2 * arch/sh/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 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
14 #include <asm/uaccess.h>
15 #ifdef CONFIG_SH_STANDARD_BIOS
16 #include <asm/sh_bios.h>
28 #define memzero(s, n) memset ((s), 0, (n))
30 typedef unsigned char uch;
31 typedef unsigned short ush;
32 typedef unsigned long ulg;
34 #define WSIZE 0x8000 /* Window size must be at least 32k, */
35 /* and a power of two */
37 static uch *inbuf; /* input buffer */
38 static uch window[WSIZE]; /* Sliding window buffer */
40 static unsigned insize = 0; /* valid bytes in inbuf */
41 static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
42 static unsigned outcnt = 0; /* bytes in output buffer */
45 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
46 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
47 #define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
48 #define ORIG_NAME 0x08 /* bit 3 set: original file name present */
49 #define COMMENT 0x10 /* bit 4 set: file comment present */
50 #define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
51 #define RESERVED 0xC0 /* bit 6,7: reserved */
53 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
55 /* Diagnostic functions */
57 # define Assert(cond,msg) {if(!(cond)) error(msg);}
58 # define Trace(x) fprintf x
59 # define Tracev(x) {if (verbose) fprintf x ;}
60 # define Tracevv(x) {if (verbose>1) fprintf x ;}
61 # define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
62 # define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
64 # define Assert(cond,msg)
72 static int fill_inbuf(void);
73 static void flush_window(void);
74 static void error(char *m);
75 static void gzip_mark(void **);
76 static void gzip_release(void **);
78 extern char input_data[];
81 static long bytes_out = 0;
82 static uch *output_data;
83 static unsigned long output_ptr = 0;
85 static void *malloc(int size);
86 static void free(void *where);
87 static void error(char *m);
88 static void gzip_mark(void **);
89 static void gzip_release(void **);
91 int puts(const char *);
93 extern int _text; /* Defined in vmlinux.lds.S */
95 static unsigned long free_mem_ptr;
96 static unsigned long free_mem_end_ptr;
98 #define HEAP_SIZE 0x10000
100 #include "../../../../lib/inflate.c"
102 static void *malloc(int size)
106 if (size <0) error("Malloc error");
107 if (free_mem_ptr == 0) error("Memory error");
109 free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
111 p = (void *)free_mem_ptr;
112 free_mem_ptr += size;
114 if (free_mem_ptr >= free_mem_end_ptr)
115 error("Out of memory");
120 static void free(void *where)
124 static void gzip_mark(void **ptr)
126 *ptr = (void *) free_mem_ptr;
129 static void gzip_release(void **ptr)
131 free_mem_ptr = (long) *ptr;
134 #ifdef CONFIG_SH_STANDARD_BIOS
135 size_t strlen(const char *s)
144 int puts(const char *s)
147 sh_bios_console_write(s, len);
151 int puts(const char *s)
153 /* This should be updated to use the sh-sci routines */
158 void* memset(void* s, int c, size_t n)
163 for (i=0;i<n;i++) ss[i] = c;
167 void* memcpy(void* __dest, __const void* __src,
171 char *d = (char *)__dest, *s = (char *)__src;
173 for (i=0;i<__n;i++) d[i] = s[i];
177 /* ===========================================================================
178 * Fill the input buffer. This is called only when the buffer is empty
179 * and at least one byte is really needed.
181 static int fill_inbuf(void)
184 error("ran out of input data");
193 /* ===========================================================================
194 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
195 * (Used for the decompressed data only.)
197 static void flush_window(void)
199 ulg c = crc; /* temporary variable */
204 out = &output_data[output_ptr];
205 for (n = 0; n < outcnt; n++) {
207 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
210 bytes_out += (ulg)outcnt;
211 output_ptr += (ulg)outcnt;
215 static void error(char *x)
219 puts("\n\n -- System halted");
224 #define STACK_SIZE (4096)
225 long user_stack [STACK_SIZE];
226 long* stack_start = &user_stack[STACK_SIZE];
228 void decompress_kernel(void)
231 output_ptr = (unsigned long)&_text+0x20001000;
232 free_mem_ptr = (unsigned long)&_end;
233 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
236 puts("Uncompressing Linux... ");
238 puts("Ok, booting the kernel.\n");