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