arch/powerpc/include/asm/mman.h

   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 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
  17                 unsigned long pkey)
  18 {
  19 #ifdef CONFIG_PPC_MEM_KEYS
  20         return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
  21 #else
  22         return ((prot & PROT_SAO) ? VM_SAO : 0);
  23 #endif
  24 }
  25 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
  26
  27 static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
  28 {
  29 #ifdef CONFIG_PPC_MEM_KEYS
  30         return (vm_flags & VM_SAO) ?
  31                 __pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
  32                 __pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
  33 #else
  34         return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
  35 #endif
  36 }
  37 #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
  38
  39 static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
  40 {
  41         if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
  42                 return false;
  43         if (prot & PROT_SAO) {
  44                 if (!cpu_has_feature(CPU_FTR_SAO))
  45                         return false;
  46                 if (firmware_has_feature(FW_FEATURE_LPAR) &&
  47                     !IS_ENABLED(CONFIG_PPC_PROT_SAO_LPAR))
  48                         return false;
  49         }
  50         return true;
  51 }
  52 #define arch_validate_prot arch_validate_prot
  53
  54 #endif /* CONFIG_PPC64 */
  55 #endif  /* _ASM_POWERPC_MMAN_H */