1 /* init_main.c 4.22 81/11/18 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/filsys.h" 8 #include "../h/mount.h" 9 #include "../h/map.h" 10 #include "../h/proc.h" 11 #include "../h/inode.h" 12 #include "../h/seg.h" 13 #include "../h/conf.h" 14 #include "../h/buf.h" 15 #include "../h/mtpr.h" 16 #include "../h/pte.h" 17 #include "../h/clock.h" 18 #include "../h/vm.h" 19 #include "../h/cmap.h" 20 #include "../h/text.h" 21 #include "../h/vlimit.h" 22 #include "../h/clist.h" 23 #ifdef INET 24 #include "../h/protosw.h" 25 #endif 26 27 /* 28 * Initialization code. 29 * Called from cold start routine as 30 * soon as a stack and segmentation 31 * have been established. 32 * Functions: 33 * clear and free user core 34 * turn on clock 35 * hand craft 0th process 36 * call all initialization routines 37 * fork - process 0 to schedule 38 * - process 2 to page out 39 * - process 1 execute bootstrap 40 * 41 * loop at loc 13 (0xd) in user mode -- /etc/init 42 * cannot be executed. 43 */ 44 main(firstaddr) 45 { 46 register int i; 47 register struct proc *p; 48 49 rqinit(); 50 startup(firstaddr); 51 52 /* 53 * set up system process 0 (swapper) 54 */ 55 p = &proc[0]; 56 p->p_p0br = (struct pte *)mfpr(P0BR); 57 p->p_szpt = 1; 58 p->p_addr = uaddr(p); 59 p->p_stat = SRUN; 60 p->p_flag |= SLOAD|SSYS; 61 p->p_nice = NZERO; 62 setredzone(p->p_addr, (caddr_t)&u); 63 u.u_procp = p; 64 u.u_cmask = CMASK; 65 for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) 66 switch (i) { 67 68 case LIM_STACK: 69 u.u_limit[i] = 512*1024; 70 continue; 71 case LIM_DATA: 72 u.u_limit[i] = ctob(MAXDSIZ); 73 continue; 74 default: 75 u.u_limit[i] = INFINITY; 76 continue; 77 } 78 p->p_maxrss = INFINITY/NBPG; 79 clkstart(); 80 81 /* 82 * Initialize tables, protocols, and set up well-known inodes. 83 */ 84 mbinit(); 85 #ifdef INET 86 pfinit(); 87 #endif 88 ihinit(); 89 bhinit(); 90 cinit(); 91 binit(); 92 bswinit(); 93 iinit(); 94 rootdir = iget(rootdev, (ino_t)ROOTINO); 95 rootdir->i_flag &= ~ILOCK; 96 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 97 u.u_cdir->i_flag &= ~ILOCK; 98 u.u_rdir = NULL; 99 u.u_dmap = zdmap; 100 u.u_smap = zdmap; 101 102 /* 103 * Set the scan rate and other parameters of the paging subsystem. 104 */ 105 setupclock(); 106 107 /* 108 * make page-out daemon (process 2) 109 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 110 * table so that it can map dirty pages into 111 * its address space during asychronous pushes. 112 */ 113 mpid = 1; 114 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 115 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 116 if (newproc(0)) { 117 proc[2].p_flag |= SLOAD|SSYS; 118 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 119 pageout(); 120 } 121 122 /* 123 * make init process and 124 * enter scheduling loop 125 */ 126 127 mpid = 0; 128 proc[1].p_stat = 0; 129 proc[0].p_szpt = CLSIZE; 130 if (newproc(0)) { 131 expand(clrnd((int)btoc(szicode)), P0BR); 132 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 133 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 134 /* 135 * Return goes to loc. 0 of user init 136 * code just copied out. 137 */ 138 return; 139 } 140 141 #ifdef BBNNET 142 /* 143 * Initialize bbn network. 144 */ 145 netmain(); 146 #endif BBNNET 147 proc[0].p_szpt = 1; 148 sched(); 149 } 150 151 /* 152 * iinit is called once (from main) 153 * very early in initialization. 154 * It reads the root's super block 155 * and initializes the current date 156 * from the last modified date. 157 * 158 * panic: iinit -- cannot read the super 159 * block. Usually because of an IO error. 160 */ 161 iinit() 162 { 163 register struct buf *bp; 164 register struct filsys *fp; 165 register int i; 166 167 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 168 bp = bread(rootdev, SUPERB); 169 if(u.u_error) 170 panic("iinit"); 171 bp->b_flags |= B_LOCKED; /* block can never be re-used */ 172 brelse(bp); 173 mount[0].m_dev = rootdev; 174 mount[0].m_bufp = bp; 175 fp = bp->b_un.b_filsys; 176 fp->s_flock = 0; 177 fp->s_ilock = 0; 178 fp->s_ronly = 0; 179 fp->s_lasti = 1; 180 fp->s_nbehind = 0; 181 fp->s_fsmnt[0] = '/'; 182 for (i = 1; i < sizeof(fp->s_fsmnt); i++) 183 fp->s_fsmnt[i] = 0; 184 clkinit(fp->s_time); 185 bootime = time; 186 } 187 188 /* 189 * Initialize the buffer I/O system by freeing 190 * all buffers and setting all device buffer lists to empty. 191 */ 192 binit() 193 { 194 register struct buf *bp; 195 register struct buf *dp; 196 register int i; 197 struct bdevsw *bdp; 198 struct swdevt *swp; 199 200 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 201 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 202 dp->b_flags = B_HEAD; 203 } 204 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 205 for (i=0; i<nbuf; i++) { 206 bp = &buf[i]; 207 bp->b_dev = NODEV; 208 bp->b_un.b_addr = buffers + i * BSIZE; 209 bp->b_back = dp; 210 bp->b_forw = dp->b_forw; 211 dp->b_forw->b_back = bp; 212 dp->b_forw = bp; 213 bp->b_flags = B_BUSY|B_INVAL; 214 brelse(bp); 215 } 216 for (bdp = bdevsw; bdp->d_open; bdp++) 217 nblkdev++; 218 /* 219 * Count swap devices, and adjust total swap space available. 220 * Some of this space will not be available until a vswapon() 221 * system is issued, usually when the system goes multi-user. 222 */ 223 nswdev = 0; 224 for (swp = swdevt; swp->sw_dev; swp++) 225 nswdev++; 226 if (nswdev == 0) 227 panic("binit"); 228 if (nswdev > 1) 229 nswap = (nswap/DMMAX)*DMMAX; 230 nswap *= nswdev; 231 maxpgio *= nswdev; 232 swfree(0); 233 } 234 235 /* 236 * Initialize linked list of free swap 237 * headers. These do not actually point 238 * to buffers, but rather to pages that 239 * are being swapped in and out. 240 */ 241 bswinit() 242 { 243 register int i; 244 register struct buf *sp = swbuf; 245 246 bswlist.av_forw = sp; 247 for (i=0; i<nswbuf-1; i++, sp++) 248 sp->av_forw = sp+1; 249 sp->av_forw = NULL; 250 } 251 252 /* 253 * Initialize clist by freeing all character blocks, then count 254 * number of character devices. (Once-only routine) 255 */ 256 cinit() 257 { 258 register int ccp; 259 register struct cblock *cp; 260 register struct cdevsw *cdp; 261 262 ccp = (int)cfree; 263 ccp = (ccp+CROUND) & ~CROUND; 264 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 265 cp->c_next = cfreelist; 266 cfreelist = cp; 267 cfreecount += CBSIZE; 268 } 269 ccp = 0; 270 for(cdp = cdevsw; cdp->d_open; cdp++) 271 ccp++; 272 nchrdev = ccp; 273 } 274