/* main.c 4.14 81/04/23 */ #include "../h/param.h" #include "../h/systm.h" #include "../h/dir.h" #include "../h/user.h" #include "../h/filsys.h" #include "../h/mount.h" #include "../h/map.h" #include "../h/proc.h" #include "../h/inode.h" #include "../h/seg.h" #include "../h/conf.h" #include "../h/buf.h" #include "../h/mtpr.h" #include "../h/pte.h" #include "../h/clock.h" #include "../h/vm.h" #include "../h/cmap.h" #include "../h/text.h" #include "../h/vlimit.h" #include "../h/clist.h" /* * Initialization code. * Called from cold start routine as * soon as a stack and segmentation * have been established. * Functions: * clear and free user core * turn on clock * hand craft 0th process * call all initialization routines * fork - process 0 to schedule * - process 2 to page out * - process 1 execute bootstrap * * loop at loc 13 (0xd) in user mode -- /etc/init * cannot be executed. */ main(firstaddr) { register int i; register struct proc *p; rqinit(); startup(firstaddr); /* * set up system process 0 (swapper) */ p = &proc[0]; p->p_p0br = (struct pte *)mfpr(P0BR); p->p_szpt = 1; p->p_addr = uaddr(p); p->p_stat = SRUN; p->p_flag |= SLOAD|SSYS; p->p_nice = NZERO; setredzone(p->p_addr, (caddr_t)&u); u.u_procp = p; u.u_cmask = CMASK; for (i = 1; i < sizeof(u.u_limit)/sizeof(u.u_limit[0]); i++) switch (i) { case LIM_STACK: u.u_limit[i] = 512*1024; continue; case LIM_DATA: u.u_limit[i] = ctob(MAXDSIZ); continue; default: u.u_limit[i] = INFINITY; continue; } p->p_maxrss = INFINITY/NBPG; clkstart(); /* * Initialize devices and * set up 'known' i-nodes */ ihinit(); bhinit(); cinit(); binit(); bswinit(); iinit(); rootdir = iget(rootdev, (ino_t)ROOTINO); rootdir->i_flag &= ~ILOCK; u.u_cdir = iget(rootdev, (ino_t)ROOTINO); u.u_cdir->i_flag &= ~ILOCK; u.u_rdir = NULL; u.u_dmap = zdmap; u.u_smap = zdmap; /* * Set the scan rate and other parameters of the paging subsystem. */ setupclock(); /* * make page-out daemon (process 2) * the daemon has ctopt(nswbuf*CLSIZE*KLMAX) pages of page * table so that it can map dirty pages into * its address space during asychronous pushes. */ mpid = 1; proc[0].p_szpt = clrnd(ctopt(nswbuf*CLSIZE*KLMAX + UPAGES)); proc[1].p_stat = SZOMB; /* force it to be in proc slot 2 */ if (newproc(0)) { proc[2].p_flag |= SLOAD|SSYS; proc[2].p_dsize = u.u_dsize = nswbuf*CLSIZE*KLMAX; pageout(); } /* * make init process and * enter scheduling loop */ mpid = 0; proc[1].p_stat = 0; proc[0].p_szpt = CLSIZE; if (newproc(0)) { expand(clrnd((int)btoc(szicode)), P0BR); (void) swpexpand(u.u_dsize, 0, &u.u_dmap, &u.u_smap); (void) copyout((caddr_t)icode, (caddr_t)0, (unsigned)szicode); /* * Return goes to loc. 0 of user init * code just copied out. */ return; } #ifdef BBNNET /* * Initialize bbn network. */ netmain(); #endif BBNNET proc[0].p_szpt = 1; sched(); } /* * iinit is called once (from main) * very early in initialization. * It reads the root's super block * and initializes the current date * from the last modified date. * * panic: iinit -- cannot read the super * block. Usually because of an IO error. */ iinit() { register struct buf *bp; register struct filsys *fp; register int i; (*bdevsw[major(rootdev)].d_open)(rootdev, 1); bp = bread(rootdev, SUPERB); if(u.u_error) panic("iinit"); bp->b_flags |= B_LOCKED; /* block can never be re-used */ brelse(bp); mount[0].m_dev = rootdev; mount[0].m_bufp = bp; fp = bp->b_un.b_filsys; fp->s_flock = 0; fp->s_ilock = 0; fp->s_ronly = 0; fp->s_lasti = 1; fp->s_nbehind = 0; fp->s_fsmnt[0] = '/'; for (i = 1; i < sizeof(fp->s_fsmnt); i++) fp->s_fsmnt[i] = 0; clkinit(fp->s_time); bootime = time; } /* * Initialize the buffer I/O system by freeing * all buffers and setting all device buffer lists to empty. */ binit() { register struct buf *bp; register struct buf *dp; register int i; struct bdevsw *bdp; struct swdevt *swp; for (dp = bfreelist; dp < &bfreelist[BQUEUES]; dp++) { dp->b_forw = dp->b_back = dp->av_forw = dp->av_back = dp; dp->b_flags = B_HEAD; } dp--; /* dp = &bfreelist[BQUEUES-1]; */ for (i=0; i<nbuf; i++) { bp = &buf[i]; bp->b_dev = NODEV; bp->b_un.b_addr = buffers + i * BSIZE; bp->b_back = dp; bp->b_forw = dp->b_forw; dp->b_forw->b_back = bp; dp->b_forw = bp; bp->b_flags = B_BUSY|B_INVAL; brelse(bp); } for (bdp = bdevsw; bdp->d_open; bdp++) nblkdev++; /* * Count swap devices, and adjust total swap space available. * Some of this space will not be available until a vswapon() * system is issued, usually when the system goes multi-user. */ nswdev = 0; for (swp = swdevt; swp->sw_dev; swp++) nswdev++; if (nswdev == 0) panic("binit"); nswap *= nswdev; maxpgio *= nswdev; swfree(0); } /* * Initialize linked list of free swap * headers. These do not actually point * to buffers, but rather to pages that * are being swapped in and out. */ bswinit() { register int i; register struct buf *sp = swbuf; bswlist.av_forw = sp; for (i=0; i<nswbuf-1; i++, sp++) sp->av_forw = sp+1; sp->av_forw = NULL; } /* * Initialize clist by freeing all character blocks, then count * number of character devices. (Once-only routine) */ cinit() { register int ccp; register struct cblock *cp; register struct cdevsw *cdp; ccp = (int)cfree; ccp = (ccp+CROUND) & ~CROUND; for(cp=(struct cblock *)ccp; cp < &cfree[nclist-1]; cp++) { cp->c_next = cfreelist; cfreelist = cp; cfreecount += CBSIZE; } ccp = 0; for(cdp = cdevsw; cdp->d_open; cdp++) ccp++; nchrdev = ccp; }