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Annotation of XNU/osfmk/i386/phys.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:  * @OSF_COPYRIGHT@
        !            24:  */
        !            25: /* 
        !            26:  * Mach Operating System
        !            27:  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
        !            28:  * All Rights Reserved.
        !            29:  * 
        !            30:  * Permission to use, copy, modify and distribute this software and its
        !            31:  * documentation is hereby granted, provided that both the copyright
        !            32:  * notice and this permission notice appear in all copies of the
        !            33:  * software, derivative works or modified versions, and any portions
        !            34:  * thereof, and that both notices appear in supporting documentation.
        !            35:  * 
        !            36:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
        !            37:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
        !            38:  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
        !            39:  * 
        !            40:  * Carnegie Mellon requests users of this software to return to
        !            41:  * 
        !            42:  *  Software Distribution Coordinator  or  [email protected]
        !            43:  *  School of Computer Science
        !            44:  *  Carnegie Mellon University
        !            45:  *  Pittsburgh PA 15213-3890
        !            46:  * 
        !            47:  * any improvements or extensions that they make and grant Carnegie Mellon
        !            48:  * the rights to redistribute these changes.
        !            49:  */
        !            50: #include <string.h>
        !            51: 
        !            52: #include <mach/vm_param.h>
        !            53: #include <mach/boolean.h>
        !            54: #include <vm/pmap.h>
        !            55: #include <vm/vm_page.h>
        !            56: #include <kern/misc_protos.h>
        !            57: 
        !            58: /*
        !            59:  *     pmap_zero_page zeros the specified (machine independent) page.
        !            60:  */
        !            61: void
        !            62: pmap_zero_page(
        !            63:        vm_offset_t p)
        !            64: {
        !            65:        assert(p != vm_page_fictitious_addr);
        !            66:        bzero((char *)phystokv(p), PAGE_SIZE);
        !            67: }
        !            68: 
        !            69: /*
        !            70:  *     pmap_zero_part_page
        !            71:  *     zeros the specified (machine independent) part of a page.
        !            72:  */
        !            73: void
        !            74: pmap_zero_part_page(
        !            75:        vm_offset_t     p,
        !            76:        vm_offset_t     offset,
        !            77:        vm_size_t       len)
        !            78: {
        !            79:        assert(p != vm_page_fictitious_addr);
        !            80:        assert(offset + len <= PAGE_SIZE);
        !            81: 
        !            82:        bzero((char *)phystokv(p) + offset, len);
        !            83: }
        !            84: 
        !            85: /*
        !            86:  *     pmap_copy_page copies the specified (machine independent) pages.
        !            87:  */
        !            88: void
        !            89: pmap_copy_page(
        !            90:        vm_offset_t src,
        !            91:        vm_offset_t dst)
        !            92: {
        !            93:        assert(src != vm_page_fictitious_addr);
        !            94:        assert(dst != vm_page_fictitious_addr);
        !            95: 
        !            96:        memcpy((void *)phystokv(dst), (void *)phystokv(src), PAGE_SIZE);
        !            97: }
        !            98: 
        !            99: /*
        !           100:  *     pmap_copy_page copies the specified (machine independent) pages.
        !           101:  */
        !           102: void
        !           103: pmap_copy_part_page(
        !           104:        vm_offset_t     src,
        !           105:        vm_offset_t     src_offset,
        !           106:        vm_offset_t     dst,
        !           107:        vm_offset_t     dst_offset,
        !           108:        vm_size_t       len)
        !           109: {
        !           110:        assert(src != vm_page_fictitious_addr);
        !           111:        assert(dst != vm_page_fictitious_addr);
        !           112:        assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
        !           113:        assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
        !           114: 
        !           115:         memcpy((void *)(phystokv(dst) + dst_offset),
        !           116:               (void *)(phystokv(src) + src_offset), len);
        !           117: }
        !           118: 
        !           119: /*
        !           120:  *      pmap_copy_part_lpage copies part of a virtually addressed page 
        !           121:  *      to a physically addressed page.
        !           122:  */
        !           123: void
        !           124: pmap_copy_part_lpage(
        !           125:        vm_offset_t     src,
        !           126:        vm_offset_t     dst,
        !           127:        vm_offset_t     dst_offset,
        !           128:        vm_size_t       len)
        !           129: {
        !           130:        assert(src != vm_page_fictitious_addr);
        !           131:        assert(dst != vm_page_fictitious_addr);
        !           132:        assert(((dst & PAGE_MASK) + dst_offset + len) <= PAGE_SIZE);
        !           133: 
        !           134:         memcpy((void *)(phystokv(dst) + dst_offset), (void *)src, len);
        !           135: }
        !           136: 
        !           137: /*
        !           138:  *      pmap_copy_part_rpage copies part of a physically addressed page 
        !           139:  *      to a virtually addressed page.
        !           140:  */
        !           141: void
        !           142: pmap_copy_part_rpage(
        !           143:        vm_offset_t     src,
        !           144:        vm_offset_t     src_offset,
        !           145:        vm_offset_t     dst,
        !           146:        vm_size_t       len)
        !           147: {
        !           148:        assert(src != vm_page_fictitious_addr);
        !           149:        assert(dst != vm_page_fictitious_addr);
        !           150:        assert(((src & PAGE_MASK) + src_offset + len) <= PAGE_SIZE);
        !           151: 
        !           152:         memcpy((void *)dst, (void *)(phystokv(src) + src_offset), len);
        !           153: }
        !           154: 
        !           155: /*
        !           156:  *     kvtophys(addr)
        !           157:  *
        !           158:  *     Convert a kernel virtual address to a physical address
        !           159:  */
        !           160: vm_offset_t
        !           161: kvtophys(
        !           162:        vm_offset_t addr)
        !           163: {
        !           164:        pt_entry_t *pte;
        !           165: 
        !           166:        if ((pte = pmap_pte(kernel_pmap, addr)) == PT_ENTRY_NULL)
        !           167:                return 0;
        !           168:        return i386_trunc_page(*pte) | (addr & INTEL_OFFMASK);
        !           169: }

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