175 lines
4.4 KiB
C
175 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* misc.c
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*
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* This is a collection of several routines from gzip-1.0.3
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* adapted for Linux.
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*
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* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
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*
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* Modified for ARM Linux by Russell King
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*
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* Nicolas Pitre <nico@visuaide.com> 1999/04/14 :
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* For this code to run directly from Flash, all constant variables must
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* be marked with 'const' and all other variables initialized at run-time
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* only. This way all non constant variables will end up in the bss segment,
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* which should point to addresses in RAM and cleared to 0 on start.
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* This allows for a much quicker boot time.
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*
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* Modified for Alpha, from the ARM version, by Jay Estabrook 2003.
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#define memzero(s,n) memset ((s),0,(n))
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#define puts srm_printk
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extern long srm_printk(const char *, ...)
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__attribute__ ((format (printf, 1, 2)));
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/*
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* gzip declarations
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*/
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#define OF(args) args
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#define STATIC static
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typedef unsigned char uch;
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typedef unsigned short ush;
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typedef unsigned long ulg;
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#define WSIZE 0x8000 /* Window size must be at least 32k, */
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/* and a power of two */
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static uch *inbuf; /* input buffer */
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static uch *window; /* Sliding window buffer */
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static unsigned insize; /* valid bytes in inbuf */
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static unsigned inptr; /* index of next byte to be processed in inbuf */
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static unsigned outcnt; /* bytes in output buffer */
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/* gzip flag byte */
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#define ASCII_FLAG 0x01 /* bit 0 set: file probably ascii text */
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#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
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#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
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#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
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#define COMMENT 0x10 /* bit 4 set: file comment present */
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#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
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#define RESERVED 0xC0 /* bit 6,7: reserved */
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#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
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/* Diagnostic functions */
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#ifdef DEBUG
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# define Assert(cond,msg) {if(!(cond)) error(msg);}
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# define Trace(x) fprintf x
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# define Tracev(x) {if (verbose) fprintf x ;}
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# define Tracevv(x) {if (verbose>1) fprintf x ;}
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# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
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# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
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#else
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# define Assert(cond,msg)
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# define Trace(x)
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# define Tracev(x)
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# define Tracevv(x)
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# define Tracec(c,x)
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# define Tracecv(c,x)
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#endif
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static int fill_inbuf(void);
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static void flush_window(void);
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static void error(char *m);
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static char *input_data;
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static int input_data_size;
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static uch *output_data;
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static ulg output_ptr;
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static ulg bytes_out;
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static void error(char *m);
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static void gzip_mark(void **);
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static void gzip_release(void **);
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extern int end;
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static ulg free_mem_ptr;
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static ulg free_mem_end_ptr;
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#define HEAP_SIZE 0x3000
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#include "../../../lib/inflate.c"
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/* ===========================================================================
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* Fill the input buffer. This is called only when the buffer is empty
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* and at least one byte is really needed.
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*/
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int fill_inbuf(void)
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{
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if (insize != 0)
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error("ran out of input data");
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inbuf = input_data;
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insize = input_data_size;
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inptr = 1;
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return inbuf[0];
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}
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/* ===========================================================================
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* Write the output window window[0..outcnt-1] and update crc and bytes_out.
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* (Used for the decompressed data only.)
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*/
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void flush_window(void)
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{
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ulg c = crc;
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unsigned n;
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uch *in, *out, ch;
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in = window;
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out = &output_data[output_ptr];
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for (n = 0; n < outcnt; n++) {
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ch = *out++ = *in++;
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c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
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}
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crc = c;
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bytes_out += (ulg)outcnt;
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output_ptr += (ulg)outcnt;
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outcnt = 0;
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/* puts("."); */
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}
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static void error(char *x)
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{
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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while(1); /* Halt */
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}
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unsigned int
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decompress_kernel(void *output_start,
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void *input_start,
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size_t ksize,
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size_t kzsize)
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{
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output_data = (uch *)output_start;
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input_data = (uch *)input_start;
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input_data_size = kzsize; /* use compressed size */
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/* FIXME FIXME FIXME */
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free_mem_ptr = (ulg)output_start + ksize;
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free_mem_end_ptr = (ulg)output_start + ksize + 0x200000;
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/* FIXME FIXME FIXME */
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/* put in temp area to reduce initial footprint */
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window = malloc(WSIZE);
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makecrc();
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/* puts("Uncompressing Linux..."); */
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gunzip();
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/* puts(" done, booting the kernel.\n"); */
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return output_ptr;
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}
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