xnu-1228.3.13.tar.gz

[apple/xnu.git] / osfmk / ppc / cpu_capabilities.h

diff --git a/osfmk/ppc/cpu_capabilities.h b/osfmk/ppc/cpu_capabilities.h
index e11feacc01d531e4d3467ee3cf7d5d666495317b..268666cd25e6e3bd8662ed8633768f0efbf56bde 100644 (file)
--- a/osfmk/ppc/cpu_capabilities.h
+++ b/osfmk/ppc/cpu_capabilities.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2003-2006 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 
@@ -97,9 +97,51 @@ static __inline__ int _NumCPUs( void ) { return (_cpu_capabilities & kNumCPUs) >
 #define        _COMM_PAGE_AREA_LENGTH                  ( 7*4096)                                               // reserved length of entire comm area
 #define        _COMM_PAGE_AREA_USED                    ( 2*4096)                                               // we use two pages so far
 
+/* The following set of definitions are used in the kernel, which needs to distinguish between
+ * the 32 and 64-bit commpage addresses and lengths.  On PPC they are the same, but on Imtel
+ * they are not.
+ */
+#define _COMM_PAGE32_BASE_ADDRESS              ( _COMM_PAGE_BASE_ADDRESS )
+#define _COMM_PAGE64_BASE_ADDRESS              ( _COMM_PAGE_BASE_ADDRESS )
+#define        _COMM_PAGE32_AREA_LENGTH                ( _COMM_PAGE_AREA_LENGTH )
+#define        _COMM_PAGE64_AREA_LENGTH                ( _COMM_PAGE_AREA_LENGTH )
+#define        _COMM_PAGE32_AREA_USED                  ( _COMM_PAGE_AREA_USED )
+#define        _COMM_PAGE64_AREA_USED                  ( _COMM_PAGE_AREA_USED )
+
 /* The Objective-C runtime fixed address page to optimize message dispatch */
 #define _OBJC_PAGE_BASE_ADDRESS                        (-20*4096)                                              // start at page -20, ie 0xFFFEC000
  
+/*
+ * Objective-C needs an "absolute" area all the way up to the top of the
+ * address space.
+ * For a ppc32 task, that area gets allocated at runtime from user space.
+ * For a ppc64 task, that area is not within the user-accessible address range,
+ * so we pre-allocate it at exec time (see vm_map_exec()) along with the
+ * comm page.
+ * 
+ * NOTE: that means we can't "nest" the 64-bit comm page...
+ */
+#define _COMM_PAGE32_OBJC_SIZE 0ULL
+#define _COMM_PAGE32_OBJC_BASE 0ULL
+#if 0
+#define _COMM_PAGE64_OBJC_SIZE (4 * 4096)
+#define _COMM_PAGE64_OBJC_BASE (_OBJC_PAGE_BASE_ADDRESS)
+#else
+/*
+ * PPC51: ppc64 is limited to 51-bit addresses.
+ * PPC64 has a 51-bit address space limit, so we can't just go and
+ * map the Obj-C area up there.  We would have to create a nested pmap
+ * and make a special mapping that redirects the large virtual addresses to
+ * that other address space with lower addresses that fit within the 51-bit
+ * limit.
+ * VM would then have to handle this redirection when we fault one
+ * of these pages in but it doesn't do that at this point, so no
+ * Obj-C area for ppc64 for now :-(
+ */
+#define _COMM_PAGE64_OBJC_SIZE 0ULL
+#define _COMM_PAGE64_OBJC_BASE 0ULL
+#endif
+
 /* data in the comm page */
  
 #define _COMM_PAGE_SIGNATURE                   (_COMM_PAGE_BASE_ADDRESS+0x000) // first few bytes are a signature