1 /* init_main.c 4.29 82/04/19 */ 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 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 *fsp; 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 < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) 68 switch (i) { 69 70 case LIM_STACK: 71 u.u_limit[i] = 512*1024; 72 continue; 73 case LIM_DATA: 74 u.u_limit[i] = ctob(MAXDSIZ); 75 continue; 76 default: 77 u.u_limit[i] = INFINITY; 78 continue; 79 } 80 p->p_maxrss = INFINITY/NBPG; 81 clkstart(); 82 83 /* 84 * Initialize tables, protocols, and set up well-known inodes. 85 */ 86 mbinit(); 87 cinit(); /* needed by dmc-11 driver */ 88 #ifdef INET 89 #if NLOOP > 0 90 loattach(); /* XXX */ 91 #endif 92 ifinit(); 93 pfinit(); /* must follow interfaces */ 94 #endif 95 ihinit(); 96 bhinit(); 97 binit(); 98 bswinit(); 99 iinit(); 100 fsp = getfs(rootdev); 101 rootdir = iget(rootdev, fsp, (ino_t)ROOTINO); 102 rootdir->i_flag &= ~ILOCK; 103 u.u_cdir = iget(rootdev, fsp, (ino_t)ROOTINO); 104 u.u_cdir->i_flag &= ~ILOCK; 105 u.u_rdir = NULL; 106 u.u_dmap = zdmap; 107 u.u_smap = zdmap; 108 109 /* 110 * Set the scan rate and other parameters of the paging subsystem. 111 */ 112 setupclock(); 113 114 /* 115 * make page-out daemon (process 2) 116 * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page 117 * table so that it can map dirty pages into 118 * its address space during asychronous pushes. 119 */ 120 mpid = 1; 121 proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); 122 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 123 if (newproc(0)) { 124 proc[2].p_flag |= SLOAD|SSYS; 125 proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; 126 pageout(); 127 } 128 129 /* 130 * make init process and 131 * enter scheduling loop 132 */ 133 134 mpid = 0; 135 proc[1].p_stat = 0; 136 proc[0].p_szpt = CLSIZE; 137 if (newproc(0)) { 138 expand(clrnd((int)btoc(szicode)), P0BR); 139 (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 140 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 141 /* 142 * Return goes to loc. 0 of user init 143 * code just copied out. 144 */ 145 return; 146 } 147 proc[0].p_szpt = 1; 148 sched(); 149 } 150 151 /* 152 * iinit is called once (from main) 153 * very early in initialization. 154 * It reads the root's super block 155 * and initializes the current date 156 * from the last modified date. 157 * 158 * panic: iinit -- cannot read the super 159 * block. Usually because of an IO error. 160 */ 161 iinit() 162 { 163 register struct buf *bp; 164 register struct fs *fp; 165 register int i; 166 int blks; 167 168 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 169 bp = bread(rootdev, SBLOCK, SBSIZE); 170 if(u.u_error) 171 panic("iinit"); 172 bp->b_flags |= B_LOCKED; /* block can never be re-used */ 173 brelse(bp); 174 mount[0].m_dev = rootdev; 175 mount[0].m_bufp = bp; 176 fp = bp->b_un.b_fs; 177 if (fp->fs_magic != FS_MAGIC) 178 panic("root bad magic number"); 179 if (fp->fs_bsize > MAXBSIZE) 180 panic("root fs_bsize too big"); 181 fp->fs_ronly = 0; 182 fp->fs_fsmnt[0] = '/'; 183 for (i = 1; i < sizeof(fp->fs_fsmnt); i++) 184 fp->fs_fsmnt[i] = 0; 185 blks = howmany(fp->fs_cssize, fp->fs_fsize); 186 for (i = 0; i < blks; i += fp->fs_frag) { 187 bp = bread(rootdev, fsbtodb(fp, fp->fs_csaddr + i), 188 blks - i < fp->fs_frag ? 189 (blks - i) * fp->fs_fsize : 190 fp->fs_bsize); 191 if (u.u_error) 192 panic("root can't read csum"); 193 fp->fs_csp[i / fp->fs_frag] = bp->b_un.b_cs; 194 bp->b_flags |= B_LOCKED; 195 brelse(bp); 196 } 197 } 198 199 /* 200 * Initialize the buffer I/O system by freeing 201 * all buffers and setting all device buffer lists to empty. 202 */ 203 binit() 204 { 205 register struct buf *bp; 206 register struct buf *dp; 207 register int i; 208 struct bdevsw *bdp; 209 struct swdevt *swp; 210 211 for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { 212 dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; 213 dp->b_flags = B_HEAD; 214 } 215 dp--; /* dp = &bfreelist[BQUEUES-1]; */ 216 for (i = 0; i < nbuf; i++) { 217 bp = &buf[i]; 218 bp->b_dev = NODEV; 219 bp->b_un.b_addr = buffers + i * MAXBSIZE; 220 bp->b_bcount = MAXBSIZE; 221 bp->b_back = dp; 222 bp->b_forw = dp->b_forw; 223 dp->b_forw->b_back = bp; 224 dp->b_forw = bp; 225 bp->b_flags = B_BUSY|B_INVAL; 226 brelse(bp); 227 } 228 for (bdp = bdevsw; bdp->d_open; bdp++) 229 nblkdev++; 230 /* 231 * Count swap devices, and adjust total swap space available. 232 * Some of this space will not be available until a vswapon() 233 * system is issued, usually when the system goes multi-user. 234 */ 235 nswdev = 0; 236 for (swp = swdevt; swp->sw_dev; swp++) 237 nswdev++; 238 if (nswdev == 0) 239 panic("binit"); 240 if (nswdev > 1) 241 nswap = (nswap/DMMAX)*DMMAX; 242 nswap *= nswdev; 243 maxpgio *= nswdev; 244 swfree(0); 245 } 246 247 /* 248 * Initialize linked list of free swap 249 * headers. These do not actually point 250 * to buffers, but rather to pages that 251 * are being swapped in and out. 252 */ 253 bswinit() 254 { 255 register int i; 256 register struct buf *sp = swbuf; 257 258 bswlist.av_forw = sp; 259 for (i=0; i<nswbuf-1; i++, sp++) 260 sp->av_forw = sp+1; 261 sp->av_forw = NULL; 262 } 263 264 /* 265 * Initialize clist by freeing all character blocks, then count 266 * number of character devices. (Once-only routine) 267 */ 268 cinit() 269 { 270 register int ccp; 271 register struct cblock *cp; 272 register struct cdevsw *cdp; 273 274 ccp = (int)cfree; 275 ccp = (ccp+CROUND) & ~CROUND; 276 for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { 277 cp->c_next = cfreelist; 278 cfreelist = cp; 279 cfreecount += CBSIZE; 280 } 281 ccp = 0; 282 for(cdp = cdevsw; cdp->d_open; cdp++) 283 ccp++; 284 nchrdev = ccp; 285 } 286