317 lines
6.3 KiB
C
317 lines
6.3 KiB
C
/*
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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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unsigned int __machine_arch_type;
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#include <linux/kernel.h>
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#include <asm/uaccess.h>
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#include "uncompress.h"
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#ifdef STANDALONE_DEBUG
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#define puts printf
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#endif
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#define __ptr_t void *
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/*
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* Optimised C version of memzero for the ARM.
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*/
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void __memzero (__ptr_t s, size_t n)
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{
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union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
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int i;
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u.vp = s;
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for (i = n >> 5; i > 0; i--) {
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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}
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if (n & 1 << 4) {
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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}
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if (n & 1 << 3) {
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*u.ulp++ = 0;
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*u.ulp++ = 0;
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}
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if (n & 1 << 2)
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*u.ulp++ = 0;
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if (n & 1 << 1) {
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*u.ucp++ = 0;
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*u.ucp++ = 0;
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}
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if (n & 1)
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*u.ucp++ = 0;
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}
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static inline __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
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size_t __n)
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{
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int i = 0;
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unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
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for (i = __n >> 3; i > 0; i--) {
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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}
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if (__n & 1 << 2) {
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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*d++ = *s++;
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}
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if (__n & 1 << 1) {
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*d++ = *s++;
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*d++ = *s++;
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}
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if (__n & 1)
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*d++ = *s++;
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return __dest;
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}
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/*
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* gzip delarations
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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[WSIZE]; /* 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 void gzip_mark(void **);
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static void gzip_release(void **);
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extern char input_data[];
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extern char input_data_end[];
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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 *malloc(int size);
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static void free(void *where);
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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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static void puts(const char *);
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extern int end;
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static ulg free_mem_ptr;
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static ulg free_mem_ptr_end;
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#define HEAP_SIZE 0x2000
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#include "../../../../lib/inflate.c"
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#ifndef STANDALONE_DEBUG
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static void *malloc(int size)
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{
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void *p;
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if (size <0) error("Malloc error");
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if (free_mem_ptr <= 0) error("Memory error");
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free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
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p = (void *)free_mem_ptr;
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free_mem_ptr += size;
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if (free_mem_ptr >= free_mem_ptr_end)
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error("Out of memory");
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return p;
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}
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static void free(void *where)
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{ /* gzip_mark & gzip_release do the free */
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}
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static void gzip_mark(void **ptr)
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{
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arch_decomp_wdog();
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*ptr = (void *) free_mem_ptr;
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}
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static void gzip_release(void **ptr)
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{
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arch_decomp_wdog();
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free_mem_ptr = (long) *ptr;
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}
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#else
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static void gzip_mark(void **ptr)
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{
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}
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static void gzip_release(void **ptr)
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{
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}
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#endif
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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_end[0] - &input_data[0];
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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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int ptr;
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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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#ifndef STANDALONE_DEBUG
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ulg
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decompress_kernel(ulg output_start, ulg free_mem_ptr_p, ulg free_mem_ptr_end_p,
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int arch_id)
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{
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output_data = (uch *)output_start; /* Points to kernel start */
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free_mem_ptr = free_mem_ptr_p;
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free_mem_ptr_end = free_mem_ptr_end_p;
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__machine_arch_type = arch_id;
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arch_decomp_setup();
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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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#else
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char output_buffer[1500*1024];
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int main()
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{
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output_data = output_buffer;
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makecrc();
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puts("Uncompressing Linux...");
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gunzip();
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puts("done.\n");
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return 0;
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}
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#endif
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