xnu-4903.221.2.tar.gz

[apple/xnu.git] / bsd / sys / param.h

diff --git a/bsd/sys/param.h b/bsd/sys/param.h
index f8ee80b4611dd77445d3e76532b3c8a017ca675c..012e7563095c58324ad5d19b158fb4e5e0352878 100644 (file)
--- a/bsd/sys/param.h
+++ b/bsd/sys/param.h
@@ -1,23 +1,29 @@
 /*
  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
  *
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
 /*-
@@ -70,9 +76,8 @@
 #define NeXTBSD        1995064         /* NeXTBSD version (year, month, release) */
 #define NeXTBSD4_0 0           /* NeXTBSD 4.0 */
 
-#ifndef NULL
-#define        NULL    0
-#endif
+#include <sys/_types.h>
+#include <sys/_types/_null.h>
 
 #ifndef LOCORE
 #include <sys/types.h>
@@ -100,16 +105,18 @@
 
 /* Machine type dependent parameters. */
 #include <machine/param.h>
-#include <machine/limits.h>
 
 /* More types and definitions used throughout the kernel. */
 #ifdef KERNEL
+#include <machine/limits.h>
 #include <sys/cdefs.h>
 #include <sys/errno.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/ucred.h>
 #include <sys/uio.h>
+#else
+#include <limits.h>
 #endif
 
 /* Signals. */
@@ -135,8 +142,8 @@
 #define        PRIMASK 0x0ff
 #define        PCATCH  0x100           /* OR'd with pri for tsleep to check signals */
 #define PTTYBLOCK 0x200                /* for tty SIGTTOU and SIGTTIN blocking */
-
-#define        NZERO   0               /* default "nice" */
+#define PDROP  0x400           /* OR'd with pri to stop re-aquistion of mutex upon wakeup */
+#define PSPIN  0x800           /* OR'd with pri to require mutex in spin mode upon wakeup */
 
 #define        NBPW    sizeof(int)     /* number of bytes per word (integer) */
 
@@ -173,16 +180,20 @@
 /*
  * File system parameters and macros.
  *
- * The file system is made out of blocks of at most MAXBSIZE units, with
+ * The file system is made out of blocks of at most MAXPHYS units, with
  * smaller units (fragments) only in the last direct block.  MAXBSIZE
  * primarily determines the size of buffers in the buffer pool.  It may be
- * made larger without any effect on existing file systems; however making
- * it smaller make make some file systems unmountable.
+ * made larger than MAXPHYS without any effect on existing file systems;
+ * however making it smaller may make some file systems unmountable.
+ * We set this to track the value of MAX_UPL_TRANSFER_BYTES from
+ * osfmk/mach/memory_object_types.h to bound it at the maximum UPL size.
  */
-#define        MAXBSIZE        MAXPHYS
+#define        MAXBSIZE        (256 * 4096)
 #define MAXPHYSIO      MAXPHYS
 #define MAXFRAG        8
 
+#define        MAXPHYSIO_WIRED (16 * 1024 * 1024)
+
 /*
  * MAXPATHLEN defines the longest permissable path length after expanding
  * symbolic links. It is used to allocate a temporary buffer from the buffer
@@ -203,9 +214,10 @@
 
 /* Macros for counting and rounding. */
 #ifndef howmany
-#define        howmany(x, y)   (((x)+((y)-1))/(y))
+#define        howmany(x, y)   ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1))
 #endif
-#define        roundup(x, y)   ((((x)+((y)-1))/(y))*(y))
+#define        roundup(x, y)   ((((x) % (y)) == 0) ? \
+                       (x) : ((x) + ((y) - ((x) % (y)))))
 #define powerof2(x)    ((((x)-1)&(x))==0)
 
 /* Macros for min/max. */