ia64/linux-2.6.18-xen.hg

view arch/alpha/boot/misc.c @ 647:a5bb490065f6

Fix the build after public header sync.
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Wed Aug 13 14:01:49 2008 +0100 (2008-08-13)
parents 831230e53067
children
line source
1 /*
2 * misc.c
3 *
4 * This is a collection of several routines from gzip-1.0.3
5 * adapted for Linux.
6 *
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
8 *
9 * Modified for ARM Linux by Russell King
10 *
11 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
12 * For this code to run directly from Flash, all constant variables must
13 * be marked with 'const' and all other variables initialized at run-time
14 * only. This way all non constant variables will end up in the bss segment,
15 * which should point to addresses in RAM and cleared to 0 on start.
16 * This allows for a much quicker boot time.
17 *
18 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
19 */
21 #include <linux/kernel.h>
23 #include <asm/uaccess.h>
25 #define memzero(s,n) memset ((s),0,(n))
26 #define puts srm_printk
27 extern long srm_printk(const char *, ...)
28 __attribute__ ((format (printf, 1, 2)));
30 /*
31 * gzip delarations
32 */
33 #define OF(args) args
34 #define STATIC static
36 typedef unsigned char uch;
37 typedef unsigned short ush;
38 typedef unsigned long ulg;
40 #define WSIZE 0x8000 /* Window size must be at least 32k, */
41 /* and a power of two */
43 static uch *inbuf; /* input buffer */
44 static uch *window; /* Sliding window buffer */
46 static unsigned insize; /* valid bytes in inbuf */
47 static unsigned inptr; /* index of next byte to be processed in inbuf */
48 static unsigned outcnt; /* bytes in output buffer */
50 /* gzip flag byte */
51 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
52 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
53 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
54 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
55 #define COMMENT 0x10 /* bit 4 set: file comment present */
56 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
57 #define RESERVED 0xC0 /* bit 6,7: reserved */
59 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
61 /* Diagnostic functions */
62 #ifdef DEBUG
63 # define Assert(cond,msg) {if(!(cond)) error(msg);}
64 # define Trace(x) fprintf x
65 # define Tracev(x) {if (verbose) fprintf x ;}
66 # define Tracevv(x) {if (verbose>1) fprintf x ;}
67 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
68 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
69 #else
70 # define Assert(cond,msg)
71 # define Trace(x)
72 # define Tracev(x)
73 # define Tracevv(x)
74 # define Tracec(c,x)
75 # define Tracecv(c,x)
76 #endif
78 static int fill_inbuf(void);
79 static void flush_window(void);
80 static void error(char *m);
81 static void gzip_mark(void **);
82 static void gzip_release(void **);
84 static char *input_data;
85 static int input_data_size;
87 static uch *output_data;
88 static ulg output_ptr;
89 static ulg bytes_out;
91 static void *malloc(int size);
92 static void free(void *where);
93 static void error(char *m);
94 static void gzip_mark(void **);
95 static void gzip_release(void **);
97 extern int end;
98 static ulg free_mem_ptr;
99 static ulg free_mem_ptr_end;
101 #define HEAP_SIZE 0x2000
103 #include "../../../lib/inflate.c"
105 static void *malloc(int size)
106 {
107 void *p;
109 if (size <0) error("Malloc error");
110 if (free_mem_ptr <= 0) error("Memory error");
112 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
114 p = (void *)free_mem_ptr;
115 free_mem_ptr += size;
117 if (free_mem_ptr >= free_mem_ptr_end)
118 error("Out of memory");
119 return p;
120 }
122 static void free(void *where)
123 { /* gzip_mark & gzip_release do the free */
124 }
126 static void gzip_mark(void **ptr)
127 {
128 *ptr = (void *) free_mem_ptr;
129 }
131 static void gzip_release(void **ptr)
132 {
133 free_mem_ptr = (long) *ptr;
134 }
136 /* ===========================================================================
137 * Fill the input buffer. This is called only when the buffer is empty
138 * and at least one byte is really needed.
139 */
140 int fill_inbuf(void)
141 {
142 if (insize != 0)
143 error("ran out of input data");
145 inbuf = input_data;
146 insize = input_data_size;
148 inptr = 1;
149 return inbuf[0];
150 }
152 /* ===========================================================================
153 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
154 * (Used for the decompressed data only.)
155 */
156 void flush_window(void)
157 {
158 ulg c = crc;
159 unsigned n;
160 uch *in, *out, ch;
162 in = window;
163 out = &output_data[output_ptr];
164 for (n = 0; n < outcnt; n++) {
165 ch = *out++ = *in++;
166 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
167 }
168 crc = c;
169 bytes_out += (ulg)outcnt;
170 output_ptr += (ulg)outcnt;
171 outcnt = 0;
172 /* puts("."); */
173 }
175 static void error(char *x)
176 {
177 puts("\n\n");
178 puts(x);
179 puts("\n\n -- System halted");
181 while(1); /* Halt */
182 }
184 unsigned int
185 decompress_kernel(void *output_start,
186 void *input_start,
187 size_t ksize,
188 size_t kzsize)
189 {
190 output_data = (uch *)output_start;
191 input_data = (uch *)input_start;
192 input_data_size = kzsize; /* use compressed size */
194 /* FIXME FIXME FIXME */
195 free_mem_ptr = (ulg)output_start + ksize;
196 free_mem_ptr_end = (ulg)output_start + ksize + 0x200000;
197 /* FIXME FIXME FIXME */
199 /* put in temp area to reduce initial footprint */
200 window = malloc(WSIZE);
202 makecrc();
203 /* puts("Uncompressing Linux..."); */
204 gunzip();
205 /* puts(" done, booting the kernel.\n"); */
206 return output_ptr;
207 }