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.");
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