys_ioctl(out_fd, BLKGETSIZE, (unsigned long)&rd_blocks) < 0) | |
180 | rd_blocks = 0; | |
181 | else | |
182 | rd_blocks >>= 1; | |
183 | ||
184 | if (nblocks > rd_blocks) { | |
185 | printk("RAMDISK: image too big! (%dKiB/%ldKiB)\n", | |
186 | nblocks, rd_blocks); | |
187 | goto done; | |
188 | } | |
189 | ||
190 | /* | |
191 | * OK, time to copy in the data | |
192 | */ | |
193 | if (sys_ioctl(in_fd, BLKGETSIZE, (unsigned long)&devblocks) < 0) | |
194 | devblocks = 0; | |
195 | else | |
196 | devblocks >>= 1; | |
197 | ||
198 | if (strcmp(from, "/initrd.image") == 0) | |
199 | devblocks = nblocks; | |
200 | ||
201 | if (devblocks == 0) { | |
202 | printk(KERN_ERR "RAMDISK: could not determine device size\n"); | |
203 | goto done; | |
204 | } | |
205 | ||
206 | buf = kmalloc(BLOCK_SIZE, GFP_KERNEL); | |
d613c3e2 | 207 | if (!buf) { |
1da177e4 LT |
208 | printk(KERN_ERR "RAMDISK: could not allocate buffer\n"); |
209 | goto done; | |
210 | } | |
211 | ||
212 | printk(KERN_NOTICE "RAMDISK: Loading %dKiB [%ld disk%s] into ram disk... ", | |
213 | nblocks, ((nblocks-1)/devblocks)+1, nblocks>devblocks ? "s" : ""); | |
214 | for (i = 0, disk = 1; i < nblocks; i++) { | |
215 | if (i && (i % devblocks == 0)) { | |
216 | printk("done disk #%d.\n", disk++); | |
217 | rotate = 0; | |
218 | if (sys_close(in_fd)) { | |
219 | printk("Error closing the disk.\n"); | |
220 | goto noclose_input; | |
221 | } | |
222 | change_floppy("disk #%d", disk); | |
223 | in_fd = sys_open(from, O_RDONLY, 0); | |
224 | if (in_fd < 0) { | |
225 | printk("Error opening disk.\n"); | |
226 | goto noclose_input; | |
227 | } | |
228 | printk("Loading disk #%d... ", disk); | |
229 | } | |
230 | sys_read(in_fd, buf, BLOCK_SIZE); | |
231 | sys_write(out_fd, buf, BLOCK_SIZE); | |
347a8dc3 | 232 | #if !defined(CONFIG_S390) && !defined(CONFIG_PPC_ISERIES) |
1da177e4 LT |
233 | if (!(i % 16)) { |
234 | printk("%c\b", rotator[rotate & 0x3]); | |
235 | rotate++; | |
236 | } | |
237 | #endif | |
238 | } | |
239 | printk("done.\n"); | |
240 | ||
241 | successful_load: | |
242 | res = 1; | |
243 | done: | |
244 | sys_close(in_fd); | |
245 | noclose_input: | |
246 | sys_close(out_fd); | |
247 | out: | |
248 | kfree(buf); | |
249 | sys_unlink("/dev/ram"); | |
250 | return res; | |
251 | } | |
252 | ||
253 | int __init rd_load_disk(int n) | |
254 | { | |
255 | if (rd_prompt) | |
256 | change_floppy("root floppy disk to be loaded into RAM disk"); | |
bdaf8529 GKH |
257 | create_dev("/dev/root", ROOT_DEV); |
258 | create_dev("/dev/ram", MKDEV(RAMDISK_MAJOR, n)); | |
1da177e4 LT |
259 | return rd_load_image("/dev/root"); |
260 | } | |
261 | ||
1da177e4 LT |
262 | /* |
263 | * gzip declarations | |
264 | */ | |
265 | ||
266 | #define OF(args) args | |
267 | ||
268 | #ifndef memzero | |
269 | #define memzero(s, n) memset ((s), 0, (n)) | |
270 | #endif | |
271 | ||
272 | typedef unsigned char uch; | |
273 | typedef unsigned short ush; | |
274 | typedef unsigned long ulg; | |
275 | ||
276 | #define INBUFSIZ 4096 | |
277 | #define WSIZE 0x8000 /* window size--must be a power of two, and */ | |
278 | /* at least 32K for zip's deflate method */ | |
279 | ||
280 | static uch *inbuf; | |
281 | static uch *window; | |
282 | ||
283 | static unsigned insize; /* valid bytes in inbuf */ | |
284 | static unsigned inptr; /* index of next byte to be processed in inbuf */ | |
285 | static unsigned outcnt; /* bytes in output buffer */ | |
286 | static int exit_code; | |
287 | static int unzip_error; | |
288 | static long bytes_out; | |
289 | static int crd_infd, crd_outfd; | |
290 | ||
291 | #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf()) | |
292 | ||
293 | /* Diagnostic functions (stubbed out) */ | |
294 | #define Assert(cond,msg) | |
295 | #define Trace(x) | |
296 | #define Tracev(x) | |
297 | #define Tracevv(x) | |
298 | #define Tracec(c,x) | |
299 | #define Tracecv(c,x) | |
300 | ||
301 | #define STATIC static | |
302 | #define INIT __init | |
303 | ||
304 | static int __init fill_inbuf(void); | |
305 | static void __init flush_window(void); | |
1da177e4 | 306 | static void __init error(char *m); |
1da177e4 | 307 | |
2d6ffcca | 308 | #define NO_INFLATE_MALLOC |
1da177e4 | 309 | |
2d6ffcca | 310 | #include "../lib/inflate.c" |
1da177e4 LT |
311 | |
312 | /* =========================================================================== | |
313 | * Fill the input buffer. This is called only when the buffer is empty | |
314 | * and at least one byte is really needed. | |
315 | * Returning -1 does not guarantee that gunzip() will ever return. | |
316 | */ | |
317 | static int __init fill_inbuf(void) | |
318 | { | |
319 | if (exit_code) return -1; | |
320 | ||
321 | insize = sys_read(crd_infd, inbuf, INBUFSIZ); | |
322 | if (insize == 0) { | |
323 | error("RAMDISK: ran out of compressed data"); | |
324 | return -1; | |
325 | } | |
326 | ||
327 | inptr = 1; | |
328 | ||
329 | return inbuf[0]; | |
330 | } | |
331 | ||
332 | /* =========================================================================== | |
333 | * Write the output window window[0..outcnt-1] and update crc and bytes_out. | |
334 | * (Used for the decompressed data only.) | |
335 | */ | |
336 | static void __init flush_window(void) | |
337 | { | |
338 | ulg c = crc; /* temporary variable */ | |
339 | unsigned n, written; | |
340 | uch *in, ch; | |
341 | ||
342 | written = sys_write(crd_outfd, window, outcnt); | |
343 | if (written != outcnt && unzip_error == 0) { | |
344 | printk(KERN_ERR "RAMDISK: incomplete write (%d != %d) %ld\n", | |
345 | written, outcnt, bytes_out); | |
346 | unzip_error = 1; | |
347 | } | |
348 | in = window; | |
349 | for (n = 0; n < outcnt; n++) { | |
350 | ch = *in++; | |
351 | c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8); | |
352 | } | |
353 | crc = c; | |
354 | bytes_out += (ulg)outcnt; | |
355 | outcnt = 0; | |
356 | } | |
357 | ||
358 | static void __init error(char *x) | |
359 | { | |
360 | printk(KERN_ERR "%s\n", x); | |
361 | exit_code = 1; | |
362 | unzip_error = 1; | |
363 | } | |
364 | ||
365 | static int __init crd_load(int in_fd, int out_fd) | |
366 | { | |
367 | int result; | |
368 | ||
369 | insize = 0; /* valid bytes in inbuf */ | |
370 | inptr = 0; /* index of next byte to be processed in inbuf */ | |
371 | outcnt = 0; /* bytes in output buffer */ | |
372 | exit_code = 0; | |
373 | bytes_out = 0; | |
374 | crc = (ulg)0xffffffffL; /* shift register contents */ | |
375 | ||
376 | crd_infd = in_fd; | |
377 | crd_outfd = out_fd; | |
378 | inbuf = kmalloc(INBUFSIZ, GFP_KERNEL); | |
c80544dc | 379 | if (!inbuf) { |
1da177e4 LT |
380 | printk(KERN_ERR "RAMDISK: Couldn't allocate gzip buffer\n"); |
381 | return -1; | |
382 | } | |
383 | window = kmalloc(WSIZE, GFP_KERNEL); | |
c80544dc | 384 | if (!window) { |
1da177e4 LT |
385 | printk(KERN_ERR "RAMDISK: Couldn't allocate gzip window\n"); |
386 | kfree(inbuf); | |
387 | return -1; | |
388 | } | |
389 | makecrc(); | |
390 | result = gunzip(); | |
391 | if (unzip_error) | |
392 | result = 1; | |
393 | kfree(inbuf); | |
394 | kfree(window); | |
395 | return result; | |
396 | } |