1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2009 Thomas Chou <thomas@wytron.com.tw>
4 *
5 * This is a collection of several routines from gzip-1.0.3
6 * adapted for Linux.
7 *
8 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
9 *
10 * Adapted for SH by Stuart Menefy, Aug 1999
11 *
12 * Modified to use standard LinuxSH BIOS by Greg Banks 7Jul2000
13 *
14 * Based on arch/sh/boot/compressed/misc.c
15 */
16
17 #include <linux/string.h>
18
19 /*
20 * gzip declarations
21 */
22 #define OF(args) args
23 #define STATIC static
24
25 #undef memset
26 #undef memcpy
27 #define memzero(s, n) memset((s), 0, (n))
28
29 typedef unsigned char uch;
30 typedef unsigned short ush;
31 typedef unsigned long ulg;
32 #define WSIZE 0x8000 /* Window size must be at least 32k, */
33 /* and a power of two */
34
35 static uch *inbuf; /* input buffer */
36 static uch window[WSIZE]; /* Sliding window buffer */
37
38 static unsigned insize; /* valid bytes in inbuf */
39 static unsigned inptr; /* index of next byte to be processed in inbuf */
40 static unsigned outcnt; /* bytes in output buffer */
41
42 /* gzip flag byte */
43 #define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
44 #define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip
45 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 */
51
52 #define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
53
54 #ifdef DEBUG
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 ; }
61 #else
62 # define Assert(cond, msg)
63 # define Trace(x)
64 # define Tracev(x)
65 # define Tracevv(x)
66 # define Tracec(c, x)
67 # define Tracecv(c, x)
68 #endif
69 static int fill_inbuf(void);
70 static void flush_window(void);
71 static void error(char *m);
72
73 extern char input_data[];
74 extern int input_len;
75
76 static long bytes_out;
77 static uch *output_data;
78 static unsigned long output_ptr;
79
80 #include "console.c"
81
82 static void error(char *m);
83
84 int puts(const char *);
85
86 extern int _end;
87 static unsigned long free_mem_ptr;
88 static unsigned long free_mem_end_ptr;
89
90 #define HEAP_SIZE 0x10000
91
92 #include "../../../../lib/inflate.c"
93
memset(void * s,int c,size_t n)94 void *memset(void *s, int c, size_t n)
95 {
96 int i;
97 char *ss = (char *)s;
98
99 for (i = 0; i < n; i++)
100 ss[i] = c;
101 return s;
102 }
103
memcpy(void * __dest,__const void * __src,size_t __n)104 void *memcpy(void *__dest, __const void *__src, size_t __n)
105 {
106 int i;
107 char *d = (char *)__dest, *s = (char *)__src;
108
109 for (i = 0; i < __n; i++)
110 d[i] = s[i];
111 return __dest;
112 }
113
114 /*
115 * Fill the input buffer. This is called only when the buffer is empty
116 * and at least one byte is really needed.
117 */
fill_inbuf(void)118 static int fill_inbuf(void)
119 {
120 if (insize != 0)
121 error("ran out of input data");
122
123 inbuf = input_data;
124 insize = input_len;
125 inptr = 1;
126 return inbuf[0];
127 }
128
129 /*
130 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
131 * (Used for the decompressed data only.)
132 */
flush_window(void)133 static void flush_window(void)
134 {
135 ulg c = crc; /* temporary variable */
136 unsigned n;
137 uch *in, *out, ch;
138
139 in = window;
140 out = &output_data[output_ptr];
141 for (n = 0; n < outcnt; n++) {
142 ch = *out++ = *in++;
143 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
144 }
145 crc = c;
146 bytes_out += (ulg)outcnt;
147 output_ptr += (ulg)outcnt;
148 outcnt = 0;
149 }
150
error(char * x)151 static void error(char *x)
152 {
153 puts("\nERROR\n");
154 puts(x);
155 puts("\n\n -- System halted");
156
157 while (1) /* Halt */
158 ;
159 }
160
decompress_kernel(void)161 void decompress_kernel(void)
162 {
163 output_data = (void *) (CONFIG_NIOS2_MEM_BASE |
164 CONFIG_NIOS2_KERNEL_REGION_BASE);
165 output_ptr = 0;
166 free_mem_ptr = (unsigned long)&_end;
167 free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
168
169 console_init();
170 makecrc();
171 puts("Uncompressing Linux... ");
172 gunzip();
173 puts("Ok, booting the kernel.\n");
174 }
175