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 <asm/uaccess.h>
15 #include <asm/addrspace.h>
16 #include <asm/page.h>
17 #ifdef CONFIG_SH_STANDARD_BIOS
18 #include <asm/sh_bios.h>
19 #endif
20
21 /*
22 * gzip declarations
23 */
24
25 #define OF(args) args
26 #define STATIC static
27
28 #undef memset
29 #undef memcpy
30 #define memzero(s, n) memset ((s), 0, (n))
31
32 typedef unsigned char uch;
33 typedef unsigned short ush;
34 typedef unsigned long ulg;
35
36 #define WSIZE 0x8000 /* Window size must be at least 32k, */
37 /* and a power of two */
38
39 static uch *inbuf; /* input buffer */
40 static uch window[WSIZE]; /* Sliding window buffer */
41
42 static unsigned insize = 0; /* valid bytes in inbuf */
43 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
44 static unsigned outcnt = 0; /* bytes in output buffer */
45
46 /* gzip flag byte */
47 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
48 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
49 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
50 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
51 #define COMMENT 0x10 /* bit 4 set: file comment present */
52 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
53 #define RESERVED 0xC0 /* bit 6,7: reserved */
54
55 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
56
57 /* Diagnostic functions */
58 #ifdef DEBUG
59 # define Assert(cond,msg) {if(!(cond)) error(msg);}
60 # define Trace(x) fprintf x
61 # define Tracev(x) {if (verbose) fprintf x ;}
62 # define Tracevv(x) {if (verbose>1) fprintf x ;}
63 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
64 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
65 #else
66 # define Assert(cond,msg)
67 # define Trace(x)
68 # define Tracev(x)
69 # define Tracevv(x)
70 # define Tracec(c,x)
71 # define Tracecv(c,x)
72 #endif
73
74 static int fill_inbuf(void);
75 static void flush_window(void);
76 static void error(char *m);
77
78 extern char input_data[];
79 extern int input_len;
80
81 static long bytes_out = 0;
82 static uch *output_data;
83 static unsigned long output_ptr = 0;
84
85 static void error(char *m);
86
87 int puts(const char *);
88
89 extern int _text; /* Defined in vmlinux.lds.S */
90 extern int _end;
91 static unsigned long free_mem_ptr;
92 static unsigned long free_mem_end_ptr;
93
94 #define HEAP_SIZE 0x10000
95
96 #include "../../../../lib/inflate.c"
97
98 #ifdef CONFIG_SH_STANDARD_BIOS
strlen(const char * s)99 size_t strlen(const char *s)
100 {
101 int i = 0;
102
103 while (*s++)
104 i++;
105 return i;
106 }
107
puts(const char * s)108 int puts(const char *s)
109 {
110 int len = strlen(s);
111 sh_bios_console_write(s, len);
112 return len;
113 }
114 #else
puts(const char * s)115 int puts(const char *s)
116 {
117 /* This should be updated to use the sh-sci routines */
118 return 0;
119 }
120 #endif
121
memset(void * s,int c,size_t n)122 void* memset(void* s, int c, size_t n)
123 {
124 int i;
125 char *ss = (char*)s;
126
127 for (i=0;i<n;i++) ss[i] = c;
128 return s;
129 }
130
memcpy(void * __dest,__const void * __src,size_t __n)131 void* memcpy(void* __dest, __const void* __src,
132 size_t __n)
133 {
134 int i;
135 char *d = (char *)__dest, *s = (char *)__src;
136
137 for (i=0;i<__n;i++) d[i] = s[i];
138 return __dest;
139 }
140
141 /* ===========================================================================
142 * Fill the input buffer. This is called only when the buffer is empty
143 * and at least one byte is really needed.
144 */
fill_inbuf(void)145 static int fill_inbuf(void)
146 {
147 if (insize != 0) {
148 error("ran out of input data");
149 }
150
151 inbuf = input_data;
152 insize = input_len;
153 inptr = 1;
154 return inbuf[0];
155 }
156
157 /* ===========================================================================
158 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
159 * (Used for the decompressed data only.)
160 */
flush_window(void)161 static void flush_window(void)
162 {
163 ulg c = crc; /* temporary variable */
164 unsigned n;
165 uch *in, *out, ch;
166
167 in = window;
168 out = &output_data[output_ptr];
169 for (n = 0; n < outcnt; n++) {
170 ch = *out++ = *in++;
171 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
172 }
173 crc = c;
174 bytes_out += (ulg)outcnt;
175 output_ptr += (ulg)outcnt;
176 outcnt = 0;
177 }
178
error(char * x)179 static void error(char *x)
180 {
181 puts("\n\n");
182 puts(x);
183 puts("\n\n -- System halted");
184
185 while(1); /* Halt */
186 }
187
188 #define STACK_SIZE (4096)
189 long user_stack [STACK_SIZE];
190 long* stack_start = &user_stack[STACK_SIZE];
191
decompress_kernel(void)192 void decompress_kernel(void)
193 {
194 output_data = NULL;
195 output_ptr = PHYSADDR((unsigned long)&_text+PAGE_SIZE);
196 #ifdef CONFIG_29BIT
197 output_ptr |= P2SEG;
198 #endif
199 free_mem_ptr = (unsigned long)&_end;
200 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
201
202 makecrc();
203 puts("Uncompressing Linux... ");
204 gunzip();
205 puts("Ok, booting the kernel.\n");
206 }
207