xnu-792.tar.gz

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

diff --git a/bsd/sys/param.h b/bsd/sys/param.h
index 61d1806c3e97aad35fbdb6440984cc0374556ad3..f9b6aafc205acf23eec9de8b85183f5bcce1b07a 100644 (file)
--- a/bsd/sys/param.h
+++ b/bsd/sys/param.h
@@ -70,9 +70,11 @@
 #define NeXTBSD        1995064         /* NeXTBSD version (year, month, release) */
 #define NeXTBSD4_0 0           /* NeXTBSD 4.0 */
 
+#include <sys/_types.h>
+
 #ifndef NULL
-#define        NULL    0
-#endif
+#define        NULL    __DARWIN_NULL
+#endif /* ! NULL */
 
 #ifndef LOCORE
 #include <sys/types.h>
@@ -137,6 +139,7 @@
 #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 PDROP  0x400           /* OR'd with pri to stop re-entry of interlock mutex */
 
 #define        NZERO   0               /* default "nice" */
 
@@ -175,16 +178,20 @@
 /*
  * 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*PAGE_SIZE) 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