low.c

DOS_PCI_DRIVER,DOS环境下运行的PCI驱动程序,个人觉得比较好用.

	if(XMSExist())
	{
		safe_printf("Xms not exist\n");
		return;
	}

	if(XMS_Alloc(LOG_SIZE,&XmsHandle))
	{
		safe_printf("Xms can not alloc\n");
		return;
	}

	if(XMS_Lock(XmsHandle,&AbsAddr))
	{
		safe_printf("Xms can not Lock\n");
		return;
	}

	old_flush_handler = _dos_getvect(FLUSH_IRQ);

	_dos_setvect(FLUSH_IRQ,new_flush_handler);

	BeginCount = begin_count;
	EndCount = end_count;
}

void CleanupLog(void)
{
	if(XMS_Unlock(XmsHandle))
		return;

	XMS_Free(XmsHandle);

	XmsHandle = 0;

	if(old_flush_handler)
	{
		_dos_setvect(FLUSH_IRQ,old_flush_handler);
		old_flush_handler = NULL;
	}
}

#pragma check_stack(off)

long XMS_LoadFromXMS(unsigned short MemHandle, unsigned long lOffset,
	unsigned char far * pcStr, short Length)
{
   struct XMSSTRU sXmsMove;

   if (Length <= 0) 
	   return -EINVAL;

   sXmsMove.lLength = (unsigned long)Length;
   sXmsMove.iSrcHandle = MemHandle;
   sXmsMove.lSrcOff = lOffset;
   sXmsMove.lDestOff = (unsigned long)FP_SEG(pcStr) * 65536L;
   sXmsMove.lDestOff += (unsigned long)FP_OFF(pcStr);
   sXmsMove.iDestHandle = 0;

   return(XMS_Move(&sXmsMove));
}

void FlushLog(void)
{
	char far * buf;
	FILE * fp;
	unsigned long size; 
	unsigned long len;
		
	if(LoggedSize)
	{
		buf = malloc(4096L);
		if(!buf)
			return;

		fp = fopen(LogFileName,"w");
		if(!fp)
		{
			free(buf);
			return;
		}

		fclose(fp);

		fp = fopen(LogFileName,"ab+");
		if(!fp)
		{
			free(buf);
			return;
		}

		size = 0;
		len = BUF_SIZE;
		for(size = 0;size <= LoggedSize;size += BUF_SIZE)
		{
			if(size + BUF_SIZE >= LoggedSize)
				len = LoggedSize - size;

			if(XMS_LoadFromXMS(XmsHandle,size,buf,len))
			{
				free(buf);
				fclose(fp);
				return;
			}

			fwrite(buf,len,1,fp);
		}

		free(buf);
		fclose(fp);
	}
}

void UnCheckLog(void)
{
	IsLogChecked = 0;
}

#pragma check_stack(on)

#pragma check_stack(off)

long skip_atoi(char **s)
{
	long i=0;

	while (isdigit(**s))
		i = i * 10 + *((*s)++) - '0';

	return i;
}

unsigned do_div(unsigned long * pnum,unsigned short base)
{
	unsigned long num;
	unsigned long count;

	num = *pnum;
	
	if(num < base)
	{
		*pnum = 0;
		return num;
	}
	else
	{
		num = *pnum - (unsigned long)((((float)(unsigned long)((float)num / (float)base))
			 * (float)base));
		*pnum = (unsigned long)((float)(*pnum) / (float)base);

		return num;		
	}
}

unsigned long strnlen(char far * string,unsigned long count)
{
	unsigned long i;

	for(i = 0;i < count && *string;++i)
	{
		++string;
	}

	return i;
}

char * number(char * buf, char * end, long num, long base, long size, long precision, 
	long type)
{
	char c,sign,tmp[66];
	const char *digits;
	const char small_digits[] = "0123456789abcdefghijklmnopqrstuvwxyz";
	const char large_digits[] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
	long i;

	digits = (type & LARGE) ? large_digits : small_digits;
	if (type & LEFT)
		type &= ~ZEROPAD;
	if (base < 2 || base > 36)
		return 0;

	c = (type & ZEROPAD) ? '0' : ' ';
	sign = 0;
	if (type & SIGN) 
	{
		if (num < 0) 
		{
			sign = '-';
			num = -num;
			size--;
		} 
		else if (type & PLUS) 
		{
			sign = '+';
			size--;
		} 
		else if (type & SPACE) 
		{
			sign = ' ';
			size--;
		}
	}

	if (type & SPECIAL) 
	{
		if (base == 16)
			size -= 2;
		else if (base == 8)
			size--;
	}

	i = 0;
	if (num == 0)
		tmp[i++] = '0';
	else
	{		
		while (num != 0)
		{
			tmp[i++] = digits[do_div(&num,base)];
		}
	}

	if (i > precision)
		precision = i;
	size -= precision;
	if (!(type & (ZEROPAD+ LEFT))) 
	{
		while(size-- > 0) 
		{
			if (buf <= end)
				*buf = ' ';
			++buf;
		}
	}

	if (sign) 
	{
		if (buf <= end)
			*buf = sign;
		++buf;
	}

	if (type & SPECIAL) 
	{
		if (base==8) 
		{
			if (buf <= end)
				*buf = '0';
			++buf;
		} 
		else if (base == 16) 
		{
			if (buf <= end)
				*buf = '0';
			++buf;
			if (buf <= end)
				*buf = digits[33];
			++buf;
		}
	}

	if (!(type & LEFT)) 
	{
		while (size-- > 0) 
		{
			if (buf <= end)
				*buf = c;
			++buf;
		}
	}

	while (i < precision--) 
	{
		if (buf <= end)
			*buf = '0';
		++buf;
	}

	while (i-- > 0) 
	{
		if (buf <= end)
			*buf = tmp[i];
		++buf;
	}

	while (size-- > 0) 
	{
		if (buf <= end)
			*buf = ' ';
		++buf;
	}

	return buf;
}

long vsnprintf(char *buf, size_t size, const char *fmt, va_list args)
{
	long len;
	unsigned long num;
	long i, base;
	char *str, *end, c;
	char *s;

	long flags;		/* flags to number() */

	long field_width;	/* width of output field */
	long precision;		/* min. # of digits for integers; max
				   number of chars for from string */
	long qualifier;		/* 'h', 'l', or 'L' for integer fields */
				/* 'z' support added 23/7/1999 S.H.    */
				/* 'z' changed to 'Z' --davidm 1/25/99 */

	str = buf;
	end = buf + size - 1;

	if (end < buf - 1) 
	{
		end = ((void *) -1);
		size = end - buf + 1;
	}

	for (; *fmt ; ++fmt) 
	{
		if (*fmt != '%') 
		{
			if (str <= end)
				*str = *fmt;
			++str;
			continue;
		}

		/* process flags */
		flags = 0;

		repeat:

		++fmt;		/* this also skips first '%' */
		switch (*fmt) 
		{
			case '-': flags |= LEFT; goto repeat;
			case '+': flags |= PLUS; goto repeat;
			case ' ': flags |= SPACE; goto repeat;
			case '#': flags |= SPECIAL; goto repeat;
			case '0': flags |= ZEROPAD; goto repeat;
		}

		/* get field width */
		field_width = -1;

		if (isdigit(*fmt))
			field_width = skip_atoi(&fmt);
		else if (*fmt == '*') 
		{
			++fmt;
			/* it's the next argument */
			field_width = va_arg(args, int);
			if (field_width < 0) 
			{
				field_width = -field_width;
				flags |= LEFT;
			}
		}

		/* get the precision */
		precision = -1;
		if (*fmt == '.') 
		{
			++fmt;	
			if (isdigit(*fmt))
				precision = skip_atoi(&fmt);
			else if (*fmt == '*') 
			{
				++fmt;
				/* it's the next argument */
				precision = va_arg(args, int);
			}
				
			if (precision < 0)
				precision = 0;
		}

		/* get the conversion qualifier */
		qualifier = -1;

		if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L' || *fmt =='Z') 
		{
			qualifier = *fmt;
			++fmt;
			if (qualifier == 'l' && *fmt == 'l') 
			{
				qualifier = 'L';
				++fmt;
			}
		}

		/* default base */
		base = 10;

		switch (*fmt) 
		{
			case 'c':
				if (!(flags & LEFT)) 
				{
					while (--field_width > 0) 
					{
						if (str <= end)
							*str = ' ';
						++str;
					}
				}

				c = (unsigned char) va_arg(args, int);
				if (str <= end)
					*str = c;
				++str;

				while (--field_width > 0) 
				{
					if (str <= end)
						*str = ' ';
					++str;
				}

				continue;

			case 's':
				s = va_arg(args, char *);
				if (!s)
					s = "<NULL>";

				len = strnlen(s, precision);

				if (!(flags & LEFT)) 
				{
					while (len < field_width--) 
					{
						if (str <= end)
							*str = ' ';
						++str;
					}
				}

				for (i = 0; i < len; ++i) 
				{
					if (str <= end)
						*str = *s;
					++str; 
					++s;
				}

				while (len < field_width--) 
				{
					if (str <= end)
						*str = ' ';
					++str;
				}

				continue;

			case 'p':
				if (field_width == -1) 
				{
					field_width = 2 * sizeof(void far *);
					flags |= ZEROPAD;
				}

				str = number(str, end,
					(unsigned long) va_arg(args, void far *),
					16, field_width, precision, flags);

				continue;


			case 'n':
				/* FIXME:
				* What does C99 say about the overflow case here? */
				if (qualifier == 'l') 
				{
					long far * ip = va_arg(args, long far *);
					*ip = (str - buf);
				} 
				else if (qualifier == 'Z') 
				{
					size_t * ip = va_arg(args, size_t *);
					*ip = (str - buf);
				} 
				else 
				{
					int * ip = va_arg(args, int *);
					*ip = (str - buf);
				}

				continue;

			case '%':
				if (str <= end)
					*str = '%';
				++str;
				continue;

				/* integer number formats - set up the flags and "break" */
			case 'o':
				base = 8;
				break;

			case 'X':
				flags |= LARGE;

			case 'x':
				base = 16;
				break;

			case 'd':
			case 'i':

				flags |= SIGN;

			case 'u':
				break;

			default:
				if (str <= end)
					*str = '%';
				++str;

				if (*fmt) 
				{
					if (str <= end)
						*str = *fmt;
					++str;
				} 
				else 
				{
					--fmt;
				}

				continue;
		};

		if (qualifier == 'L')
			num = va_arg(args, long);
		else if (qualifier == 'l') 
		{
			num = va_arg(args, unsigned long);
			if (flags & SIGN)
				num = (signed long) num;
		} 
		else if (qualifier == 'Z') 
		{
			num = va_arg(args, size_t);
		} 
		else if (qualifier == 'h') 
		{
			num = (unsigned short) va_arg(args, int);
			if (flags & SIGN)
				num = (signed short) num;
		} 
		else 
		{
			num = va_arg(args, unsigned int);
			if (flags & SIGN)
				num = (signed int) num;
		}

		str = number(str, end, num, base,
			field_width, precision, flags);
	}

	if (str <= end)
		*str = '\0';
	else if (size > 0)
		/* don't write out a null byte if the buf size is zero */
		*end = '\0';
	/* the trailing null byte doesn't count towards the total
	*++str;
	*/

	return str-buf;
}

long my_vsprintf(char *buf, const char *fmt, va_list args)
{
	return vsnprintf(buf, 0xFFFFFFFFUL, fmt, args);
}

int IsXmsExist(void)
{
	return (iOffset1 || iSeg1);
}

long movexms1(struct XMSSTRU far * psXmsStru)
{
    unsigned short iDs, iSi, iAx;
    unsigned long XmsEntryPoint;

	XmsEntryPoint = ((unsigned long)iSeg1) * 65536L
		+ (unsigned long)iOffset1;

    if (psXmsStru->lLength%2l)
       return -EINVAL;  // must be even

    iDs = FP_SEG((void far *)psXmsStru);
    iSi = FP_OFF((void far *)psXmsStru);

    _asm push ds
    _asm push si
    _asm mov ah, 0x0b
    _asm mov si, iDs
    _asm mov ds, si
    _asm mov si, iSi
    _asm call dword ptr XmsEntryPoint
    _asm pop si
    _asm pop ds
    _asm cmp ax,0
    _asm jz return_error6
    _asm jmp return_success6

    return_error6:
	return -EINVAL;

    return_success6:
	return 0L;
}

long XMS_Move(struct XMSSTRU * psXmsStru)
{
	struct XMSSTRU sStru;
	unsigned char pcChar[2];
	unsigned char far *pcChar1;

	if ( !(psXmsStru->lLength%2L) )  
	   return (movexms1(psXmsStru));

	psXmsStru->lLength--;
	if(movexms1(psXmsStru)) 
	{  
		psXmsStru->lLength++;  
		return -EINVAL;  
	}

   psXmsStru->lLength++;

   if(!psXmsStru->iSrcHandle)  // 从常规内存到 XMS
   {
      sStru.lLength = 2L;
      sStru.iSrcHandle = psXmsStru->iDestHandle;
      sStru.lSrcOff = psXmsStru->lDestOff + psXmsStru->lLength - 1L;
      sStru.iDestHandle = 0;
      sStru.lDestOff = ((unsigned long)FP_SEG(pcChar) << 16) 
		  + (unsigned long)FP_OFF(pcChar);

      if (movexms1(&sStru))  
		  return -EINVAL;

      pcChar1 = (unsigned char far *)MK_FP(psXmsStru->lSrcOff);
      pcChar[0] = pcChar1[psXmsStru->lLength - 1L];

      sStru.lLength = 2L;
      sStru.iSrcHandle = 0;
      sStru.lSrcOff= ((unsigned long)FP_SEG(pcChar) * 65536L) +
		  (unsigned long)FP_OFF(pcChar);
      sStru.iDestHandle = psXmsStru->iDestHandle;
      sStru.lDestOff = psXmsStru->lDestOff + psXmsStru->lLength- 1L;
      if (movexms1(&sStru)) 
		  return -EINVAL;
   }

   if (!psXmsStru->iDestHandle)   // 从 XMS 到常规内存
   {
      sStru.lLength = 2L;
      sStru.iSrcHandle = psXmsStru->iSrcHandle;
      sStru.lSrcOff = psXmsStru->lSrcOff + psXmsStru->lLength -1L;
      sStru.iDestHandle = 0;
      sStru.lDestOff=((unsigned long)FP_SEG(pcChar) * 65536L) +
		  (unsigned long)FP_OFF(pcChar);
      if (movexms1(&sStru)) 
		  return -EINVAL;

      pcChar1 = (unsigned char *)MK_FP(psXmsStru->lDestOff);
      pcChar1[psXmsStru->lLength-1l] = pcChar[0];
   }

   return 0L;
}

long XMS_StoreToXMS(unsigned char far * pcStr, unsigned short MemHandle, 
	unsigned long lOffset, short Length)
{
   struct XMSSTRU sXmsMove;

   if (Length <=0 ) 
	   return -EINVAL;

   sXmsMove.lLength= (unsigned long)Length;
   sXmsMove.iSrcHandle = 0;
   sXmsMove.lSrcOff = (unsigned long)FP_SEG(pcStr) * 65536L;
   sXmsMove.lSrcOff += (unsigned long)FP_OFF(pcStr);
   sXmsMove.iDestHandle = MemHandle;
   sXmsMove.lDestOff = lOffset;

   return(XMS_Move(&sXmsMove));
}

void BeginLog(void)
{
	++PassCount;

	if(XmsHandle && PassCount >= BeginCount && PassCount < EndCount)
	{
		IsLogging = 1;
		_asm sti
	}
}

void EndLog(void)
{
	if(IsLogging && PassCount >= EndCount)
	{
		IsLogChecked = 1;
		IsLogging = 0;
	}
}

#pragma check_stack(on)

#endif

#pragma check_stack(off)

extern unsigned char int1c_is_sti;
extern struct event_item far * int1c_item;
extern unsigned short int1c_temp;

void interrupt far new_int1c_handler(void)
{
	unsigned short temp;

	if(is_in_interrupt)
	    return;

	int1c_temp = 0;

	(* old_int1c_handler)();

	if(!busy)
	{
		busy = 1;

	    	_asm pushf
	    	_asm pop temp

	    	int1c_is_sti = 0;
	    	if(temp & 0x0200)
	    	{			
			_asm cli
			int1c_is_sti = 1;
	    	}

	    	for(int1c_item = event_item_i(global_event_list.next);
			int1c_item != event_item_i(&global_event_list);
	    		int1c_item = event_item_i(int1c_item->node.next))
	    	{
			if(!int1c_item->is_active)
		    	{
				if(int1c_item->event_type == EVENT_TIMER || 
					int1c_item->event_type == EVENT_THREAD)
				{
					++int1c_item->tick_count;

					if(int1c_item->tick_count >= 
						int1c_item->tick_count_limit)
					{
						int1c_item->is_active = 1;
					}
				}
			}
		}

	    	#ifdef DEBUG_HARDWARE_INTERRUPT

			int1c_temp = IsLogChecked;

	    	#endif

	    	if(int1c_is_sti)
	    	{
			_asm cli			
	    	}

	    	busy = 0;
	}

	#ifdef DEBUG_HARDWARE_INTERRUPT
		if(int1c_temp)
		{
			_asm sti
			_asm int FLUSH_IRQ
		}
	#endif
}

#pragma check_stack(on)