1 /* init_main.c 3.8 07/12/80 */ 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 22 /* 23 * Initialization code. 24 * Called from cold start routine as 25 * soon as a stack and segmentation 26 * have been established. 27 * Functions: 28 * clear and free user core 29 * turn on clock 30 * hand craft 0th process 31 * call all initialization routines 32 * fork - process 0 to schedule 33 * - process 2 to page out 34 * - process 1 execute bootstrap 35 * 36 * loop at loc 13 (0xd) in user mode -- /etc/init 37 * cannot be executed. 38 */ 39 main(firstaddr) 40 { 41 register int i; 42 43 cpusid = mfpr(SID); /* get system identification */ 44 #ifdef FASTVAX 45 rqinit(); 46 #endif 47 startup(firstaddr); 48 if (lotsfree == 0) 49 lotsfree = LOTSFREE; 50 51 /* 52 * set up system process 0 (swapper) 53 */ 54 55 proc[0].p_p0br = (struct pte *)mfpr(P0BR); 56 proc[0].p_szpt = 1; 57 proc[0].p_addr = uaddr(&proc[0]); 58 proc[0].p_stat = SRUN; 59 proc[0].p_flag |= SLOAD|SSYS; 60 proc[0].p_nice = NZERO; 61 u.u_procp = &proc[0]; 62 u.u_cmask = CMASK; 63 for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) 64 u.u_limit[i] = INFINITY; 65 clkstart(); 66 67 /* 68 * Initialize devices and 69 * set up 'known' i-nodes 70 */ 71 72 ihinit(); 73 bhinit(); 74 cinit(); 75 binit(); 76 bswinit(); 77 iinit(); 78 rootdir = iget(rootdev, (ino_t)ROOTINO); 79 rootdir->i_flag &= ~ILOCK; 80 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 81 u.u_cdir->i_flag &= ~ILOCK; 82 u.u_rdir = NULL; 83 u.u_dmap = zdmap; 84 u.u_smap = zdmap; 85 86 /* 87 * make page-out daemon (process 2) 88 * the daemon has ctopt(NSWBUF*CLSIZE*KLMAX) pages of page 89 * table so that it can map dirty pages into 90 * its address space during asychronous pushes. 91 */ 92 93 mpid = 1; 94 proc[0].p_szpt = clrnd(ctopt(NSWBUF*CLSIZE*KLMAX + UPAGES)); 95 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 96 if (newproc(0)) { 97 proc[2].p_flag |= SLOAD|SSYS; 98 proc[2].p_dsize = u.u_dsize = NSWBUF*CLSIZE*KLMAX; 99 pageout(); 100 } 101 102 /* 103 * make init process and 104 * enter scheduling loop 105 */ 106 107 mpid = 0; 108 proc[1].p_stat = 0; 109 proc[0].p_szpt = CLSIZE; 110 if (newproc(0)) { 111 expand(clrnd((int)btoc(szicode)), P0BR); 112 swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 113 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 114 /* 115 * Return goes to loc. 0 of user init 116 * code just copied out. 117 */ 118 return; 119 } 120 proc[0].p_szpt = 1; 121 sched(); 122 } 123 124 /* 125 * iinit is called once (from main) 126 * very early in initialization. 127 * It reads the root's super block 128 * and initializes the current date 129 * from the last modified date. 130 * 131 * panic: iinit -- cannot read the super 132 * block. Usually because of an IO error. 133 */ 134 iinit() 135 { 136 register struct buf *cp, *bp; 137 register struct filsys *fp; 138 register unsigned i, j; 139 140 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 141 bp = bread(rootdev, SUPERB); 142 cp = geteblk(); 143 if(u.u_error) 144 panic("iinit"); 145 bcopy(bp->b_un.b_addr, cp->b_un.b_addr, sizeof(struct filsys)); 146 brelse(bp); 147 mount[0].m_bufp = cp; 148 mount[0].m_dev = rootdev; 149 fp = cp->b_un.b_filsys; 150 fp->s_flock = 0; 151 fp->s_ilock = 0; 152 fp->s_ronly = 0; 153 fp->s_lasti = 1; 154 fp->s_nbehind = 0; 155 /* on boot, read VAX TODR register (GMT 10 ms. 156 * clicks into current year) and set software time 157 * in 'int time' (GMT seconds since year YRREF) 158 */ 159 for (i = 0 , j = YRREF ; j < YRCURR ; j++) 160 i += (SECYR + (j%4?0:SECDAY)) ; 161 time = udiv(mfpr(TODR),100) + i ; 162 bootime = time; 163 } 164 165 /* 166 * This is the set of buffers proper, whose heads 167 * were declared in buf.h. There can exist buffer 168 * headers not pointing here that are used purely 169 * as arguments to the I/O routines to describe 170 * I/O to be done-- e.g. swap headers swbuf[] for 171 * swapping. 172 */ 173 char buffers[NBUF][BSIZE]; 174 175 /* 176 * Initialize the buffer I/O system by freeing 177 * all buffers and setting all device buffer lists to empty. 178 * 179 * SHOULD USE MEMALL HERE!!! 180 */ 181 binit() 182 { 183 register struct buf *bp; 184 register struct buf *dp; 185 register int i; 186 struct bdevsw *bdp; 187 struct swdevt *swp; 188 189 bfreelist.b_forw = bfreelist.b_back = 190 bfreelist.av_forw = bfreelist.av_back = &bfreelist; 191 for (i=0; i<NBUF; i++) { 192 bp = &buf[i]; 193 bp->b_dev = NODEV; 194 bp->b_un.b_addr = buffers[i]; 195 bp->b_back = &bfreelist; 196 bp->b_forw = bfreelist.b_forw; 197 bfreelist.b_forw->b_back = bp; 198 bfreelist.b_forw = bp; 199 bp->b_flags = B_BUSY; 200 brelse(bp); 201 } 202 for (bdp = bdevsw; bdp->d_open; bdp++) { 203 dp = bdp->d_tab; 204 if(dp) { 205 dp->b_forw = dp; 206 dp->b_back = dp; 207 } 208 nblkdev++; 209 } 210 /* 211 * Count swap devices, and adjust total swap space available. 212 * Some of this space will not be available until a vswapon() 213 * system is issued, usually when the system goes multi-user. 214 */ 215 nswdev = 0; 216 for (swp = swdevt; swp->sw_dev; swp++) 217 nswdev++; 218 if (nswdev == 0) 219 panic("binit"); 220 nswap *= nswdev; 221 maxpgio *= nswdev; 222 swfree(0); 223 } 224 225 /* 226 * Initialize linked list of free swap 227 * headers. These do not actually point 228 * to buffers, but rather to pages that 229 * are being swapped in and out. 230 */ 231 bswinit() 232 { 233 register int i; 234 235 bswlist.av_forw = &swbuf[0]; 236 for (i=0; i<NSWBUF-1; i++) 237 swbuf[i].av_forw = &swbuf[i+1]; 238 swbuf[NSWBUF-1].av_forw = NULL; 239 } 240