[net-next-2.6.git] / arch / i386 / boot / compressed / misc.c

/*
 * 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/screen_info.h>
#include <asm/io.h>

/*
 * gzip declarations
 */

#define OF(args)  args
#define STATIC static

#undef memset
#undef memcpy
#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)
#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 **);
  
/*
 * This is set up by the setup-routine at boot-time
 */
static unsigned char *real_mode; /* Pointer to real-mode data */

#define RM_EXT_MEM_K   (*(unsigned short *)(real_mode + 0x2))
#ifndef STANDARD_MEMORY_BIOS_CALL
#define RM_ALT_MEM_K   (*(unsigned long *)(real_mode + 0x1e0))
#endif
#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))

extern unsigned 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 *memset(void *s, int c, unsigned n);
static void *memcpy(void *dest, const void *src, unsigned n);

static void putstr(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             0x3000
static 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_X86_NUMAQ
static void * xquad_portio = NULL;
#endif

#include "../../../../lib/inflate.c"

static void *malloc(int size)
{
	void *p;

	if (size <0) error("Malloc error");
	if (free_mem_ptr <= 0) error("Memory error");

	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("Out of memory");

	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 putstr(const char *s)
{
	int x,y,pos;
	char c;

	x = RM_SCREEN_INFO.orig_x;
	y = RM_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--;
				}
			}
		}
	}

	RM_SCREEN_INFO.orig_x = x;
	RM_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, unsigned 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, unsigned 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");
	}

	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)
{
	putstr("\n\n");
	putstr(x);
	putstr("\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] , __BOOT_DS };

static void setup_normal_output_buffer(void)
{
#ifdef STANDARD_MEMORY_BIOS_CALL
	if (RM_EXT_MEM_K < 1024) error("Less than 2MB of memory");
#else
	if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
#endif
	output_data = (unsigned char *)CONFIG_PHYSICAL_START; /* Normally 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 (RM_EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
#else
	if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < (3*1024)) error("Less than 4MB of memory");
#endif	
	mv->low_buffer_start = output_data = (unsigned 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 ( (CONFIG_PHYSICAL_START + low_buffer_size) > ((ulg)high_buffer_start)) {
		high_buffer_start = (uch *)(CONFIG_PHYSICAL_START + 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 (RM_SCREEN_INFO.orig_video_mode == 7) {
		vidmem = (char *) 0xb0000;
		vidport = 0x3b4;
	} else {
		vidmem = (char *) 0xb8000;
		vidport = 0x3d4;
	}

	lines = RM_SCREEN_INFO.orig_video_lines;
	cols = RM_SCREEN_INFO.orig_video_cols;

	if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
	else setup_output_buffer_if_we_run_high(mv);

	makecrc();
	putstr("Uncompressing Linux... ");
	gunzip();
	putstr("Ok, booting the kernel.\n");
	if (high_loaded) close_output_buffer_if_we_run_high(mv);
	return high_loaded;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* misc.c
	3	*
	4	* This is a collection of several routines from gzip-1.0.3
	5	* adapted for Linux.
	6	*
	7	* malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
	8	* puts by Nick Holloway 1993, better puts by Martin Mares 1995
	9	* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
	10	*/
	11
	12	#include <linux/linkage.h>
	13	#include <linux/vmalloc.h>
7e7f358c	14	#include <linux/screen_info.h>
1da177e4 LT	15	#include <asm/io.h>
	16
	17	/*
	18	* gzip declarations
	19	*/
	20
	21	#define OF(args) args
	22	#define STATIC static
	23
	24	#undef memset
	25	#undef memcpy
1da177e4 LT	26	#define memzero(s, n) memset ((s), 0, (n))
	27
	28	typedef unsigned char uch;
	29	typedef unsigned short ush;
	30	typedef unsigned long ulg;
	31
	32	#define WSIZE 0x8000 /* Window size must be at least 32k, */
	33	/* and a power of two */
	34
	35	static uch inbuf; / input buffer */
	36	static uch window[WSIZE]; /* Sliding window buffer */
	37
	38	static unsigned insize = 0; /* valid bytes in inbuf */
	39	static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
	40	static unsigned outcnt = 0; /* bytes in output buffer */
	41
	42	/* gzip flag byte */
	43	#define ASCII_FLAG 0x01 /* bit 0 set: file probably ASCII text */
	44	#define CONTINUATION 0x02 /* bit 1 set: continuation of multi-part gzip file */
	45	#define EXTRA_FIELD 0x04 /* bit 2 set: extra field present */
	46	#define ORIG_NAME 0x08 /* bit 3 set: original file name present */
	47	#define COMMENT 0x10 /* bit 4 set: file comment present */
	48	#define ENCRYPTED 0x20 /* bit 5 set: file is encrypted */
	49	#define RESERVED 0xC0 /* bit 6,7: reserved */
	50
	51	#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
	52
	53	/* Diagnostic functions */
	54	#ifdef DEBUG
	55	# define Assert(cond,msg) {if(!(cond)) error(msg);}
	56	# define Trace(x) fprintf x
	57	# define Tracev(x) {if (verbose) fprintf x ;}
	58	# define Tracevv(x) {if (verbose>1) fprintf x ;}
	59	# define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
	60	# define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
	61	#else
	62	# define Assert(cond,msg)
	63	# define Trace(x)
	64	# define Tracev(x)
	65	# define Tracevv(x)
	66	# define Tracec(c,x)
	67	# define Tracecv(c,x)
	68	#endif
	69
	70	static int fill_inbuf(void);
	71	static void flush_window(void);
	72	static void error(char *m);
	73	static void gzip_mark(void **);
	74	static void gzip_release(void **);
	75
	76	/*
	77	* This is set up by the setup-routine at boot-time
	78	*/
	79	static unsigned char real_mode; / Pointer to real-mode data */
	80
	81	#define RM_EXT_MEM_K ((unsigned short )(real_mode + 0x2))
	82	#ifndef STANDARD_MEMORY_BIOS_CALL
	83	#define RM_ALT_MEM_K ((unsigned long )(real_mode + 0x1e0))
	84	#endif
	85	#define RM_SCREEN_INFO ((struct screen_info )(real_mode+0))
	86
b79c4df7	87	extern unsigned char input_data[];
1da177e4 LT	88	extern int input_len;
	89
	90	static long bytes_out = 0;
	91	static uch *output_data;
	92	static unsigned long output_ptr = 0;
	93
	94	static void *malloc(int size);
	95	static void free(void *where);
	96
b79c4df7 CDH	97	static void memset(void s, int c, unsigned n);
	98	static void memcpy(void dest, const void *src, unsigned n);
	99
1da177e4 LT	100	static void putstr(const char *);
	101
	102	extern int end;
	103	static long free_mem_ptr = (long)&end;
	104	static long free_mem_end_ptr;
	105
	106	#define INPLACE_MOVE_ROUTINE 0x1000
	107	#define LOW_BUFFER_START 0x2000
	108	#define LOW_BUFFER_MAX 0x90000
	109	#define HEAP_SIZE 0x3000
	110	static unsigned int low_buffer_end, low_buffer_size;
	111	static int high_loaded =0;
	112	static uch high_buffer_start / = (uch )(((ulg)&end) + HEAP_SIZE)/;
	113
	114	static char vidmem = (char )0xb8000;
	115	static int vidport;
	116	static int lines, cols;
	117
	118	#ifdef CONFIG_X86_NUMAQ
	119	static void * xquad_portio = NULL;
	120	#endif
	121
	122	#include "../../../../lib/inflate.c"
	123
	124	static void *malloc(int size)
	125	{
	126	void *p;
	127
	128	if (size <0) error("Malloc error");
	129	if (free_mem_ptr <= 0) error("Memory error");
	130
	131	free_mem_ptr = (free_mem_ptr + 3) & ~3; /* Align */
	132
	133	p = (void *)free_mem_ptr;
	134	free_mem_ptr += size;
	135
	136	if (free_mem_ptr >= free_mem_end_ptr)
	137	error("Out of memory");
	138
	139	return p;
	140	}
	141
	142	static void free(void *where)
	143	{ /* Don't care */
	144	}
	145
	146	static void gzip_mark(void **ptr)
	147	{
	148	ptr = (void ) free_mem_ptr;
	149	}
	150
	151	static void gzip_release(void **ptr)
	152	{
	153	free_mem_ptr = (long) *ptr;
	154	}
	155
	156	static void scroll(void)
	157	{
	158	int i;
	159
	160	memcpy ( vidmem, vidmem + cols * 2, ( lines - 1 ) * cols * 2 );
	161	for ( i = ( lines - 1 ) * cols * 2; i < lines * cols * 2; i += 2 )
	162	vidmem[i] = ' ';
	163	}
164
165	static void putstr(const char *s)
166	{
167	int x,y,pos;
168	char c;
169
170	x = RM_SCREEN_INFO.orig_x;
171	y = RM_SCREEN_INFO.orig_y;
172
173	while ( ( c = *s++ ) != '\0' ) {
174	if ( c == '\n' ) {
175	x = 0;
176	if ( ++y >= lines ) {
177	scroll();
178	y--;
179	}
180	} else {
181	vidmem [ ( x + cols * y ) * 2 ] = c;
182	if ( ++x >= cols ) {
183	x = 0;
184	if ( ++y >= lines ) {
185	scroll();
186	y--;
187	}
188	}
189	}
190	}
191
192	RM_SCREEN_INFO.orig_x = x;
193	RM_SCREEN_INFO.orig_y = y;
194
195	pos = (x + cols * y) * 2; /* Update cursor position */
196	outb_p(14, vidport);
197	outb_p(0xff & (pos >> 9), vidport+1);
198	outb_p(15, vidport);
199	outb_p(0xff & (pos >> 1), vidport+1);
200	}
201
b79c4df7	202	static void* memset(void* s, int c, unsigned n)
1da177e4 LT	203	{
	204	int i;
	205	char ss = (char)s;
	206
	207	for (i=0;i<n;i++) ss[i] = c;
	208	return s;
	209	}
	210
b79c4df7	211	static void* memcpy(void* dest, const void* src, unsigned n)
1da177e4 LT	212	{
1da177e4 LT	213	int i;
b79c4df7	214	char d = (char )dest, s = (char )src;
1da177e4	215
b79c4df7 CDH	216	for (i=0;i<n;i++) d[i] = s[i];
b79c4df7 CDH	217	return dest;
1da177e4 LT	218	}
	219
	220	/* ===========================================================================
	221	* Fill the input buffer. This is called only when the buffer is empty
	222	* and at least one byte is really needed.
	223	*/
	224	static int fill_inbuf(void)
	225	{
	226	if (insize != 0) {
	227	error("ran out of input data");
	228	}
	229
	230	inbuf = input_data;
	231	insize = input_len;
	232	inptr = 1;
	233	return inbuf[0];
	234	}
	235
	236	/* ===========================================================================
	237	* Write the output window window[0..outcnt-1] and update crc and bytes_out.
	238	* (Used for the decompressed data only.)
	239	*/
	240	static void flush_window_low(void)
	241	{
	242	ulg c = crc; /* temporary variable */
	243	unsigned n;
	244	uch in, out, ch;
	245
	246	in = window;
	247	out = &output_data[output_ptr];
	248	for (n = 0; n < outcnt; n++) {
	249	ch = out++ = in++;
	250	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	251	}
	252	crc = c;
	253	bytes_out += (ulg)outcnt;
	254	output_ptr += (ulg)outcnt;
	255	outcnt = 0;
	256	}
	257
	258	static void flush_window_high(void)
	259	{
	260	ulg c = crc; /* temporary variable */
	261	unsigned n;
	262	uch *in, ch;
	263	in = window;
	264	for (n = 0; n < outcnt; n++) {
	265	ch = output_data++ = in++;
	266	if ((ulg)output_data == low_buffer_end) output_data=high_buffer_start;
	267	c = crc_32_tab[((int)c ^ ch) & 0xff] ^ (c >> 8);
	268	}
	269	crc = c;
	270	bytes_out += (ulg)outcnt;
	271	outcnt = 0;
	272	}
	273
	274	static void flush_window(void)
	275	{
	276	if (high_loaded) flush_window_high();
	277	else flush_window_low();
	278	}
	279
	280	static void error(char *x)
	281	{
282	putstr("\n\n");
283	putstr(x);
284	putstr("\n\n -- System halted");
285
286	while(1); /* Halt */
287	}
288
289	#define STACK_SIZE (4096)
290
291	long user_stack [STACK_SIZE];
292
293	struct {
294	long * a;
295	short b;
296	} stack_start = { & user_stack [STACK_SIZE] , __BOOT_DS };
297
298	static void setup_normal_output_buffer(void)
299	{
300	#ifdef STANDARD_MEMORY_BIOS_CALL
301	if (RM_EXT_MEM_K < 1024) error("Less than 2MB of memory");
302	#else
303	if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
304	#endif
2a43f3ed	305	output_data = (unsigned char )CONFIG_PHYSICAL_START; / Normally Points to 1M */
1da177e4 LT	306	free_mem_end_ptr = (long)real_mode;
	307	}
	308
	309	struct moveparams {
	310	uch *low_buffer_start; int lcount;
	311	uch *high_buffer_start; int hcount;
	312	};
	313
	314	static void setup_output_buffer_if_we_run_high(struct moveparams *mv)
	315	{
	316	high_buffer_start = (uch *)(((ulg)&end) + HEAP_SIZE);
	317	#ifdef STANDARD_MEMORY_BIOS_CALL
	318	if (RM_EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
	319	#else
b79c4df7	320	if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < (3*1024)) error("Less than 4MB of memory");
1da177e4	321	#endif
b79c4df7	322	mv->low_buffer_start = output_data = (unsigned char *)LOW_BUFFER_START;
1da177e4 LT	323	low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX
	324	? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;
	325	low_buffer_size = low_buffer_end - LOW_BUFFER_START;
	326	high_loaded = 1;
	327	free_mem_end_ptr = (long)high_buffer_start;
2a43f3ed EB	328	if ( (CONFIG_PHYSICAL_START + low_buffer_size) > ((ulg)high_buffer_start)) {
2a43f3ed EB	329	high_buffer_start = (uch *)(CONFIG_PHYSICAL_START + low_buffer_size);
1da177e4 LT	330	mv->hcount = 0; /* say: we need not to move high_buffer */
	331	}
	332	else mv->hcount = -1;
	333	mv->high_buffer_start = high_buffer_start;
	334	}
	335
	336	static void close_output_buffer_if_we_run_high(struct moveparams *mv)
	337	{
	338	if (bytes_out > low_buffer_size) {
	339	mv->lcount = low_buffer_size;
	340	if (mv->hcount)
	341	mv->hcount = bytes_out - low_buffer_size;
	342	} else {
	343	mv->lcount = bytes_out;
	344	mv->hcount = 0;
	345	}
	346	}
	347
1da177e4 LT	348	asmlinkage int decompress_kernel(struct moveparams mv, void rmode)
	349	{
	350	real_mode = rmode;
	351
	352	if (RM_SCREEN_INFO.orig_video_mode == 7) {
	353	vidmem = (char *) 0xb0000;
	354	vidport = 0x3b4;
	355	} else {
	356	vidmem = (char *) 0xb8000;
	357	vidport = 0x3d4;
	358	}
	359
	360	lines = RM_SCREEN_INFO.orig_video_lines;
	361	cols = RM_SCREEN_INFO.orig_video_cols;
	362
	363	if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
	364	else setup_output_buffer_if_we_run_high(mv);
	365
	366	makecrc();
	367	putstr("Uncompressing Linux... ");
	368	gunzip();
	369	putstr("Ok, booting the kernel.\n");
	370	if (high_loaded) close_output_buffer_if_we_run_high(mv);
	371	return high_loaded;
	372	}