88 lines
1.3 KiB
ArmAsm
88 lines
1.3 KiB
ArmAsm
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/* ----------------------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007 rPath, Inc. - All Rights Reserved
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*
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* This file is part of the Linux kernel, and is made available under
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* the terms of the GNU General Public License version 2.
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*
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* ----------------------------------------------------------------------- */
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#include <linux/linkage.h>
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/*
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* Memory copy routines
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*/
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.code16
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.text
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GLOBAL(memcpy)
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pushw %si
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pushw %di
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movw %ax, %di
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movw %dx, %si
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pushw %cx
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shrw $2, %cx
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rep; movsl
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popw %cx
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andw $3, %cx
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rep; movsb
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popw %di
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popw %si
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retl
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ENDPROC(memcpy)
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GLOBAL(memset)
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pushw %di
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movw %ax, %di
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movzbl %dl, %eax
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imull $0x01010101,%eax
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pushw %cx
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shrw $2, %cx
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rep; stosl
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popw %cx
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andw $3, %cx
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rep; stosb
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popw %di
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retl
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ENDPROC(memset)
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GLOBAL(copy_from_fs)
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pushw %ds
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pushw %fs
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popw %ds
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calll memcpy
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popw %ds
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retl
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ENDPROC(copy_from_fs)
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GLOBAL(copy_to_fs)
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pushw %es
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pushw %fs
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popw %es
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calll memcpy
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popw %es
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retl
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ENDPROC(copy_to_fs)
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#if 0 /* Not currently used, but can be enabled as needed */
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GLOBAL(copy_from_gs)
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pushw %ds
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pushw %gs
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popw %ds
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calll memcpy
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popw %ds
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retl
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ENDPROC(copy_from_gs)
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GLOBAL(copy_to_gs)
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pushw %es
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pushw %gs
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popw %es
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calll memcpy
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popw %es
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retl
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ENDPROC(copy_to_gs)
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#endif
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