arch/powerpc/include/asm/mman.h

   1 /*
   2  * This program is free software; you can redistribute it and/or
   3  * modify it under the terms of the GNU General Public License
   4  * as published by the Free Software Foundation; either version
   5  * 2 of the License, or (at your option) any later version.
   6  */
   7 #ifndef _ASM_POWERPC_MMAN_H
   8 #define _ASM_POWERPC_MMAN_H
   9
  10 #include <uapi/asm/mman.h>
  11
  12 #ifdef CONFIG_PPC64
  13
  14 #include <asm/cputable.h>
  15 #include <linux/mm.h>
  16 #include <linux/pkeys.h>
  17 #include <asm/cpu_has_feature.h>
  18
  19 /*
  20  * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
  21  * here.  How important is the optimization?
  22  */
  23 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
  24                 unsigned long pkey)
  25 {
  26 #ifdef CONFIG_PPC_MEM_KEYS
  27         return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
  28 #else
  29         return ((prot & PROT_SAO) ? VM_SAO : 0);
  30 #endif
  31 }
  32 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
  33
  34 static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
  35 {
  36 #ifdef CONFIG_PPC_MEM_KEYS
  37         return (vm_flags & VM_SAO) ?
  38                 __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
  39                 __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
  40 #else
  41         return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
  42 #endif
  43 }
  44 #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
  45
  46 static inline bool arch_validate_prot(unsigned long prot)
  47 {
  48         if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
  49                 return false;
  50         if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
  51                 return false;
  52         return true;
  53 }
  54 #define arch_validate_prot(prot) arch_validate_prot(prot)
  55
  56 #endif /* CONFIG_PPC64 */
  57 #endif  /* _ASM_POWERPC_MMAN_H */