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/*
 * 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
 */
 
#include <asm/segment.h>
#include <asm/arch/uncompress.h>
#include <asm/proc/uncompress.h>
 
#ifdef STANDALONE_DEBUG
#define puts printf
#endif
 
#define __ptr_t void *
 
/*
 * Optimised C version of memzero for the ARM.
 */
extern __inline__ __ptr_t __memzero (__ptr_t s, size_t n)
{
	union { void *vp; unsigned long *ulp; unsigned char *ucp; } u;
	int i;
 
	u.vp = s;
 
	for (i = n >> 5; i > 0; i--) {
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
	}
 
	if (n & 1 << 4) {
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
		*u.ulp++ = 0;
	}
 
	if (n & 1 << 3) {
		*u.ulp++ = 0;
		*u.ulp++ = 0;
	}
 
	if (n & 1 << 2)
		*u.ulp++ = 0;
 
	if (n & 1 << 1) {
		*u.ucp++ = 0;
		*u.ucp++ = 0;
	}
 
	if (n & 1)
		*u.ucp++ = 0;
	return s;
}
 
#define memzero(s,n) __memzero(s,n)
 
extern __inline__ __ptr_t memcpy(__ptr_t __dest, __const __ptr_t __src,
			    size_t __n)
{
	int i = 0;
	unsigned char *d = (unsigned char *)__dest, *s = (unsigned char *)__src;
 
	for (i = __n >> 3; i > 0; i--) {
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
	}
 
	if (__n & 1 << 2) {
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
		*d++ = *s++;
	}
 
	if (__n & 1 << 1) {
		*d++ = *s++;
		*d++ = *s++;
	}
 
	if (__n & 1)
		*d++ = *s++;
 
	return __dest;
}
 
/*
 * gzip delarations
 */
#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[WSIZE];	/* 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 void gzip_mark(void **);
static void gzip_release(void **);
 
extern char input_data[], input_end[];
 
static uch *output_data;
static ulg output_ptr;
static ulg bytes_out;
 
static void *malloc(int size);
static void free(void *where);
static void error(char *m);
static void gzip_mark(void **);
static void gzip_release(void **);
 
static void puts(const char *);
 
extern int end;
static ulg free_mem_ptr;
static ulg free_mem_ptr_end;
 
#define HEAP_SIZE 0x2000
 
#include "../../../../lib/inflate.c"
 
#ifndef STANDALONE_DEBUG
static void *malloc(int size)
{
	void *p;
 
	if (size <0) error("Malloc error\n");
	if (free_mem_ptr <= 0) error("Memory error\n");
 
	free_mem_ptr = (free_mem_ptr + 3) & ~3;	/* Align */
 
	p = (void *)free_mem_ptr;
	free_mem_ptr += size;
 
	if (free_mem_ptr >= free_mem_ptr_end)
		error("Out of memory");
	return p;
}
 
static void free(void *where)
{ /* gzip_mark & gzip_release do the free */
}
 
static void gzip_mark(void **ptr)
{
	*ptr = (void *) free_mem_ptr;
}
 
static void gzip_release(void **ptr)
{
	free_mem_ptr = (long) *ptr;
}
#else
static void gzip_mark(void **ptr)
{
}
 
static void gzip_release(void **ptr)
{
}
#endif
 
/* ===========================================================================
 * Fill the input buffer. This is called only when the buffer is empty
 * and at least one byte is really needed.
 */
int fill_inbuf()
{
	if (insize != 0)
		error("ran out of input data\n");
 
	inbuf = input_data;
	insize = input_end - input_data;
	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()
{
	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;
}
 
static void error(char *x)
{
	int ptr;
 
	puts("\n\n");
	puts(x);
	puts("\n\n -- System halted");
 
	while(1);	/* Halt */
}
 
#define STACK_SIZE (4096)
 
ulg user_stack [STACK_SIZE];
 
#ifndef STANDALONE_DEBUG
 
ulg decompress_kernel(ulg output_start)
{
	free_mem_ptr = (ulg)&end;
	free_mem_ptr_end = output_start;
 
	proc_decomp_setup ();
	arch_decomp_setup ();
 
	output_data = (uch *)output_start;	/* Points to kernel start */
 
	makecrc();
	puts("Uncompressing Linux...");
	gunzip();
	puts("done.\nNow booting the kernel\n");
	return output_ptr;
}
#else
 
char output_buffer[1024*1024];
 
int main()
{
	output_data = output_buffer;
 
	makecrc();
	puts("Uncompressing Linux...");
	gunzip();
	puts("done.\n");
	return 0;
}
#endif