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Annotation of XNU/bsd/dev/i386/mem.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /*-
        !            23:  * Copyright (c) 1988 University of Utah.
        !            24:  * Copyright (c) 1982, 1986, 1990, 1993
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  * This code is derived from software contributed to Berkeley by
        !            28:  * the Systems Programming Group of the University of Utah Computer
        !            29:  * Science Department, and code derived from software contributed to
        !            30:  * Berkeley by William Jolitz.
        !            31:  *
        !            32:  * Redistribution and use in source and binary forms, with or without
        !            33:  * modification, are permitted provided that the following conditions
        !            34:  * are met:
        !            35:  * 1. Redistributions of source code must retain the above copyright
        !            36:  *    notice, this list of conditions and the following disclaimer.
        !            37:  * 2. Redistributions in binary form must reproduce the above copyright
        !            38:  *    notice, this list of conditions and the following disclaimer in the
        !            39:  *    documentation and/or other materials provided with the distribution.
        !            40:  * 3. All advertising materials mentioning features or use of this software
        !            41:  *    must display the following acknowledgement:
        !            42:  *     This product includes software developed by the University of
        !            43:  *     California, Berkeley and its contributors.
        !            44:  * 4. Neither the name of the University nor the names of its contributors
        !            45:  *    may be used to endorse or promote products derived from this software
        !            46:  *    without specific prior written permission.
        !            47:  *
        !            48:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            49:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            50:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            51:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            52:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            53:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            54:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            55:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            56:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            57:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            58:  * SUCH DAMAGE.
        !            59:  *
        !            60:  * from: Utah $Hdr: mem.c 1.13 89/10/08$
        !            61:  *     @(#)mem.c       8.1 (Berkeley) 6/11/93
        !            62:  */
        !            63: 
        !            64: #include <mach_load.h>
        !            65: 
        !            66: /*
        !            67:  * Memory special file
        !            68:  */
        !            69: 
        !            70: #include <sys/param.h>
        !            71: #include <sys/dir.h>
        !            72: #include <sys/proc.h>
        !            73: #include <sys/buf.h>
        !            74: #include <sys/systm.h>
        !            75: #include <sys/vm.h>
        !            76: #include <sys/uio.h>
        !            77: 
        !            78: #include <mach/vm_types.h>
        !            79: #include <mach/vm_param.h>
        !            80: #include <vm/vm_kern.h>                /* for kernel_map */
        !            81: 
        !            82: mmread(dev, uio)
        !            83:        dev_t dev;
        !            84:        struct uio *uio;
        !            85: {
        !            86: 
        !            87:        return (mmrw(dev, uio, UIO_READ));
        !            88: }
        !            89: 
        !            90: mmwrite(dev, uio)
        !            91:        dev_t dev;
        !            92:        struct uio *uio;
        !            93: {
        !            94: 
        !            95:        return (mmrw(dev, uio, UIO_WRITE));
        !            96: }
        !            97: 
        !            98: mmrw(dev, uio, rw)
        !            99:        dev_t dev;
        !           100:        struct uio *uio;
        !           101:        enum uio_rw rw;
        !           102: {
        !           103:        register int o;
        !           104:        register u_int c, v;
        !           105:        register struct iovec *iov;
        !           106:        int error = 0;
        !           107:        vm_offset_t     where;
        !           108:        int             spl;
        !           109:        vm_size_t size;
        !           110:        extern boolean_t kernacc(off_t, size_t );
        !           111: 
        !           112:        while (uio->uio_resid > 0 && error == 0) {
        !           113:                iov = uio->uio_iov;
        !           114:                if (iov->iov_len == 0) {
        !           115:                        uio->uio_iov++;
        !           116:                        uio->uio_iovcnt--;
        !           117:                        if (uio->uio_iovcnt < 0)
        !           118:                                panic("mmrw");
        !           119:                        continue;
        !           120:                }
        !           121:                switch (minor(dev)) {
        !           122: 
        !           123: /* minor device 0 is physical memory */
        !           124:                case 0:
        !           125:                        v = trunc_page(uio->uio_offset);
        !           126:                        if (uio->uio_offset >= mem_size)
        !           127:                                goto fault;
        !           128: 
        !           129:                        size= PAGE_SIZE;
        !           130:                        if (kmem_alloc(kernel_map, &where, size) 
        !           131:                                != KERN_SUCCESS) {
        !           132:                                goto fault;
        !           133:                        }
        !           134:                        o = uio->uio_offset - v;
        !           135:                        c = min(PAGE_SIZE - o, (u_int)iov->iov_len);
        !           136:                        error = uiomove((caddr_t) (where + o), c, uio);
        !           137:                        kmem_free(kernel_map, where, PAGE_SIZE);
        !           138:                        continue;
        !           139: 
        !           140: /* minor device 1 is kernel memory */
        !           141:                case 1:
        !           142:                        /* Do some sanity checking */
        !           143:                        if (((vm_address_t)uio->uio_offset >= VM_MAX_KERNEL_ADDRESS) ||
        !           144:                                ((vm_address_t)uio->uio_offset <= VM_MIN_KERNEL_ADDRESS))
        !           145:                                goto fault;
        !           146:                        c = iov->iov_len;
        !           147:                        if (!kernacc(uio->uio_offset, c))
        !           148:                                goto fault;
        !           149:                        error = uiomove((caddr_t)uio->uio_offset, (int)c, uio);
        !           150:                        continue;
        !           151: 
        !           152: /* minor device 2 is EOF/RATHOLE */
        !           153:                case 2:
        !           154:                        if (rw == UIO_READ)
        !           155:                                return (0);
        !           156:                        c = iov->iov_len;
        !           157:                        break;
        !           158:                default:
        !           159:                        goto fault;
        !           160:                        break;
        !           161:                }
        !           162:                        
        !           163:                if (error)
        !           164:                        break;
        !           165:                iov->iov_base += c;
        !           166:                iov->iov_len -= c;
        !           167:                uio->uio_offset += c;
        !           168:                uio->uio_resid -= c;
        !           169:        }
        !           170:        return (error);
        !           171: fault:
        !           172:        return (EFAULT);
        !           173: }
        !           174: 
        !           175: 
        !           176: boolean_t
        !           177: kernacc(
        !           178:     off_t      start,
        !           179:     size_t     len
        !           180: )
        !           181: {
        !           182:        off_t base;
        !           183:        off_t end;
        !           184:     
        !           185:        base = trunc_page(start);
        !           186:        end = start + len;
        !           187:        
        !           188:        while (base < end) {
        !           189:                if(kvtophys((vm_offset_t)base) == NULL)
        !           190:                        return(FALSE);
        !           191:                base += page_size;
        !           192:        }   
        !           193: 
        !           194:        return (TRUE);
        !           195: }

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