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/* Macros for copying by pages; used in memcpy, memmove. Mach version.
Copyright (C) 1995-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <mach.h>
/* Threshold at which vm_copy is more efficient than well-optimized copying
by words. This parameter should be tuned as necessary. */
#define PAGE_THRESHOLD (2 * PAGE_SIZE) /* XXX ? */
#define PAGE_SIZE __vm_page_size
#define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes) \
((nbytes_left) = ((nbytes) - \
(__vm_copy (__mach_task_self (), \
(vm_address_t) srcp, trunc_page (nbytes), \
(vm_address_t) dstp) == KERN_SUCCESS \
? trunc_page (nbytes) \
: 0)))
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