From 83af1c53935d8db72ec64122817fc47398b649e1 Mon Sep 17 00:00:00 2001 From: p6a8nelzg <1973393745@qq.com> Date: Sun, 3 Jul 2022 17:04:02 +0800 Subject: [PATCH] ADD file via upload --- sys.c | 572 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 572 insertions(+) create mode 100644 sys.c diff --git a/sys.c b/sys.c new file mode 100644 index 0000000..8f2d99f --- /dev/null +++ b/sys.c @@ -0,0 +1,572 @@ +/* + * linux/kernel/sys.c + * + * (C) 1991 Linus Torvalds + */ + +#include + +#include //调度程序头文件。定义了任务结构task_struct,任务0的数据, + //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 +#include +#include //内核头文件 +#include +#include +#include //系统名称结构头文件 + +#include +#include +int sys_ftime() +{ + return -ENOSYS; +} + +int sys_break() +{ + return -ENOSYS; +} + +int sys_ptrace() +{ + return -ENOSYS; +} + +int sys_stty() +{ + return -ENOSYS; +} + +int sys_gtty() +{ + return -ENOSYS; +} + +int sys_rename() +{ + return -ENOSYS; +} + +int sys_prof() +{ + return -ENOSYS; +} + +int sys_setregid(int rgid, int egid) +{ + if (rgid>0) { + if ((current->gid == rgid) || + suser()) + current->gid = rgid; + else + return(-EPERM); + } + if (egid>0) { + if ((current->gid == egid) || + (current->egid == egid) || + suser()) { + current->egid = egid; + current->sgid = egid; + } else + return(-EPERM); + } + return 0; +} +//设置进程组号 +int sys_setgid(int gid) +{ +/* return(sys_setregid(gid, gid)); */ + if (suser()) + current->gid = current->egid = current->sgid = gid; + else if ((gid == current->gid) || (gid == current->sgid)) + current->egid = gid; + else + return -EPERM; + return 0; +} + +int sys_acct() +{ + return -ENOSYS; +} + +int sys_phys() +{ + return -ENOSYS; +} + +int sys_lock() +{ + return -ENOSYS; +} + +int sys_mpx() +{ + return -ENOSYS; +} + +int sys_ulimit() +{ + return -ENOSYS; +} +//返回从1970年1月1号 开始记时的时间值(s) +int sys_time(long * tloc) +{ + int i; + + i = CURRENT_TIME; + if (tloc) { + verify_area(tloc,4); + put_fs_long(i,(unsigned long *)tloc); //把时间值存储到用户空间 + //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 + } + return i; +} + +/* + * Unprivileged users may change the real user id to the effective uid + * or vice versa. + */ +int sys_setreuid(int ruid, int euid) +{ + int old_ruid = current->uid; + + if (ruid>0) { + if ((current->euid==ruid) || + (old_ruid == ruid) || + suser()) + current->uid = ruid; + else + return(-EPERM); + } + if (euid>0) { + if ((old_ruid == euid) || + (current->euid == euid) || + suser()) { + current->euid = euid; + current->suid = euid; + } else { + current->uid = old_ruid; + return(-EPERM); + } + } + return 0; +} + +int sys_setuid(int uid) +{ +/* return(sys_setreuid(uid, uid)); */ + if (suser()) + current->uid = current->euid = current->suid = uid; + else if ((uid == current->uid) || (uid == current->suid)) + current->euid = uid; + else + return -EPERM; + return(0); +} + +int sys_stime(long * tptr) +{ + if (!suser()) + return -EPERM; + startup_time = get_fs_long((unsigned long *)tptr) - jiffies/HZ; + return 0; +} +//获取当前任务运行时间统计值 +int sys_times(struct tms * tbuf) +{ + if (tbuf) { + verify_area(tbuf,sizeof *tbuf); + put_fs_long(current->utime,(unsigned long *)&tbuf->tms_utime); + put_fs_long(current->stime,(unsigned long *)&tbuf->tms_stime); + put_fs_long(current->cutime,(unsigned long *)&tbuf->tms_cutime); + put_fs_long(current->cstime,(unsigned long *)&tbuf->tms_cstime); + } + return jiffies; +} +//设置程序在内存中的末端位置 +int sys_brk(unsigned long end_data_seg) +{ + //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 + if (end_data_seg >= current->end_code && + end_data_seg < current->start_stack - 16384) + current->brk = end_data_seg; + return current->brk; +} + +/* + * This needs some heave checking ... + * I just haven't get the stomach for it. I also don't fully + * understand sessions/pgrp etc. Let somebody who does explain it. + */ +int sys_setpgid(int pid, int pgid) +{ + int i; + + if (!pid) + pid = current->pid; + if (!pgid) + pgid = current->pid; + for (i=0 ; ipid==pid) { + if (task[i]->leader) + return -EPERM; + if (task[i]->session != current->session) + return -EPERM; + task[i]->pgrp = pgid; + return 0; + } + return -ESRCH; +} + +int sys_getpgrp(void) +{ + return current->pgrp; +} + +int sys_setsid(void) +{ + if (current->leader && !suser()) + return -EPERM; + current->leader = 1; + current->session = current->pgrp = current->pid; + current->tty = -1; + return current->pgrp; +} + +int sys_getgroups() +{ + return -ENOSYS; +} + +int sys_setgroups() +{ + return -ENOSYS; +} + +int sys_uname(struct utsname * name) +{ + static struct utsname thisname = { + "linux .0","nodename","release ","version ","machine " + }; + int i; + + if (!name) return -ERROR; + verify_area(name,sizeof *name); + for(i=0;iumask; + + current->umask = mask & 0777; + return (old); +} + +int sys_pipe2(void){ + return 0; +} + +int sys_sleep(unsigned int seconds){ + sys_signal(SIGALRM,SIG_IGN); + sys_alarm(seconds); + sys_pause(); + return 0; +} + +// int sys_execve2(){ +// return 0; +// } + +/*获取目录的目录项*/ +/*fd指目录描述符，dirp指目录信息，count指目录信息大小*/ +int sys_getdents(unsigned int fd,struct linux_dirent *dirp,unsigned int count) +{ + struct file *file; + struct m_inode *inode; + struct buffer_head *bh; + struct dir_entry *de; + struct linux_dirent *temp; + char * buf; + int i,len = 0,ret = 0; + + if(!count)return -1; + if(fd>=NR_OPEN)return -1; /*fd超过进程最多打开文件数20*/ + + file=current->filp[fd]; + if(!file)return -1; + inode = file->f_inode; + temp = (struct linux_dirent *)malloc(sizeof(struct linux_dirent)); //目录信息 + buf = (char*)malloc(sizeof(struct linux_dirent)); + bh = bread(inode->i_dev , inode->i_zone[0]); //读取指向的数据块 + + for (;reti_size;ret += sizeof(struct dir_entry)){ + if (len >= count-sizeof(struct linux_dirent)) + break; + de = (struct dir_entry *)(bh->b_data + ret);/*de更新为当前目录项*/ + if (!de->inode )/*如果节点号为空，就退出*/ + continue; + /*用temp保存当前目录项信息*/ + temp->d_ino = de->inode; + temp->d_off = 0; + temp->d_reclen = sizeof(struct linux_dirent); + strcpy(temp->d_name,de->name); + /*将数据写回到用户*/ + memcpy(buf, temp, sizeof(struct linux_dirent)); + for (i=0;i < sizeof(struct linux_dirent);i++){ + 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(;reti_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;iname,"..")){ + 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;iinode == 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;ivm_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