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1/*
2 * misc.c
3 *
4 * This is a collection of several routines from gzip-1.0.3
5 * adapted for Linux.
6 *
7 * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
8 *
9 * Modified for ARM Linux by Russell King
10 *
11 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
12 * For this code to run directly from Flash, all constant variables must
13 * be marked with 'const' and all other variables initialized at run-time
14 * only. This way all non constant variables will end up in the bss segment,
15 * which should point to addresses in RAM and cleared to 0 on start.
16 * This allows for a much quicker boot time.
17 *
18 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
19 */
20
21#include <linux/kernel.h>
22#include <linux/slab.h>
23
24#include <asm/uaccess.h>
25
26#define memzero(s,n) memset ((s),0,(n))
27#define puts srm_printk
28extern long srm_printk(const char *, ...)
29 __attribute__ ((format (printf, 1, 2)));
30
31/*
32 * gzip delarations
33 */
34#define OF(args) args
35#define STATIC static
36
37typedef unsigned char uch;
38typedef unsigned short ush;
39typedef unsigned long ulg;
40
41#define WSIZE 0x8000 /* Window size must be at least 32k, */
42 /* and a power of two */
43
44static uch *inbuf; /* input buffer */
45static uch *window; /* Sliding window buffer */
46
47static unsigned insize; /* valid bytes in inbuf */
48static unsigned inptr; /* index of next byte to be processed in inbuf */
49static unsigned outcnt; /* bytes in output buffer */
50
51/* gzip flag byte */
52#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
53#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
54#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
55#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
56#define COMMENT 0x10 /* bit 4 set: file comment present */
57#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
58#define RESERVED 0xC0 /* bit 6,7: reserved */
59
60#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
61
62/* Diagnostic functions */
63#ifdef DEBUG
64# define Assert(cond,msg) {if(!(cond)) error(msg);}
65# define Trace(x) fprintf x
66# define Tracev(x) {if (verbose) fprintf x ;}
67# define Tracevv(x) {if (verbose>1) fprintf x ;}
68# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
69# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
70#else
71# define Assert(cond,msg)
72# define Trace(x)
73# define Tracev(x)
74# define Tracevv(x)
75# define Tracec(c,x)
76# define Tracecv(c,x)
77#endif
78
79static int fill_inbuf(void);
80static void flush_window(void);
81static void error(char *m);
82
83static char *input_data;
84static int input_data_size;
85
86static uch *output_data;
87static ulg output_ptr;
88static ulg bytes_out;
89
90static void error(char *m);
91static void gzip_mark(void **);
92static void gzip_release(void **);
93
94extern int end;
95static ulg free_mem_ptr;
96static ulg free_mem_end_ptr;
97
98#define HEAP_SIZE 0x3000
99
100#include "../../../lib/inflate.c"
101
102/* ===========================================================================
103 * Fill the input buffer. This is called only when the buffer is empty
104 * and at least one byte is really needed.
105 */
106int fill_inbuf(void)
107{
108 if (insize != 0)
109 error("ran out of input data");
110
111 inbuf = input_data;
112 insize = input_data_size;
113
114 inptr = 1;
115 return inbuf[0];
116}
117
118/* ===========================================================================
119 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
120 * (Used for the decompressed data only.)
121 */
122void flush_window(void)
123{
124 ulg c = crc;
125 unsigned n;
126 uch *in, *out, ch;
127
128 in = window;
129 out = &output_data[output_ptr];
130 for (n = 0; n < outcnt; n++) {
131 ch = *out++ = *in++;
132 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
133 }
134 crc = c;
135 bytes_out += (ulg)outcnt;
136 output_ptr += (ulg)outcnt;
137 outcnt = 0;
138/* puts("."); */
139}
140
141static void error(char *x)
142{
143 puts("\n\n");
144 puts(x);
145 puts("\n\n -- System halted");
146
147 while(1); /* Halt */
148}
149
150unsigned int
151decompress_kernel(void *output_start,
152 void *input_start,
153 size_t ksize,
154 size_t kzsize)
155{
156 output_data = (uch *)output_start;
157 input_data = (uch *)input_start;
158 input_data_size = kzsize; /* use compressed size */
159
160 /* FIXME FIXME FIXME */
161 free_mem_ptr = (ulg)output_start + ksize;
162 free_mem_end_ptr = (ulg)output_start + ksize + 0x200000;
163 /* FIXME FIXME FIXME */
164
165 /* put in temp area to reduce initial footprint */
166 window = malloc(WSIZE);
167
168 makecrc();
169/* puts("Uncompressing Linux..."); */
170 gunzip();
171/* puts(" done, booting the kernel.\n"); */
172 return output_ptr;
173}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * misc.c
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 * Modified for ARM Linux by Russell King
11 *
12 * Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
13 * For this code to run directly from Flash, all constant variables must
14 * be marked with 'const' and all other variables initialized at run-time
15 * only. This way all non constant variables will end up in the bss segment,
16 * which should point to addresses in RAM and cleared to 0 on start.
17 * This allows for a much quicker boot time.
18 *
19 * Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
20 */
21
22#include <linux/kernel.h>
23#include <linux/slab.h>
24
25#include <linux/uaccess.h>
26
27#define memzero(s,n) memset ((s),0,(n))
28#define puts srm_printk
29extern long srm_printk(const char *, ...)
30 __attribute__ ((format (printf, 1, 2)));
31
32/*
33 * gzip declarations
34 */
35#define OF(args) args
36#define STATIC static
37
38typedef unsigned char uch;
39typedef unsigned short ush;
40typedef unsigned long ulg;
41
42#define WSIZE 0x8000 /* Window size must be at least 32k, */
43 /* and a power of two */
44
45static uch *inbuf; /* input buffer */
46static uch *window; /* Sliding window buffer */
47
48static unsigned insize; /* valid bytes in inbuf */
49static unsigned inptr; /* index of next byte to be processed in inbuf */
50static unsigned outcnt; /* bytes in output buffer */
51
52/* gzip flag byte */
53#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
54#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
55#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
56#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
57#define COMMENT 0x10 /* bit 4 set: file comment present */
58#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
59#define RESERVED 0xC0 /* bit 6,7: reserved */
60
61#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
62
63/* Diagnostic functions */
64#ifdef DEBUG
65# define Assert(cond,msg) {if(!(cond)) error(msg);}
66# define Trace(x) fprintf x
67# define Tracev(x) {if (verbose) fprintf x ;}
68# define Tracevv(x) {if (verbose>1) fprintf x ;}
69# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
70# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
71#else
72# define Assert(cond,msg)
73# define Trace(x)
74# define Tracev(x)
75# define Tracevv(x)
76# define Tracec(c,x)
77# define Tracecv(c,x)
78#endif
79
80static int fill_inbuf(void);
81static void flush_window(void);
82static void error(char *m);
83
84static char *input_data;
85static int input_data_size;
86
87static uch *output_data;
88static ulg output_ptr;
89static ulg bytes_out;
90
91static void error(char *m);
92static void gzip_mark(void **);
93static void gzip_release(void **);
94
95extern int end;
96static ulg free_mem_ptr;
97static ulg free_mem_end_ptr;
98
99#define HEAP_SIZE 0x3000
100
101#include "../../../lib/inflate.c"
102
103/* ===========================================================================
104 * Fill the input buffer. This is called only when the buffer is empty
105 * and at least one byte is really needed.
106 */
107int fill_inbuf(void)
108{
109 if (insize != 0)
110 error("ran out of input data");
111
112 inbuf = input_data;
113 insize = input_data_size;
114
115 inptr = 1;
116 return inbuf[0];
117}
118
119/* ===========================================================================
120 * Write the output window window[0..outcnt-1] and update crc and bytes_out.
121 * (Used for the decompressed data only.)
122 */
123void flush_window(void)
124{
125 ulg c = crc;
126 unsigned n;
127 uch *in, *out, ch;
128
129 in = window;
130 out = &output_data[output_ptr];
131 for (n = 0; n < outcnt; n++) {
132 ch = *out++ = *in++;
133 c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
134 }
135 crc = c;
136 bytes_out += (ulg)outcnt;
137 output_ptr += (ulg)outcnt;
138 outcnt = 0;
139/* puts("."); */
140}
141
142static void error(char *x)
143{
144 puts("\n\n");
145 puts(x);
146 puts("\n\n -- System halted");
147
148 while(1); /* Halt */
149}
150
151unsigned int
152decompress_kernel(void *output_start,
153 void *input_start,
154 size_t ksize,
155 size_t kzsize)
156{
157 output_data = (uch *)output_start;
158 input_data = (uch *)input_start;
159 input_data_size = kzsize; /* use compressed size */
160
161 /* FIXME FIXME FIXME */
162 free_mem_ptr = (ulg)output_start + ksize;
163 free_mem_end_ptr = (ulg)output_start + ksize + 0x200000;
164 /* FIXME FIXME FIXME */
165
166 /* put in temp area to reduce initial footprint */
167 window = malloc(WSIZE);
168
169 makecrc();
170/* puts("Uncompressing Linux..."); */
171 gunzip();
172/* puts(" done, booting the kernel.\n"); */
173 return output_ptr;
174}