1 /* init_main.c 4.23 81/12/03 */ 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 #include "lo.h" 89 #if NLOOP > 0 90 loattach(); 91 #endif 92 ihinit(); 93 bhinit(); 94 cinit(); 95 binit(); 96 bswinit(); 97 iinit(); 98 rootdir = iget(rootdev, (ino_t)ROOTINO); 99 rootdir->i_flag &= ~ILOCK; 100 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 101 u.u_cdir->i_flag &= ~ILOCK; 102 u.u_rdir = NULL; 103 u.u_dmap = zdmap; 104 u.u_smap = zdmap; 105 106 /* 107 * Set the scan rate and other parameters of the paging subsystem. 108 */ 109 setupclock(); 110 111 /* 112 * make page-out daemon (process 2) 113 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 114 * table so that it can map dirty pages into 115 * its address space during asychronous pushes. 116 */ 117 mpid = 1; 118 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 119 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 120 if (newproc(0)) { 121 proc[2].p_flag |= SLOAD|SSYS; 122 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 123 pageout(); 124 } 125 126 /* 127 * make init process and 128 * enter scheduling loop 129 */ 130 131 mpid = 0; 132 proc[1].p_stat = 0; 133 proc[0].p_szpt = CLSIZE; 134 if (newproc(0)) { 135 expand(clrnd((int)btoc(szicode)), P0BR); 136 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 137 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 138 /* 139 * Return goes to loc. 0 of user init 140 * code just copied out. 141 */ 142 return; 143 } 144 145 #ifdef BBNNET 146 /* 147 * Initialize bbn network. 148 */ 149 netmain(); 150 #endif BBNNET 151 proc[0].p_szpt = 1; 152 sched(); 153 } 154 155 /* 156 * iinit is called once (from main) 157 * very early in initialization. 158 * It reads the root's super block 159 * and initializes the current date 160 * from the last modified date. 161 * 162 * panic: iinit -- cannot read the super 163 * block. Usually because of an IO error. 164 */ 165 iinit() 166 { 167 register struct buf *bp; 168 register struct filsys *fp; 169 register int i; 170 171 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 172 bp = bread(rootdev, SUPERB); 173 if(u.u_error) 174 panic("iinit"); 175 bp->b_flags |= B_LOCKED; /* block can never be re-used */ 176 brelse(bp); 177 mount[0].m_dev = rootdev; 178 mount[0].m_bufp = bp; 179 fp = bp->b_un.b_filsys; 180 fp->s_flock = 0; 181 fp->s_ilock = 0; 182 fp->s_ronly = 0; 183 fp->s_lasti = 1; 184 fp->s_nbehind = 0; 185 fp->s_fsmnt[0] = '/'; 186 for (i = 1; i < sizeof(fp->s_fsmnt); i++) 187 fp->s_fsmnt[i] = 0; 188 clkinit(fp->s_time); 189 bootime = time; 190 } 191 192 /* 193 * Initialize the buffer I/O system by freeing 194 * all buffers and setting all device buffer lists to empty. 195 */ 196 binit() 197 { 198 register struct buf *bp; 199 register struct buf *dp; 200 register int i; 201 struct bdevsw *bdp; 202 struct swdevt *swp; 203 204 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 205 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 206 dp->b_flags = B_HEAD; 207 } 208 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 209 for (i=0; i<nbuf; i++) { 210 bp = &buf[i]; 211 bp->b_dev = NODEV; 212 bp->b_un.b_addr = buffers + i * BSIZE; 213 bp->b_back = dp; 214 bp->b_forw = dp->b_forw; 215 dp->b_forw->b_back = bp; 216 dp->b_forw = bp; 217 bp->b_flags = B_BUSY|B_INVAL; 218 brelse(bp); 219 } 220 for (bdp = bdevsw; bdp->d_open; bdp++) 221 nblkdev++; 222 /* 223 * Count swap devices, and adjust total swap space available. 224 * Some of this space will not be available until a vswapon() 225 * system is issued, usually when the system goes multi-user. 226 */ 227 nswdev = 0; 228 for (swp = swdevt; swp->sw_dev; swp++) 229 nswdev++; 230 if (nswdev == 0) 231 panic("binit"); 232 if (nswdev > 1) 233 nswap = (nswap/DMMAX)*DMMAX; 234 nswap *= nswdev; 235 maxpgio *= nswdev; 236 swfree(0); 237 } 238 239 /* 240 * Initialize linked list of free swap 241 * headers. These do not actually point 242 * to buffers, but rather to pages that 243 * are being swapped in and out. 244 */ 245 bswinit() 246 { 247 register int i; 248 register struct buf *sp = swbuf; 249 250 bswlist.av_forw = sp; 251 for (i=0; i<nswbuf-1; i++, sp++) 252 sp->av_forw = sp+1; 253 sp->av_forw = NULL; 254 } 255 256 /* 257 * Initialize clist by freeing all character blocks, then count 258 * number of character devices. (Once-only routine) 259 */ 260 cinit() 261 { 262 register int ccp; 263 register struct cblock *cp; 264 register struct cdevsw *cdp; 265 266 ccp = (int)cfree; 267 ccp = (ccp+CROUND) & ~CROUND; 268 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 269 cp->c_next = cfreelist; 270 cfreelist = cp; 271 cfreecount += CBSIZE; 272 } 273 ccp = 0; 274 for(cdp = cdevsw; cdp->d_open; cdp++) 275 ccp++; 276 nchrdev = ccp; 277 } 278