352 lines
6.8 KiB
C
352 lines
6.8 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/compiler.h> /* for inline */
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#include <linux/types.h> /* for size_t */
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#include <linux/stddef.h> /* for NULL */
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#include <asm/string.h>
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#ifdef STANDALONE_DEBUG
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#define putstr printf
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#else
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static void putstr(const char *ptr);
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#include <mach/uncompress.h>
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#ifdef CONFIG_DEBUG_ICEDCC
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#if defined(CONFIG_CPU_V6) || defined(CONFIG_CPU_V7)
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c0, c1, 0" : "=r" (status));
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} while (status & (1 << 29));
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asm("mcr p14, 0, %0, c0, c5, 0" : : "r" (ch));
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}
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#elif defined(CONFIG_CPU_XSCALE)
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c14, c0, 0" : "=r" (status));
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} while (status & (1 << 28));
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asm("mcr p14, 0, %0, c8, c0, 0" : : "r" (ch));
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}
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#else
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static void icedcc_putc(int ch)
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{
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int status, i = 0x4000000;
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do {
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if (--i < 0)
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return;
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asm volatile ("mrc p14, 0, %0, c0, c0, 0" : "=r" (status));
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} while (status & 2);
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asm("mcr p14, 0, %0, c1, c0, 0" : : "r" (ch));
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}
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#endif
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#define putc(ch) icedcc_putc(ch)
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#define flush() do { } while (0)
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#endif
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static void putstr(const char *ptr)
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{
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char c;
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while ((c = *ptr++) != '\0') {
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if (c == '\n')
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putc('\r');
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putc(c);
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}
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flush();
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}
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#endif
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#define __ptr_t void *
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#define memzero(s,n) __memzero(s,n)
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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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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 error(char *m);
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static void putstr(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_end_ptr;
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#ifdef STANDALONE_DEBUG
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#define NO_INFLATE_MALLOC
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#endif
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#define ARCH_HAS_DECOMP_WDOG
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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_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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putstr(".");
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}
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#ifndef arch_error
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#define arch_error(x)
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#endif
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static void error(char *x)
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{
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arch_error(x);
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putstr("\n\n");
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putstr(x);
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putstr("\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_end_ptr = 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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putstr("Uncompressing Linux...");
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gunzip();
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putstr(" 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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putstr("Uncompressing Linux...");
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gunzip();
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putstr("done.\n");
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return 0;
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}
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#endif
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