From 069e9bc1b4e6189140c16ee2d7277dc0301b3f71 Mon Sep 17 00:00:00 2001 From: Doug Rabson Date: Mon, 24 Aug 1998 08:39:39 +0000 Subject: Change various syscalls to use size_t arguments instead of u_int. Add some overflow checks to read/write (from bde). Change all modifications to vm_page::flags, vm_page::busy, vm_object::flags and vm_object::paging_in_progress to use operations which are not interruptable. Reviewed by: Bruce Evans --- sys/amd64/include/atomic.h | 58 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 sys/amd64/include/atomic.h (limited to 'sys/amd64/include') diff --git a/sys/amd64/include/atomic.h b/sys/amd64/include/atomic.h new file mode 100644 index 000000000000..aae34844a8b2 --- /dev/null +++ b/sys/amd64/include/atomic.h @@ -0,0 +1,58 @@ +/*- + * Copyright (c) 1998 Doug Rabson + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $Id$ + */ +#ifndef _MACHINE_ATOMIC_H_ +#define _MACHINE_ATOMIC_H_ + +/* + * Various simple arithmetic on memory which is atomic in the presence + * of interrupts. + * + * Note: these versions are not SMP safe. + */ + +#define atomic_set_char(P, V) (*(u_char*)(P) |= (V)) +#define atomic_clear_char(P, V) (*(u_char*)(P) &= ~(V)) +#define atomic_add_char(P, V) (*(u_char*)(P) += (V)) +#define atomic_subtract_char(P, V) (*(u_char*)(P) -= (V)) + +#define atomic_set_short(P, V) (*(u_short*)(P) |= (V)) +#define atomic_clear_short(P, V) (*(u_short*)(P) &= ~(V)) +#define atomic_add_short(P, V) (*(u_short*)(P) += (V)) +#define atomic_subtract_short(P, V) (*(u_short*)(P) -= (V)) + +#define atomic_set_int(P, V) (*(u_int*)(P) |= (V)) +#define atomic_clear_int(P, V) (*(u_int*)(P) &= ~(V)) +#define atomic_add_int(P, V) (*(u_int*)(P) += (V)) +#define atomic_subtract_int(P, V) (*(u_int*)(P) -= (V)) + +#define atomic_set_long(P, V) (*(u_long*)(P) |= (V)) +#define atomic_clear_long(P, V) (*(u_long*)(P) &= ~(V)) +#define atomic_add_long(P, V) (*(u_long*)(P) += (V)) +#define atomic_subtract_long(P, V) (*(u_long*)(P) -= (V)) + +#endif /* ! _MACHINE_ATOMIC_H_ */ -- cgit v1.3