URL https://opencores.org/ocsvn/test_project/test_project/trunk

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [init/] [initramfs.c] - Blame information for rev 79

Go to most recent revision | Details | Compare with Previous | View Log


#include <linux/init.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/syscalls.h>
 
static __initdata char *message;
static void __init error(char *x)
{
        if (!message)
                message = x;
}
 
static void __init *malloc(size_t size)
{
        return kmalloc(size, GFP_KERNEL);
}
 
static void __init free(void *where)
{
        kfree(where);
}
 
/* link hash */
 
#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)
 
static __initdata struct hash {
        int ino, minor, major;
        mode_t mode;
        struct hash *next;
        char name[N_ALIGN(PATH_MAX)];
} *head[32];
 
static inline int hash(int major, int minor, int ino)
{
        unsigned long tmp = ino + minor + (major << 3);
        tmp += tmp >> 5;
        return tmp & 31;
}
 
static char __init *find_link(int major, int minor, int ino,
                              mode_t mode, char *name)
{
        struct hash **p, *q;
        for (p = head + hash(major, minor, ino); *p; p = &(*p)->next) {
                if ((*p)->ino != ino)
                        continue;
                if ((*p)->minor != minor)
                        continue;
                if ((*p)->major != major)
                        continue;
                if (((*p)->mode ^ mode) & S_IFMT)
                        continue;
                return (*p)->name;
        }
        q = (struct hash *)malloc(sizeof(struct hash));
        if (!q)
                panic("can't allocate link hash entry");
        q->major = major;
        q->minor = minor;
        q->ino = ino;
        q->mode = mode;
        strcpy(q->name, name);
        q->next = NULL;
        *p = q;
        return NULL;
}
 
static void __init free_hash(void)
{
        struct hash **p, *q;
        for (p = head; p < head + 32; p++) {
                while (*p) {
                        q = *p;
                        *p = q->next;
                        free(q);
                }
        }
}
 
/* cpio header parsing */
 
static __initdata unsigned long ino, major, minor, nlink;
static __initdata mode_t mode;
static __initdata unsigned long body_len, name_len;
static __initdata uid_t uid;
static __initdata gid_t gid;
static __initdata unsigned rdev;
 
static void __init parse_header(char *s)
{
        unsigned long parsed[12];
        char buf[9];
        int i;
 
        buf[8] = '\0';
        for (i = 0, s += 6; i < 12; i++, s += 8) {
                memcpy(buf, s, 8);
                parsed[i] = simple_strtoul(buf, NULL, 16);
        }
        ino = parsed[0];
        mode = parsed[1];
        uid = parsed[2];
        gid = parsed[3];
        nlink = parsed[4];
        body_len = parsed[6];
        major = parsed[7];
        minor = parsed[8];
        rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));
        name_len = parsed[11];
}
 
/* FSM */
 
static __initdata enum state {
        Start,
        Collect,
        GotHeader,
        SkipIt,
        GotName,
        CopyFile,
        GotSymlink,
        Reset
} state, next_state;
 
static __initdata char *victim;
static __initdata unsigned count;
static __initdata loff_t this_header, next_header;
 
static __initdata int dry_run;
 
static inline void __init eat(unsigned n)
{
        victim += n;
        this_header += n;
        count -= n;
}
 
static __initdata char *collected;
static __initdata int remains;
static __initdata char *collect;
 
static void __init read_into(char *buf, unsigned size, enum state next)
{
        if (count >= size) {
                collected = victim;
                eat(size);
                state = next;
        } else {
                collect = collected = buf;
                remains = size;
                next_state = next;
                state = Collect;
        }
}
 
static __initdata char *header_buf, *symlink_buf, *name_buf;
 
static int __init do_start(void)
{
        read_into(header_buf, 110, GotHeader);
        return 0;
}
 
static int __init do_collect(void)
{
        unsigned n = remains;
        if (count < n)
                n = count;
        memcpy(collect, victim, n);
        eat(n);
        collect += n;
        if ((remains -= n) != 0)
                return 1;
        state = next_state;
        return 0;
}
 
static int __init do_header(void)
{
        if (memcmp(collected, "070707", 6)==0) {
                error("incorrect cpio method used: use -H newc option");
                return 1;
        }
        if (memcmp(collected, "070701", 6)) {
                error("no cpio magic");
                return 1;
        }
        parse_header(collected);
        next_header = this_header + N_ALIGN(name_len) + body_len;
        next_header = (next_header + 3) & ~3;
        if (dry_run) {
                read_into(name_buf, N_ALIGN(name_len), GotName);
                return 0;
        }
        state = SkipIt;
        if (name_len <= 0 || name_len > PATH_MAX)
                return 0;
        if (S_ISLNK(mode)) {
                if (body_len > PATH_MAX)
                        return 0;
                collect = collected = symlink_buf;
                remains = N_ALIGN(name_len) + body_len;
                next_state = GotSymlink;
                state = Collect;
                return 0;
        }
        if (S_ISREG(mode) || !body_len)
                read_into(name_buf, N_ALIGN(name_len), GotName);
        return 0;
}
 
static int __init do_skip(void)
{
        if (this_header + count < next_header) {
                eat(count);
                return 1;
        } else {
                eat(next_header - this_header);
                state = next_state;
                return 0;
        }
}
 
static int __init do_reset(void)
{
        while(count && *victim == '\0')
                eat(1);
        if (count && (this_header & 3))
                error("broken padding");
        return 1;
}
 
static int __init maybe_link(void)
{
        if (nlink >= 2) {
                char *old = find_link(major, minor, ino, mode, collected);
                if (old)
                        return (sys_link(old, collected) < 0) ? -1 : 1;
        }
        return 0;
}
 
static void __init clean_path(char *path, mode_t mode)
{
        struct stat st;
 
        if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {
                if (S_ISDIR(st.st_mode))
                        sys_rmdir(path);
                else
                        sys_unlink(path);
        }
}
 
static __initdata int wfd;
 
static int __init do_name(void)
{
        state = SkipIt;
        next_state = Reset;
        if (strcmp(collected, "TRAILER!!!") == 0) {
                free_hash();
                return 0;
        }
        if (dry_run)
                return 0;
        clean_path(collected, mode);
        if (S_ISREG(mode)) {
                int ml = maybe_link();
                if (ml >= 0) {
                        int openflags = O_WRONLY|O_CREAT;
                        if (ml != 1)
                                openflags |= O_TRUNC;
                        wfd = sys_open(collected, openflags, mode);
 
                        if (wfd >= 0) {
                                sys_fchown(wfd, uid, gid);
                                sys_fchmod(wfd, mode);
                                state = CopyFile;
                        }
                }
        } else if (S_ISDIR(mode)) {
                sys_mkdir(collected, mode);
                sys_chown(collected, uid, gid);
                sys_chmod(collected, mode);
        } else if (S_ISBLK(mode) || S_ISCHR(mode) ||
                   S_ISFIFO(mode) || S_ISSOCK(mode)) {
                if (maybe_link() == 0) {
                        sys_mknod(collected, mode, rdev);
                        sys_chown(collected, uid, gid);
                        sys_chmod(collected, mode);
                }
        }
        return 0;
}
 
static int __init do_copy(void)
{
        if (count >= body_len) {
                sys_write(wfd, victim, body_len);
                sys_close(wfd);
                eat(body_len);
                state = SkipIt;
                return 0;
        } else {
                sys_write(wfd, victim, count);
                body_len -= count;
                eat(count);
                return 1;
        }
}
 
static int __init do_symlink(void)
{
        collected[N_ALIGN(name_len) + body_len] = '\0';
        clean_path(collected, 0);
        sys_symlink(collected + N_ALIGN(name_len), collected);
        sys_lchown(collected, uid, gid);
        state = SkipIt;
        next_state = Reset;
        return 0;
}
 
static __initdata int (*actions[])(void) = {
        [Start]         = do_start,
        [Collect]       = do_collect,
        [GotHeader]     = do_header,
        [SkipIt]        = do_skip,
        [GotName]       = do_name,
        [CopyFile]      = do_copy,
        [GotSymlink]    = do_symlink,
        [Reset]         = do_reset,
};
 
static int __init write_buffer(char *buf, unsigned len)
{
        count = len;
        victim = buf;
 
        while (!actions[state]())
                ;
        return len - count;
}
 
static void __init flush_buffer(char *buf, unsigned len)
{
        int written;
        if (message)
                return;
        while ((written = write_buffer(buf, len)) < len && !message) {
                char c = buf[written];
                if (c == '0') {
                        buf += written;
                        len -= written;
                        state = Start;
                } else if (c == 0) {
                        buf += written;
                        len -= written;
                        state = Reset;
                } else
                        error("junk in compressed archive");
        }
}
 
/*
 * gzip declarations
 */
 
#define OF(args)  args
 
#ifndef memzero
#define memzero(s, n)     memset ((s), 0, (n))
#endif
 
typedef unsigned char  uch;
typedef unsigned short ush;
typedef unsigned long  ulg;
 
#define WSIZE 0x8000    /* window size--must be a power of two, and */
                        /*  at least 32K for zip's deflate method */
 
static uch *inbuf;
static uch *window;
 
static unsigned insize;  /* valid bytes in inbuf */
static unsigned inptr;   /* index of next byte to be processed in inbuf */
static unsigned outcnt;  /* bytes in output buffer */
static long bytes_out;
 
#define get_byte()  (inptr < insize ? inbuf[inptr++] : -1)
 
/* Diagnostic functions (stubbed out) */
#define Assert(cond,msg)
#define Trace(x)
#define Tracev(x)
#define Tracevv(x)
#define Tracec(c,x)
#define Tracecv(c,x)
 
#define STATIC static
#define INIT __init
 
static void __init flush_window(void);
static void __init error(char *m);
static void __init gzip_mark(void **);
static void __init gzip_release(void **);
 
#include "../lib/inflate.c"
 
static void __init gzip_mark(void **ptr)
{
}
 
static void __init gzip_release(void **ptr)
{
}
 
/* ===========================================================================
 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
 * (Used for the decompressed data only.)
 */
static void __init flush_window(void)
{
        ulg c = crc;         /* temporary variable */
        unsigned n;
        uch *in, ch;
 
        flush_buffer(window, outcnt);
        in = window;
        for (n = 0; n < outcnt; n++) {
                ch = *in++;
                c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
        }
        crc = c;
        bytes_out += (ulg)outcnt;
        outcnt = 0;
}
 
static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)
{
        int written;
        dry_run = check_only;
        header_buf = malloc(110);
        symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);
        name_buf = malloc(N_ALIGN(PATH_MAX));
        window = malloc(WSIZE);
        if (!window || !header_buf || !symlink_buf || !name_buf)
                panic("can't allocate buffers");
        state = Start;
        this_header = 0;
        message = NULL;
        while (!message && len) {
                loff_t saved_offset = this_header;
                if (*buf == '0' && !(this_header & 3)) {
                        state = Start;
                        written = write_buffer(buf, len);
                        buf += written;
                        len -= written;
                        continue;
                }
                if (!*buf) {
                        buf++;
                        len--;
                        this_header++;
                        continue;
                }
                this_header = 0;
                insize = len;
                inbuf = buf;
                inptr = 0;
                outcnt = 0;              /* bytes in output buffer */
                bytes_out = 0;
                crc = (ulg)0xffffffffL; /* shift register contents */
                makecrc();
                gunzip();
                if (state != Reset)
                        error("junk in gzipped archive");
                this_header = saved_offset + inptr;
                buf += inptr;
                len -= inptr;
        }
        free(window);
        free(name_buf);
        free(symlink_buf);
        free(header_buf);
        return message;
}
 
static int __initdata do_retain_initrd;
 
static int __init retain_initrd_param(char *str)
{
        if (*str)
                return 0;
        do_retain_initrd = 1;
        return 1;
}
__setup("retain_initrd", retain_initrd_param);
 
extern char __initramfs_start[], __initramfs_end[];
#ifdef CONFIG_BLK_DEV_INITRD
#include <linux/initrd.h>
#include <linux/kexec.h>
 
static void __init free_initrd(void)
{
#ifdef CONFIG_KEXEC
        unsigned long crashk_start = (unsigned long)__va(crashk_res.start);
        unsigned long crashk_end   = (unsigned long)__va(crashk_res.end);
#endif
        if (do_retain_initrd)
                goto skip;
 
#ifdef CONFIG_KEXEC
        /*
         * If the initrd region is overlapped with crashkernel reserved region,
         * free only memory that is not part of crashkernel region.
         */
        if (initrd_start < crashk_end && initrd_end > crashk_start) {
                /*
                 * Initialize initrd memory region since the kexec boot does
                 * not do.
                 */
                memset((void *)initrd_start, 0, initrd_end - initrd_start);
                if (initrd_start < crashk_start)
                        free_initrd_mem(initrd_start, crashk_start);
                if (initrd_end > crashk_end)
                        free_initrd_mem(crashk_end, initrd_end);
        } else
#endif
                free_initrd_mem(initrd_start, initrd_end);
skip:
        initrd_start = 0;
        initrd_end = 0;
}
 
#endif
 
static int __init populate_rootfs(void)
{
        char *err = unpack_to_rootfs(__initramfs_start,
                         __initramfs_end - __initramfs_start, 0);
        if (err)
                panic(err);
#ifdef CONFIG_BLK_DEV_INITRD
        if (initrd_start) {
#ifdef CONFIG_BLK_DEV_RAM
                int fd;
                printk(KERN_INFO "checking if image is initramfs...");
                err = unpack_to_rootfs((char *)initrd_start,
                        initrd_end - initrd_start, 1);
                if (!err) {
                        printk(" it is\n");
                        unpack_to_rootfs((char *)initrd_start,
                                initrd_end - initrd_start, 0);
                        free_initrd();
                        return 0;
                }
                printk("it isn't (%s); looks like an initrd\n", err);
                fd = sys_open("/initrd.image", O_WRONLY|O_CREAT, 0700);
                if (fd >= 0) {
                        sys_write(fd, (char *)initrd_start,
                                        initrd_end - initrd_start);
                        sys_close(fd);
                        free_initrd();
                }
#else
                printk(KERN_INFO "Unpacking initramfs...");
                err = unpack_to_rootfs((char *)initrd_start,
                        initrd_end - initrd_start, 0);
                if (err)
                        panic(err);
                printk(" done\n");
                free_initrd();
#endif
        }
#endif
        return 0;
}
rootfs_initcall(populate_rootfs);

Browse

Tools

Subversion Repositories test_project

[/] [test_project/] [trunk/] [linux_sd_driver/] [init/] [initramfs.c] - Blame information for rev 79

Line No.	Rev	Author	Line
1	62	marcus.erl	`#include <linux/init.h>`
2			`#include <linux/fs.h>`
3			`#include <linux/slab.h>`
4			`#include <linux/types.h>`
5			`#include <linux/fcntl.h>`
6			`#include <linux/delay.h>`
7			`#include <linux/string.h>`
8			`#include <linux/syscalls.h>`
9
10			`static __initdata char *message;`
11			`static void __init error(char *x)`
12			`{`
13			`if (!message)`
14			`message = x;`
15			`}`
16
17			`static void __init *malloc(size_t size)`
18			`{`
19			`return kmalloc(size, GFP_KERNEL);`
20			`}`
21
22			`static void __init free(void *where)`
23			`{`
24			`kfree(where);`
25			`}`
26
27			`/* link hash */`
28
29			`#define N_ALIGN(len) ((((len) + 1) & ~3) + 2)`
30
31			`static __initdata struct hash {`
32			`int ino, minor, major;`
33			`mode_t mode;`
34			`struct hash *next;`
35			`char name[N_ALIGN(PATH_MAX)];`
36			`} *head[32];`
37
38			`static inline int hash(int major, int minor, int ino)`
39			`{`
40			`unsigned long tmp = ino + minor + (major << 3);`
41			`tmp += tmp >> 5;`
42			`return tmp & 31;`
43			`}`
44
45			`static char __init *find_link(int major, int minor, int ino,`
46			`mode_t mode, char *name)`
47			`{`
48			`struct hash *p, q;`
49			`for (p = head + hash(major, minor, ino); p; p = &(p)->next) {`
50			`if ((*p)->ino != ino)`
51			`continue;`
52			`if ((*p)->minor != minor)`
53			`continue;`
54			`if ((*p)->major != major)`
55			`continue;`
56			`if (((*p)->mode ^ mode) & S_IFMT)`
57			`continue;`
58			`return (*p)->name;`
59			`}`
60			`q = (struct hash *)malloc(sizeof(struct hash));`
61			`if (!q)`
62			`panic("can't allocate link hash entry");`
63			`q->major = major;`
64			`q->minor = minor;`
65			`q->ino = ino;`
66			`q->mode = mode;`
67			`strcpy(q->name, name);`
68			`q->next = NULL;`
69			`*p = q;`
70			`return NULL;`
71			`}`
72
73			`static void __init free_hash(void)`
74			`{`
75			`struct hash *p, q;`
76			`for (p = head; p < head + 32; p++) {`
77			`while (*p) {`
78			`q = *p;`
79			`*p = q->next;`
80			`free(q);`
81			`}`
82			`}`
83			`}`
84
85			`/* cpio header parsing */`
86
87			`static __initdata unsigned long ino, major, minor, nlink;`
88			`static __initdata mode_t mode;`
89			`static __initdata unsigned long body_len, name_len;`
90			`static __initdata uid_t uid;`
91			`static __initdata gid_t gid;`
92			`static __initdata unsigned rdev;`
93
94			`static void __init parse_header(char *s)`
95			`{`
96			`unsigned long parsed[12];`
97			`char buf[9];`
98			`int i;`
99
100			`buf[8] = '\0';`
101			`for (i = 0, s += 6; i < 12; i++, s += 8) {`
102			`memcpy(buf, s, 8);`
103			`parsed[i] = simple_strtoul(buf, NULL, 16);`
104			`}`
105			`ino = parsed[0];`
106			`mode = parsed[1];`
107			`uid = parsed[2];`
108			`gid = parsed[3];`
109			`nlink = parsed[4];`
110			`body_len = parsed[6];`
111			`major = parsed[7];`
112			`minor = parsed[8];`
113			`rdev = new_encode_dev(MKDEV(parsed[9], parsed[10]));`
114			`name_len = parsed[11];`
115			`}`
116
117			`/* FSM */`
118
119			`static __initdata enum state {`
120			`Start,`
121			`Collect,`
122			`GotHeader,`
123			`SkipIt,`
124			`GotName,`
125			`CopyFile,`
126			`GotSymlink,`
127			`Reset`
128			`} state, next_state;`
129
130			`static __initdata char *victim;`
131			`static __initdata unsigned count;`
132			`static __initdata loff_t this_header, next_header;`
133
134			`static __initdata int dry_run;`
135
136			`static inline void __init eat(unsigned n)`
137			`{`
138			`victim += n;`
139			`this_header += n;`
140			`count -= n;`
141			`}`
142
143			`static __initdata char *collected;`
144			`static __initdata int remains;`
145			`static __initdata char *collect;`
146
147			`static void __init read_into(char *buf, unsigned size, enum state next)`
148			`{`
149			`if (count >= size) {`
150			`collected = victim;`
151			`eat(size);`
152			`state = next;`
153			`} else {`
154			`collect = collected = buf;`
155			`remains = size;`
156			`next_state = next;`
157			`state = Collect;`
158			`}`
159			`}`
160
161			`static __initdata char header_buf, symlink_buf, *name_buf;`
162
163			`static int __init do_start(void)`
164			`{`
165			`read_into(header_buf, 110, GotHeader);`
166			`return 0;`
167			`}`
168
169			`static int __init do_collect(void)`
170			`{`
171			`unsigned n = remains;`
172			`if (count < n)`
173			`n = count;`
174			`memcpy(collect, victim, n);`
175			`eat(n);`
176			`collect += n;`
177			`if ((remains -= n) != 0)`
178			`return 1;`
179			`state = next_state;`
180			`return 0;`
181			`}`
182
183			`static int __init do_header(void)`
184			`{`
185			`if (memcmp(collected, "070707", 6)==0) {`
186			`error("incorrect cpio method used: use -H newc option");`
187			`return 1;`
188			`}`
189			`if (memcmp(collected, "070701", 6)) {`
190			`error("no cpio magic");`
191			`return 1;`
192			`}`
193			`parse_header(collected);`
194			`next_header = this_header + N_ALIGN(name_len) + body_len;`
195			`next_header = (next_header + 3) & ~3;`
196			`if (dry_run) {`
197			`read_into(name_buf, N_ALIGN(name_len), GotName);`
198			`return 0;`
199			`}`
200			`state = SkipIt;`
201			`if (name_len <= 0 \|\| name_len > PATH_MAX)`
202			`return 0;`
203			`if (S_ISLNK(mode)) {`
204			`if (body_len > PATH_MAX)`
205			`return 0;`
206			`collect = collected = symlink_buf;`
207			`remains = N_ALIGN(name_len) + body_len;`
208			`next_state = GotSymlink;`
209			`state = Collect;`
210			`return 0;`
211			`}`
212			`if (S_ISREG(mode) \|\| !body_len)`
213			`read_into(name_buf, N_ALIGN(name_len), GotName);`
214			`return 0;`
215			`}`
216
217			`static int __init do_skip(void)`
218			`{`
219			`if (this_header + count < next_header) {`
220			`eat(count);`
221			`return 1;`
222			`} else {`
223			`eat(next_header - this_header);`
224			`state = next_state;`
225			`return 0;`
226			`}`
227			`}`
228
229			`static int __init do_reset(void)`
230			`{`
231			`while(count && *victim == '\0')`
232			`eat(1);`
233			`if (count && (this_header & 3))`
234			`error("broken padding");`
235			`return 1;`
236			`}`
237
238			`static int __init maybe_link(void)`
239			`{`
240			`if (nlink >= 2) {`
241			`char *old = find_link(major, minor, ino, mode, collected);`
242			`if (old)`
243			`return (sys_link(old, collected) < 0) ? -1 : 1;`
244			`}`
245			`return 0;`
246			`}`
247
248			`static void __init clean_path(char *path, mode_t mode)`
249			`{`
250			`struct stat st;`
251
252			`if (!sys_newlstat(path, &st) && (st.st_mode^mode) & S_IFMT) {`
253			`if (S_ISDIR(st.st_mode))`
254			`sys_rmdir(path);`
255			`else`
256			`sys_unlink(path);`
257			`}`
258			`}`
259
260			`static __initdata int wfd;`
261
262			`static int __init do_name(void)`
263			`{`
264			`state = SkipIt;`
265			`next_state = Reset;`
266			`if (strcmp(collected, "TRAILER!!!") == 0) {`
267			`free_hash();`
268			`return 0;`
269			`}`
270			`if (dry_run)`
271			`return 0;`
272			`clean_path(collected, mode);`
273			`if (S_ISREG(mode)) {`
274			`int ml = maybe_link();`
275			`if (ml >= 0) {`
276			`int openflags = O_WRONLY\|O_CREAT;`
277			`if (ml != 1)`
278			`openflags \|= O_TRUNC;`
279			`wfd = sys_open(collected, openflags, mode);`
280
281			`if (wfd >= 0) {`
282			`sys_fchown(wfd, uid, gid);`
283			`sys_fchmod(wfd, mode);`
284			`state = CopyFile;`
285			`}`
286			`}`
287			`} else if (S_ISDIR(mode)) {`
288			`sys_mkdir(collected, mode);`
289			`sys_chown(collected, uid, gid);`
290			`sys_chmod(collected, mode);`
291			`} else if (S_ISBLK(mode) \|\| S_ISCHR(mode) \|\|`
292			`S_ISFIFO(mode) \|\| S_ISSOCK(mode)) {`
293			`if (maybe_link() == 0) {`
294			`sys_mknod(collected, mode, rdev);`
295			`sys_chown(collected, uid, gid);`
296			`sys_chmod(collected, mode);`
297			`}`
298			`}`
299			`return 0;`
300			`}`
301
302			`static int __init do_copy(void)`
303			`{`
304			`if (count >= body_len) {`
305			`sys_write(wfd, victim, body_len);`
306			`sys_close(wfd);`
307			`eat(body_len);`
308			`state = SkipIt;`
309			`return 0;`
310			`} else {`
311			`sys_write(wfd, victim, count);`
312			`body_len -= count;`
313			`eat(count);`
314			`return 1;`
315			`}`
316			`}`
317
318			`static int __init do_symlink(void)`
319			`{`
320			`collected[N_ALIGN(name_len) + body_len] = '\0';`
321			`clean_path(collected, 0);`
322			`sys_symlink(collected + N_ALIGN(name_len), collected);`
323			`sys_lchown(collected, uid, gid);`
324			`state = SkipIt;`
325			`next_state = Reset;`
326			`return 0;`
327			`}`
328
329			`static __initdata int (*actions[])(void) = {`
330			`[Start] = do_start,`
331			`[Collect] = do_collect,`
332			`[GotHeader] = do_header,`
333			`[SkipIt] = do_skip,`
334			`[GotName] = do_name,`
335			`[CopyFile] = do_copy,`
336			`[GotSymlink] = do_symlink,`
337			`[Reset] = do_reset,`
338			`};`
339
340			`static int __init write_buffer(char *buf, unsigned len)`
341			`{`
342			`count = len;`
343			`victim = buf;`
344
345			`while (!actions[state]())`
346			`;`
347			`return len - count;`
348			`}`
349
350			`static void __init flush_buffer(char *buf, unsigned len)`
351			`{`
352			`int written;`
353			`if (message)`
354			`return;`
355			`while ((written = write_buffer(buf, len)) < len && !message) {`
356			`char c = buf[written];`
357			`if (c == '0') {`
358			`buf += written;`
359			`len -= written;`
360			`state = Start;`
361			`} else if (c == 0) {`
362			`buf += written;`
363			`len -= written;`
364			`state = Reset;`
365			`} else`
366			`error("junk in compressed archive");`
367			`}`
368			`}`
369
370			`/*`
371			`* gzip declarations`
372			`*/`
373
374			`#define OF(args) args`
375
376			`#ifndef memzero`
377			`#define memzero(s, n) memset ((s), 0, (n))`
378			`#endif`
379
380			`typedef unsigned char uch;`
381			`typedef unsigned short ush;`
382			`typedef unsigned long ulg;`
383
384			`#define WSIZE 0x8000 /* window size--must be a power of two, and */`
385			`/* at least 32K for zip's deflate method */`
386
387			`static uch *inbuf;`
388			`static uch *window;`
389
390			`static unsigned insize; /* valid bytes in inbuf */`
391			`static unsigned inptr; /* index of next byte to be processed in inbuf */`
392			`static unsigned outcnt; /* bytes in output buffer */`
393			`static long bytes_out;`
394
395			`#define get_byte() (inptr < insize ? inbuf[inptr++] : -1)`
396
397			`/* Diagnostic functions (stubbed out) */`
398			`#define Assert(cond,msg)`
399			`#define Trace(x)`
400			`#define Tracev(x)`
401			`#define Tracevv(x)`
402			`#define Tracec(c,x)`
403			`#define Tracecv(c,x)`
404
405			`#define STATIC static`
406			`#define INIT __init`
407
408			`static void __init flush_window(void);`
409			`static void __init error(char *m);`
410			`static void __init gzip_mark(void **);`
411			`static void __init gzip_release(void **);`
412
413			`#include "../lib/inflate.c"`
414
415			`static void __init gzip_mark(void **ptr)`
416			`{`
417			`}`
418
419			`static void __init gzip_release(void **ptr)`
420			`{`
421			`}`
422
423			`/* ===========================================================================`
424			`* Write the output window window[0..outcnt-1] and update crc and bytes_out.`
425			`* (Used for the decompressed data only.)`
426			`*/`
427			`static void __init flush_window(void)`
428			`{`
429			`ulg c = crc; /* temporary variable */`
430			`unsigned n;`
431			`uch *in, ch;`
432
433			`flush_buffer(window, outcnt);`
434			`in = window;`
435			`for (n = 0; n < outcnt; n++) {`
436			`ch = *in++;`
437			`c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);`
438			`}`
439			`crc = c;`
440			`bytes_out += (ulg)outcnt;`
441			`outcnt = 0;`
442			`}`
443
444			`static char * __init unpack_to_rootfs(char *buf, unsigned len, int check_only)`
445			`{`
446			`int written;`
447			`dry_run = check_only;`
448			`header_buf = malloc(110);`
449			`symlink_buf = malloc(PATH_MAX + N_ALIGN(PATH_MAX) + 1);`
450			`name_buf = malloc(N_ALIGN(PATH_MAX));`
451			`window = malloc(WSIZE);`
452			`if (!window \|\| !header_buf \|\| !symlink_buf \|\| !name_buf)`
453			`panic("can't allocate buffers");`
454			`state = Start;`
455			`this_header = 0;`
456			`message = NULL;`
457			`while (!message && len) {`
458			`loff_t saved_offset = this_header;`
459			`if (*buf == '0' && !(this_header & 3)) {`
460			`state = Start;`
461			`written = write_buffer(buf, len);`
462			`buf += written;`
463			`len -= written;`
464			`continue;`
465			`}`
466			`if (!*buf) {`
467			`buf++;`
468			`len--;`
469			`this_header++;`
470			`continue;`
471			`}`
472			`this_header = 0;`
473			`insize = len;`
474			`inbuf = buf;`
475			`inptr = 0;`
476			`outcnt = 0; /* bytes in output buffer */`
477			`bytes_out = 0;`
478			`crc = (ulg)0xffffffffL; /* shift register contents */`
479			`makecrc();`
480			`gunzip();`
481			`if (state != Reset)`
482			`error("junk in gzipped archive");`
483			`this_header = saved_offset + inptr;`
484			`buf += inptr;`
485			`len -= inptr;`
486			`}`
487			`free(window);`
488			`free(name_buf);`
489			`free(symlink_buf);`
490			`free(header_buf);`
491			`return message;`
492			`}`
493
494			`static int __initdata do_retain_initrd;`
495
496			`static int __init retain_initrd_param(char *str)`
497			`{`
498			`if (*str)`
499			`return 0;`
500			`do_retain_initrd = 1;`
501			`return 1;`
502			`}`
503			`__setup("retain_initrd", retain_initrd_param);`
504
505			`extern char __initramfs_start[], __initramfs_end[];`
506			`#ifdef CONFIG_BLK_DEV_INITRD`
507			`#include <linux/initrd.h>`
508			`#include <linux/kexec.h>`
509
510			`static void __init free_initrd(void)`
511			`{`
512			`#ifdef CONFIG_KEXEC`
513			`unsigned long crashk_start = (unsigned long)__va(crashk_res.start);`
514			`unsigned long crashk_end = (unsigned long)__va(crashk_res.end);`
515			`#endif`
516			`if (do_retain_initrd)`
517			`goto skip;`
518
519			`#ifdef CONFIG_KEXEC`
520			`/*`
521			`* If the initrd region is overlapped with crashkernel reserved region,`
522			`* free only memory that is not part of crashkernel region.`
523			`*/`
524			`if (initrd_start < crashk_end && initrd_end > crashk_start) {`
525			`/*`
526			`* Initialize initrd memory region since the kexec boot does`
527			`* not do.`
528			`*/`
529			`memset((void *)initrd_start, 0, initrd_end - initrd_start);`
530			`if (initrd_start < crashk_start)`
531			`free_initrd_mem(initrd_start, crashk_start);`
532			`if (initrd_end > crashk_end)`
533			`free_initrd_mem(crashk_end, initrd_end);`
534			`} else`
535			`#endif`
536			`free_initrd_mem(initrd_start, initrd_end);`
537			`skip:`
538			`initrd_start = 0;`
539			`initrd_end = 0;`
540			`}`
541
542			`#endif`
543
544			`static int __init populate_rootfs(void)`
545			`{`
546			`char *err = unpack_to_rootfs(__initramfs_start,`
547			`__initramfs_end - __initramfs_start, 0);`
548			`if (err)`
549			`panic(err);`
550			`#ifdef CONFIG_BLK_DEV_INITRD`
551			`if (initrd_start) {`
552			`#ifdef CONFIG_BLK_DEV_RAM`
553			`int fd;`
554			`printk(KERN_INFO "checking if image is initramfs...");`
555			`err = unpack_to_rootfs((char *)initrd_start,`
556			`initrd_end - initrd_start, 1);`
557			`if (!err) {`
558			`printk(" it is\n");`
559			`unpack_to_rootfs((char *)initrd_start,`
560			`initrd_end - initrd_start, 0);`
561			`free_initrd();`
562			`return 0;`
563			`}`
564			`printk("it isn't (%s); looks like an initrd\n", err);`
565			`fd = sys_open("/initrd.image", O_WRONLY\|O_CREAT, 0700);`
566			`if (fd >= 0) {`
567			`sys_write(fd, (char *)initrd_start,`
568			`initrd_end - initrd_start);`
569			`sys_close(fd);`
570			`free_initrd();`
571			`}`
572			`#else`
573			`printk(KERN_INFO "Unpacking initramfs...");`
574			`err = unpack_to_rootfs((char *)initrd_start,`
575			`initrd_end - initrd_start, 0);`
576			`if (err)`
577			`panic(err);`
578			`printk(" done\n");`
579			`free_initrd();`
580			`#endif`
581			`}`
582			`#endif`
583			`return 0;`
584			`}`
585			`rootfs_initcall(populate_rootfs);`