/* * 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 * puts by Nick Holloway 1993, better puts by Martin Mares 1995 * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996 */#include <linux/linkage.h>#include <linux/vmalloc.h>#include <linux/tty.h>#include <asm/io.h>/* * gzip declarations */#define OF(args)  args#define STATIC static#undef memset#undef memcpy/* * Why do we do this? Don't ask me.. * * Incomprehensible are the ways of bootloaders. */static void* memset(void *, int, size_t);static void* memcpy(void *, __const void *, size_t);#define memzero(s, n)     memset ((s), 0, (n))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 = 0;  /* valid bytes in inbuf */static unsigned inptr = 0;   /* index of next byte to be processed in inbuf */static unsigned outcnt = 0;  /* 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)#endifstatic int  fill_inbuf(void);static void flush_window(void);static void error(char *m);static void gzip_mark(void **);static void gzip_release(void **);  /* * This is set up by the setup-routine at boot-time */static unsigned char *real_mode; /* Pointer to real-mode data */#define EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))#ifndef STANDARD_MEMORY_BIOS_CALL#define ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))#endif#define SCREEN_INFO (*(struct screen_info *)(real_mode+0))extern char input_data[];extern int input_len;static long bytes_out = 0;static uch *output_data;static unsigned long output_ptr = 0; 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 long free_mem_ptr = (long)&end;static long free_mem_end_ptr;#define INPLACE_MOVE_ROUTINE  0x1000#define LOW_BUFFER_START      0x2000#define LOW_BUFFER_MAX       0x90000#define HEAP_SIZE             0x3000static unsigned int low_buffer_end, low_buffer_size;static int high_loaded =0;static uch *high_buffer_start /* = (uch *)(((ulg)&end) + HEAP_SIZE)*/;static char *vidmem = (char *)0xb8000;static int vidport;static int lines, cols;#ifdef CONFIG_MULTIQUADstatic void *xquad_portio = NULL;#endif#include "../../../../lib/inflate.c"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_end_ptr)		error("\nOut of memory\n");	return p;}static void free(void *where){	/* Don't care */}static void gzip_mark(void **ptr){	*ptr = (void *) free_mem_ptr;}static void gzip_release(void **ptr){	free_mem_ptr = (long) *ptr;} static void scroll(void){	int i;	memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );	for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )		vidmem[i] = ' ';}static void puts(const char *s){	int x,y,pos;	char c;	x = SCREEN_INFO.orig_x;	y = SCREEN_INFO.orig_y;	while ( ( c = *s++ ) != '\0' ) {		if ( c == '\n' ) {			x = 0;			if ( ++y >= lines ) {				scroll();				y--;			}		} else {			vidmem [ ( x + cols * y ) * 2 ] = c; 			if ( ++x >= cols ) {				x = 0;				if ( ++y >= lines ) {					scroll();					y--;				}			}		}	}	SCREEN_INFO.orig_x = x;	SCREEN_INFO.orig_y = y;	pos = (x + cols * y) * 2;	/* Update cursor position */	outb_p(14, vidport);	outb_p(0xff & (pos >> 9), vidport+1);	outb_p(15, vidport);	outb_p(0xff & (pos >> 1), vidport+1);}static void* memset(void* s, int c, size_t n){	int i;	char *ss = (char*)s;	for (i=0;i<n;i++) ss[i] = c;	return s;}static void* memcpy(void* __dest, __const void* __src,			    size_t __n){	int i;	char *d = (char *)__dest, *s = (char *)__src;	for (i=0;i<__n;i++) d[i] = s[i];	return __dest;}/* =========================================================================== * Fill the input buffer. This is called only when the buffer is empty * and at least one byte is really needed. */static int fill_inbuf(void){	if (insize != 0) {		error("ran out of input data\n");	}	inbuf = input_data;	insize = input_len;	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.) */static void flush_window_low(void){    ulg c = crc;         /* temporary variable */    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 flush_window_high(void){    ulg c = crc;         /* temporary variable */    unsigned n;    uch *in,  ch;    in = window;    for (n = 0; n < outcnt; n++) {	ch = *output_data++ = *in++;	if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);    }    crc = c;    bytes_out += (ulg)outcnt;    outcnt = 0;}static void flush_window(void){	if (high_loaded) flush_window_high();	else flush_window_low();}static void error(char *x){	puts("\n\n");	puts(x);	puts("\n\n -- System halted");	while(1);	/* Halt */}#define STACK_SIZE (4096)long user_stack [STACK_SIZE];struct {	long * a;	short b;	} stack_start = { & user_stack [STACK_SIZE] , __KERNEL_DS };static void setup_normal_output_buffer(void){#ifdef STANDARD_MEMORY_BIOS_CALL	if (EXT_MEM_K < 1024) error("Less than 2MB of memory.\n");#else	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < 1024) error("Less than 2MB of memory.\n");#endif	output_data = (char *)0x100000; /* Points to 1M */	free_mem_end_ptr = (long)real_mode;}struct moveparams {	uch *low_buffer_start;  int lcount;	uch *high_buffer_start; int hcount;};static void setup_output_buffer_if_we_run_high(struct moveparams *mv){	high_buffer_start = (uch *)(((ulg)&end) + HEAP_SIZE);#ifdef STANDARD_MEMORY_BIOS_CALL	if (EXT_MEM_K < (3*1024)) error("Less than 4MB of memory.\n");#else	if ((ALT_MEM_K > EXT_MEM_K ? ALT_MEM_K : EXT_MEM_K) < (3*1024)) error("Less than 4MB of memory.\n");#endif		mv->low_buffer_start = output_data = (char *)LOW_BUFFER_START;	low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX	  ? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;	low_buffer_size = low_buffer_end - LOW_BUFFER_START;	high_loaded = 1;	free_mem_end_ptr = (long)high_buffer_start;	if ( (0x100000 + low_buffer_size) > ((ulg)high_buffer_start)) {		high_buffer_start = (uch *)(0x100000 + low_buffer_size);		mv->hcount = 0; /* say: we need not to move high_buffer */	}	else mv->hcount = -1;	mv->high_buffer_start = high_buffer_start;}static void close_output_buffer_if_we_run_high(struct moveparams *mv){	if (bytes_out > low_buffer_size) {		mv->lcount = low_buffer_size;		if (mv->hcount)			mv->hcount = bytes_out - low_buffer_size;	} else {		mv->lcount = bytes_out;		mv->hcount = 0;	}}asmlinkage int decompress_kernel(struct moveparams *mv, void *rmode){	real_mode = rmode;	if (SCREEN_INFO.orig_video_mode == 7) {		vidmem = (char *) 0xb0000;		vidport = 0x3b4;	} else {		vidmem = (char *) 0xb8000;		vidport = 0x3d4;	}	lines = SCREEN_INFO.orig_video_lines;	cols = SCREEN_INFO.orig_video_cols;	if (free_mem_ptr < 0x100000) setup_normal_output_buffer();	else setup_output_buffer_if_we_run_high(mv);	makecrc();	puts("Uncompressing Linux... ");	gunzip();	puts("Ok, booting the kernel.\n");	if (high_loaded) close_output_buffer_if_we_run_high(mv);	return high_loaded;}