2 * arch/m32r/boot/compressed/misc.c
4 * This is a collection of several routines from gzip-1.0.3
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
9 * Adapted for SH by Stuart Menefy, Aug 1999
11 * 2003-02-12: Support M32R by Takeo Takahashi
12 * This is based on arch/sh/boot/compressed/misc.c.
15 #include <linux/string.h>
26 #define memzero(s, n) memset ((s), 0, (n))
28 typedef unsigned char uch;
29 typedef unsigned short ush;
30 typedef unsigned long ulg;
32 #define WSIZE 0x8000 /* Window size must be at least 32k, */
33 /* and a power of two */
35 static uch *inbuf; /* input buffer */
36 static uch window[WSIZE]; /* Sliding window buffer */
38 static unsigned insize = 0; /* valid bytes in inbuf */
39 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
40 static unsigned outcnt = 0; /* bytes in output buffer */
43 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
44 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
45 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
46 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
47 #define COMMENT 0x10 /* bit 4 set: file comment present */
48 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
49 #define RESERVED 0xC0 /* bit 6,7: reserved */
51 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
53 /* Diagnostic functions */
55 # define Assert(cond,msg) {if(!(cond)) error(msg);}
56 # define Trace(x) fprintf x
57 # define Tracev(x) {if (verbose) fprintf x ;}
58 # define Tracevv(x) {if (verbose>1) fprintf x ;}
59 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
60 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
62 # define Assert(cond,msg)
70 static int fill_inbuf(void);
71 static void flush_window(void);
72 static void error(char *m);
73 static void gzip_mark(void **);
74 static void gzip_release(void **);
76 static unsigned char *input_data;
79 static long bytes_out = 0;
80 static uch *output_data;
81 static unsigned long output_ptr = 0;
85 static void *malloc(int size);
86 static void free(void *where);
88 static unsigned long free_mem_ptr;
89 static unsigned long free_mem_end_ptr;
91 #define HEAP_SIZE 0x10000
93 #include "../../../../lib/inflate.c"
95 static void *malloc(int size)
99 if (size <0) error("Malloc error");
100 if (free_mem_ptr == 0) error("Memory error");
102 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
104 p = (void *)free_mem_ptr;
105 free_mem_ptr += size;
107 if (free_mem_ptr >= free_mem_end_ptr)
108 error("Out of memory");
113 static void free(void *where)
117 static void gzip_mark(void **ptr)
119 *ptr = (void *) free_mem_ptr;
122 static void gzip_release(void **ptr)
124 free_mem_ptr = (long) *ptr;
127 void* memset(void* s, int c, size_t n)
132 for (i=0;i<n;i++) ss[i] = c;
136 void* memcpy(void* __dest, __const void* __src,
140 char *d = (char *)__dest, *s = (char *)__src;
142 for (i=0;i<__n;i++) d[i] = s[i];
146 /* ===========================================================================
147 * Fill the input buffer. This is called only when the buffer is empty
148 * and at least one byte is really needed.
150 static int fill_inbuf(void)
153 error("ran out of input data");
162 /* ===========================================================================
163 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
164 * (Used for the decompressed data only.)
166 static void flush_window(void)
168 ulg c = crc; /* temporary variable */
173 out = &output_data[output_ptr];
174 for (n = 0; n < outcnt; n++) {
176 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
179 bytes_out += (ulg)outcnt;
180 output_ptr += (ulg)outcnt;
184 static void error(char *x)
188 puts("\n\n -- System halted");
193 /* return decompressed size */
195 decompress_kernel(int mmu_on, unsigned char *zimage_data,
196 unsigned int zimage_len, unsigned long heap)
198 output_data = (unsigned char *)CONFIG_MEMORY_START + 0x2000
199 + (mmu_on ? 0x80000000 : 0);
201 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
202 input_data = zimage_data;
203 input_len = zimage_len;
206 puts("Uncompressing Linux... ");
208 puts("Ok, booting the kernel.\n");