1 /* init_main.c 4.20 81/11/14 */ 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/protocol.h" 25 #include "../h/protosw.h" 26 #endif 27 28 /* 29 * Initialization code. 30 * Called from cold start routine as 31 * soon as a stack and segmentation 32 * have been established. 33 * Functions: 34 * clear and free user core 35 * turn on clock 36 * hand craft 0th process 37 * call all initialization routines 38 * fork - process 0 to schedule 39 * - process 2 to page out 40 * - process 1 execute bootstrap 41 * 42 * loop at loc 13 (0xd) in user mode -- /etc/init 43 * cannot be executed. 44 */ 45 main(firstaddr) 46 { 47 register int i; 48 register struct proc *p; 49 50 rqinit(); 51 startup(firstaddr); 52 53 /* 54 * set up system process 0 (swapper) 55 */ 56 p = &proc[0]; 57 p->p_p0br = (struct pte *)mfpr(P0BR); 58 p->p_szpt = 1; 59 p->p_addr = uaddr(p); 60 p->p_stat = SRUN; 61 p->p_flag |= SLOAD|SSYS; 62 p->p_nice = NZERO; 63 setredzone(p->p_addr, (caddr_t)&u); 64 u.u_procp = p; 65 u.u_cmask = CMASK; 66 for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) 67 switch (i) { 68 69 case LIM_STACK: 70 u.u_limit[i] = 512*1024; 71 continue; 72 case LIM_DATA: 73 u.u_limit[i] = ctob(MAXDSIZ); 74 continue; 75 default: 76 u.u_limit[i] = INFINITY; 77 continue; 78 } 79 p->p_maxrss = INFINITY/NBPG; 80 clkstart(); 81 82 /* 83 * Initialize tables, protocols, and set up well-known inodes. 84 */ 85 mbinit(); 86 #ifdef INET 87 pfinit(); 88 #endif 89 ihinit(); 90 bhinit(); 91 cinit(); 92 binit(); 93 bswinit(); 94 iinit(); 95 rootdir = iget(rootdev, (ino_t)ROOTINO); 96 rootdir->i_flag &= ~ILOCK; 97 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 98 u.u_cdir->i_flag &= ~ILOCK; 99 u.u_rdir = NULL; 100 u.u_dmap = zdmap; 101 u.u_smap = zdmap; 102 103 /* 104 * Set the scan rate and other parameters of the paging subsystem. 105 */ 106 setupclock(); 107 108 /* 109 * make page-out daemon (process 2) 110 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 111 * table so that it can map dirty pages into 112 * its address space during asychronous pushes. 113 */ 114 mpid = 1; 115 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 116 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 117 if (newproc(0)) { 118 proc[2].p_flag |= SLOAD|SSYS; 119 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 120 pageout(); 121 } 122 123 /* 124 * make init process and 125 * enter scheduling loop 126 */ 127 128 mpid = 0; 129 proc[1].p_stat = 0; 130 proc[0].p_szpt = CLSIZE; 131 if (newproc(0)) { 132 expand(clrnd((int)btoc(szicode)), P0BR); 133 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 134 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 135 /* 136 * Return goes to loc. 0 of user init 137 * code just copied out. 138 */ 139 return; 140 } 141 142 #ifdef BBNNET 143 /* 144 * Initialize bbn network. 145 */ 146 netmain(); 147 #endif BBNNET 148 proc[0].p_szpt = 1; 149 sched(); 150 } 151 152 /* 153 * iinit is called once (from main) 154 * very early in initialization. 155 * It reads the root's super block 156 * and initializes the current date 157 * from the last modified date. 158 * 159 * panic: iinit -- cannot read the super 160 * block. Usually because of an IO error. 161 */ 162 iinit() 163 { 164 register struct buf *bp; 165 register struct filsys *fp; 166 register int i; 167 168 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 169 bp = bread(rootdev, SUPERB); 170 if(u.u_error) 171 panic("iinit"); 172 bp->b_flags |= B_LOCKED; /* block can never be re-used */ 173 brelse(bp); 174 mount[0].m_dev = rootdev; 175 mount[0].m_bufp = bp; 176 fp = bp->b_un.b_filsys; 177 fp->s_flock = 0; 178 fp->s_ilock = 0; 179 fp->s_ronly = 0; 180 fp->s_lasti = 1; 181 fp->s_nbehind = 0; 182 fp->s_fsmnt[0] = '/'; 183 for (i = 1; i < sizeof(fp->s_fsmnt); i++) 184 fp->s_fsmnt[i] = 0; 185 clkinit(fp->s_time); 186 bootime = time; 187 } 188 189 /* 190 * Initialize the buffer I/O system by freeing 191 * all buffers and setting all device buffer lists to empty. 192 */ 193 binit() 194 { 195 register struct buf *bp; 196 register struct buf *dp; 197 register int i; 198 struct bdevsw *bdp; 199 struct swdevt *swp; 200 201 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 202 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 203 dp->b_flags = B_HEAD; 204 } 205 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 206 for (i=0; i<nbuf; i++) { 207 bp = &buf[i]; 208 bp->b_dev = NODEV; 209 bp->b_un.b_addr = buffers + i * BSIZE; 210 bp->b_back = dp; 211 bp->b_forw = dp->b_forw; 212 dp->b_forw->b_back = bp; 213 dp->b_forw = bp; 214 bp->b_flags = B_BUSY|B_INVAL; 215 brelse(bp); 216 } 217 for (bdp = bdevsw; bdp->d_open; bdp++) 218 nblkdev++; 219 /* 220 * Count swap devices, and adjust total swap space available. 221 * Some of this space will not be available until a vswapon() 222 * system is issued, usually when the system goes multi-user. 223 */ 224 nswdev = 0; 225 for (swp = swdevt; swp->sw_dev; swp++) 226 nswdev++; 227 if (nswdev == 0) 228 panic("binit"); 229 if (nswdev > 1) 230 nswap = (nswap/DMMAX)*DMMAX; 231 nswap *= nswdev; 232 maxpgio *= nswdev; 233 swfree(0); 234 } 235 236 /* 237 * Initialize linked list of free swap 238 * headers. These do not actually point 239 * to buffers, but rather to pages that 240 * are being swapped in and out. 241 */ 242 bswinit() 243 { 244 register int i; 245 register struct buf *sp = swbuf; 246 247 bswlist.av_forw = sp; 248 for (i=0; i<nswbuf-1; i++, sp++) 249 sp->av_forw = sp+1; 250 sp->av_forw = NULL; 251 } 252 253 /* 254 * Initialize clist by freeing all character blocks, then count 255 * number of character devices. (Once-only routine) 256 */ 257 cinit() 258 { 259 register int ccp; 260 register struct cblock *cp; 261 register struct cdevsw *cdp; 262 263 ccp = (int)cfree; 264 ccp = (ccp+CROUND) & ~CROUND; 265 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 266 cp->c_next = cfreelist; 267 cfreelist = cp; 268 cfreecount += CBSIZE; 269 } 270 ccp = 0; 271 for(cdp = cdevsw; cdp->d_open; cdp++) 272 ccp++; 273 nchrdev = ccp; 274 } 275