arch/i386/boot/compressed/misc.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <video/edid.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)
 #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 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 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, 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");
 	}

 	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 = (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 (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 = (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 (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;
 }
	/*
	* 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 <video/edid.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)
	#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 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 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, 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");
	}

	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 = (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 (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 = (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 (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;
	}