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@ -0,0 +1,572 @@
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/*
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* linux/kernel/sys.c
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*
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* (C) 1991 Linus Torvalds
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*/
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#include <errno.h>
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#include <linux/sched.h> //调度程序头文件。定义了任务结构task_struct,任务0的数据,
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//还有一些有关描述符参数设置和获取的嵌入式汇编函数宏语言
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#include <linux/tty.h>
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#include <linux/kernel.h> //内核头文件
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#include <asm/segment.h>
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#include <sys/times.h>
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#include <sys/utsname.h> //系统名称结构头文件
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#include <asm/io.h>
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#include <fcntl.h>
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int sys_ftime()
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{
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return -ENOSYS;
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}
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int sys_break()
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{
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return -ENOSYS;
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}
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int sys_ptrace()
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{
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return -ENOSYS;
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}
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int sys_stty()
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{
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return -ENOSYS;
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}
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int sys_gtty()
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{
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return -ENOSYS;
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}
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int sys_rename()
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{
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return -ENOSYS;
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}
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int sys_prof()
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{
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return -ENOSYS;
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}
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int sys_setregid(int rgid, int egid)
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{
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if (rgid>0) {
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if ((current->gid == rgid) ||
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suser())
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current->gid = rgid;
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else
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return(-EPERM);
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}
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if (egid>0) {
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if ((current->gid == egid) ||
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(current->egid == egid) ||
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suser()) {
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current->egid = egid;
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current->sgid = egid;
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} else
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return(-EPERM);
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}
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return 0;
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}
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//设置进程组号
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int sys_setgid(int gid)
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{
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/* return(sys_setregid(gid, gid)); */
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if (suser())
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current->gid = current->egid = current->sgid = gid;
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else if ((gid == current->gid) || (gid == current->sgid))
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current->egid = gid;
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else
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return -EPERM;
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return 0;
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}
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int sys_acct()
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{
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return -ENOSYS;
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}
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int sys_phys()
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{
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return -ENOSYS;
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}
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int sys_lock()
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{
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return -ENOSYS;
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}
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int sys_mpx()
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{
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return -ENOSYS;
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}
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int sys_ulimit()
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{
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return -ENOSYS;
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}
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//返回从1970年1月1号 开始记时的时间值(s)
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int sys_time(long * tloc)
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{
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int i;
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i = CURRENT_TIME;
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if (tloc) {
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verify_area(tloc,4);
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put_fs_long(i,(unsigned long *)tloc); //把时间值存储到用户空间
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//段寄存器fs被默认地指向用户数据空间,因此此函数可利用fs段寄存器来访问用户空间中的值
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}
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return i;
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}
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/*
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* Unprivileged users may change the real user id to the effective uid
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* or vice versa.
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*/
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int sys_setreuid(int ruid, int euid)
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{
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int old_ruid = current->uid;
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if (ruid>0) {
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if ((current->euid==ruid) ||
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(old_ruid == ruid) ||
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suser())
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current->uid = ruid;
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else
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return(-EPERM);
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}
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if (euid>0) {
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if ((old_ruid == euid) ||
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(current->euid == euid) ||
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suser()) {
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current->euid = euid;
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current->suid = euid;
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} else {
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current->uid = old_ruid;
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return(-EPERM);
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}
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}
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return 0;
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}
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int sys_setuid(int uid)
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{
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/* return(sys_setreuid(uid, uid)); */
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if (suser())
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current->uid = current->euid = current->suid = uid;
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else if ((uid == current->uid) || (uid == current->suid))
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current->euid = uid;
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else
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return -EPERM;
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return(0);
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}
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int sys_stime(long * tptr)
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{
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if (!suser())
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return -EPERM;
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startup_time = get_fs_long((unsigned long *)tptr) - jiffies/HZ;
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return 0;
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}
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//获取当前任务运行时间统计值
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int sys_times(struct tms * tbuf)
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{
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if (tbuf) {
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verify_area(tbuf,sizeof *tbuf);
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put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime);
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put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime);
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put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime);
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put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime);
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}
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return jiffies;
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}
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//设置程序在内存中的末端位置
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int sys_brk(unsigned long end_data_seg)
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{
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//如果参数值大于代码结尾,并且小于(堆栈-16kb),则设置新数据段结尾值
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if (end_data_seg >= current->end_code &&
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end_data_seg < current->start_stack - 16384)
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current->brk = end_data_seg;
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return current->brk;
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}
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/*
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* This needs some heave checking ...
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* I just haven't get the stomach for it. I also don't fully
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* understand sessions/pgrp etc. Let somebody who does explain it.
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*/
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int sys_setpgid(int pid, int pgid)
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{
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int i;
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if (!pid)
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pid = current->pid;
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if (!pgid)
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pgid = current->pid;
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for (i=0 ; i<NR_TASKS ; i++)
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if (task[i] && task[i]->pid==pid) {
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if (task[i]->leader)
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return -EPERM;
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if (task[i]->session != current->session)
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return -EPERM;
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task[i]->pgrp = pgid;
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return 0;
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}
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return -ESRCH;
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}
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int sys_getpgrp(void)
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{
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return current->pgrp;
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}
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int sys_setsid(void)
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{
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if (current->leader && !suser())
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return -EPERM;
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current->leader = 1;
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current->session = current->pgrp = current->pid;
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current->tty = -1;
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return current->pgrp;
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}
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int sys_getgroups()
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{
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return -ENOSYS;
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}
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int sys_setgroups()
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{
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return -ENOSYS;
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}
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int sys_uname(struct utsname * name)
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{
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static struct utsname thisname = {
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"linux .0","nodename","release ","version ","machine "
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};
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int i;
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if (!name) return -ERROR;
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verify_area(name,sizeof *name);
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for(i=0;i<sizeof *name;i++)
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put_fs_byte(((char *) &thisname)[i],i+(char *) name); //用来访问用户程序的数据
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return 0;
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}
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int sys_sethostname()
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{
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return -ENOSYS;
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}
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int sys_getrlimit()
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{
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return -ENOSYS;
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}
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int sys_setrlimit()
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{
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return -ENOSYS;
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}
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int sys_getrusage()
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{
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return -ENOSYS;
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}
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int sys_gettimeofday()
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{
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return -ENOSYS;
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}
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int sys_settimeofday()
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{
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return -ENOSYS;
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}
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int sys_umask(int mask)
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{
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int old = current->umask;
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current->umask = mask & 0777;
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return (old);
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}
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int sys_pipe2(void){
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return 0;
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}
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int sys_sleep(unsigned int seconds){
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sys_signal(SIGALRM,SIG_IGN);
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sys_alarm(seconds);
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sys_pause();
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return 0;
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}
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// int sys_execve2(){
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// return 0;
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// }
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/*获取目录的目录项*/
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/*fd指目录描述符,dirp指目录信息,count指目录信息大小*/
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int sys_getdents(unsigned int fd,struct linux_dirent *dirp,unsigned int count)
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{
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struct file *file;
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struct m_inode *inode;
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struct buffer_head *bh;
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struct dir_entry *de;
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struct linux_dirent *temp;
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char * buf;
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int i,len = 0,ret = 0;
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if(!count)return -1;
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if(fd>=NR_OPEN)return -1; /*fd超过进程最多打开文件数20*/
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file=current->filp[fd];
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if(!file)return -1;
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inode = file->f_inode;
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temp = (struct linux_dirent *)malloc(sizeof(struct linux_dirent)); //目录信息
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buf = (char*)malloc(sizeof(struct linux_dirent));
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bh = bread(inode->i_dev , inode->i_zone[0]); //读取指向的数据块
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for (;ret<inode->i_size;ret += sizeof(struct dir_entry)){
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if (len >= count-sizeof(struct linux_dirent))
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break;
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de = (struct dir_entry *)(bh->b_data + ret);/*de更新为当前目录项*/
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if (!de->inode )/*如果节点号为空,就退出*/
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continue;
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/*用temp保存当前目录项信息*/
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temp->d_ino = de->inode;
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temp->d_off = 0;
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temp->d_reclen = sizeof(struct linux_dirent);
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strcpy(temp->d_name,de->name);
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/*将数据写回到用户*/
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memcpy(buf, temp, sizeof(struct linux_dirent));
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for (i=0;i < sizeof(struct linux_dirent);i++){
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put_fs_byte(*(buf+i), ((char*)dirp)+len+i); //用来访问用户程序的数据
|
|
|
|
|
}
|
|
|
|
|
len += sizeof(struct linux_dirent);
|
|
|
|
|
}
|
|
|
|
|
return len;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
//参考find_entry
|
|
|
|
|
// int sys_getcwd(char* buf,size_t size){
|
|
|
|
|
// struct buffer_head *bh;
|
|
|
|
|
// struct dir_entry*de,*p_de;
|
|
|
|
|
// unsigned current_depth = 0;
|
|
|
|
|
// struct m_inode* current_ino;
|
|
|
|
|
// struct m_inode* parent_ino;
|
|
|
|
|
// char* t_buf,* tmp;
|
|
|
|
|
// int ret = 0;
|
|
|
|
|
// t_buf = (char*)malloc(256);
|
|
|
|
|
// strcpy(t_buf,"");
|
|
|
|
|
// for(;;){
|
|
|
|
|
// current_ino = namei(".");
|
|
|
|
|
// parent_ino = namei("..");
|
|
|
|
|
// if(current_ino == parent_ino) //找到了根节点
|
|
|
|
|
// break;
|
|
|
|
|
// sys_chdir("..");
|
|
|
|
|
// //read_inode(current_ino); 这是个静态函数
|
|
|
|
|
// //buf[current_depth++] = read_inode(current_ino);//根据节点号,在当前目录查找文件read_inode
|
|
|
|
|
// bh = bread(parent_ino->i_dev,parent_ino->i_zone[0]);
|
|
|
|
|
// for(;ret<parent_ino->i_size;ret+=sizeof(struct dir_entry))
|
|
|
|
|
// {
|
|
|
|
|
// de = (struct dir_entry*)(bh->b_data + ret);
|
|
|
|
|
// if(!de->inode)break;
|
|
|
|
|
// if(de->inode == (current_ino->i_num)){
|
|
|
|
|
// strcpy(tmp,"/");
|
|
|
|
|
// strcat(tmp,de->name);
|
|
|
|
|
// strcat(tmp,t_buf);
|
|
|
|
|
// strcpy(t_buf,tmp);
|
|
|
|
|
// current_depth += NAME_LEN;
|
|
|
|
|
// break;
|
|
|
|
|
// }
|
|
|
|
|
// }
|
|
|
|
|
// //current_depth++;
|
|
|
|
|
// }
|
|
|
|
|
// int i;
|
|
|
|
|
// for(i = 0;t_buf[i];i++){
|
|
|
|
|
// put_fs_byte(t_buf[i],buf+i);
|
|
|
|
|
// }
|
|
|
|
|
// return (int)buf;
|
|
|
|
|
// }
|
|
|
|
|
|
|
|
|
|
#define BUF_MAX 256
|
|
|
|
|
int sys_getcwd(char * buf, size_t size)
|
|
|
|
|
{
|
|
|
|
|
char temp[BUF_MAX], t_buf[BUF_MAX];
|
|
|
|
|
int flag,len;
|
|
|
|
|
struct m_inode *parent_ino,*current_ino,*root;
|
|
|
|
|
struct super_block *sb;
|
|
|
|
|
struct dir_entry *de,*p_de;
|
|
|
|
|
int i;
|
|
|
|
|
sb = (struct super_block *)bread(current->pwd->i_dev,1);
|
|
|
|
|
current_ino = current->pwd;
|
|
|
|
|
root = current->root;
|
|
|
|
|
while(current_ino->i_num != root->i_num)
|
|
|
|
|
{
|
|
|
|
|
de = (struct dir_entry *)bread(current_ino->i_dev,current_ino->i_zone[0])->b_data;
|
|
|
|
|
int de_num = current_ino->i_size/sizeof(struct dir_entry);//当前目录的目录项数量
|
|
|
|
|
flag = 0;
|
|
|
|
|
for(i=0;i<de_num;i++){
|
|
|
|
|
if(!strcmp((de+i)->name,"..")){
|
|
|
|
|
flag = 1;
|
|
|
|
|
parent_ino = iget(current_ino->i_dev,(de + i)->inode); //寻找父目录节点
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if(!flag) {
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
p_de = (struct dir_entry *)bread(parent_ino->i_dev,parent_ino->i_zone[0])->b_data;
|
|
|
|
|
int p_de_num = parent_ino->i_size/sizeof(struct dir_entry); //父目录的目录项数量
|
|
|
|
|
|
|
|
|
|
flag = 0;
|
|
|
|
|
for(i=0;i<p_de_num;i++){
|
|
|
|
|
if((p_de+i)->inode == current_ino->i_num){ //比对当前节点的节点号相同,则记录,并回溯
|
|
|
|
|
memset(temp, 0, sizeof(temp));
|
|
|
|
|
strcat(temp,"/");
|
|
|
|
|
strcat(temp,(p_de+i)->name);
|
|
|
|
|
strcat(temp,t_buf);
|
|
|
|
|
strncpy(t_buf,temp,BUF_MAX);
|
|
|
|
|
flag = 1;
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if(!flag){
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
current_ino = parent_ino;
|
|
|
|
|
}
|
|
|
|
|
for(i=0;i<strlen(t_buf);i++){
|
|
|
|
|
put_fs_byte(t_buf[i],buf+i);
|
|
|
|
|
}
|
|
|
|
|
return (int)buf;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
start:映射起始位置
|
|
|
|
|
len:长度
|
|
|
|
|
prot:映射的内存保护⽅式,可取:PROT_EXEC, PROT_READ, PROT_WRITE, PROT_NONE
|
|
|
|
|
flags:映射是否与其他进程共享的标志,可取:MAP_FILE, MAP_SHARED, MAP_PRIVATE
|
|
|
|
|
fd:⽂件句柄,文件描述符,代表要映射的文件
|
|
|
|
|
off:⽂件偏移量
|
|
|
|
|
返回值:成功返回已映射区域的指针,失败返回-1;
|
|
|
|
|
|
|
|
|
|
内存映射函数mmap, 负责把文件内容映射到进程的虚拟内存空间, 通过对这段内存的读取和修改,
|
|
|
|
|
来实现对文件的读取和修改,而不需要再调用read,write等操作。
|
|
|
|
|
PROT_EXEC: 映射区可被执行
|
|
|
|
|
PROT_READ: 映射区可被读取
|
|
|
|
|
PROT_WRITE: 映射区可被写入
|
|
|
|
|
|
|
|
|
|
MAP_SHARED:写入映射区的数据会复制回文件, 且允许其他映射该文件的进程共享。
|
|
|
|
|
MAP_PRIVATE:对映射区的写入操作会产生一个映射区的复制(copy-on-write),
|
|
|
|
|
对此区域所做的修改不会写回原文件。
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
// typedef struct { unsigned long pgprot; } pgprot_t;
|
|
|
|
|
// struct vm_area_struct{
|
|
|
|
|
// unsigned long vm_start; //虚拟内存起始地址
|
|
|
|
|
// unsigned long vm_end;
|
|
|
|
|
// unsigned long vm_flags; //该区域的标志
|
|
|
|
|
// pgprot_t vm_page_prot;
|
|
|
|
|
// };
|
|
|
|
|
|
|
|
|
|
// int memdev_mmap(struct file*filp,struct vm_area_struct *vma){
|
|
|
|
|
// vma->vm_flags |= VM_IO;
|
|
|
|
|
// vma->vm_flags |= VM_RESEVED;
|
|
|
|
|
// if(remap_pfn_range(vma,vma->vm_start,virt_to_phys(dev->data)>>PAGE_SHIFT,
|
|
|
|
|
// size,vma->vm_page_prot))
|
|
|
|
|
// return -EAGAIN;
|
|
|
|
|
// return 0;
|
|
|
|
|
// }
|
|
|
|
|
|
|
|
|
|
int sys_mmap(void* start,size_t len,int prot,int flags,
|
|
|
|
|
int fd,off_t off){
|
|
|
|
|
return 0;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#define vga_graph_memstart 0xA0000
|
|
|
|
|
#define vga_graph_memsize 64000
|
|
|
|
|
#define cursor_side 6
|
|
|
|
|
#define width 320
|
|
|
|
|
#define height 200
|
|
|
|
|
//#define barrier_width 10
|
|
|
|
|
int volatile jumpp;
|
|
|
|
|
int flag=0;
|
|
|
|
|
int sys_init_graphics()
|
|
|
|
|
{
|
|
|
|
|
int i,j,x,y;
|
|
|
|
|
char *p=vga_graph_memstart;
|
|
|
|
|
x = 20;y = 20;
|
|
|
|
|
if(flag==0)
|
|
|
|
|
{
|
|
|
|
|
/* 图形控制器,拼接器有关寄存器端口是0x3CE和0x3C4 */
|
|
|
|
|
/* 先往寄存器端口写索引号,端口地址下一个写命令或读入数据 */
|
|
|
|
|
/* 在0x3CE端口中有对应索引号0x06的寄存器,
|
|
|
|
|
第0位用来控制字符模式,1启动图形模式;2,3位决定显存位置*/
|
|
|
|
|
/* 0x3CE中索引号0x05的寄存器,
|
|
|
|
|
第六位设置为1,设定为256色*/
|
|
|
|
|
outb(0x05,0x3CE);
|
|
|
|
|
outb(0x40,0x3CF);/* 设定256色,且取出方式为移动拼装*/
|
|
|
|
|
|
|
|
|
|
/*显存区域 A0000H - AFFFFH(64KB) */
|
|
|
|
|
outb(0x06,0x3CE);
|
|
|
|
|
outb(0x05,0x3CF);/*设定现存的地址区域,禁止字符模式*/
|
|
|
|
|
|
|
|
|
|
/*0x4C4下的索引号为0x04的寄存器
|
|
|
|
|
第四位为chain4,用于将4个显存片连在一起*/
|
|
|
|
|
outb(0x04,0x3C4);
|
|
|
|
|
outb(0x08,0x3C5);/*设定将4个现存片连在一起*/
|
|
|
|
|
|
|
|
|
|
/*设置End Horizontal Display 为79*/
|
|
|
|
|
/*用于控制在屏幕上显示的扫描线长度 */
|
|
|
|
|
outb(0x01,0x3D4);
|
|
|
|
|
outb(0x4F,0x3D5);
|
|
|
|
|
/*0x03寄存器,0-4位表示End Horizontal Blanking
|
|
|
|
|
5,6位表示Display Enable Skew;7位表示EVRA*/
|
|
|
|
|
outb(0x03,0x3D4);
|
|
|
|
|
outb(0x82,0x3D5); //设置Skew 为0
|
|
|
|
|
|
|
|
|
|
outb(0x07,0x3D4);
|
|
|
|
|
outb(0x1F,0x3D5);/*vertical display end No8,9 bit=1,0*/
|
|
|
|
|
|
|
|
|
|
outb(0x12,0x3D4);
|
|
|
|
|
outb(0x8F,0x3D5);/*vertical display end low 7b =0x8F*/
|
|
|
|
|
/*CRT控制器中索引号为0x17的寄存器中的SLDIV位设置为1,
|
|
|
|
|
Scanline Counter加一的周期为两个扫描周期*/
|
|
|
|
|
outb(0x17,0x3D4);
|
|
|
|
|
outb(0xA3,0x3D5);/*SLDIV=1 ,scanline clock/2*/
|
|
|
|
|
|
|
|
|
|
outb(0x14,0x3D4);
|
|
|
|
|
outb(0x40,0x3D5);/*DW=1*/
|
|
|
|
|
/*移动距离 = 2*Memory Address Size
|
|
|
|
|
* Offset Register/Pixels Per Address*/
|
|
|
|
|
outb(0x13,0x3D4);
|
|
|
|
|
outb(0x28,0x3D5);/*Offset=40, 20:bian chang*/
|
|
|
|
|
/*开始绘制屏幕*/
|
|
|
|
|
outb(0x0C,0x3D4);
|
|
|
|
|
outb(0x00,0x3D5);
|
|
|
|
|
outb(0x0D,0x3D4);
|
|
|
|
|
outb(0x00,0x3D5);/*Start Address=0xA0000*/
|
|
|
|
|
flag=1;
|
|
|
|
|
}
|
|
|
|
|
for(i=0;i<vga_graph_memsize;i++) *p++=3; //背景为蓝色
|
|
|
|
|
//3-blue 4-red 12-purple
|
|
|
|
|
for(i=x-cursor_side;i<=x+cursor_side;i++)
|
|
|
|
|
for(j=y-cursor_side;j<=y+cursor_side;j++){
|
|
|
|
|
p=(char *) vga_graph_memstart+j*width+i;
|
|
|
|
|
*p=12; //鼠标为红色
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int sys_get_message(){
|
|
|
|
|
return 0;
|
|
|
|
|
}
|