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/*
* sysctl.c
*
* Created on: 2014-4-26
* Author: Tuowen
*/
#include<msp430g2553.h>
#include"sysctl.h"
syshdlr sysarr[8];
volatile unsigned char syscall=0;
void sysctl_void()
{
// This is the default routine
// I don't want some monkey just come and call some random places in the text!!!!!
}
void sysroutine()
// << Drawback: interrupt may happen between else and CPUOFF
// Critical section -> unlikely to have a race condition
{
if (!syscall)
_BIS_SR(CPUOFF);
switch ((syscall & (-syscall))) // This is used to get the lowest bit
{
case SYS_BIT7:
syscall=syscall&(~SYS_BIT7);
sysarr[7]();
break;
case SYS_BIT6:
syscall=syscall&(~SYS_BIT6);
sysarr[6]();
break;
case SYS_BIT5:
syscall=syscall&(~SYS_BIT5);
sysarr[5]();
break;
case SYS_BIT4:
syscall=syscall&(~SYS_BIT4);
sysarr[4]();
break;
case SYS_BIT3:
syscall=syscall&(~SYS_BIT3);
sysarr[3]();
break;
case SYS_BIT2:
syscall=syscall&(~SYS_BIT2);
sysarr[2]();
break;
case SYS_BIT1:
syscall=syscall&(~SYS_BIT1);
sysarr[1]();
break;
case SYS_BIT0:
syscall=syscall&(~SYS_BIT0);
sysarr[0]();
break;
}
}
inline int sys_b2i(int bit)
{
int i=0;
while (bit>1){bit>>=1;++i;}
return i;
}
void sysctl_reghdlr(unsigned int bit,syshdlr rot)
{
bit=sys_b2i(bit);
sysarr[bit]=rot;
}
void sysctl_rmhdlr(unsigned int bit)
{
bit=sys_b2i(bit);
sysarr[bit]=&sysctl_void;
}
void sysctl_init()
{
unsigned int i;
for (i=0;i<8;++i)
sysarr[i]=&sysctl_void;
}
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