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Annotation of kernel/machdep/i386/libc/pagesize.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
        !            26:  *
        !            27:  *      File:   machdep/i386/libc/pagesize.c
        !            28:  *      Author: Bruce Martin, NeXT Computer, Inc.
        !            29:  *
        !            30:  *      This file contains machine dependent code for block compares
        !            31:  *      on NeXT i386-based products.  Currently tuned for the i486.
        !            32:  *
        !            33:  * HISTORY
        !            34:  * 27-Sep-92  Bruce Martin ([email protected])
        !            35:  *     Created.
        !            36:  */
        !            37: 
        !            38: #include <mach/mach_types.h>
        !            39: 
        !            40: #if defined(NX_CURRENT_COMPILER_RELEASE) && (NX_CURRENT_COMPILER_RELEASE < 320)
        !            41: #define SIREG "e"
        !            42: #else
        !            43: #define SIREG "S"
        !            44: #endif
        !            45: 
        !            46: /*
        !            47:  * A memory set function which requires its input address to be
        !            48:  * integer aligned, and its span to be an integer mulitple of
        !            49:  * 32 bytes.
        !            50:  *
        !            51:  * NOTE: we force this routine to use %ecx because
        !            52:  * we have to note that these arguments are clobbered.  There
        !            53:  * doesn't seem to be any other way - short of hard-wiring
        !            54:  * a specific register.
        !            55:  */
        !            56: static __inline__ vm_offset_t
        !            57: mem_set_a4_l32(vm_offset_t addr, unsigned int val, int len)
        !            58: {
        !            59:     asm volatile ("
        !            60:        .align 2, 0x90
        !            61:        movl %2, 0x00(%0);      movl %2, 0x04(%0)
        !            62:        movl %2, 0x08(%0);      movl %2, 0x0C(%0)
        !            63:        movl %2, 0x10(%0);      movl %2, 0x14(%0)
        !            64:        movl %2, 0x18(%0);      movl %2, 0x1C(%0)
        !            65:        addl $0x20, %0;         addl $-0x20,%1
        !            66:        jne .-30
        !            67:        "
        !            68:        : "=r" (addr)
        !            69:        : "c" (len), "a" (val), "0" (addr)
        !            70:        : "eax", "ecx", "cc");
        !            71:     return(addr);
        !            72: }
        !            73: 
        !            74: 
        !            75: /*
        !            76:  * A memory copy which requires its input addresses to be
        !            77:  * integer aligned, and its span to be an integer multiple of
        !            78:  * four bytes.
        !            79:  *
        !            80:  * Benchmarking has shown the use of the rep;movsl opcode to be
        !            81:  * slightly slower than the optimal unrolled loop on the 486, but
        !            82:  * only by a few percent.  On the P5, you can't beat rep;movsl.
        !            83:  */
        !            84: static __inline__ void
        !            85: mem_copy_forward_a4_l4(vm_offset_t dst, vm_offset_t src, vm_size_t len)
        !            86: {
        !            87:     asm("rep; movsl"
        !            88:         : /* no outputs */
        !            89:         : "c" (len>>2), "D" (dst), SIREG (src)
        !            90:         : "ecx", "esi", "edi");
        !            91:     return;
        !            92: }
        !            93: 
        !            94: 
        !            95: 
        !            96: void
        !            97: page_set(vm_offset_t addr, int val, vm_size_t size)
        !            98: {
        !            99:     (void) mem_set_a4_l32(addr, val, size);
        !           100:     return;
        !           101: }
        !           102: 
        !           103: 
        !           104: void
        !           105: page_copy(vm_offset_t dst, vm_offset_t src, vm_size_t size)
        !           106: {
        !           107:     (void) mem_copy_forward_a4_l4(dst, src, size);
        !           108:     return;
        !           109: }
        !           110: 
        !           111: 

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