1 /* init_main.c 6.8 85/03/08 */ 2 3 #include "../machine/pte.h" 4 5 #include "param.h" 6 #include "systm.h" 7 #include "dir.h" 8 #include "user.h" 9 #include "kernel.h" 10 #include "fs.h" 11 #include "mount.h" 12 #include "map.h" 13 #include "proc.h" 14 #include "inode.h" 15 #include "seg.h" 16 #include "conf.h" 17 #include "buf.h" 18 #include "vm.h" 19 #include "cmap.h" 20 #include "text.h" 21 #include "clist.h" 22 #ifdef INET 23 #include "protosw.h" 24 #endif 25 #include "quota.h" 26 #include "../machine/reg.h" 27 #include "../machine/cpu.h" 28 29 int cmask = CMASK; 30 /* 31 * Initialization code. 32 * Called from cold start routine as 33 * soon as a stack and segmentation 34 * have been established. 35 * Functions: 36 * clear and free user core 37 * turn on clock 38 * hand craft 0th process 39 * call all initialization routines 40 * fork - process 0 to schedule 41 * - process 2 to page out 42 * - process 1 execute bootstrap 43 * 44 * loop at loc 13 (0xd) in user mode -- /etc/init 45 * cannot be executed. 46 */ 47 main(firstaddr) 48 int firstaddr; 49 { 50 register int i; 51 register struct proc *p; 52 struct fs *fs; 53 int s; 54 55 rqinit(); 56 #include "loop.h" 57 startup(firstaddr); 58 59 /* 60 * set up system process 0 (swapper) 61 */ 62 p = &proc[0]; 63 p->p_p0br = u.u_pcb.pcb_p0br; 64 p->p_szpt = 1; 65 p->p_addr = uaddr(p); 66 p->p_stat = SRUN; 67 p->p_flag |= SLOAD|SSYS; 68 p->p_nice = NZERO; 69 setredzone(p->p_addr, (caddr_t)&u); 70 u.u_procp = p; 71 #ifdef vax 72 /* 73 * These assume that the u. area is always mapped 74 * to the same virtual address. Otherwise must be 75 * handled when copying the u. area in newproc(). 76 */ 77 u.u_nd.ni_iov = &u.u_nd.ni_iovec; 78 u.u_ap = u.u_arg; 79 #endif 80 u.u_nd.ni_iovcnt = 1; 81 u.u_cmask = cmask; 82 for (i = 1; i < NGROUPS; i++) 83 u.u_groups[i] = NOGROUP; 84 for (i = 0; i < sizeof(u.u_rlimit)/sizeof(u.u_rlimit[0]); i++) 85 u.u_rlimit[i].rlim_cur = u.u_rlimit[i].rlim_max = 86 RLIM_INFINITY; 87 /* 88 * Virtual memory limits get set in vminit(). 89 */ 90 vminit(); 91 #if defined(QUOTA) 92 qtinit(); 93 p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ); 94 #endif 95 startrtclock(); 96 #include "kg.h" 97 #if NKG > 0 98 startkgclock(); 99 #endif 100 101 /* 102 * Initialize tables, protocols, and set up well-known inodes. 103 */ 104 mbinit(); 105 cinit(); /* needed by dmc-11 driver */ 106 #ifdef INET 107 #if NLOOP > 0 108 loattach(); /* XXX */ 109 #endif 110 /* 111 * Block reception of incoming packets 112 * until protocols have been initialized. 113 */ 114 s = splimp(); 115 ifinit(); 116 #endif 117 domaininit(); 118 #ifdef INET 119 splx(s); 120 #endif 121 pqinit(); 122 ihinit(); 123 bhinit(); 124 binit(); 125 bswinit(); 126 nchinit(); 127 #ifdef GPROF 128 kmstartup(); 129 #endif 130 131 fs = mountfs(rootdev, 0, (struct inode *)0); 132 if (fs == 0) 133 panic("iinit"); 134 bcopy("/", fs->fs_fsmnt, 2); 135 136 inittodr(fs->fs_time); 137 boottime = time; 138 139 /* kick off timeout driven events by calling first time */ 140 roundrobin(); 141 schedcpu(); 142 schedpaging(); 143 144 /* set up the root file system */ 145 rootdir = iget(rootdev, fs, (ino_t)ROOTINO); 146 iunlock(rootdir); 147 u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO); 148 iunlock(u.u_cdir); 149 u.u_rdir = NULL; 150 151 u.u_dmap = zdmap; 152 u.u_smap = zdmap; 153 154 /* 155 * make init process 156 */ 157 158 proc[0].p_szpt = CLSIZE; 159 if (newproc(0)) { 160 expand(clrnd((int)btoc(szicode)), 0); 161 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 162 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 163 /* 164 * Return goes to loc. 0 of user init 165 * code just copied out. 166 */ 167 return; 168 } 169 /* 170 * make page-out daemon (process 2) 171 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 172 * table so that it can map dirty pages into 173 * its address space during asychronous pushes. 174 */ 175 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 176 if (newproc(0)) { 177 proc[2].p_flag |= SLOAD|SSYS; 178 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 179 pageout(); 180 /*NOTREACHED*/ 181 } 182 183 /* 184 * enter scheduling loop 185 */ 186 proc[0].p_szpt = 1; 187 sched(); 188 } 189 190 /* 191 * Initialize hash links for buffers. 192 */ 193 bhinit() 194 { 195 register int i; 196 register struct bufhd *bp; 197 198 for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++) 199 bp->b_forw = bp->b_back = (struct buf *)bp; 200 } 201 202 /* 203 * Initialize the buffer I/O system by freeing 204 * all buffers and setting all device buffer lists to empty. 205 */ 206 binit() 207 { 208 register struct buf *bp, *dp; 209 register int i; 210 struct swdevt *swp; 211 int base, residual; 212 213 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 214 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 215 dp->b_flags = B_HEAD; 216 } 217 base = bufpages / nbuf; 218 residual = bufpages % nbuf; 219 for (i = 0; i < nbuf; i++) { 220 bp = &buf[i]; 221 bp->b_dev = NODEV; 222 bp->b_bcount = 0; 223 bp->b_un.b_addr = buffers + i * MAXBSIZE; 224 if (i < residual) 225 bp->b_bufsize = (base + 1) * CLBYTES; 226 else 227 bp->b_bufsize = base * CLBYTES; 228 binshash(bp, &bfreelist[BQ_AGE]); 229 bp->b_flags = B_BUSY|B_INVAL; 230 brelse(bp); 231 } 232 /* 233 * Count swap devices, and adjust total swap space available. 234 * Some of this space will not be available until a vswapon() 235 * system is issued, usually when the system goes multi-user. 236 */ 237 nswdev = 0; 238 nswap = 0; 239 for (swp = swdevt; swp->sw_dev; swp++) { 240 nswdev++; 241 if (swp->sw_nblks > nswap) 242 nswap = swp->sw_nblks; 243 } 244 if (nswdev == 0) 245 panic("binit"); 246 if (nswdev > 1) 247 nswap = ((nswap + dmmax - 1) / dmmax) * dmmax; 248 nswap *= nswdev; 249 maxpgio *= nswdev; 250 swfree(0); 251 } 252 253 /* 254 * Initialize linked list of free swap 255 * headers. These do not actually point 256 * to buffers, but rather to pages that 257 * are being swapped in and out. 258 */ 259 bswinit() 260 { 261 register int i; 262 register struct buf *sp = swbuf; 263 264 bswlist.av_forw = sp; 265 for (i=0; i<nswbuf-1; i++, sp++) 266 sp->av_forw = sp+1; 267 sp->av_forw = NULL; 268 } 269 270 /* 271 * Initialize clist by freeing all character blocks, then count 272 * number of character devices. (Once-only routine) 273 */ 274 cinit() 275 { 276 register int ccp; 277 register struct cblock *cp; 278 279 ccp = (int)cfree; 280 ccp = (ccp+CROUND) & ~CROUND; 281 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 282 cp->c_next = cfreelist; 283 cfreelist = cp; 284 cfreecount += CBSIZE; 285 } 286 } 287