Return to vm_subr.c CVS log

Up to [CSRG BSD Unix] / 43BSDReno / sys / kern

Annotation of 43BSDReno/sys/kern/vm_subr.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)vm_subr.c   7.14 (Berkeley) 6/30/90
        !            21:  */
        !            22: 
        !            23: #include "param.h"
        !            24: #include "user.h"
        !            25: #include "vm.h"
        !            26: #include "proc.h"
        !            27: #include "vnode.h"
        !            28: #include "mount.h"
        !            29: #include "file.h"
        !            30: #include "buf.h"
        !            31: 
        !            32: #include "machine/pte.h"
        !            33: #include "machine/mtpr.h"
        !            34: 
        !            35: /*
        !            36:  * Make uarea of process p addressible at kernel virtual
        !            37:  * address uarea through sysmap locations starting at map.
        !            38:  */
        !            39: uaccess(p, map, uarea)
        !            40:        register struct proc *p;
        !            41:        struct pte *map;
        !            42:        register struct user *uarea;
        !            43: {
        !            44:        register int i;
        !            45:        register struct pte *mp = map;
        !            46: 
        !            47:        for (i = 0; i < UPAGES; i++) {
        !            48:                *(int *)mp = 0;
        !            49:                mp->pg_pfnum = p->p_addr[i].pg_pfnum;
        !            50:                mp++;
        !            51:        }
        !            52:        vmaccess(map, (caddr_t)uarea, UPAGES);
        !            53: }
        !            54: 
        !            55: /*
        !            56:  * Validate the kernel map for size ptes which
        !            57:  * start at ppte in the sysmap, and which map
        !            58:  * kernel virtual addresses starting with vaddr.
        !            59:  */
        !            60: vmaccess(ppte0, vaddr, size0)
        !            61:        struct pte *ppte0;
        !            62:        register caddr_t vaddr;
        !            63:        int size0;
        !            64: {
        !            65:        register struct pte *ppte = ppte0;
        !            66:        register int size = size0;
        !            67: 
        !            68:        while (size != 0) {
        !            69:                mapin(ppte, (u_int)vaddr, ppte->pg_pfnum, (int)(PG_V|PG_KW));
        !            70: #if defined(tahoe)
        !            71:                mtpr(P1DC, vaddr);
        !            72: #endif
        !            73:                ppte++;
        !            74:                vaddr += NBPG;
        !            75:                --size;
        !            76:        }
        !            77: #if defined(hp300)
        !            78:        DCIS();
        !            79: #endif
        !            80: #if defined(i386)
        !            81:        tlbflush();
        !            82: #endif
        !            83: }
        !            84: 
        !            85: /* 
        !            86:  * Convert a pte pointer to
        !            87:  * a virtual page number.
        !            88:  */
        !            89: ptetov(p, pte)
        !            90:        register struct proc *p;
        !            91:        struct pte *pte;
        !            92: {
        !            93:        register int j;
        !            94: 
        !            95:        j = pte - p->p_p0br;
        !            96:        if (j < p->p_tsize + p->p_dsize + p->p_mmsize)
        !            97:                return (j);
        !            98:        return ((BTOPUSRSTACK + HIGHPAGES) - p->p_szpt * NPTEPG + j);
        !            99: }
        !           100: 
        !           101: /*
        !           102:  * Initialize the page tables for paging from an inode,
        !           103:  * by scouring up the indirect blocks in order.
        !           104:  * Corresponding area of memory should have been vmemfree()d
        !           105:  * first or just created.
        !           106:  */
        !           107: vinifod(p, pte, fileno, vp, bfirst, count)
        !           108:        struct proc *p;
        !           109:        register struct fpte *pte;
        !           110:        int fileno;
        !           111:        register struct vnode *vp;
        !           112:        daddr_t bfirst;
        !           113:        segsz_t count;
        !           114: {
        !           115:        int blast = bfirst + howmany(count, CLSIZE);
        !           116:        register int i, j;
        !           117:        int bn;
        !           118:        int nclpbsize = vp->v_mount->mnt_stat.f_bsize / CLBYTES;
        !           119: 
        !           120:        /*
        !           121:         * Blocks of an executable may still be in the buffer
        !           122:         * cache, so we explicitly flush them out to disk
        !           123:         * so that the proper data will be paged in.
        !           124:         */
        !           125:        vflushbuf(vp, B_SYNC);
        !           126:        /*
        !           127:         * Map in the appropriate block numbers for each page
        !           128:         * of the executable.
        !           129:         */
        !           130:        while (bfirst < blast) {
        !           131:                i = bfirst % nclpbsize;
        !           132:                if (VOP_BMAP(vp, bfirst / nclpbsize, (struct vnode **)0, &bn)) {
        !           133:                        swkill(p, "I/O error mapping pages");
        !           134:                        return;
        !           135:                }
        !           136:                for ( ; i < nclpbsize; i++) {
        !           137:                        pte->pg_fod = 1;
        !           138:                        pte->pg_fileno = fileno;
        !           139:                        if (bn < 0) {
        !           140:                                pte->pg_blkno = 0;
        !           141:                                pte->pg_fileno = PG_FZERO;
        !           142:                                cnt.v_nzfod += CLSIZE;
        !           143:                        } else {
        !           144:                                pte->pg_blkno = bn + btodb(i * CLBYTES);
        !           145:                                cnt.v_nexfod += CLSIZE;
        !           146:                        }
        !           147:                        for (j = 1; j < CLSIZE; j++)
        !           148:                                pte[j] = pte[0];
        !           149:                        pte += CLSIZE;
        !           150:                        bfirst++;
        !           151:                        if (bfirst == blast)
        !           152:                                break;
        !           153:                }
        !           154:        }
        !           155: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.