asm-generic: Introduce page.h

At the moment we are using 4K pages all the time,
so instead of copying code over all archs we're
supporting -- add asm-generic/page.h header.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/arm/include/asm/types.h

@@ -6,6 +6,7 @@
 #include <signal.h>
 #include "protobuf/core.pb-c.h"
 
+#include "asm-generic/page.h"
 #include "asm/bitops.h"
 #include "asm/int.h"
 
@@ -92,14 +93,6 @@ struct user_vfp_exc {
 #define ASSIGN_TYPED(a, b) do { a = (typeof(a))b; } while (0)
 #define ASSIGN_MEMBER(a,b,m) do { ASSIGN_TYPED((a)->m, (b)->m); } while (0)
 
-#ifndef PAGE_SIZE
-# define PAGE_SIZE	4096
-#endif
-
-#ifndef PAGE_MASK
-# define PAGE_MASK	(~(PAGE_SIZE - 1))
-#endif
-
 #define REG_RES(regs) ((regs).ARM_r0)
 #define REG_IP(regs)  ((regs).ARM_pc)
 #define REG_SYSCALL_NR(regs) ((regs).ARM_r7)

arch/x86/include/asm/types.h

@@ -4,6 +4,7 @@
 #include <stdbool.h>
 #include <signal.h>
 
+#include "asm-generic/page.h"
 #include "asm/bitops.h"
 #include "asm/int.h"
 #include "asm/prlimit.h"
@@ -108,14 +109,6 @@ typedef struct {
 #define ASSIGN_TYPED(a, b) do { a = (typeof(a))b; } while (0)
 #define ASSIGN_MEMBER(a,b,m) do { ASSIGN_TYPED((a)->m, (b)->m); } while (0)
 
-#ifndef PAGE_SIZE
-# define PAGE_SIZE	4096
-#endif
-
-#ifndef PAGE_MASK
-# define PAGE_MASK	(~(PAGE_SIZE - 1))
-#endif
-
 #define TASK_SIZE ((1UL << 47) - PAGE_SIZE)
 
 typedef u64 auxv_t;

include/asm-generic/page.h

+#ifndef __CR_ASM_GENERIC_PAGE_H__
+#define __CR_ASM_GENERIC_PAGE_H__
+
+#ifndef PAGE_SHIFT
+# define PAGE_SHIFT	12
+#endif
+
+#ifndef PAGE_SIZE
+# define PAGE_SIZE	(1UL << PAGE_SHIFT)
+#endif
+
+#ifndef PAGE_MASK
+# define PAGE_MASK	(~(PAGE_SIZE - 1))
+#endif
+
+#define PAGE_PFN(addr)	((addr) / PAGE_SIZE)
+
+#endif /* __CR_ASM_GENERIC_PAGE_H__ */