汇编简单的操作系统.docx
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汇编简单的操作系统.docx
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汇编简单的操作系统
114
Step24
Step25open()
Step26
Step27
Step28
Step29logout
Step30halt
End
1.makefile
makefile
makefile
filsys:
main.oigetput.oiallfre.oballfre.oname.oaccess.olog.oclose.ocreat.odelete.odir.oopen.ordwt.oformat.oinstall.ohalt.cc–ofilsysmain.oigetput.oiallfre.oballfre.o
name.oaccess.olog.oclose.ocreat.odelete.odir.oopen.ordwt.oformat.oinstall.ohalt.o
main.o:
main.cfilesys.h
cc–cmain.c
igetput.o:
igetput.cfilesys.h
cc–cigetput.c
iallfre.o:
iallfre.cfilesys.h
cc–ciallfre.c
ballfre.o:
ballfre.cfilesys.h
cc–caccess.c
log.o:
log.cfilesys.h
cc–clog.c
close.o:
close.cfilesys.h
cc–cclose.c
creat.o:
creat.cfilesys.h
cc–ccreat.c
115
delete.o:
delete.cfilesys.h
cc–cdelete.c
dir.o:
dir.cfilesys.h
cc–cdir.c
open.o:
open.cfilesys.h
cc–copen.c
rdwt.o:
rdwt.cfilesys.h
cc–crdwt.c
format.o:
format.cfilesys.h
cc–cformat.c
install.o:
install.cfilesys.h
cc–cinstall.c
halt.o:
halt.c
cc–chalt.c
2.filesys.h
filesys.h
filesys.h
#defineBLOCKSIZ512
#defineSYSOPENFILE40
#defineDIRSIZ14
#definePWDSIZ12
#definePWDNUM32
#defineNOFILE20
#defineNADDR10
#defineNHINO128/*mustbepowerof2*/
#defineUSERNUM10
#defineDINODESIZ32
/*filsys*/
#defineDINODEBLK32
#defineFILEBLK512
#defineNICFREE50
#defineNICINOD50
#defineDINODESTART2*BLOCKSIZ
#defineDATASTART(2+DINODEBLK)*BLOCKSIZ
116
/*di_mode*/
#defineDIEMPTY00000
#defineDIFILE01000
#defineDIDIR02000
#defineUDIREAD00001/*user*/
#defineUDIWRITE00002
#defineUDIEXICUTE00004
#defineGDIREAD00010/*group*/
#defineGDIWRITE00020
#defineGDIEXICUTE00040
#defineODIREAD00100/*other*/
#defineODIWRITE00200
#defineODIEXICUTE00400
#defineREAD1
#defineWRITE2
#defineEXICUTE3
#defineDEFAULTMODE00777
/*i_flag*/
#defineIUPDATE00002
/*s_fmod*/
#defineSUPDATE00001
/*f_flag*/
#defineFREAD00001
#defineFWRITE00002
#defineFAPPEND00004
/*error*/
#defineDISKFULL65535
/*fseekorigin*/
#defineSEEK_SET0
structinode{
structinode*i_forw;
structinode*i_back;
117
chari_flag;
unsignedinti_ino;
unsignedinti_count;
unsignedshortdi_number;
unsignedshortdi_mode;
unsignedshortdi_uid;
unsignedshortdi_gid;
unsignedshortdi_size;
unsignedintdi_addr[NADDR];
};
structdinode{
unsignedshortdi_number;
unsignedshortdi_mode;
unsignedshortdi_uid;
unsignedshortdi_gid;
unsignedlongdi_size;
unsignedintdi_addr[NADDR]
};
stuctdirect{
chard_name[DIRSIZ];
unsignedintd_ino;
};
structfilsys{
unsignedshorts_isize;
unsignedlongs_fsize
unsignedints_nfree;
unsignedshorts_pfree;
unsignedints_free[NICFREE];
unsignedints_ninode;/*numberoffreeinodeins_inode*/
unsignedshorts_pinode;/*pointerofthesinode*/
unsignedints_inode[NICINOD];
unsignedints_rinode;/*rememberinode*/
chats_fmod;
};
structpwd{
unsignedshortp_uid;
unsignedshortp_gid;
118
charpassword[PWDSIZ];
};
structdir{
structdirectdirect[DIRNUM];
intsize;
};
structhinode{
structinode*i_forw;/*hash*/
};
structfile{
charf_flag;
unsignedintf_count;
structinode*f_inode;
unsignedlongf_off;/*read/writecharacterpointer*?
};
structuser{
unsignedsjpitu_default_mode;
unsignedsjpitu_uid;
unsignedsjpitu_gid;
unsignedsjpitu_ofile[NOFILE];
/*systemopenfilepointernumber*/
};
externstructhinodehinode[NHINO];
externstructdirdir;
externstructfilesys_ofile[SYSOPENFILE];
externstructfilesysfilsys;
externstructpwdpwd[PWDNUM];
externstructuseruser[USERNUM];
externFILE*fd;/*thefilesystemcolumnofallthesystem*/
externstructinode*cur_path_inode;
externintuser_id;
/*proptypeofthesubroutionusedinthefilesystem*/
externstructinode*iget();
externinput();
externunsignedintballoc();
externbfree();
119
externstructinode*ialloc();
externifree();
externunsignedintnamei();
externunsignedshortiname()
externunsignedintaccess();
extern_dir()
externmkdir();
externchdir();
externunsignedshortopen();
externcreat();
externunsignedintread();
externunsignedintwrite();
externintlogin();
externlogout();
externinstall();
externformat();
externclose();
externhalt();
3.main()main.c
main.c
#include
#include“filesys.h”
strictjompdejompde[NHINO];
structdirdir;
structfilesys_ofile[SYSOPENFILE];
structfilsysfilsys;
structpwdpwd[PWDNUM];
structuseruser[USERNUM];
FILE*fd;
structinode*cur_path_inode;
intuser_id;
main()
{
unsignedshortab_fd1.ab_fd2.ab_fd3.ab_fd4;
unsignedshortbhy_fdl;
120
char*buf;
print(“\nDoyouwanttoformatthedisk\n”);
if(getchar()==‘y’)
printf(“\nFormatwilleraseallcontextonthedisk\nAreYouSure!
!
\n”);
if(getchar()==‘y’)
format();
install();
_dir();
login(2118,“abcd”);
user_id=0;
mkdir(“a2118”);
chdir(“a2118”);
wifd1=creat(2118.“ab_file0.c”.01777);
buf=(char*)malloc(BLOCKSIZ*6+5);
write(ab_fdl.buf.BLOCKSIZ*6+5);
close(user_id.ab_fdl);
free(buf);
mkdir(“subdir”);
chdir(“subdir”);
wj_fd2=creat(2118.“file1.c”.01777);
buf=(char*)malloc(BLOCKSIZ*4+20);
write(ab_fd2,buf,BLOCKSIZ*4+20);
close(user_id,ab_fd2);
free(buf);
chdir(“..”);
ab_fd3=creat(2118.“_file2.c”,01777);
buf=(char*)malloc(BLOCKSIZ*10+255);
write(ab_fd3,but,BLOCKSIZ*3+255);
close(ab_fd3);
free(buf);
delete(“ab_file0.c”);
sb_fd4=creat(2118.“ab_file3.c”.01777);
buf=(char*)malloc(BLOCKSIZ*8+300);
write(aab_fd4,buf,BLOCKSIZ*8+300);
close(ab_fd4);
free(buf);
121
ab_fd3=open(2118,“ab_file2.c”.FAPPEND);
buf=(char*)malloc(BLOCKSIZ*3+100);
write(ab_fd3,buf,BLOCKSIZ*3+100);
close(ab_fd3);
free(buf);
_dir();
chdir(“..”);
logout();
halt();
}
4.format()format.c
#include
#include“filesys.h”
format()
{
structinode*inode;
structdirectdir_buf[BLOCKSIZ/(DIRSIZ+2)];
structpwdpasswd[BLOCKSIZ/(PWDSIZ+4)];
/*
{
{2116,03,“dddd”},
{2117,03,“bbbb”},
{2118,04,“abcd”},
{2119,04,“cccc”},
{2120,05,“eeee”},
};
*/
structfilsys;
unsignedintblock_buf[BLOCKSIZ/sizeof(int)];
char*buf;
intI,jl
/*creatthefilesystemfile*/
fd=(char*)malloc((DINODEBLK+FILEBLK+2)*BLOCKSIZ*sizeof(char));
if(buf==NULL)
{
122
printf(“\nfilesystemfilecreatfailed!
!
!
\n”);
exit(0);
}
fseek(fd,0,SEEK_SET);
fwrite(buf,1,(DINODEBLK+FILEBLK+2)*BLOCKSIZ*sizeof(char),fd);
/*0.initializethepasswd*/
passwd[0].p_uid=2116;passwd[0].p_gid=03;
strepy(passwd[0].password,“dddd”);
passwd[1].p_uid=2117;passwd[1].p_gid=04;
strepy(passwd[1].password,“bbbb”);
passwd[2].p_uid=2118;passwd[2].p_gid=04;
strepy(passwd[2].password,“abcd”);
passwd[3].p_uid=2119;passwd[3].p_gid=04;
strepy(passwd[3].password,“cccc”);
passwd[4].p_uid=2120;passwd[4].p_gid=05;
strepy(passwd[2].password,“eeee”);
/*1.creatthemaindirecroryanditssubdiretcandthefilepassword*/
inode=iget(0);/*0emptydinodeid*/
inode->di_mode=DIEMPTY;
iput(inode);
inode=iget
(1);/*1maindirid*/
inode->di_muber=1;
inode->di_mode=DEFAULTMODE|DIDIR;
inode->di_size=3*(DIRSIZ+2);
inode->di_addr[0]=0;/*block0#isusedbythemaindirectory*/
strcpy(dir_buf[0].d_name,“..”);
dir_buf[0].d_ino=1;
strcpy(dir_buf[1].d_name.“.”);
dir_buf[1].d_ino=2;
strcpy(dir_buf[2].d_name.“etc”);
dir_buf[2].d_ino=2;
fseek(fd,DATASTART,SEEK_SET);
fwrite(dir_buf,1,3*(DIRSIZ+2).FD);
iput(inode);
inode=iget
(2);/*2etcdirid*/
inode->di_number=1;
123
inode->di_mode=DEFAULTMODE|DIDIR;
inode->di_size=3*(DIRSIZ+2);
inode->di_addr[0]=1;/*block1#isusedbytheetcdirectory*/
strcpy(dir_buf[0].d_name,“..”);
dir_buf[0].d_ino=1;
strcpy(dir_buf[1].d_name,“.”);
dir_buf[1].d_ino=2;
strcpy(dir_buf[2].d_name,“password”);
dir_buf[2].d_ino=3;
fseek(fd,DATASTART+BLOCKSIZ*1,SEEK_SET);
fwrite(dir_buf,1,3*(DIRSIZ+2),fd);
iput(inode);
inode=iget(3);/*3passwordid*/
inode->di_number=1;
inode->di_mode=DEFAULTMODE|DIFILE;
inode->di_size=BLOCKSIZ;
inode->di_addr[0]=2;/*block2#isusedbythepasswordfile*/
for(I=5;i { passwd[i].p_uid=0; passwd[i].p_gid=0; strcpy(passwd[i].password.“”); } fseek(fd,DATASTART+2*BLOCKSIZ,SEEK_SET); fwrite(passwd,1,BLOCKSIZ,fd); iput(inode); /*2.initializethesuperblock*/ filsys.s_isize=DINODEBLK; filsys.s_isize=FILEBLK; filsys.s_ninode=DINODEBLK*BLOCKSIZ/DINODESIZ–4 filsys.s_nfree=FILEBLK–3; for(I=o;i { /*beginwith4,0,1,2,3,isusedbymain.etc.password*? filsys.s_inode[i]=4+I; } 124 filsys.s_pinode=0; filsys.s_rinode=NICINOD+4; block_buf[NICFREE–1]=FILEBLK+1;/*FILEBLK+1isaflagofend*/ for(I=0;i block_buf[NICFREE–2–i]=FILEBLK-I; fseek(fd,DATASTART+BLOCKSIZ*(FILEBLK–NICFREE–1),SEEK_SET); fwrite(block_buf,1.BLOCKSIZ,fd); for(i=FILEBLK–NICFREE–1;i>2;i-=NICFREE) { for(j=0;j { block_buf[j]=i–j; } fseek(fd,DATASTART+BLOCKSIZ*(i–1),SEEK_SET); fwrite(block_buf,1,BLOCKSIZ,f
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