LXR linux/arch/arm64/include/asm/mman.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef __ASM_MMAN_H__
   3#define __ASM_MMAN_H__
   4
   5#include <linux/compiler.h>
   6#include <linux/types.h>
   7#include <uapi/asm/mman.h>
   8
   9static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
  10        unsigned long pkey __always_unused)
  11{
  12        if (system_supports_bti() && (prot & PROT_BTI))
  13                return VM_ARM64_BTI;
  14
  15        return 0;
  16}
  17#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
  18
  19static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
  20{
  21        return (vm_flags & VM_ARM64_BTI) ? __pgprot(PTE_GP) : __pgprot(0);
  22}
  23#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
  24
  25static inline bool arch_validate_prot(unsigned long prot,
  26        unsigned long addr __always_unused)
  27{
  28        unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM;
  29
  30        if (system_supports_bti())
  31                supported |= PROT_BTI;
  32
  33        return (prot & ~supported) == 0;
  34}
  35#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
  36
  37#endif /* ! __ASM_MMAN_H__ */
  38