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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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