2 * linux/arch/mips/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 JZSOC by Peter Wei, 2008
25 #define memzero(s, n) memset ((s), 0, (n))
27 typedef unsigned char uch;
28 typedef unsigned short ush;
29 typedef unsigned long ulg;
31 #define WSIZE 0x8000 /* Window size must be at least 32k, */
32 /* and a power of two */
34 static uch *inbuf; /* input buffer */
35 static uch window[WSIZE]; /* Sliding window buffer */
37 static unsigned insize = 0; /* valid bytes in inbuf */
38 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
39 static unsigned outcnt = 0; /* bytes in output buffer */
42 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
43 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
44 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
45 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
46 #define COMMENT 0x10 /* bit 4 set: file comment present */
47 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
48 #define RESERVED 0xC0 /* bit 6,7: reserved */
50 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
52 /* Diagnostic functions */
54 # define Assert(cond,msg) {if(!(cond)) error(msg);}
55 # define Trace(x) fprintf x
56 # define Tracev(x) {if (verbose) fprintf x ;}
57 # define Tracevv(x) {if (verbose>1) fprintf x ;}
58 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
59 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
61 # define Assert(cond,msg)
69 static int fill_inbuf(void);
70 static void flush_window(void);
71 static void error(char *m);
72 static void gzip_mark(void **);
73 static void gzip_release(void **);
75 void* memset(void* s, int c, size_t n);
76 void* memcpy(void* __dest, __const void* __src, size_t __n);
78 extern void flushcaches(void); /* defined in head.S */
83 static long bytes_out = 0;
84 static uch *output_data;
85 static unsigned long output_ptr = 0;
88 static void *malloc(int size);
89 static void free(void *where);
90 static void error(char *m);
91 static void gzip_mark(void **);
92 static void gzip_release(void **);
94 static void puts(const char *str)
98 extern unsigned char _end[];
99 static unsigned long free_mem_ptr;
100 static unsigned long free_mem_end_ptr;
102 #define HEAP_SIZE 0x10000
104 #include "../../../../lib/inflate.c"
106 static void *malloc(int size)
110 if (size <0) error("Malloc error\n");
111 if (free_mem_ptr == 0) error("Memory error\n");
113 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
115 p = (void *)free_mem_ptr;
116 free_mem_ptr += size;
118 if (free_mem_ptr >= free_mem_end_ptr)
119 error("\nOut of memory\n");
124 static void free(void *where)
128 static void gzip_mark(void **ptr)
130 *ptr = (void *) free_mem_ptr;
133 static void gzip_release(void **ptr)
135 free_mem_ptr = (long) *ptr;
138 void* memset(void* s, int c, size_t n)
143 for (i=0;i<n;i++) ss[i] = c;
147 void* memcpy(void* __dest, __const void* __src, size_t __n)
150 unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
152 for (i = __n >> 3; i > 0; i--) {
181 /* ===========================================================================
182 * Fill the input buffer. This is called only when the buffer is empty
183 * and at least one byte is really needed.
185 static int fill_inbuf(void)
188 error("ran out of input data\n");
197 /* ===========================================================================
198 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
199 * (Used for the decompressed data only.)
201 static void flush_window(void)
203 ulg c = crc; /* temporary variable */
208 out = &output_data[output_ptr];
209 for (n = 0; n < outcnt; n++) {
211 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
214 bytes_out += (ulg)outcnt;
215 output_ptr += (ulg)outcnt;
219 static void error(char *x)
223 puts("\n\n -- System halted");
228 void decompress_kernel(unsigned int imageaddr, unsigned int imagesize, unsigned int loadaddr)
230 input_data = (char *)imageaddr;
231 input_len = imagesize;
233 output_data = (uch *)loadaddr;
234 free_mem_ptr = (unsigned long)_end;
235 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
238 puts("Uncompressing Linux...");
241 puts("Ok, booting the kernel.");