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/arch/sh/boot/compressed/misc.c

https://bitbucket.org/evzijst/gittest
C | 240 lines | 169 code | 44 blank | 27 comment | 12 complexity | ee776998c9aaf168549f7cfba198ad7f MD5 | raw file
  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 <linux/config.h>
 15#include <asm/uaccess.h>
 16#ifdef CONFIG_SH_STANDARD_BIOS
 17#include <asm/sh_bios.h>
 18#endif
 19
 20/*
 21 * gzip declarations
 22 */
 23
 24#define OF(args)  args
 25#define STATIC static
 26
 27#undef memset
 28#undef memcpy
 29#define memzero(s, n)     memset ((s), 0, (n))
 30
 31typedef unsigned char  uch;
 32typedef unsigned short ush;
 33typedef unsigned long  ulg;
 34
 35#define WSIZE 0x8000		/* Window size must be at least 32k, */
 36				/* and a power of two */
 37
 38static uch *inbuf;	     /* input buffer */
 39static uch window[WSIZE];    /* Sliding window buffer */
 40
 41static unsigned insize = 0;  /* valid bytes in inbuf */
 42static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */
 43static unsigned outcnt = 0;  /* bytes in output buffer */
 44
 45/* gzip flag byte */
 46#define ASCII_FLAG   0x01 /* bit 0 set: file probably ASCII text */
 47#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
 48#define EXTRA_FIELD  0x04 /* bit 2 set: extra field present */
 49#define ORIG_NAME    0x08 /* bit 3 set: original file name present */
 50#define COMMENT      0x10 /* bit 4 set: file comment present */
 51#define ENCRYPTED    0x20 /* bit 5 set: file is encrypted */
 52#define RESERVED     0xC0 /* bit 6,7:   reserved */
 53
 54#define get_byte()  (inptr < insize ? inbuf[inptr++] : fill_inbuf())
 55
 56/* Diagnostic functions */
 57#ifdef DEBUG
 58#  define Assert(cond,msg) {if(!(cond)) error(msg);}
 59#  define Trace(x) fprintf x
 60#  define Tracev(x) {if (verbose) fprintf x ;}
 61#  define Tracevv(x) {if (verbose>1) fprintf x ;}
 62#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
 63#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
 64#else
 65#  define Assert(cond,msg)
 66#  define Trace(x)
 67#  define Tracev(x)
 68#  define Tracevv(x)
 69#  define Tracec(c,x)
 70#  define Tracecv(c,x)
 71#endif
 72
 73static int  fill_inbuf(void);
 74static void flush_window(void);
 75static void error(char *m);
 76static void gzip_mark(void **);
 77static void gzip_release(void **);
 78
 79extern char input_data[];
 80extern int input_len;
 81
 82static long bytes_out = 0;
 83static uch *output_data;
 84static unsigned long output_ptr = 0;
 85
 86static void *malloc(int size);
 87static void free(void *where);
 88static void error(char *m);
 89static void gzip_mark(void **);
 90static void gzip_release(void **);
 91
 92int puts(const char *);
 93
 94extern int _text;		/* Defined in vmlinux.lds.S */
 95extern int _end;
 96static unsigned long free_mem_ptr;
 97static unsigned long free_mem_end_ptr;
 98
 99#define HEAP_SIZE             0x10000
100
101#include "../../../../lib/inflate.c"
102
103static void *malloc(int size)
104{
105	void *p;
106
107	if (size <0) error("Malloc error");
108	if (free_mem_ptr == 0) error("Memory error");
109
110	free_mem_ptr = (free_mem_ptr + 3) & ~3;	/* Align */
111
112	p = (void *)free_mem_ptr;
113	free_mem_ptr += size;
114
115	if (free_mem_ptr >= free_mem_end_ptr)
116		error("Out of memory");
117
118	return p;
119}
120
121static void free(void *where)
122{	/* Don't care */
123}
124
125static void gzip_mark(void **ptr)
126{
127	*ptr = (void *) free_mem_ptr;
128}
129
130static void gzip_release(void **ptr)
131{
132	free_mem_ptr = (long) *ptr;
133}
134
135#ifdef CONFIG_SH_STANDARD_BIOS
136size_t strlen(const char *s)
137{
138	int i = 0;
139
140	while (*s++)
141		i++;
142	return i;
143}
144
145int puts(const char *s)
146{
147	int len = strlen(s);
148	sh_bios_console_write(s, len);
149	return len;
150}
151#else
152int puts(const char *s)
153{
154	/* This should be updated to use the sh-sci routines */
155	return 0;
156}
157#endif
158
159void* memset(void* s, int c, size_t n)
160{
161	int i;
162	char *ss = (char*)s;
163
164	for (i=0;i<n;i++) ss[i] = c;
165	return s;
166}
167
168void* memcpy(void* __dest, __const void* __src,
169			    size_t __n)
170{
171	int i;
172	char *d = (char *)__dest, *s = (char *)__src;
173
174	for (i=0;i<__n;i++) d[i] = s[i];
175	return __dest;
176}
177
178/* ===========================================================================
179 * Fill the input buffer. This is called only when the buffer is empty
180 * and at least one byte is really needed.
181 */
182static int fill_inbuf(void)
183{
184	if (insize != 0) {
185		error("ran out of input data");
186	}
187
188	inbuf = input_data;
189	insize = input_len;
190	inptr = 1;
191	return inbuf[0];
192}
193
194/* ===========================================================================
195 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
196 * (Used for the decompressed data only.)
197 */
198static void flush_window(void)
199{
200    ulg c = crc;         /* temporary variable */
201    unsigned n;
202    uch *in, *out, ch;
203
204    in = window;
205    out = &output_data[output_ptr];
206    for (n = 0; n < outcnt; n++) {
207	    ch = *out++ = *in++;
208	    c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
209    }
210    crc = c;
211    bytes_out += (ulg)outcnt;
212    output_ptr += (ulg)outcnt;
213    outcnt = 0;
214}
215
216static void error(char *x)
217{
218	puts("\n\n");
219	puts(x);
220	puts("\n\n -- System halted");
221
222	while(1);	/* Halt */
223}
224
225#define STACK_SIZE (4096)
226long user_stack [STACK_SIZE];
227long* stack_start = &user_stack[STACK_SIZE];
228
229void decompress_kernel(void)
230{
231	output_data = 0;
232	output_ptr = (unsigned long)&_text+0x20001000;
233	free_mem_ptr = (unsigned long)&_end;
234	free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
235
236	makecrc();
237	puts("Uncompressing Linux... ");
238	gunzip();
239	puts("Ok, booting the kernel.\n");
240}