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 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
9 * adaptation for Linux/CRIS Axis Communications AB, 1999
10 *
11 */
12
13 /* where the piggybacked kernel image expects itself to live.
14 * it is the same address we use when we network load an uncompressed
15 * image into DRAM, and it is the address the kernel is linked to live
16 * at by vmlinux.lds.S
17 */
18
19 #define KERNEL_LOAD_ADR 0x40004000
20
21
22 #include <linux/types.h>
23 #include <arch/svinto.h>
24
25 /*
26 * gzip declarations
27 */
28
29 #define OF(args) args
30 #define STATIC static
31
32 void *memset(void *s, int c, size_t n);
33 void *memcpy(void *__dest, __const void *__src, size_t __n);
34
35 #define memzero(s, n) memset((s), 0, (n))
36
37 typedef unsigned char uch;
38 typedef unsigned short ush;
39 typedef unsigned long ulg;
40
41 #define WSIZE 0x8000 /* Window size must be at least 32k, */
42 /* and a power of two */
43
44 static uch *inbuf; /* input buffer */
45 static uch window[WSIZE]; /* Sliding window buffer */
46
47 unsigned inptr = 0; /* index of next byte to be processed in inbuf
48 * After decompression it will contain the
49 * compressed size, and head.S will read it.
50 */
51
52 static unsigned outcnt = 0; /* bytes in output buffer */
53
54 /* gzip flag byte */
55 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
56 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
57 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
58 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
59 #define COMMENT 0x10 /* bit 4 set: file comment present */
60 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
61 #define RESERVED 0xC0 /* bit 6,7: reserved */
62
63 #define get_byte() (inbuf[inptr++])
64
65 /* Diagnostic functions */
66 #ifdef DEBUG
67 # define Assert(cond, msg) do { \
68 if (!(cond)) \
69 error(msg); \
70 } while (0)
71 # define Trace(x) fprintf x
72 # define Tracev(x) do { \
73 if (verbose) \
74 fprintf x; \
75 } while (0)
76 # define Tracevv(x) do { \
77 if (verbose > 1) \
78 fprintf x; \
79 } while (0)
80 # define Tracec(c, x) do { \
81 if (verbose && (c)) \
82 fprintf x; \
83 } while (0)
84 # define Tracecv(c, x) do { \
85 if (verbose > 1 && (c)) \
86 fprintf x; \
87 } while (0)
88 #else
89 # define Assert(cond, msg)
90 # define Trace(x)
91 # define Tracev(x)
92 # define Tracevv(x)
93 # define Tracec(c, x)
94 # define Tracecv(c, x)
95 #endif
96
97 static void flush_window(void);
98 static void error(char *m);
99
100 extern char *input_data; /* lives in head.S */
101
102 static long bytes_out = 0;
103 static uch *output_data;
104 static unsigned long output_ptr = 0;
105 static void puts(const char *);
106
107 /* the "heap" is put directly after the BSS ends, at end */
108
109 extern int _end;
110 static long free_mem_ptr = (long)&_end;
111 static long free_mem_end_ptr;
112
113 #include "../../../../../lib/inflate.c"
114
115 /* decompressor info and error messages to serial console */
116
117 static void
puts(const char * s)118 puts(const char *s)
119 {
120 #ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
121 while (*s) {
122 #ifdef CONFIG_ETRAX_DEBUG_PORT0
123 while (!(*R_SERIAL0_STATUS & (1 << 5))) ;
124 *R_SERIAL0_TR_DATA = *s++;
125 #endif
126 #ifdef CONFIG_ETRAX_DEBUG_PORT1
127 while (!(*R_SERIAL1_STATUS & (1 << 5))) ;
128 *R_SERIAL1_TR_DATA = *s++;
129 #endif
130 #ifdef CONFIG_ETRAX_DEBUG_PORT2
131 while (!(*R_SERIAL2_STATUS & (1 << 5))) ;
132 *R_SERIAL2_TR_DATA = *s++;
133 #endif
134 #ifdef CONFIG_ETRAX_DEBUG_PORT3
135 while (!(*R_SERIAL3_STATUS & (1 << 5))) ;
136 *R_SERIAL3_TR_DATA = *s++;
137 #endif
138 }
139 #endif
140 }
141
memset(void * s,int c,size_t n)142 void *memset(void *s, int c, size_t n)
143 {
144 int i;
145 char *ss = (char *)s;
146
147 for (i = 0; i < n; i++)
148 ss[i] = c;
149
150 return s;
151 }
152
memcpy(void * __dest,__const void * __src,size_t __n)153 void *memcpy(void *__dest, __const void *__src, size_t __n)
154 {
155 int i;
156 char *d = (char *)__dest, *s = (char *)__src;
157
158 for (i = 0; i < __n; i++)
159 d[i] = s[i];
160
161 return __dest;
162 }
163
164 /* ===========================================================================
165 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
166 * (Used for the decompressed data only.)
167 */
168
flush_window(void)169 static void flush_window(void)
170 {
171 ulg c = crc; /* temporary variable */
172 unsigned n;
173 uch *in, *out, ch;
174
175 in = window;
176 out = &output_data[output_ptr];
177 for (n = 0; n < outcnt; n++) {
178 ch = *out = *in;
179 out++;
180 in++;
181 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
182 }
183 crc = c;
184 bytes_out += (ulg)outcnt;
185 output_ptr += (ulg)outcnt;
186 outcnt = 0;
187 }
188
error(char * x)189 static void error(char *x)
190 {
191 puts("\n\n");
192 puts(x);
193 puts("\n\n -- System halted\n");
194
195 while (1); /* Halt */
196 }
197
setup_normal_output_buffer(void)198 void setup_normal_output_buffer(void)
199 {
200 output_data = (char *)KERNEL_LOAD_ADR;
201 }
202
decompress_kernel(void)203 void decompress_kernel(void)
204 {
205 char revision;
206
207 /* input_data is set in head.S */
208 inbuf = input_data;
209
210 #ifdef CONFIG_ETRAX_DEBUG_PORT0
211 *R_SERIAL0_XOFF = 0;
212 *R_SERIAL0_BAUD = 0x99;
213 *R_SERIAL0_TR_CTRL = 0x40;
214 #endif
215 #ifdef CONFIG_ETRAX_DEBUG_PORT1
216 *R_SERIAL1_XOFF = 0;
217 *R_SERIAL1_BAUD = 0x99;
218 *R_SERIAL1_TR_CTRL = 0x40;
219 #endif
220 #ifdef CONFIG_ETRAX_DEBUG_PORT2
221 *R_GEN_CONFIG = 0x08;
222 *R_SERIAL2_XOFF = 0;
223 *R_SERIAL2_BAUD = 0x99;
224 *R_SERIAL2_TR_CTRL = 0x40;
225 #endif
226 #ifdef CONFIG_ETRAX_DEBUG_PORT3
227 *R_GEN_CONFIG = 0x100;
228 *R_SERIAL3_XOFF = 0;
229 *R_SERIAL3_BAUD = 0x99;
230 *R_SERIAL3_TR_CTRL = 0x40;
231 #endif
232
233 setup_normal_output_buffer();
234
235 makecrc();
236
237 __asm__ volatile ("move $vr,%0" : "=rm" (revision));
238 if (revision < 10) {
239 puts("You need an ETRAX 100LX to run linux 2.6\n");
240 while (1);
241 }
242
243 puts("Uncompressing Linux...\n");
244 gunzip();
245 puts("Done. Now booting the kernel.\n");
246 }
247