root/arch/powerpc/include/asm/mman.h

INCLUDED FROM

DEFINITIONS

1. arch_calc_vm_prot_bits
2. arch_vm_get_page_prot
3. arch_validate_prot

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  */
   4 #ifndef _ASM_POWERPC_MMAN_H
   5 #define _ASM_POWERPC_MMAN_H
   6 
   7 #include <uapi/asm/mman.h>
   8 
   9 #ifdef CONFIG_PPC64
  10 
  11 #include <asm/cputable.h>
  12 #include <linux/mm.h>
  13 #include <linux/pkeys.h>
  14 #include <asm/cpu_has_feature.h>
  15 
  16 /*
  17  * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
  18  * here.  How important is the optimization?
  19  */
  20 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
  21                 unsigned long pkey)
  22 {
  23 #ifdef CONFIG_PPC_MEM_KEYS
  24         return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
  25 #else
  26         return ((prot & PROT_SAO) ? VM_SAO : 0);
  27 #endif
  28 }
  29 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
  30 
  31 static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
  32 {
  33 #ifdef CONFIG_PPC_MEM_KEYS
  34         return (vm_flags & VM_SAO) ?
  35                 __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
  36                 __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
  37 #else
  38         return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
  39 #endif
  40 }
  41 #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
  42 
  43 static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
  44 {
  45         if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
  46                 return false;
  47         if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
  48                 return false;
  49         return true;
  50 }
  51 #define arch_validate_prot arch_validate_prot
  52 
  53 #endif /* CONFIG_PPC64 */
  54 #endif  /* _ASM_POWERPC_MMAN_H */