aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sh/boot/compressed/misc.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/sh/boot/compressed/misc.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/sh/boot/compressed/misc.c')
-rw-r--r--arch/sh/boot/compressed/misc.c240
1 files changed, 240 insertions, 0 deletions
diff --git a/arch/sh/boot/compressed/misc.c b/arch/sh/boot/compressed/misc.c
new file mode 100644
index 000000000000..211e9110074f
--- /dev/null
+++ b/arch/sh/boot/compressed/misc.c
@@ -0,0 +1,240 @@
1/*
2 * arch/sh/boot/compressed/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 * Adapted for SH by Stuart Menefy, Aug 1999
10 *
11 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
12 */
13
14#include <linux/config.h>
15#include <asm/uaccess.h>
16#ifdef CONFIG_SH_STANDARD_BIOS
17#include <asm/sh_bios.h>
18#endif
19
20/*
21 * gzip declarations
22 */
23
24#define OF(args) args
25#define STATIC static
26
27#undef memset
28#undef memcpy
29#define memzero(s, n) memset ((s), 0, (n))
30
31typedef unsigned char uch;
32typedef unsigned short ush;
33typedef unsigned long ulg;
34
35#define WSIZE 0x8000 /* Window size must be at least 32k, */
36 /* and a power of two */
37
38static uch *inbuf; /* input buffer */
39static uch window[WSIZE]; /* Sliding window buffer */
40
41static unsigned insize = 0; /* valid bytes in inbuf */
42static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
43static unsigned outcnt = 0; /* bytes in output buffer */
44
45/* gzip flag byte */
46#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
47#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
48#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
49#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
50#define COMMENT 0x10 /* bit 4 set: file comment present */
51#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
52#define RESERVED 0xC0 /* bit 6,7: reserved */
53
54#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
55
56/* Diagnostic functions */
57#ifdef DEBUG
58# define Assert(cond,msg) {if(!(cond)) error(msg);}
59# define Trace(x) fprintf x
60# define Tracev(x) {if (verbose) fprintf x ;}
61# define Tracevv(x) {if (verbose>1) fprintf x ;}
62# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
63# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
64#else
65# define Assert(cond,msg)
66# define Trace(x)
67# define Tracev(x)
68# define Tracevv(x)
69# define Tracec(c,x)
70# define Tracecv(c,x)
71#endif
72
73static int fill_inbuf(void);
74static void flush_window(void);
75static void error(char *m);
76static void gzip_mark(void **);
77static void gzip_release(void **);
78
79extern char input_data[];
80extern int input_len;
81
82static long bytes_out = 0;
83static uch *output_data;
84static unsigned long output_ptr = 0;
85
86static void *malloc(int size);
87static void free(void *where);
88static void error(char *m);
89static void gzip_mark(void **);
90static void gzip_release(void **);
91
92int puts(const char *);
93
94extern int _text; /* Defined in vmlinux.lds.S */
95extern int _end;
96static unsigned long free_mem_ptr;
97static unsigned long free_mem_end_ptr;
98
99#define HEAP_SIZE 0x10000
100
101#include "../../../../lib/inflate.c"
102
103static void *malloc(int size)
104{
105 void *p;
106
107 if (size <0) error("Malloc error");
108 if (free_mem_ptr == 0) error("Memory error");
109
110 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
111
112 p = (void *)free_mem_ptr;
113 free_mem_ptr += size;
114
115 if (free_mem_ptr >= free_mem_end_ptr)
116 error("Out of memory");
117
118 return p;
119}
120
121static void free(void *where)
122{ /* Don't care */
123}
124
125static void gzip_mark(void **ptr)
126{
127 *ptr = (void *) free_mem_ptr;
128}
129
130static void gzip_release(void **ptr)
131{
132 free_mem_ptr = (long) *ptr;
133}
134
135#ifdef CONFIG_SH_STANDARD_BIOS
136size_t strlen(const char *s)
137{
138 int i = 0;
139
140 while (*s++)
141 i++;
142 return i;
143}
144
145int puts(const char *s)
146{
147 int len = strlen(s);
148 sh_bios_console_write(s, len);
149 return len;
150}
151#else
152int puts(const char *s)
153{
154 /* This should be updated to use the sh-sci routines */
155 return 0;
156}
157#endif
158
159void* memset(void* s, int c, size_t n)
160{
161 int i;
162 char *ss = (char*)s;
163
164 for (i=0;i<n;i++) ss[i] = c;
165 return s;
166}
167
168void* memcpy(void* __dest, __const void* __src,
169 size_t __n)
170{
171 int i;
172 char *d = (char *)__dest, *s = (char *)__src;
173
174 for (i=0;i<__n;i++) d[i] = s[i];
175 return __dest;
176}
177
178/* ===========================================================================
179 * Fill the input buffer. This is called only when the buffer is empty
180 * and at least one byte is really needed.
181 */
182static int fill_inbuf(void)
183{
184 if (insize != 0) {
185 error("ran out of input data");
186 }
187
188 inbuf = input_data;
189 insize = input_len;
190 inptr = 1;
191 return inbuf[0];
192}
193
194/* ===========================================================================
195 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
196 * (Used for the decompressed data only.)
197 */
198static void flush_window(void)
199{
200 ulg c = crc; /* temporary variable */
201 unsigned n;
202 uch *in, *out, ch;
203
204 in = window;
205 out = &output_data[output_ptr];
206 for (n = 0; n < outcnt; n++) {
207 ch = *out++ = *in++;
208 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
209 }
210 crc = c;
211 bytes_out += (ulg)outcnt;
212 output_ptr += (ulg)outcnt;
213 outcnt = 0;
214}
215
216static void error(char *x)
217{
218 puts("\n\n");
219 puts(x);
220 puts("\n\n -- System halted");
221
222 while(1); /* Halt */
223}
224
225#define STACK_SIZE (4096)
226long user_stack [STACK_SIZE];
227long* stack_start = &user_stack[STACK_SIZE];
228
229void decompress_kernel(void)
230{
231 output_data = 0;
232 output_ptr = (unsigned long)&_text+0x20001000;
233 free_mem_ptr = (unsigned long)&_end;
234 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
235
236 makecrc();
237 puts("Uncompressing Linux... ");
238 gunzip();
239 puts("Ok, booting the kernel.\n");
240}