1 /* init_main.c 3.7 07/06/80 */ 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 42 cpusid = mfpr(SID); /* get system identification */ 43 #ifdef FASTVAX 44 rqinit(); 45 #endif 46 startup(firstaddr); 47 if (lotsfree == 0) 48 lotsfree = LOTSFREE; 49 50 /* 51 * set up system process 0 (swapper) 52 */ 53 54 proc[0].p_p0br = (struct pte *)mfpr(P0BR); 55 proc[0].p_szpt = 1; 56 proc[0].p_addr = uaddr(&proc[0]); 57 proc[0].p_stat = SRUN; 58 proc[0].p_flag |= SLOAD|SSYS; 59 proc[0].p_nice = NZERO; 60 u.u_procp = &proc[0]; 61 u.u_cmask = CMASK; 62 clkstart(); 63 64 /* 65 * Initialize devices and 66 * set up 'known' i-nodes 67 */ 68 69 ihinit(); 70 bhinit(); 71 cinit(); 72 binit(); 73 bswinit(); 74 iinit(); 75 rootdir = iget(rootdev, (ino_t)ROOTINO); 76 rootdir->i_flag &= ~ILOCK; 77 u.u_cdir = iget(rootdev, (ino_t)ROOTINO); 78 u.u_cdir->i_flag &= ~ILOCK; 79 u.u_rdir = NULL; 80 u.u_dmap = zdmap; 81 u.u_smap = zdmap; 82 83 /* 84 * make page-out daemon (process 2) 85 * the daemon has ctopt(NSWBUF*CLSIZE*KLMAX) pages of page 86 * table so that it can map dirty pages into 87 * its address space during asychronous pushes. 88 */ 89 90 mpid = 1; 91 proc[0].p_szpt = clrnd(ctopt(NSWBUF*CLSIZE*KLMAX + UPAGES)); 92 proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ 93 if (newproc(0)) { 94 proc[2].p_flag |= SLOAD|SSYS; 95 proc[2].p_dsize = u.u_dsize = NSWBUF*CLSIZE*KLMAX; 96 pageout(); 97 } 98 99 /* 100 * make init process and 101 * enter scheduling loop 102 */ 103 104 mpid = 0; 105 proc[1].p_stat = 0; 106 proc[0].p_szpt = CLSIZE; 107 if (newproc(0)) { 108 expand(clrnd((int)btoc(szicode)), P0BR); 109 swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); 110 (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); 111 /* 112 * Return goes to loc. 0 of user init 113 * code just copied out. 114 */ 115 return; 116 } 117 proc[0].p_szpt = 1; 118 sched(); 119 } 120 121 /* 122 * iinit is called once (from main) 123 * very early in initialization. 124 * It reads the root's super block 125 * and initializes the current date 126 * from the last modified date. 127 * 128 * panic: iinit -- cannot read the super 129 * block. Usually because of an IO error. 130 */ 131 iinit() 132 { 133 register struct buf *cp, *bp; 134 register struct filsys *fp; 135 register unsigned i, j; 136 137 (*bdevsw[major(rootdev)].d_open)(rootdev, 1); 138 bp = bread(rootdev, SUPERB); 139 cp = geteblk(); 140 if(u.u_error) 141 panic("iinit"); 142 bcopy(bp->b_un.b_addr, cp->b_un.b_addr, sizeof(struct filsys)); 143 brelse(bp); 144 mount[0].m_bufp = cp; 145 mount[0].m_dev = rootdev; 146 fp = cp->b_un.b_filsys; 147 fp->s_flock = 0; 148 fp->s_ilock = 0; 149 fp->s_ronly = 0; 150 fp->s_lasti = 1; 151 fp->s_nbehind = 0; 152 /* on boot, read VAX TODR register (GMT 10 ms. 153 * clicks into current year) and set software time 154 * in 'int time' (GMT seconds since year YRREF) 155 */ 156 for (i = 0 , j = YRREF ; j < YRCURR ; j++) 157 i += (SECYR + (j%4?0:SECDAY)) ; 158 time = udiv(mfpr(TODR),100) + i ; 159 bootime = time; 160 } 161 162 /* 163 * This is the set of buffers proper, whose heads 164 * were declared in buf.h. There can exist buffer 165 * headers not pointing here that are used purely 166 * as arguments to the I/O routines to describe 167 * I/O to be done-- e.g. swap headers swbuf[] for 168 * swapping. 169 */ 170 char buffers[NBUF][BSIZE]; 171 172 /* 173 * Initialize the buffer I/O system by freeing 174 * all buffers and setting all device buffer lists to empty. 175 * 176 * SHOULD USE MEMALL HERE!!! 177 */ 178 binit() 179 { 180 register struct buf *bp; 181 register struct buf *dp; 182 register int i; 183 struct bdevsw *bdp; 184 struct swdevt *swp; 185 186 bfreelist.b_forw = bfreelist.b_back = 187 bfreelist.av_forw = bfreelist.av_back = &bfreelist; 188 for (i=0; i<NBUF; i++) { 189 bp = &buf[i]; 190 bp->b_dev = NODEV; 191 bp->b_un.b_addr = buffers[i]; 192 bp->b_back = &bfreelist; 193 bp->b_forw = bfreelist.b_forw; 194 bfreelist.b_forw->b_back = bp; 195 bfreelist.b_forw = bp; 196 bp->b_flags = B_BUSY; 197 brelse(bp); 198 } 199 for (bdp = bdevsw; bdp->d_open; bdp++) { 200 dp = bdp->d_tab; 201 if(dp) { 202 dp->b_forw = dp; 203 dp->b_back = dp; 204 } 205 nblkdev++; 206 } 207 /* 208 * Count swap devices, and adjust total swap space available. 209 * Some of this space will not be available until a vswapon() 210 * system is issued, usually when the system goes multi-user. 211 */ 212 nswdev = 0; 213 for (swp = swdevt; swp->sw_dev; swp++) 214 nswdev++; 215 if (nswdev == 0) 216 panic("binit"); 217 nswap *= nswdev; 218 maxpgio *= nswdev; 219 swfree(0); 220 } 221 222 /* 223 * Initialize linked list of free swap 224 * headers. These do not actually point 225 * to buffers, but rather to pages that 226 * are being swapped in and out. 227 */ 228 bswinit() 229 { 230 register int i; 231 232 bswlist.av_forw = &swbuf[0]; 233 for (i=0; i<NSWBUF-1; i++) 234 swbuf[i].av_forw = &swbuf[i+1]; 235 swbuf[NSWBUF-1].av_forw = NULL; 236 } 237