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 9 static 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 19 static 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 25 static 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