arch/x86/include/asm/pkeys.h

   1 #ifndef _ASM_X86_PKEYS_H
   2 #define _ASM_X86_PKEYS_H
   3
   4 #define PKEY_DEDICATED_EXECUTE_ONLY 15
   5 /*
   6  * Consider the PKEY_DEDICATED_EXECUTE_ONLY key unavailable.
   7  */
   8 #define arch_max_pkey() (boot_cpu_has(X86_FEATURE_OSPKE) ? \
   9                 PKEY_DEDICATED_EXECUTE_ONLY : 1)
  10
  11 extern int arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
  12                 unsigned long init_val);
  13
  14 /*
  15  * Try to dedicate one of the protection keys to be used as an
  16  * execute-only protection key.
  17  */
  18 extern int __execute_only_pkey(struct mm_struct *mm);
  19 static inline int execute_only_pkey(struct mm_struct *mm)
  20 {
  21         if (!boot_cpu_has(X86_FEATURE_OSPKE))
  22                 return 0;
  23
  24         return __execute_only_pkey(mm);
  25 }
  26
  27 extern int __arch_override_mprotect_pkey(struct vm_area_struct *vma,
  28                 int prot, int pkey);
  29 static inline int arch_override_mprotect_pkey(struct vm_area_struct *vma,
  30                 int prot, int pkey)
  31 {
  32         if (!boot_cpu_has(X86_FEATURE_OSPKE))
  33                 return 0;
  34
  35         return __arch_override_mprotect_pkey(vma, prot, pkey);
  36 }
  37
  38 extern int __arch_set_user_pkey_access(struct task_struct *tsk, int pkey,
  39                 unsigned long init_val);
  40
  41 #endif /*_ASM_X86_PKEYS_H */