powerpc/mm: Add Strong Access Ordering support

[linux-2.6] / include / asm-powerpc / mman.h

diff --git a/include/asm-powerpc/mman.h b/include/asm-powerpc/mman.h
index 24cf664a829564ebeb9e8a6968a1ad5c2581265e..f8a32e20ba04ad02443ca320deb06580922b3a20 100644 (file)
--- a/include/asm-powerpc/mman.h
+++ b/include/asm-powerpc/mman.h
@@ -1,7 +1,9 @@
 #ifndef _ASM_POWERPC_MMAN_H
 #define _ASM_POWERPC_MMAN_H
 
+#include <asm/cputable.h>
 #include <asm-generic/mman.h>
+#include <linux/mm.h>
 
 /*
  * This program is free software; you can redistribute it and/or
@@ -10,6 +12,8 @@
  * 2 of the License, or (at your option) any later version.
  */
 
+#define PROT_SAO       0x10            /* Strong Access Ordering */
+
 #define MAP_RENAME      MAP_ANONYMOUS   /* In SunOS terminology */
 #define MAP_NORESERVE   0x40            /* don't reserve swap pages */
 #define MAP_LOCKED     0x80
@@ -24,4 +28,32 @@
 #define MAP_POPULATE   0x8000          /* populate (prefault) pagetables */
 #define MAP_NONBLOCK   0x10000         /* do not block on IO */
 
+#ifdef CONFIG_PPC64
+/*
+ * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
+ * here.  How important is the optimization?
+ */
+static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot)
+{
+       return (prot & PROT_SAO) ? VM_SAO : 0;
+}
+#define arch_calc_vm_prot_bits(prot) arch_calc_vm_prot_bits(prot)
+
+static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
+{
+       return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : 0;
+}
+#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
+
+static inline int arch_validate_prot(unsigned long prot)
+{
+       if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
+               return 0;
+       if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
+               return 0;
+       return 1;
+}
+#define arch_validate_prot(prot) arch_validate_prot(prot)
+
+#endif /* CONFIG_PPC64 */
 #endif /* _ASM_POWERPC_MMAN_H */