| /* ----------------------------------------------------------------------- * |
| * |
| * Copyright (C) 1991, 1992 Linus Torvalds |
| * Copyright 2007 rPath, Inc. - All Rights Reserved |
| * |
| * This file is part of the Linux kernel, and is made available under |
| * the terms of the GNU General Public License version 2. |
| * |
| * ----------------------------------------------------------------------- */ |
| |
| #include <linux/linkage.h> |
| |
| /* |
| * Memory copy routines |
| */ |
| |
| .code16gcc |
| .text |
| |
| GLOBAL(memcpy) |
| pushw %si |
| pushw %di |
| movw %ax, %di |
| movw %dx, %si |
| pushw %cx |
| shrw $2, %cx |
| rep; movsl |
| popw %cx |
| andw $3, %cx |
| rep; movsb |
| popw %di |
| popw %si |
| ret |
| ENDPROC(memcpy) |
| |
| GLOBAL(memset) |
| pushw %di |
| movw %ax, %di |
| movzbl %dl, %eax |
| imull $0x01010101,%eax |
| pushw %cx |
| shrw $2, %cx |
| rep; stosl |
| popw %cx |
| andw $3, %cx |
| rep; stosb |
| popw %di |
| ret |
| ENDPROC(memset) |
| |
| GLOBAL(copy_from_fs) |
| pushw %ds |
| pushw %fs |
| popw %ds |
| call memcpy |
| popw %ds |
| ret |
| ENDPROC(copy_from_fs) |
| |
| GLOBAL(copy_to_fs) |
| pushw %es |
| pushw %fs |
| popw %es |
| call memcpy |
| popw %es |
| ret |
| ENDPROC(copy_to_fs) |
| |
| #if 0 /* Not currently used, but can be enabled as needed */ |
| GLOBAL(copy_from_gs) |
| pushw %ds |
| pushw %gs |
| popw %ds |
| call memcpy |
| popw %ds |
| ret |
| ENDPROC(copy_from_gs) |
| |
| GLOBAL(copy_to_gs) |
| pushw %es |
| pushw %gs |
| popw %es |
| call memcpy |
| popw %es |
| ret |
| ENDPROC(copy_to_gs) |
| #endif |