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 <bde@zeta.org.au>

1 files changed, 58 insertions, 0 deletions

diff --git a/sys/i386/include/atomic.h b/sys/i386/include/atomic.h
new file mode 100644
index 0000000..aae3484
--- /dev/null
+++ b/sys/i386/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_ */