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/config.h>
16 #include <linux/string.h>
27 #define memzero(s, n) memset ((s), 0, (n))
29 typedef unsigned char uch;
30 typedef unsigned short ush;
31 typedef unsigned long ulg;
33 #define WSIZE 0x8000 /* Window size must be at least 32k, */
34 /* and a power of two */
36 static uch *inbuf; /* input buffer */
37 static uch window[WSIZE]; /* Sliding window buffer */
39 static unsigned insize = 0; /* valid bytes in inbuf */
40 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
41 static unsigned outcnt = 0; /* bytes in output buffer */
44 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
45 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
46 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
47 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
48 #define COMMENT 0x10 /* bit 4 set: file comment present */
49 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
50 #define RESERVED 0xC0 /* bit 6,7: reserved */
52 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
54 /* Diagnostic functions */
56 # define Assert(cond,msg) {if(!(cond)) error(msg);}
57 # define Trace(x) fprintf x
58 # define Tracev(x) {if (verbose) fprintf x ;}
59 # define Tracevv(x) {if (verbose>1) fprintf x ;}
60 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
61 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
63 # define Assert(cond,msg)
71 static int fill_inbuf(void);
72 static void flush_window(void);
73 static void error(char *m);
74 static void gzip_mark(void **);
75 static void gzip_release(void **);
77 static unsigned char *input_data;
80 static long bytes_out = 0;
81 static uch *output_data;
82 static unsigned long output_ptr = 0;
86 static void *malloc(int size);
87 static void free(void *where);
89 static unsigned long free_mem_ptr;
90 static unsigned long free_mem_end_ptr;
92 #define HEAP_SIZE 0x10000
94 #include "../../../../lib/inflate.c"
96 static void *malloc(int size)
100 if (size <0) error("Malloc error");
101 if (free_mem_ptr == 0) error("Memory error");
103 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
105 p = (void *)free_mem_ptr;
106 free_mem_ptr += size;
108 if (free_mem_ptr >= free_mem_end_ptr)
109 error("Out of memory");
114 static void free(void *where)
118 static void gzip_mark(void **ptr)
120 *ptr = (void *) free_mem_ptr;
123 static void gzip_release(void **ptr)
125 free_mem_ptr = (long) *ptr;
128 void* memset(void* s, int c, size_t n)
133 for (i=0;i<n;i++) ss[i] = c;
137 void* memcpy(void* __dest, __const void* __src,
141 char *d = (char *)__dest, *s = (char *)__src;
143 for (i=0;i<__n;i++) d[i] = s[i];
147 /* ===========================================================================
148 * Fill the input buffer. This is called only when the buffer is empty
149 * and at least one byte is really needed.
151 static int fill_inbuf(void)
154 error("ran out of input data");
163 /* ===========================================================================
164 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
165 * (Used for the decompressed data only.)
167 static void flush_window(void)
169 ulg c = crc; /* temporary variable */
174 out = &output_data[output_ptr];
175 for (n = 0; n < outcnt; n++) {
177 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
180 bytes_out += (ulg)outcnt;
181 output_ptr += (ulg)outcnt;
185 static void error(char *x)
189 puts("\n\n -- System halted");
194 /* return decompressed size */
196 decompress_kernel(int mmu_on, unsigned char *zimage_data,
197 unsigned int zimage_len, unsigned long heap)
199 output_data = (unsigned char *)CONFIG_MEMORY_START + 0x2000
200 + (mmu_on ? 0x80000000 : 0);
202 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
203 input_data = zimage_data;
204 input_len = zimage_len;
207 puts("Uncompressing Linux... ");
209 puts("Ok, booting the kernel.\n");