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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173// 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_printkextern 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);
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 intdecompress_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;}