xnu-1699.22.73.tar.gz

[apple/xnu.git] / osfmk / mach / vm_param.h

diff --git a/osfmk/mach/vm_param.h b/osfmk/mach/vm_param.h
index 1bd57e3326b6da71f67fc18433ec91f66c268c51..468920caaaef13bbd2c7cfa825fceb3adb81184f 100644 (file)
--- a/osfmk/mach/vm_param.h
+++ b/osfmk/mach/vm_param.h
@@ -1,14 +1,19 @@
 /*
 /*

- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * 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
  * 
  * 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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.
+ * 
+ * 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
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER


@@ -18,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /*
  * @OSF_COPYRIGHT@
  */
 /*
  * @OSF_COPYRIGHT@


@@ -91,6 +96,9 @@
 #define atop_64(x) ((uint64_t)(x) >> PAGE_SHIFT)
 #define ptoa_64(x) ((uint64_t)(x) << PAGE_SHIFT)
 
 #define atop_64(x) ((uint64_t)(x) >> PAGE_SHIFT)
 #define ptoa_64(x) ((uint64_t)(x) << PAGE_SHIFT)
 

+#define atop_kernel(x) ((vm_address_t)(x) >> PAGE_SHIFT)
+#define ptoa_kernel(x) ((vm_address_t)(x) << PAGE_SHIFT)
+

 /*
  *      While the following block is enabled, the legacy atop and ptoa
  *      macros will behave correctly.  If not, they will generate
 /*
  *      While the following block is enabled, the legacy atop and ptoa
  *      macros will behave correctly.  If not, they will generate


@@ -119,8 +127,8 @@
  *     address space size) VM types.
  */
 
  *     address space size) VM types.
  */
 

-#define round_page(x) (((vm_offset_t)(x) + PAGE_MASK) & ~((signed)PAGE_MASK))
-#define trunc_page(x) ((vm_offset_t)(x) & ~((signed)PAGE_MASK))
+#define round_page(x) (((vm_offset_t)(x) + PAGE_MASK) & ~((vm_offset_t)PAGE_MASK))
+#define trunc_page(x) ((vm_offset_t)(x) & ~((vm_offset_t)PAGE_MASK))

 
 /*
  *     Round off or truncate to the nearest page.  These will work
 
 /*
  *     Round off or truncate to the nearest page.  These will work


@@ -134,11 +142,10 @@
  *     associated with the specific VM type should be used.
  */
 
  *     associated with the specific VM type should be used.
  */
 

-#define round_page_32(x) (((uint32_t)(x) + PAGE_MASK) & ~((signed)PAGE_MASK))
-#define trunc_page_32(x) ((uint32_t)(x) & ~((signed)PAGE_MASK))
-#define round_page_64(x) (((uint64_t)(x) + PAGE_MASK) & ~((signed)PAGE_MASK))
-#define trunc_page_64(x) ((uint64_t)(x) & ~((signed)PAGE_MASK))
-
+#define round_page_32(x) (((uint32_t)(x) + PAGE_MASK) & ~((uint32_t)PAGE_MASK))
+#define trunc_page_32(x) ((uint32_t)(x) & ~((uint32_t)PAGE_MASK))
+#define round_page_64(x) (((uint64_t)(x) + PAGE_MASK_64) & ~((uint64_t)PAGE_MASK_64))
+#define trunc_page_64(x) ((uint64_t)(x) & ~((uint64_t)PAGE_MASK_64))

 
 /*
  *      Enable the following block to find uses of xxx_32 macros that should
 
 /*
  *      Enable the following block to find uses of xxx_32 macros that should


@@ -204,17 +211,35 @@
  *     an exact page multiple.
  */
 
  *     an exact page multiple.
  */
 

-#define        page_aligned(x) ((((vm_object_offset_t) (x)) & PAGE_MASK) == 0)
+#define        page_aligned(x) (((x) & PAGE_MASK) == 0)

 
 extern vm_size_t       mem_size;               /* 32-bit size of memory - limited by maxmem - deprecated */
 extern uint64_t                max_mem;                /* 64-bit size of memory - limited by maxmem */
 
 
 extern vm_size_t       mem_size;               /* 32-bit size of memory - limited by maxmem - deprecated */
 extern uint64_t                max_mem;                /* 64-bit size of memory - limited by maxmem */
 

+/*
+ * The default pager does not handle 64-bit offsets inside its objects,
+ * so this limits the size of anonymous memory objects to 4GB minus 1 page.
+ * When we need to allocate a chunk of anonymous memory over that size,
+ * we have to allocate more than one chunk.
+ */
+#define ANON_MAX_SIZE  0xFFFFF000ULL
+/*
+ * Work-around for <rdar://problem/6626493>
+ * Break large anonymous memory areas into 128MB chunks to alleviate
+ * the cost of copying when copy-on-write is not possible because a small
+ * portion of it being wired.
+ */
+#define ANON_CHUNK_SIZE        (128ULL * 1024 * 1024) /* 128MB */
+

 #ifdef XNU_KERNEL_PRIVATE
 
 extern uint64_t                mem_actual;             /* 64-bit size of memory - not limited by maxmem */
 extern uint64_t                sane_size;              /* Memory size to use for defaults calculations */
 extern addr64_t        vm_last_addr;   /* Highest kernel virtual address known to the VM system */
 
 #ifdef XNU_KERNEL_PRIVATE
 
 extern uint64_t                mem_actual;             /* 64-bit size of memory - not limited by maxmem */
 extern uint64_t                sane_size;              /* Memory size to use for defaults calculations */
 extern addr64_t        vm_last_addr;   /* Highest kernel virtual address known to the VM system */
 

+extern const vm_offset_t       vm_min_kernel_address;
+extern const vm_offset_t       vm_max_kernel_address;
+

 #endif /* XNU_KERNEL_PRIVATE */
 
 extern vm_size_t       page_size;
 #endif /* XNU_KERNEL_PRIVATE */
 
 extern vm_size_t       page_size;


@@ -222,16 +247,19 @@ extern vm_size_t  page_mask;
 extern int                     page_shift;
 
 /* We need a way to get rid of compiler warnings when we cast from   */
 extern int                     page_shift;
 
 /* We need a way to get rid of compiler warnings when we cast from   */

-/* a 64 bit value to an address that is 32 bits.                     */
-/* We know at this point the cast is harmless but sometime in        */
-/* the future it may not be.                                         */
-/* When size of an int is no longer equal to size of uintptr_t then  */
-/* the compile will fail and we know we need to fix our cast.           */
+/* a 64 bit value to an address (which may be 32 bits or 64-bits).   */
+/* An intptr_t is used convert the value to the right precision, and */
+/* then to an address. This macro is also used to convert addresses  */
+/* to 32-bit integers, which is a hard failure for a 64-bit kernel   */

 #include <stdint.h>
 #ifndef __CAST_DOWN_CHECK
 #define __CAST_DOWN_CHECK
 #include <stdint.h>
 #ifndef __CAST_DOWN_CHECK
 #define __CAST_DOWN_CHECK

-typedef char __NEED_TO_CHANGE_CAST_DOWN[ sizeof(uintptr_t) == sizeof(int) ? 0 : -1 ];
-#define CAST_DOWN( type, addr )  ( ((type)((uintptr_t) (addr))) ) 
+
+#define CAST_DOWN( type, addr ) \
+    ( ((type)((uintptr_t) (addr)/(sizeof(type) < sizeof(uintptr_t) ? 0 : 1))) )
+
+#define CAST_DOWN_EXPLICIT( type, addr )  ( ((type)((uintptr_t) (addr))) ) 
+

 #endif /* __CAST_DOWN_CHECK */
 
 #endif /* ASSEMBLER */
 #endif /* __CAST_DOWN_CHECK */
 
 #endif /* ASSEMBLER */