1 /* init_main.c 4.35 82/08/24 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/fs.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 #include "../h/quota.h" 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 struct fs *fs; 50 51 rqinit(); 52 #include "loop.h" 53 startup(firstaddr); 54 55 /* 56 * set up system process 0 (swapper) 57 */ 58 p = &proc[0]; 59 p->p_p0br = (struct pte *)mfpr(P0BR); 60 p->p_szpt = 1; 61 p->p_addr = uaddr(p); 62 p->p_stat = SRUN; 63 p->p_flag |= SLOAD|SSYS; 64 p->p_nice = NZERO; 65 setredzone(p->p_addr, (caddr_t)&u); 66 u.u_procp = p; 67 u.u_cmask = CMASK; 68 for (i = 1; i < NGROUPS; i++) 69 u.u_groups[i] = -1; 70 for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) 71 switch (i) { 72 73 case LIM_STACK: 74 u.u_limit[i] = 512*1024; 75 continue; 76 case LIM_DATA: 77 u.u_limit[i] = ctob(MAXDSIZ); 78 continue; 79 default: 80 u.u_limit[i] = INFINITY; 81 continue; 82 } 83 p->p_maxrss = INFINITY/NBPG; 84 #ifdef QUOTA 85 qtinit(); 86 p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ); 87 #endif 88 clkstart(); 89 90 /* 91 * Initialize tables, protocols, and set up well-known inodes. 92 */ 93 mbinit(); 94 cinit(); /* needed by dmc-11 driver */ 95 #ifdef INET 96 #if NLOOP > 0 97 loattach(); /* XXX */ 98 #endif 99 ifinit(); 100 pfinit(); /* must follow interfaces */ 101 #endif 102 ihinit(); 103 bhinit(); 104 binit(); 105 bswinit(); 106 #ifdef GPROF 107 kmstartup(); 108 #endif 109 110 fs = mountfs(rootdev, 0, (struct inode *)0); 111 if (fs == 0) 112 panic("iinit"); 113 bcopy("/", fs->fs_fsmnt, 2); 114 clkinit(fs->fs_time); 115 bootime = time; 116 117 rootdir = iget(rootdev, fs, (ino_t)ROOTINO); 118 iunlock(rootdir); 119 u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO); 120 iunlock(u.u_cdir); 121 122 u.u_rdir = NULL; 123 u.u_dmap = zdmap; 124 u.u_smap = zdmap; 125 126 /* 127 * Set the scan rate and other parameters of the paging subsystem. 128 */ 129 setupclock(); 130 131 /* 132 * make page-out daemon (process 2) 133 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 134 * table so that it can map dirty pages into 135 * its address space during asychronous pushes. 136 */ 137 mpid = 1; 138 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 139 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 140 if (newproc(0)) { 141 proc[2].p_flag |= SLOAD|SSYS; 142 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 143 pageout(); 144 } 145 146 /* 147 * make init process and 148 * enter scheduling loop 149 */ 150 151 mpid = 0; 152 proc[1].p_stat = 0; 153 proc[0].p_szpt = CLSIZE; 154 if (newproc(0)) { 155 expand(clrnd((int)btoc(szicode)), P0BR); 156 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 157 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 158 /* 159 * Return goes to loc. 0 of user init 160 * code just copied out. 161 */ 162 return; 163 } 164 #ifdef MUSH 165 /* 166 * start MUSH daemon 167 * pid == 3 168 */ 169 if (newproc(0)) { 170 expand(clrnd((int)btoc(szmcode)), P0BR); 171 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 172 (void) copyout((caddr_t)mcode, (caddr_t)0, (unsigned)szmcode); 173 /* 174 * Return goes to loc. 0 of user mush 175 * code just copied out. 176 */ 177 return; 178 } 179 #endif 180 proc[0].p_szpt = 1; 181 sched(); 182 } 183 184 /* 185 * Initialize hash links for buffers. 186 */ 187 bhinit() 188 { 189 register int i; 190 register struct bufhd *bp; 191 192 for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++) 193 bp->b_forw = bp->b_back = (struct buf *)bp; 194 } 195 196 /* 197 * Initialize the buffer I/O system by freeing 198 * all buffers and setting all device buffer lists to empty. 199 */ 200 binit() 201 { 202 register struct buf *bp; 203 register struct buf *dp; 204 register int i; 205 struct bdevsw *bdp; 206 struct swdevt *swp; 207 208 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 209 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 210 dp->b_flags = B_HEAD; 211 } 212 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 213 for (i = 0; i < nbuf; i++) { 214 bp = &buf[i]; 215 bp->b_dev = NODEV; 216 bp->b_un.b_addr = buffers + i * MAXBSIZE; 217 bp->b_bcount = MAXBSIZE; 218 bp->b_back = dp; 219 bp->b_forw = dp->b_forw; 220 dp->b_forw->b_back = bp; 221 dp->b_forw = bp; 222 bp->b_flags = B_BUSY|B_INVAL; 223 brelse(bp); 224 } 225 for (bdp = bdevsw; bdp->d_open; bdp++) 226 nblkdev++; 227 /* 228 * Count swap devices, and adjust total swap space available. 229 * Some of this space will not be available until a vswapon() 230 * system is issued, usually when the system goes multi-user. 231 */ 232 nswdev = 0; 233 for (swp = swdevt; swp->sw_dev; swp++) 234 nswdev++; 235 if (nswdev == 0) 236 panic("binit"); 237 if (nswdev > 1) 238 nswap = (nswap/DMMAX)*DMMAX; 239 nswap *= nswdev; 240 maxpgio *= nswdev; 241 swfree(0); 242 } 243 244 /* 245 * Initialize linked list of free swap 246 * headers. These do not actually point 247 * to buffers, but rather to pages that 248 * are being swapped in and out. 249 */ 250 bswinit() 251 { 252 register int i; 253 register struct buf *sp = swbuf; 254 255 bswlist.av_forw = sp; 256 for (i=0; i<nswbuf-1; i++, sp++) 257 sp->av_forw = sp+1; 258 sp->av_forw = NULL; 259 } 260 261 /* 262 * Initialize clist by freeing all character blocks, then count 263 * number of character devices. (Once-only routine) 264 */ 265 cinit() 266 { 267 register int ccp; 268 register struct cblock *cp; 269 register struct cdevsw *cdp; 270 271 ccp = (int)cfree; 272 ccp = (ccp+CROUND) & ~CROUND; 273 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 274 cp->c_next = cfreelist; 275 cfreelist = cp; 276 cfreecount += CBSIZE; 277 } 278 ccp = 0; 279 for(cdp = cdevsw; cdp->d_open; cdp++) 280 ccp++; 281 nchrdev = ccp; 282 } 283