在xinu中显示中断128 0x80

时间:2015-01-12 20:32:46

标签: c assembly operating-system system-calls interrupt-handling

我需要你的帮助,我想改变xinu(os)的工作方式,所以它将接管中断128并控制SYS_CALL,例如,而不是调用send(pid,msg)我将调用sys_call(发送,pid,msg);. 在initiali.c我添加了

  

mapinit(INT80VEC,active80,INT80VEC);

在标题中,我做了

#ifndef hw4
#define hw4 256 //prevent rerun of the header file

#define INT80VEC 0x80
extern enum cmd{CHPRIO, GETPID, GETPRIO, KILL, RECEIVE, 
            RECVCLR, RESUME, SCOUNT, SCREATE, SDELETE, 
            SEND, SENDF, SENDN, SIGNAL, SIGNALN, SLEEP, 
            SLEEPT, SRESET, SUSPEND, WAIT, PCOUNT, PCREATE,last};
//last is just to find out how many arguments we have in the enum expression

extern SYSCALL sys_call(int sys_call_no, int parm1, int parm2);
extern int active80();

#endif

我得到的c文件:

#include <kernel.h>
#include <conf.h>
#include "my.h"



SYSCALL sys_call(int sys_call_no, int parm1, int parm2){

int ps;
int temp;
disable(ps);
if(sys_call_no<0 ||sys_call_no>=last){
        restore(ps);
        return SYSERR;
}
asm{    mov ax,sys_call_no
        mov bx,parm1
        mov cx,parm2
        int 80h
        mov temp,ax
} 
restore(ps);
return temp;
}

INTPROC active80(){
int sys_call_no, parm1,parm2;
asm{    mov sys_call_no,ax
        mov parm1,bx
        mov parm2,cx
}
switch (sys_call_no) {
case CHPRIO:
    chprio(parm1,parm2);
    break;
case GETPID:
    getpid();
    break;
case GETPRIO:
    getprio(parm1);
    break;
case KILL:
    kill(parm1);
    break;
case RECEIVE:
    receive();
    break;
case RECVCLR:
    recvclr();
    break;
case RESUME:
    resume(parm1);
    break;
case SCOUNT:
    scount(parm1);
    break;
case SCREATE:
    screate(parm1);
    break;
case SDELETE:
    sdelete(parm1);
    break;
case SEND:
    send(parm1, parm2);
    break;
case SENDF:
    sendf(parm1, parm2);
    break;
case SENDN:
    sendn(parm1, parm2);
    break;
case SIGNAL:
    signal(parm1);
    break;
case SIGNALN:
    signaln(parm1,parm2);
    break;
case SLEEP:
    sleep(parm1);
    break;
case SLEEPT:
    sleept(parm1);
    break;
case SRESET:
    sreset(parm1,parm2);
    break;
case SUSPEND:
    suspend(parm1);
    break;
case WAIT:
    wait(parm1);
    break;
case PCOUNT:
    pcount(parm1);
    break;
case PCREATE:
    pcreate(parm1);
    break;
}
return OK;
}
某事不起作用......任何想法? 谢谢你!

2 个答案:

答案 0 :(得分:0)

经过认真挖掘和阅读大量材料后,答案是: 任何proc都有自己的寄存器和堆栈,所以一种方法是创建一个procs数组并从proctab中取出pregs并用它初始化数组,另一种方法是创建处理它的全局变量,这就是多少较慢,因为寄存器是最快的解决方案,但它仍然可以工作

答案 1 :(得分:0)

您必须使用maprestore功能恢复旧的isr。