xsys0.s

这是一个符合posix.13 pse51的实时内核

/* Project: 	HARTIK 3.0      				*/
/* Description: Hard Real TIme Kernel for 386 & higher machines */
/* Author:	Gerardo Lamastra				*/
/* Date:	9/5/96 						*/
/* Revision:	Beta 1.0					*/


/* Assembler portion of the library! */

/* Use X standard GDT selectors */
#include "sel.h"

.text

.globl __exit
.globl __x_callBIOS
#ifdef __NO_INLINE_PORT__
.globl _outp
.globl _inp
.globl _outpw
.globl _inpw
.globl _outpd
.globl _inpd
#endif

/* Simple function to terminate PM application	*/

/* void _exit(int code)				*/

__exit:		pushl	%ebp
		movl	%esp,%ebp			
		movl	8(%ebp),%eax
		.byte	0x0ea		   /* Direct gate jmp */
		.long	0  
		.word	X_RM_BACK_GATE

/* Invoke 16 bit BIOS function from PM application */

/* void _x_callBIOS(void) */

__x_callBIOS:	.byte	0x09a		   /* Direct gate call */
		.long	0		  
		.word	X_CALLBIOS_GATE
		ret

#ifdef __NO_INLINE_PORT__
/* void outp(int port,char value) */

_outp:		movl	4(%esp),%edx
		movl	8(%esp),%eax
		outb	%al,%dx
		ret

/* char inp(int port) */

_inp:		movl	4(%esp),%edx
		inb	%dx,%al
		movzb	%al,%eax
		ret

/* void outpw(int port,unsigned short value) */

_outpw:		movl	4(%esp),%edx
		movl	8(%esp),%eax
		outw	%ax,%dx
		ret

/* unsigned short inpw(int port) */

_inpw:		movl	4(%esp),%edx
		inw	%dx,%ax
		movzwl	%ax,%eax
		ret
/* void outpd(int port,unsigned long value) */

_outpd:		movl	4(%esp),%edx
		movl	8(%esp),%eax
		outl	%eax,%dx
		ret

/* unsigned long inpd(int port) */

_inpd:		movl	4(%esp),%edx
		inl	%dx,%eax
		ret
#endif	/* __NO_INLINE_PORTS__ */