io.h

小型操作系统,以VC为开发环境,需要boachs调试

/***************************************************************************
**     File name   : io.h
**     Author      : x.cheng
**     Create date :
**
**	  Comments:
**		定义了端口IO和寄存器IO...
**	
**     Revisions:
**     $Log: io.h,v $
**     Revision 1.2  2005/08/02 15:35:11  x.cheng
**     当使用宏ReadPortString从硬盘读数据时，
**     在中断处理中对地址指针的处理有很大的麻烦，及其诡异，不得以，换成了函数
**     WritePortString也同理
**
**     Revision 1.1.1.1  2005/07/27 06:53:15  x.cheng
**     add into repositories
**
**
***************************************************************************/
#ifndef __JCINX_INC_IO_H__
#define __JCINX_INC_IO_H__


/* ports io                */
#define ucInPort(_uiPort) ({	\
	unsigned char ucResult;	\
	__asm__ __volatile__("inb %w1, %b0" : "=a"(ucResult) : "d"(_uiPort));	\
	ucResult;	\
	})

#define vOutPort(_uiPort, _ucData) \
	__asm__ __volatile__("outb %b0, %w1" : :"a"(_ucData), "d"(_uiPort));
/* 带延迟的硬件端口输出输入函数 */
/* 标号是数字 */ 
#define ucInPortDelay(_uiPort) ({	\
	unsigned char ucResult;	\
	__asm__ __volatile__("inb %w1, %b0\n"	\
						"\tjmp	1f\n"	\
						"1:\tjmp 1f\n"	\
						"1:" : "=a" (ucResult) : "d" (_uiPort));	\
	ucResult;	\
	})
#define vOutPortDelay(_uiPort, _ucData) \
	__asm__ __volatile__("outb %b0, %w1\n"	\
			"\tjmp 1f\n"	\
			"1:\tjmp 1f\n"	\
			"1:" : : "a" (_ucData), "d"(_uiPort));

#ifdef __IDE_HD_SRC__
/*ReadPortString,WritePortString，主要是给硬盘用的*/
/*从端口读入一串数据*/
//note: 当我用下面这个宏的时候，内存地址的问题搞得我焦头烂额，没办法只能换函数，还不能
//		是inline函数，shit!
//#define ReadPortString(_uiPort,_pucBuffer,_uiBytes)	
//	__asm__ __volatile__("cld;rep;insw"::"d" (_uiPort),"D" (_pucBuffer),"c" (_uiBytes))
static void ReadPortString(unsigned short uiPort, unsigned char* pucBuffer, unsigned short uiLen)
{
	__asm__ __volatile__("cld;rep;insw"::"d" (uiPort),"D" (pucBuffer),"c" (uiLen/2));
}


/*向端口写入一串数据*/
//						同理
//#define WritePortString(_uiPort,_pucBuffer,_uiBytes) 
//	__asm__ __volatile__("cld;rep;outsw"::"d" (_uiPort),"S" (_pucBuffer),"c" (_uiBytes))
static void WritePortString(unsigned short uiPort, unsigned char* pucBuffer, unsigned short uiLen)
{
//	HexDump(pucBuffer, 12);
	__asm__ __volatile__("cld;rep;outsw"::"d" (uiPort),"S" (pucBuffer),"c" (uiLen/2));
}
#endif


/*register io*/	
#define _CS()	({	\
	unsigned short uiResult;	\
	__asm__ __volatile__("mov %0, %%cs\n" "mov %1, %0\n" "shr %1, 8"	\
						: "a" : "=d"(uiResult));	\
	uiResult;		\
	})
#define _DS()	({	\
	unsigned short uiResult;	\
	__asm__ __volatile__("mov %0, %%ds\n" "mov %1, %0\n" "shr %1, 8"	\
						: "a" : "=d"(uiResult));	\
	uiResult;		\
	})
#define _SS()	({	\
	unsigned short uiResult;	\
	__asm__ __volatile__("mov %0, %%ss\n" "mov %1, %0\n" "shr %1, 8"	\
						: "a" : "=d"(uiResult));	\
	uiResult;		\
	})
#define _FS()	({	\
	unsigned short uiResult;	\
	__asm__ __volatile__("mov %%fs, %%ax" : "=a"(uiResult) : );	\
	uiResult;	\
	})


#define dwReadCR0()	({	\
	unsigned long dwResult;	\
	__asm__ __volatile__("mov %0, CR0" : "=a"(dwResult) : );	\
	dwResult;	\
	})

//! \brief Clear task switch flag.
static inline void vClearTaskSwitchFlag() {
	__asm__ __volatile__ ("clts");
}

//! \brief Set task switch flag.
static inline void vSetTaskSwitchFlag() {
	unsigned int __cr0;

	__asm__ __volatile__ (
		"movl %%cr0, %0\n"
		"or $8, %0\n"
		"movl %0, %%cr0" : "=r"(__cr0));
}


/***************************************
 *为了读cmos中存储的信息, 下面定义的是
 *CMOS地址读函数
 ***************************************/
#define CMOS_Read(Addr)	({	\
	vOutPortDelay(0x70, Addr);	\
	ucInPortDelay(0x71);	\
	})

/*
void	vWriteCR0(DWORD	dwValue);
void	vLGDT (ts_GDTR *pstGDTR);
void	vUpdateCS (WORD	uiNewCS);

_vWriteCR0:
	push	bp
	mov	bp, sp
	mov	eax, [ss:bp+4]	; eax = 32-bit parameter
	mov	CR0, eax
	pop	bp
	retn

_vLGDT:
	push	bp
	mov	bp, sp
	push	bx
	mov	bx, [ss:bp+4]	; ds:bx	= pointer to GDTR struct
	lgdt	[ds:bx]		; load GDTR
	pop	bx
	pop	bp 
	retn

_vUpdateCS:
	push	bp
	mov	bp, sp
	mov	ax, [ss:bp+4]	; ax = new CS
	push	ax		; push segment
;-------------------------------------------
; error: COFF format does not support non-32-bit relocations
;	push	word .1		; push offset 
	retf			; we have a new cs now
.1:
	pop	bp
	retn
*/
#endif /* end of __JCINX_INC_IO_H__ */