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/arch/cris/arch-v10/boot/compressed/misc.c

https://bitbucket.org/evzijst/gittest
C | 273 lines | 187 code | 52 blank | 34 comment | 7 complexity | 76369bbadecf476a99f3b8622fe129cd MD5 | raw file
  1/*
  2 * misc.c
  3 *
  4 * $Id: misc.c,v 1.6 2003/10/27 08:04:31 starvik Exp $
  5 * 
  6 * This is a collection of several routines from gzip-1.0.3 
  7 * adapted for Linux.
  8 *
  9 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
 10 * puts by Nick Holloway 1993, better puts by Martin Mares 1995
 11 * adoptation for Linux/CRIS Axis Communications AB, 1999
 12 * 
 13 */
 14
 15/* where the piggybacked kernel image expects itself to live.
 16 * it is the same address we use when we network load an uncompressed
 17 * image into DRAM, and it is the address the kernel is linked to live
 18 * at by vmlinux.lds.S
 19 */
 20
 21#define KERNEL_LOAD_ADR 0x40004000
 22
 23#include <linux/config.h>
 24
 25#include <linux/types.h>
 26#include <asm/arch/svinto.h>
 27
 28/*
 29 * gzip declarations
 30 */
 31
 32#define OF(args)  args
 33#define STATIC static
 34
 35void* memset(void* s, int c, size_t n);
 36void* memcpy(void* __dest, __const void* __src,
 37	     size_t __n);
 38
 39#define memzero(s, n)     memset ((s), 0, (n))
 40
 41
 42typedef unsigned char  uch;
 43typedef unsigned short ush;
 44typedef unsigned long  ulg;
 45
 46#define WSIZE 0x8000		/* Window size must be at least 32k, */
 47				/* and a power of two */
 48
 49static uch *inbuf;	     /* input buffer */
 50static uch window[WSIZE];    /* Sliding window buffer */
 51
 52unsigned inptr = 0;	/* index of next byte to be processed in inbuf
 53			 * After decompression it will contain the
 54			 * compressed size, and head.S will read it.
 55			 */
 56
 57static unsigned outcnt = 0;  /* bytes in output buffer */
 58
 59/* gzip flag byte */
 60#define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
 61#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 62#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 63#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 64#define COMMENT      0x10 /* bit 4 set: file comment present */
 65#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 66#define RESERVED     0xC0 /* bit 6,7:   reserved */
 67
 68#define get_byte() inbuf[inptr++]	
 69	
 70/* Diagnostic functions */
 71#ifdef DEBUG
 72#  define Assert(cond,msg) {if(!(cond)) error(msg);}
 73#  define Trace(x) fprintf x
 74#  define Tracev(x) {if (verbose) fprintf x ;}
 75#  define Tracevv(x) {if (verbose>1) fprintf x ;}
 76#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 77#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 78#else
 79#  define Assert(cond,msg)
 80#  define Trace(x)
 81#  define Tracev(x)
 82#  define Tracevv(x)
 83#  define Tracec(c,x)
 84#  define Tracecv(c,x)
 85#endif
 86
 87static int  fill_inbuf(void);
 88static void flush_window(void);
 89static void error(char *m);
 90static void gzip_mark(void **);
 91static void gzip_release(void **);
 92
 93extern char *input_data;  /* lives in head.S */
 94
 95static long bytes_out = 0;
 96static uch *output_data;
 97static unsigned long output_ptr = 0;
 98 
 99static void *malloc(int size);
100static void free(void *where);
101static void error(char *m);
102static void gzip_mark(void **);
103static void gzip_release(void **);
104 
105static void puts(const char *);
106
107/* the "heap" is put directly after the BSS ends, at end */
108  
109extern int end;
110static long free_mem_ptr = (long)&end;
111 
112#include "../../../../../lib/inflate.c"
113
114static void *malloc(int size)
115{
116	void *p;
117
118	if (size <0) error("Malloc error");
119
120	free_mem_ptr = (free_mem_ptr + 3) & ~3;	/* Align */
121
122	p = (void *)free_mem_ptr;
123	free_mem_ptr += size;
124
125	return p;
126}
127
128static void free(void *where)
129{	/* Don't care */
130}
131
132static void gzip_mark(void **ptr)
133{
134	*ptr = (void *) free_mem_ptr;
135}
136
137static void gzip_release(void **ptr)
138{
139	free_mem_ptr = (long) *ptr;
140}
141
142/* decompressor info and error messages to serial console */
143
144static void
145puts(const char *s)
146{
147#ifndef CONFIG_ETRAX_DEBUG_PORT_NULL
148	while(*s) {
149#ifdef CONFIG_ETRAX_DEBUG_PORT0
150		while(!(*R_SERIAL0_STATUS & (1 << 5))) ;
151		*R_SERIAL0_TR_DATA = *s++;
152#endif
153#ifdef CONFIG_ETRAX_DEBUG_PORT1
154		while(!(*R_SERIAL1_STATUS & (1 << 5))) ;
155		*R_SERIAL1_TR_DATA = *s++;
156#endif
157#ifdef CONFIG_ETRAX_DEBUG_PORT2
158		while(!(*R_SERIAL2_STATUS & (1 << 5))) ;
159		*R_SERIAL2_TR_DATA = *s++;
160#endif
161#ifdef CONFIG_ETRAX_DEBUG_PORT3
162		while(!(*R_SERIAL3_STATUS & (1 << 5))) ;
163		*R_SERIAL3_TR_DATA = *s++;
164#endif
165	}
166#endif
167}
168
169void*
170memset(void* s, int c, size_t n)
171{
172	int i;
173	char *ss = (char*)s;
174
175	for (i=0;i<n;i++) ss[i] = c;
176}
177
178void*
179memcpy(void* __dest, __const void* __src,
180			    size_t __n)
181{
182	int i;
183	char *d = (char *)__dest, *s = (char *)__src;
184
185	for (i=0;i<__n;i++) d[i] = s[i];
186}
187
188/* ===========================================================================
189 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
190 * (Used for the decompressed data only.)
191 */
192
193static void
194flush_window()
195{
196    ulg c = crc;         /* temporary variable */
197    unsigned n;
198    uch *in, *out, ch;
199    
200    in = window;
201    out = &output_data[output_ptr]; 
202    for (n = 0; n < outcnt; n++) {
203	    ch = *out++ = *in++;
204	    c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
205    }
206    crc = c;
207    bytes_out += (ulg)outcnt;
208    output_ptr += (ulg)outcnt;
209    outcnt = 0;
210}
211
212static void
213error(char *x)
214{
215	puts("\n\n");
216	puts(x);
217	puts("\n\n -- System halted\n");
218
219	while(1);	/* Halt */
220}
221
222void
223setup_normal_output_buffer()
224{
225	output_data = (char *)KERNEL_LOAD_ADR;
226}
227
228void
229decompress_kernel()
230{
231	char revision;
232	
233	/* input_data is set in head.S */
234	inbuf = input_data;
235
236#ifdef CONFIG_ETRAX_DEBUG_PORT0
237	*R_SERIAL0_XOFF = 0;
238	*R_SERIAL0_BAUD = 0x99;
239	*R_SERIAL0_TR_CTRL = 0x40;
240#endif
241#ifdef CONFIG_ETRAX_DEBUG_PORT1
242	*R_SERIAL1_XOFF = 0;
243	*R_SERIAL1_BAUD = 0x99;
244	*R_SERIAL1_TR_CTRL = 0x40;
245#endif
246#ifdef CONFIG_ETRAX_DEBUG_PORT2
247	*R_GEN_CONFIG = 0x08;
248	*R_SERIAL2_XOFF = 0;
249	*R_SERIAL2_BAUD = 0x99;
250	*R_SERIAL2_TR_CTRL = 0x40;
251#endif
252#ifdef CONFIG_ETRAX_DEBUG_PORT3
253	*R_GEN_CONFIG = 0x100;
254	*R_SERIAL3_XOFF = 0;
255	*R_SERIAL3_BAUD = 0x99;
256	*R_SERIAL3_TR_CTRL = 0x40;
257#endif
258
259	setup_normal_output_buffer();
260
261	makecrc();
262
263	__asm__ volatile ("move vr,%0" : "=rm" (revision));
264	if (revision < 10)
265	{
266		puts("You need an ETRAX 100LX to run linux 2.6\n");
267		while(1);
268	}
269
270	puts("Uncompressing Linux...\n");
271	gunzip();
272	puts("Done. Now booting the kernel.\n");
273}