1 /* init_main.c 4.27 82/03/14 */ 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/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 #include "loop.h" 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 cinit(); /* needed by dmc-11 driver */ 87 #ifdef INET 88 pfinit(); 89 #if NLOOP > 0 90 loattach(); /* XXX */ 91 #endif 92 ifinit(); 93 #endif 94 ihinit(); 95 bhinit(); 96 binit(); 97 bswinit(); 98 iinit(); 99 rootdir = iget(rootdev, (ino_t)ROOTINO); 100 rootdir->i_flag &= ~ILOCK; 101 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 102 u.u_cdir->i_flag &= ~ILOCK; 103 u.u_rdir = NULL; 104 u.u_dmap = zdmap; 105 u.u_smap = zdmap; 106 107 /* 108 * Set the scan rate and other parameters of the paging subsystem. 109 */ 110 setupclock(); 111 112 /* 113 * make page-out daemon (process 2) 114 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 115 * table so that it can map dirty pages into 116 * its address space during asychronous pushes. 117 */ 118 mpid = 1; 119 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 120 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 121 if (newproc(0)) { 122 proc[2].p_flag |= SLOAD|SSYS; 123 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 124 pageout(); 125 } 126 127 /* 128 * make init process and 129 * enter scheduling loop 130 */ 131 132 mpid = 0; 133 proc[1].p_stat = 0; 134 proc[0].p_szpt = CLSIZE; 135 if (newproc(0)) { 136 expand(clrnd((int)btoc(szicode)), P0BR); 137 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 138 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 139 /* 140 * Return goes to loc. 0 of user init 141 * code just copied out. 142 */ 143 return; 144 } 145 proc[0].p_szpt = 1; 146 sched(); 147 } 148 149 /* 150 * iinit is called once (from main) 151 * very early in initialization. 152 * It reads the root's super block 153 * and initializes the current date 154 * from the last modified date. 155 * 156 * panic: iinit -- cannot read the super 157 * block. Usually because of an IO error. 158 */ 159 iinit() 160 { 161 register struct buf *bp; 162 register struct filsys *fp; 163 register int i; 164 165 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 166 bp = bread(rootdev, SUPERB); 167 if(u.u_error) 168 panic("iinit"); 169 bp->b_flags |= B_LOCKED; /* block can never be re-used */ 170 brelse(bp); 171 mount[0].m_dev = rootdev; 172 mount[0].m_bufp = bp; 173 fp = bp->b_un.b_filsys; 174 fp->s_flock = 0; 175 fp->s_ilock = 0; 176 fp->s_ronly = 0; 177 fp->s_lasti = 1; 178 fp->s_nbehind = 0; 179 fp->s_fsmnt[0] = '/'; 180 for (i = 1; i < sizeof(fp->s_fsmnt); i++) 181 fp->s_fsmnt[i] = 0; 182 clkinit(fp->s_time); 183 bootime = time; 184 } 185 186 /* 187 * Initialize the buffer I/O system by freeing 188 * all buffers and setting all device buffer lists to empty. 189 */ 190 binit() 191 { 192 register struct buf *bp; 193 register struct buf *dp; 194 register int i; 195 struct bdevsw *bdp; 196 struct swdevt *swp; 197 198 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 199 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 200 dp->b_flags = B_HEAD; 201 } 202 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 203 for (i=0; i<nbuf; i++) { 204 bp = &buf[i]; 205 bp->b_dev = NODEV; 206 bp->b_un.b_addr = buffers + i * BSIZE; 207 bp->b_back = dp; 208 bp->b_forw = dp->b_forw; 209 dp->b_forw->b_back = bp; 210 dp->b_forw = bp; 211 bp->b_flags = B_BUSY|B_INVAL; 212 brelse(bp); 213 } 214 for (bdp = bdevsw; bdp->d_open; bdp++) 215 nblkdev++; 216 /* 217 * Count swap devices, and adjust total swap space available. 218 * Some of this space will not be available until a vswapon() 219 * system is issued, usually when the system goes multi-user. 220 */ 221 nswdev = 0; 222 for (swp = swdevt; swp->sw_dev; swp++) 223 nswdev++; 224 if (nswdev == 0) 225 panic("binit"); 226 if (nswdev > 1) 227 nswap = (nswap/DMMAX)*DMMAX; 228 nswap *= nswdev; 229 maxpgio *= nswdev; 230 swfree(0); 231 } 232 233 /* 234 * Initialize linked list of free swap 235 * headers. These do not actually point 236 * to buffers, but rather to pages that 237 * are being swapped in and out. 238 */ 239 bswinit() 240 { 241 register int i; 242 register struct buf *sp = swbuf; 243 244 bswlist.av_forw = sp; 245 for (i=0; i<nswbuf-1; i++, sp++) 246 sp->av_forw = sp+1; 247 sp->av_forw = NULL; 248 } 249 250 /* 251 * Initialize clist by freeing all character blocks, then count 252 * number of character devices. (Once-only routine) 253 */ 254 cinit() 255 { 256 register int ccp; 257 register struct cblock *cp; 258 register struct cdevsw *cdp; 259 260 ccp = (int)cfree; 261 ccp = (ccp+CROUND) & ~CROUND; 262 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 263 cp->c_next = cfreelist; 264 cfreelist = cp; 265 cfreecount += CBSIZE; 266 } 267 ccp = 0; 268 for(cdp = cdevsw; cdp->d_open; cdp++) 269 ccp++; 270 nchrdev = ccp; 271 } 272