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;iblock_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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