1 /* init_main.c 4.36 82/09/04 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/dir.h" 6 #include "../h/user.h" 7 #include "../h/kernel.h" 8 #include "../h/fs.h" 9 #include "../h/mount.h" 10 #include "../h/map.h" 11 #include "../h/proc.h" 12 #include "../h/inode.h" 13 #include "../h/seg.h" 14 #include "../h/conf.h" 15 #include "../h/buf.h" 16 #include "../h/mtpr.h" 17 #include "../h/pte.h" 18 #include "../h/vm.h" 19 #include "../h/cmap.h" 20 #include "../h/text.h" 21 #include "../h/clist.h" 22 #ifdef INET 23 #include "../h/protosw.h" 24 #endif 25 #include "../h/quota.h" 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 struct fs *fs; 49 50 rqinit(); 51 #include "loop.h" 52 startup(firstaddr); 53 54 /* 55 * set up system process 0 (swapper) 56 */ 57 p = &proc[0]; 58 p->p_p0br = (struct pte *)mfpr(P0BR); 59 p->p_szpt = 1; 60 p->p_addr = uaddr(p); 61 p->p_stat = SRUN; 62 p->p_flag |= SLOAD|SSYS; 63 p->p_nice = NZERO; 64 setredzone(p->p_addr, (caddr_t)&u); 65 u.u_procp = p; 66 u.u_cmask = CMASK; 67 for (i = 1; i < NGROUPS; i++) 68 u.u_groups[i] = -1; 69 for (i = 0; i < sizeof(u.u_rlimit)/sizeof(u.u_rlimit[0]); i++) 70 u.u_rlimit[i].rlim_cur = u.u_rlimit[i].rlim_max = 71 RLIM_INFINITY; 72 u.u_rlimit[RLIMIT_STACK].rlim_cur = 512*1024; 73 u.u_rlimit[RLIMIT_DATA].rlim_cur = ctob(MAXDSIZ); 74 p->p_maxrss = RLIM_INFINITY/NBPG; 75 #ifdef QUOTA 76 qtinit(); 77 p->p_quota = u.u_quota = getquota(0, 0, Q_NDQ); 78 #endif 79 clockstart(); 80 81 /* 82 * Initialize tables, protocols, and set up well-known inodes. 83 */ 84 mbinit(); 85 cinit(); /* needed by dmc-11 driver */ 86 #ifdef INET 87 #if NLOOP > 0 88 loattach(); /* XXX */ 89 #endif 90 ifinit(); 91 pfinit(); /* must follow interfaces */ 92 #endif 93 ihinit(); 94 bhinit(); 95 binit(); 96 bswinit(); 97 #ifdef GPROF 98 kmstartup(); 99 #endif 100 101 fs = mountfs(rootdev, 0, (struct inode *)0); 102 if (fs == 0) 103 panic("iinit"); 104 bcopy("/", fs->fs_fsmnt, 2); 105 clockinit(fs->fs_time); 106 boottime = time; 107 108 rootdir = iget(rootdev, fs, (ino_t)ROOTINO); 109 iunlock(rootdir); 110 u.u_cdir = iget(rootdev, fs, (ino_t)ROOTINO); 111 iunlock(u.u_cdir); 112 113 u.u_rdir = NULL; 114 u.u_dmap = zdmap; 115 u.u_smap = zdmap; 116 117 /* 118 * Set the scan rate and other parameters of the paging subsystem. 119 */ 120 setupclock(); 121 122 /* 123 * make page-out daemon (process 2) 124 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 125 * table so that it can map dirty pages into 126 * its address space during asychronous pushes. 127 */ 128 mpid = 1; 129 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 130 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 131 if (newproc(0)) { 132 proc[2].p_flag |= SLOAD|SSYS; 133 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 134 pageout(); 135 } 136 137 /* 138 * make init process and 139 * enter scheduling loop 140 */ 141 142 mpid = 0; 143 proc[1].p_stat = 0; 144 proc[0].p_szpt = CLSIZE; 145 if (newproc(0)) { 146 expand(clrnd((int)btoc(szicode)), P0BR); 147 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 148 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 149 /* 150 * Return goes to loc. 0 of user init 151 * code just copied out. 152 */ 153 return; 154 } 155 #ifdef MUSH 156 /* 157 * start MUSH daemon 158 * pid == 3 159 */ 160 if (newproc(0)) { 161 expand(clrnd((int)btoc(szmcode)), P0BR); 162 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 163 (void) copyout((caddr_t)mcode, (caddr_t)0, (unsigned)szmcode); 164 /* 165 * Return goes to loc. 0 of user mush 166 * code just copied out. 167 */ 168 return; 169 } 170 #endif 171 proc[0].p_szpt = 1; 172 sched(); 173 } 174 175 /* 176 * Initialize hash links for buffers. 177 */ 178 bhinit() 179 { 180 register int i; 181 register struct bufhd *bp; 182 183 for (bp = bufhash, i = 0; i < BUFHSZ; i++, bp++) 184 bp->b_forw = bp->b_back = (struct buf *)bp; 185 } 186 187 /* 188 * Initialize the buffer I/O system by freeing 189 * all buffers and setting all device buffer lists to empty. 190 */ 191 binit() 192 { 193 register struct buf *bp; 194 register struct buf *dp; 195 register int i; 196 struct bdevsw *bdp; 197 struct swdevt *swp; 198 199 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 200 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 201 dp->b_flags = B_HEAD; 202 } 203 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 204 for (i = 0; i < nbuf; i++) { 205 bp = &buf[i]; 206 bp->b_dev = NODEV; 207 bp->b_un.b_addr = buffers + i * MAXBSIZE; 208 bp->b_bcount = MAXBSIZE; 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