| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [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 | #include <linux/linkage.h> |
| 12 | |
| 13 | /* |
| 14 | * Memory copy routines |
| 15 | */ |
| 16 | |
| 17 | .code16 |
| 18 | .text |
| 19 | |
| 20 | GLOBAL(memcpy) |
| 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 |
| 33 | retl |
| 34 | ENDPROC(memcpy) |
| 35 | |
| 36 | GLOBAL(memset) |
| 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 |
| 48 | retl |
| 49 | ENDPROC(memset) |
| 50 | |
| 51 | GLOBAL(copy_from_fs) |
| 52 | pushw %ds |
| 53 | pushw %fs |
| 54 | popw %ds |
| 55 | calll memcpy |
| 56 | popw %ds |
| 57 | retl |
| 58 | ENDPROC(copy_from_fs) |
| 59 | |
| 60 | GLOBAL(copy_to_fs) |
| 61 | pushw %es |
| 62 | pushw %fs |
| 63 | popw %es |
| 64 | calll memcpy |
| 65 | popw %es |
| 66 | retl |
| 67 | ENDPROC(copy_to_fs) |
| 68 | |
| 69 | #if 0 /* Not currently used, but can be enabled as needed */ |
| 70 | GLOBAL(copy_from_gs) |
| 71 | pushw %ds |
| 72 | pushw %gs |
| 73 | popw %ds |
| 74 | calll memcpy |
| 75 | popw %ds |
| 76 | retl |
| 77 | ENDPROC(copy_from_gs) |
| 78 | |
| 79 | GLOBAL(copy_to_gs) |
| 80 | pushw %es |
| 81 | pushw %gs |
| 82 | popw %es |
| 83 | calll memcpy |
| 84 | popw %es |
| 85 | retl |
| 86 | ENDPROC(copy_to_gs) |
| 87 | #endif |