1 /*
2 * arch/sh/boot/compressed/misc_64.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 SHmedia from sh by Stuart Menefy, May 2002
10 */
11
12 #include <asm/uaccess.h>
13
14 /* cache.c */
15 #define CACHE_ENABLE 0
16 #define CACHE_DISABLE 1
17 int cache_control(unsigned int command);
18
19 /*
20 * gzip declarations
21 */
22
23 #define OF(args) args
24 #define STATIC static
25
26 #undef memset
27 #undef memcpy
28 #define memzero(s, n) memset ((s), 0, (n))
29
30 typedef unsigned char uch;
31 typedef unsigned short ush;
32 typedef unsigned long ulg;
33
34 #define WSIZE 0x8000 /* Window size must be at least 32k, */
35 /* and a power of two */
36
37 static uch *inbuf; /* input buffer */
38 static uch window[WSIZE]; /* Sliding window buffer */
39
40 static unsigned insize = 0; /* valid bytes in inbuf */
41 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
42 static unsigned outcnt = 0; /* bytes in output buffer */
43
44 /* gzip flag byte */
45 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
46 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
47 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
48 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
49 #define COMMENT 0x10 /* bit 4 set: file comment present */
50 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
51 #define RESERVED 0xC0 /* bit 6,7: reserved */
52
53 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
54
55 /* Diagnostic functions */
56 #ifdef DEBUG
57 # define Assert(cond,msg) {if(!(cond)) error(msg);}
58 # define Trace(x) fprintf x
59 # define Tracev(x) {if (verbose) fprintf x ;}
60 # define Tracevv(x) {if (verbose>1) fprintf x ;}
61 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
62 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
63 #else
64 # define Assert(cond,msg)
65 # define Trace(x)
66 # define Tracev(x)
67 # define Tracevv(x)
68 # define Tracec(c,x)
69 # define Tracecv(c,x)
70 #endif
71
72 static int fill_inbuf(void);
73 static void flush_window(void);
74 static void error(char *m);
75
76 extern char input_data[];
77 extern int input_len;
78
79 static long bytes_out = 0;
80 static uch *output_data;
81 static unsigned long output_ptr = 0;
82
83 static void error(char *m);
84
85 static void puts(const char *);
86
87 extern int _text; /* Defined in vmlinux.lds.S */
88 extern int _end;
89 static unsigned long free_mem_ptr;
90 static unsigned long free_mem_end_ptr;
91
92 #define HEAP_SIZE 0x10000
93
94 #include "../../../../lib/inflate.c"
95
puts(const char * s)96 void puts(const char *s)
97 {
98 }
99
memset(void * s,int c,size_t n)100 void *memset(void *s, int c, size_t n)
101 {
102 int i;
103 char *ss = (char *) s;
104
105 for (i = 0; i < n; i++)
106 ss[i] = c;
107 return s;
108 }
109
memcpy(void * __dest,__const void * __src,size_t __n)110 void *memcpy(void *__dest, __const void *__src, size_t __n)
111 {
112 int i;
113 char *d = (char *) __dest, *s = (char *) __src;
114
115 for (i = 0; i < __n; i++)
116 d[i] = s[i];
117 return __dest;
118 }
119
120 /* ===========================================================================
121 * Fill the input buffer. This is called only when the buffer is empty
122 * and at least one byte is really needed.
123 */
fill_inbuf(void)124 static int fill_inbuf(void)
125 {
126 if (insize != 0) {
127 error("ran out of input data\n");
128 }
129
130 inbuf = input_data;
131 insize = input_len;
132 inptr = 1;
133 return inbuf[0];
134 }
135
136 /* ===========================================================================
137 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
138 * (Used for the decompressed data only.)
139 */
flush_window(void)140 static void flush_window(void)
141 {
142 ulg c = crc; /* temporary variable */
143 unsigned n;
144 uch *in, *out, ch;
145
146 in = window;
147 out = &output_data[output_ptr];
148 for (n = 0; n < outcnt; n++) {
149 ch = *out++ = *in++;
150 c = crc_32_tab[((int) c ^ ch) & 0xff] ^ (c >> 8);
151 }
152 crc = c;
153 bytes_out += (ulg) outcnt;
154 output_ptr += (ulg) outcnt;
155 outcnt = 0;
156 puts(".");
157 }
158
error(char * x)159 static void error(char *x)
160 {
161 puts("\n\n");
162 puts(x);
163 puts("\n\n -- System halted");
164
165 while (1) ; /* Halt */
166 }
167
168 #define STACK_SIZE (4096)
169 long __attribute__ ((aligned(8))) user_stack[STACK_SIZE];
170 long *stack_start = &user_stack[STACK_SIZE];
171
decompress_kernel(void)172 void decompress_kernel(void)
173 {
174 output_data = (uch *) (CONFIG_MEMORY_START + 0x2000);
175 free_mem_ptr = (unsigned long) &_end;
176 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
177
178 makecrc();
179 puts("Uncompressing Linux... ");
180 cache_control(CACHE_ENABLE);
181 gunzip();
182 puts("\n");
183
184 #if 0
185 /* When booting from ROM may want to do something like this if the
186 * boot loader doesn't.
187 */
188
189 /* Set up the parameters and command line */
190 {
191 volatile unsigned int *parambase =
192 (int *) (CONFIG_MEMORY_START + 0x1000);
193
194 parambase[0] = 0x1; /* MOUNT_ROOT_RDONLY */
195 parambase[1] = 0x0; /* RAMDISK_FLAGS */
196 parambase[2] = 0x0200; /* ORIG_ROOT_DEV */
197 parambase[3] = 0x0; /* LOADER_TYPE */
198 parambase[4] = 0x0; /* INITRD_START */
199 parambase[5] = 0x0; /* INITRD_SIZE */
200 parambase[6] = 0;
201
202 strcpy((char *) ((int) parambase + 0x100),
203 "console=ttySC0,38400");
204 }
205 #endif
206
207 puts("Ok, booting the kernel.\n");
208
209 cache_control(CACHE_DISABLE);
210 }
211