projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 5be86566 PA |
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 | ||
| 2f795550 CG |
11 | #include <linux/linkage.h> |
| 12 | ||
| 5be86566 | 13 | /* |
| 5be86566 PA |
14 | * Memory copy routines |
| 15 | */ | |
| 16 | ||
| e24df921 | 17 | .code16 |
| 5be86566 PA |
18 | .text |
| 19 | ||
| 2f795550 | 20 | GLOBAL(memcpy) |
| 5be86566 PA |
21 | pushw %si |
| 22 | pushw %di | |
| 23 | movw %ax, %di | |
| 24 | movw %dx, %si | |
| 25 | pushw %cx | |
| 26 | shrw $2, %cx | |
| 27 | rep; movsl | |
| 28 | popw %cx | |
| 29 | andw $3, %cx | |
| 30 | rep; movsb | |
| 31 | popw %di | |
| 32 | popw %si | |
| e24df921 | 33 | retl |
| 2f795550 | 34 | ENDPROC(memcpy) |
| 5be86566 | 35 | |
| 2f795550 | 36 | GLOBAL(memset) |
| 5be86566 PA |
37 | pushw %di |
| 38 | movw %ax, %di | |
| 39 | movzbl %dl, %eax | |
| 40 | imull $0x01010101,%eax | |
| 41 | pushw %cx | |
| 42 | shrw $2, %cx | |
| 43 | rep; stosl | |
| 44 | popw %cx | |
| 45 | andw $3, %cx | |
| 46 | rep; stosb | |
| 47 | popw %di | |
| e24df921 | 48 | retl |
| 2f795550 | 49 | ENDPROC(memset) |
| 5be86566 | 50 | |
| 2f795550 | 51 | GLOBAL(copy_from_fs) |
| 5be86566 PA |
52 | pushw %ds |
| 53 | pushw %fs | |
| 54 | popw %ds | |
| e24df921 | 55 | calll memcpy |
| 5be86566 | 56 | popw %ds |
| e24df921 | 57 | retl |
| 2f795550 | 58 | ENDPROC(copy_from_fs) |
| 5be86566 | 59 | |
| 2f795550 | 60 | GLOBAL(copy_to_fs) |
| 5be86566 PA |
61 | pushw %es |
| 62 | pushw %fs | |
| 63 | popw %es | |
| e24df921 | 64 | calll memcpy |
| 5be86566 | 65 | popw %es |
| e24df921 | 66 | retl |
| 2f795550 | 67 | ENDPROC(copy_to_fs) |
| 5be86566 PA |
68 | |
| 69 | #if 0 /* Not currently used, but can be enabled as needed */ | |
| 2f795550 | 70 | GLOBAL(copy_from_gs) |
| 5be86566 PA |
71 | pushw %ds |
| 72 | pushw %gs | |
| 73 | popw %ds | |
| e24df921 | 74 | calll memcpy |
| 5be86566 | 75 | popw %ds |
| e24df921 | 76 | retl |
| 2f795550 | 77 | ENDPROC(copy_from_gs) |
| 5be86566 | 78 | |
| 2f795550 | 79 | GLOBAL(copy_to_gs) |
| 5be86566 PA |
80 | pushw %es |
| 81 | pushw %gs | |
| 82 | popw %es | |
| e24df921 | 83 | calll memcpy |
| 5be86566 | 84 | popw %es |
| e24df921 | 85 | retl |
| 2f795550 | 86 | ENDPROC(copy_to_gs) |
| 5be86566 | 87 | #endif |