| H. Peter Anvin | 5be8656 | 2007-07-11 12:18:41 -0700 | [diff] [blame] | 1 | /* ----------------------------------------------------------------------- * |
| 2 | * |
| 3 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 4 | * Copyright 2007 rPath, Inc. - All Rights Reserved |
| 5 | * |
| 6 | * This file is part of the Linux kernel, and is made available under |
| 7 | * the terms of the GNU General Public License version 2. |
| 8 | * |
| 9 | * ----------------------------------------------------------------------- */ |
| 10 | |
| 11 | /* |
| 12 | * arch/i386/boot/copy.S |
| 13 | * |
| 14 | * Memory copy routines |
| 15 | */ |
| 16 | |
| 17 | .code16gcc |
| 18 | .text |
| 19 | |
| 20 | .globl memcpy |
| 21 | .type memcpy, @function |
| 22 | memcpy: |
| 23 | pushw %si |
| 24 | pushw %di |
| 25 | movw %ax, %di |
| 26 | movw %dx, %si |
| 27 | pushw %cx |
| 28 | shrw $2, %cx |
| 29 | rep; movsl |
| 30 | popw %cx |
| 31 | andw $3, %cx |
| 32 | rep; movsb |
| 33 | popw %di |
| 34 | popw %si |
| 35 | ret |
| 36 | .size memcpy, .-memcpy |
| 37 | |
| 38 | .globl memset |
| 39 | .type memset, @function |
| 40 | memset: |
| 41 | pushw %di |
| 42 | movw %ax, %di |
| 43 | movzbl %dl, %eax |
| 44 | imull $0x01010101,%eax |
| 45 | pushw %cx |
| 46 | shrw $2, %cx |
| 47 | rep; stosl |
| 48 | popw %cx |
| 49 | andw $3, %cx |
| 50 | rep; stosb |
| 51 | popw %di |
| 52 | ret |
| 53 | .size memset, .-memset |
| 54 | |
| 55 | .globl copy_from_fs |
| 56 | .type copy_from_fs, @function |
| 57 | copy_from_fs: |
| 58 | pushw %ds |
| 59 | pushw %fs |
| 60 | popw %ds |
| 61 | call memcpy |
| 62 | popw %ds |
| 63 | ret |
| 64 | .size copy_from_fs, .-copy_from_fs |
| 65 | |
| 66 | .globl copy_to_fs |
| 67 | .type copy_to_fs, @function |
| 68 | copy_to_fs: |
| 69 | pushw %es |
| 70 | pushw %fs |
| 71 | popw %es |
| 72 | call memcpy |
| 73 | popw %es |
| 74 | ret |
| 75 | .size copy_to_fs, .-copy_to_fs |
| 76 | |
| 77 | #if 0 /* Not currently used, but can be enabled as needed */ |
| 78 | |
| 79 | .globl copy_from_gs |
| 80 | .type copy_from_gs, @function |
| 81 | copy_from_gs: |
| 82 | pushw %ds |
| 83 | pushw %gs |
| 84 | popw %ds |
| 85 | call memcpy |
| 86 | popw %ds |
| 87 | ret |
| 88 | .size copy_from_gs, .-copy_from_gs |
| 89 | .globl copy_to_gs |
| 90 | |
| 91 | .type copy_to_gs, @function |
| 92 | copy_to_gs: |
| 93 | pushw %es |
| 94 | pushw %gs |
| 95 | popw %es |
| 96 | call memcpy |
| 97 | popw %es |
| 98 | ret |
| 99 | .size copy_to_gs, .-copy_to_gs |
| 100 | |
| 101 | #endif |