x86: define PTE_MASK in a universally useful way

[deliverable/linux.git] / include / asm-x86 / page.h

diff --git a/include/asm-x86/page.h b/include/asm-x86/page.h
index a05b2896492f4c0feec091924d7b00a69128d81a..76b35e636d7d018f995f455de6922a6df2a294c9 100644 (file)
--- a/include/asm-x86/page.h
+++ b/include/asm-x86/page.h
@@ -10,8 +10,13 @@
 
 #ifdef __KERNEL__
 
-#define PHYSICAL_PAGE_MASK     (PAGE_MASK & __PHYSICAL_MASK)
-#define PTE_MASK               (_AT(long, PHYSICAL_PAGE_MASK))
+/* Cast PAGE_MASK to a signed type so that it is sign-extended if
+   virtual addresses are 32-bits but physical addresses are larger
+   (ie, 32-bit PAE). */
+#define PHYSICAL_PAGE_MASK     (((signed long)PAGE_MASK) & __PHYSICAL_MASK)
+
+/* PTE_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
+#define PTE_MASK               ((pteval_t)PHYSICAL_PAGE_MASK)
 
 #define PMD_PAGE_SIZE          (_AC(1, UL) << PMD_SHIFT)
 #define PMD_PAGE_MASK          (~(PMD_PAGE_SIZE-1))
@@ -24,8 +29,8 @@
 /* to align the pointer to the (next) page boundary */
 #define PAGE_ALIGN(addr)       (((addr)+PAGE_SIZE-1)&PAGE_MASK)
 
-#define __PHYSICAL_MASK                _AT(phys_addr_t, (_AC(1,ULL) << __PHYSICAL_MASK_SHIFT) - 1)
-#define __VIRTUAL_MASK         ((_AC(1,UL) << __VIRTUAL_MASK_SHIFT) - 1)
+#define __PHYSICAL_MASK                ((((phys_addr_t)1) << __PHYSICAL_MASK_SHIFT) - 1)
+#define __VIRTUAL_MASK         ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
 
 #ifndef __ASSEMBLY__
 #include <linux/types.h>
@@ -33,10 +38,8 @@
 
 #ifdef CONFIG_X86_64
 #include <asm/page_64.h>
-#define max_pfn_mapped         end_pfn_map
 #else
 #include <asm/page_32.h>
-#define max_pfn_mapped         max_low_pfn
 #endif /* CONFIG_X86_64 */
 
 #define PAGE_OFFSET            ((unsigned long)__PAGE_OFFSET)
@@ -49,6 +52,9 @@
 #ifndef __ASSEMBLY__
 
 extern int page_is_ram(unsigned long pagenr);
+extern int devmem_is_allowed(unsigned long pagenr);
+
+extern unsigned long max_pfn_mapped;
 
 struct page;