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-rw-r--r--arch/i386/boot/compressed/misc.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/arch/i386/boot/compressed/misc.c b/arch/i386/boot/compressed/misc.c
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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 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
10 */
11
12#include <linux/linkage.h>
13#include <linux/vmalloc.h>
14#include <linux/tty.h>
15#include <video/edid.h>
16#include <asm/io.h>
17
18/*
19 * gzip declarations
20 */
21
22#define OF(args) args
23#define STATIC static
24
25#undef memset
26#undef memcpy
27
28/*
29 * Why do we do this? Don't ask me..
30 *
31 * Incomprehensible are the ways of bootloaders.
32 */
33static void* memset(void *, int, size_t);
34static void* memcpy(void *, __const void *, size_t);
35#define memzero(s, n) memset ((s), 0, (n))
36
37typedef unsigned char uch;
38typedef unsigned short ush;
39typedef unsigned long ulg;
40
41#define WSIZE 0x8000 /* Window size must be at least 32k, */
42 /* and a power of two */
43
44static uch *inbuf; /* input buffer */
45static uch window[WSIZE]; /* Sliding window buffer */
46
47static unsigned insize = 0; /* valid bytes in inbuf */
48static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
49static unsigned outcnt = 0; /* bytes in output buffer */
50
51/* gzip flag byte */
52#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
53#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
54#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
55#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
56#define COMMENT 0x10 /* bit 4 set: file comment present */
57#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
58#define RESERVED 0xC0 /* bit 6,7: reserved */
59
60#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
61
62/* Diagnostic functions */
63#ifdef DEBUG
64# define Assert(cond,msg) {if(!(cond)) error(msg);}
65# define Trace(x) fprintf x
66# define Tracev(x) {if (verbose) fprintf x ;}
67# define Tracevv(x) {if (verbose>1) fprintf x ;}
68# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
69# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
70#else
71# define Assert(cond,msg)
72# define Trace(x)
73# define Tracev(x)
74# define Tracevv(x)
75# define Tracec(c,x)
76# define Tracecv(c,x)
77#endif
78
79static int fill_inbuf(void);
80static void flush_window(void);
81static void error(char *m);
82static void gzip_mark(void **);
83static void gzip_release(void **);
84
85/*
86 * This is set up by the setup-routine at boot-time
87 */
88static unsigned char *real_mode; /* Pointer to real-mode data */
89
90#define RM_EXT_MEM_K (*(unsigned short *)(real_mode + 0x2))
91#ifndef STANDARD_MEMORY_BIOS_CALL
92#define RM_ALT_MEM_K (*(unsigned long *)(real_mode + 0x1e0))
93#endif
94#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
95
96extern char input_data[];
97extern int input_len;
98
99static long bytes_out = 0;
100static uch *output_data;
101static unsigned long output_ptr = 0;
102
103static void *malloc(int size);
104static void free(void *where);
105
106static void putstr(const char *);
107
108extern int end;
109static long free_mem_ptr = (long)&end;
110static long free_mem_end_ptr;
111
112#define INPLACE_MOVE_ROUTINE 0x1000
113#define LOW_BUFFER_START 0x2000
114#define LOW_BUFFER_MAX 0x90000
115#define HEAP_SIZE 0x3000
116static unsigned int low_buffer_end, low_buffer_size;
117static int high_loaded =0;
118static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;
119
120static char *vidmem = (char *)0xb8000;
121static int vidport;
122static int lines, cols;
123
124#ifdef CONFIG_X86_NUMAQ
125static void * xquad_portio = NULL;
126#endif
127
128#include "../../../../lib/inflate.c"
129
130static void *malloc(int size)
131{
132 void *p;
133
134 if (size <0) error("Malloc error");
135 if (free_mem_ptr <= 0) error("Memory error");
136
137 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
138
139 p = (void *)free_mem_ptr;
140 free_mem_ptr += size;
141
142 if (free_mem_ptr >= free_mem_end_ptr)
143 error("Out of memory");
144
145 return p;
146}
147
148static void free(void *where)
149{ /* Don't care */
150}
151
152static void gzip_mark(void **ptr)
153{
154 *ptr = (void *) free_mem_ptr;
155}
156
157static void gzip_release(void **ptr)
158{
159 free_mem_ptr = (long) *ptr;
160}
161
162static void scroll(void)
163{
164 int i;
165
166 memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
167 for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
168 vidmem[i] = ' ';
169}
170
171static void putstr(const char *s)
172{
173 int x,y,pos;
174 char c;
175
176 x = RM_SCREEN_INFO.orig_x;
177 y = RM_SCREEN_INFO.orig_y;
178
179 while ( ( c = *s++ ) != '\0' ) {
180 if ( c == '\n' ) {
181 x = 0;
182 if ( ++y >= lines ) {
183 scroll();
184 y--;
185 }
186 } else {
187 vidmem [ ( x + cols * y ) * 2 ] = c;
188 if ( ++x >= cols ) {
189 x = 0;
190 if ( ++y >= lines ) {
191 scroll();
192 y--;
193 }
194 }
195 }
196 }
197
198 RM_SCREEN_INFO.orig_x = x;
199 RM_SCREEN_INFO.orig_y = y;
200
201 pos = (x + cols * y) * 2; /* Update cursor position */
202 outb_p(14, vidport);
203 outb_p(0xff & (pos >> 9), vidport+1);
204 outb_p(15, vidport);
205 outb_p(0xff & (pos >> 1), vidport+1);
206}
207
208static void* memset(void* s, int c, size_t n)
209{
210 int i;
211 char *ss = (char*)s;
212
213 for (i=0;i<n;i++) ss[i] = c;
214 return s;
215}
216
217static void* memcpy(void* __dest, __const void* __src,
218 size_t __n)
219{
220 int i;
221 char *d = (char *)__dest, *s = (char *)__src;
222
223 for (i=0;i<__n;i++) d[i] = s[i];
224 return __dest;
225}
226
227/* ===========================================================================
228 * Fill the input buffer. This is called only when the buffer is empty
229 * and at least one byte is really needed.
230 */
231static int fill_inbuf(void)
232{
233 if (insize != 0) {
234 error("ran out of input data");
235 }
236
237 inbuf = input_data;
238 insize = input_len;
239 inptr = 1;
240 return inbuf[0];
241}
242
243/* ===========================================================================
244 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
245 * (Used for the decompressed data only.)
246 */
247static void flush_window_low(void)
248{
249 ulg c = crc; /* temporary variable */
250 unsigned n;
251 uch *in, *out, ch;
252
253 in = window;
254 out = &output_data[output_ptr];
255 for (n = 0; n < outcnt; n++) {
256 ch = *out++ = *in++;
257 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
258 }
259 crc = c;
260 bytes_out += (ulg)outcnt;
261 output_ptr += (ulg)outcnt;
262 outcnt = 0;
263}
264
265static void flush_window_high(void)
266{
267 ulg c = crc; /* temporary variable */
268 unsigned n;
269 uch *in, ch;
270 in = window;
271 for (n = 0; n < outcnt; n++) {
272 ch = *output_data++ = *in++;
273 if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
274 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
275 }
276 crc = c;
277 bytes_out += (ulg)outcnt;
278 outcnt = 0;
279}
280
281static void flush_window(void)
282{
283 if (high_loaded) flush_window_high();
284 else flush_window_low();
285}
286
287static void error(char *x)
288{
289 putstr("\n\n");
290 putstr(x);
291 putstr("\n\n -- System halted");
292
293 while(1); /* Halt */
294}
295
296#define STACK_SIZE (4096)
297
298long user_stack [STACK_SIZE];
299
300struct {
301 long * a;
302 short b;
303 } stack_start = { & user_stack [STACK_SIZE] , __BOOT_DS };
304
305static void setup_normal_output_buffer(void)
306{
307#ifdef STANDARD_MEMORY_BIOS_CALL
308 if (RM_EXT_MEM_K < 1024) error("Less than 2MB of memory");
309#else
310 if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
311#endif
312 output_data = (char *)0x100000; /* Points to 1M */
313 free_mem_end_ptr = (long)real_mode;
314}
315
316struct moveparams {
317 uch *low_buffer_start; int lcount;
318 uch *high_buffer_start; int hcount;
319};
320
321static void setup_output_buffer_if_we_run_high(struct moveparams *mv)
322{
323 high_buffer_start = (uch *)(((ulg)&end) + HEAP_SIZE);
324#ifdef STANDARD_MEMORY_BIOS_CALL
325 if (RM_EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
326#else
327 if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) <
328 (3*1024))
329 error("Less than 4MB of memory");
330#endif
331 mv->low_buffer_start = output_data = (char *)LOW_BUFFER_START;
332 low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX
333 ? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;
334 low_buffer_size = low_buffer_end - LOW_BUFFER_START;
335 high_loaded = 1;
336 free_mem_end_ptr = (long)high_buffer_start;
337 if ( (0x100000 + low_buffer_size) > ((ulg)high_buffer_start)) {
338 high_buffer_start = (uch *)(0x100000 + low_buffer_size);
339 mv->hcount = 0; /* say: we need not to move high_buffer */
340 }
341 else mv->hcount = -1;
342 mv->high_buffer_start = high_buffer_start;
343}
344
345static void close_output_buffer_if_we_run_high(struct moveparams *mv)
346{
347 if (bytes_out > low_buffer_size) {
348 mv->lcount = low_buffer_size;
349 if (mv->hcount)
350 mv->hcount = bytes_out - low_buffer_size;
351 } else {
352 mv->lcount = bytes_out;
353 mv->hcount = 0;
354 }
355}
356
357
358asmlinkage int decompress_kernel(struct moveparams *mv, void *rmode)
359{
360 real_mode = rmode;
361
362 if (RM_SCREEN_INFO.orig_video_mode == 7) {
363 vidmem = (char *) 0xb0000;
364 vidport = 0x3b4;
365 } else {
366 vidmem = (char *) 0xb8000;
367 vidport = 0x3d4;
368 }
369
370 lines = RM_SCREEN_INFO.orig_video_lines;
371 cols = RM_SCREEN_INFO.orig_video_cols;
372
373 if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
374 else setup_output_buffer_if_we_run_high(mv);
375
376 makecrc();
377 putstr("Uncompressing Linux... ");
378 gunzip();
379 putstr("Ok, booting the kernel.\n");
380 if (high_loaded) close_output_buffer_if_we_run_high(mv);
381 return high_loaded;
382}