//----------------------------------------------------------------
//	channels.h
//
//	This file defines some constants used by our 'channels.c'
//	module, and by any application that invokes its services. 
//	Repetitive assembly-language statements have been removed
//	in this revision following a suggestion by Matt Ketterer. 
//
//	programmer: ALLAN CRUSE
//	written on: 08 NOV 2004
//	revised on: 10 NOV 2004 -- as suggested by Matt Ketterer 
//----------------------------------------------------------------

#include <asm/unistd.h>		// for __NR_break

#define OBSOLETE_ID	__NR_break
#define INFO_LENGTH	1024

enum { CHAN_MAKE, CHAN_OPEN, CHAN_POST, CHAN_PEND, CHAN_SHUT, CHAN_KILL };


#ifndef __KERNEL__

//-------------------
// service functions 
//-------------------

int chan_common_entry( int cmd, int key, char *buf, int len )
{
	int	retval;

	asm(" movl %0, %%eax " : : "i" (OBSOLETE_ID) );
	asm(" movl %0, %%ebx " : : "m" (cmd) );
	asm(" movl %0, %%ecx " : : "m" (key) );
	asm(" movl %0, %%edx " : : "m" (buf) );
	asm(" movl %0, %%esi " : : "m" (len) );
	asm(" int  $0x80 ");
	asm(" movl %%eax, %0 " : "=m" (retval) );
	return	retval;
}


int chan_make( void )
{
	return chan_common_entry( CHAN_MAKE, 0, NULL, 0 );
}

int chan_open( int key )
{
	return chan_common_entry( CHAN_OPEN, key, NULL, 0 );
}

int chan_shut( int key )
{
	return chan_common_entry( CHAN_SHUT, key, NULL, 0 );
}

int chan_kill( int key )
{
	return chan_common_entry( CHAN_KILL, key, NULL, 0 );
}

int chan_post( int key, char *buf, int len )
{
	return chan_common_entry( CHAN_POST, key, buf, len );
}

int chan_pend( int key, char *buf, int len )
{
	return chan_common_entry( CHAN_PEND, key, buf, len );
}

#endif