[IA64] Rationalise Region Definitions

[pandora-kernel.git] / include / asm-ia64 / page.h

diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h
index 08894f7..ec17f9e 100644 (file)
--- a/include/asm-ia64/page.h
+++ b/include/asm-ia64/page.h
@@ -12,6 +12,19 @@
 #include <asm/intrinsics.h>
 #include <asm/types.h>
 
+/*
+ * The top three bits of an IA64 address are its Region Number.
+ * Different regions are assigned to different purposes.
+ */
+#define RGN_SHIFT      (61)
+#define RGN_BASE(r)  (__IA64_UL_CONST(r)<<RGN_SHIFT)
+
+#define KHIGH -1       /* high three bits of Kernel virtual address */
+#define RGN_KERNEL     7       /* Identity mapped region */
+#define RGN_UNCACHED    6      /* Identity mapped I/O region */
+#define RGN_GATE       5       /* Gate page, Kernel text, etc */
+#define RGN_HPAGE      4       /* For Huge TLB pages */
+
 /*
  * PAGE_SHIFT determines the actual kernel page size.
  */
@@ -36,10 +49,9 @@
 
 #define RGN_MAP_LIMIT  ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE)      /* per region addr limit */
 
+
 #ifdef CONFIG_HUGETLB_PAGE
-# define REGION_HPAGE          (4UL)   /* note: this is hardcoded in reload_context()!*/
-# define REGION_SHIFT          61
-# define HPAGE_REGION_BASE     (REGION_HPAGE << REGION_SHIFT)
+# define HPAGE_REGION_BASE     RGN_BASE(RGN_HPAGE)
 # define HPAGE_SHIFT           hpage_shift
 # define HPAGE_SHIFT_DEFAULT   28      /* check ia64 SDM for architecture supported size */
 # define HPAGE_SIZE            (__IA64_UL_CONST(1) << HPAGE_SHIFT)
@@ -130,16 +142,13 @@ typedef union ia64_va {
 #define REGION_NUMBER(x)       ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
 #define REGION_OFFSET(x)       ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
 
-#define REGION_SIZE            REGION_NUMBER(1)
-#define REGION_KERNEL          7
-
 #ifdef CONFIG_HUGETLB_PAGE
 # define htlbpage_to_page(x)   (((unsigned long) REGION_NUMBER(x) << 61)                       \
                                 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
 # define HUGETLB_PAGE_ORDER    (HPAGE_SHIFT - PAGE_SHIFT)
 # define is_hugepage_only_range(mm, addr, len)         \
-        (REGION_NUMBER(addr) == REGION_HPAGE &&        \
-         REGION_NUMBER((addr)+(len)-1) == REGION_HPAGE)
+        (REGION_NUMBER(addr) == RGN_HPAGE &&   \
+         REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
 extern unsigned int hpage_shift;
 #endif
 
@@ -197,7 +206,7 @@ get_order (unsigned long size)
 # define __pgprot(x)   (x)
 #endif /* !STRICT_MM_TYPECHECKS */
 
-#define PAGE_OFFSET                    __IA64_UL_CONST(0xe000000000000000)
+#define PAGE_OFFSET                    RGN_BASE(RGN_KERNEL)
 
 #define VM_DATA_DEFAULT_FLAGS          (VM_READ | VM_WRITE |                                   \
                                         VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |                \