| /* SPDX-License-Identifier: GPL-2.0 */ |
| #ifndef __ASM_MMAN_H__ |
| #define __ASM_MMAN_H__ |
| |
| #include <linux/compiler.h> |
| #include <linux/types.h> |
| #include <uapi/asm/mman.h> |
| |
| static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, |
| unsigned long pkey __always_unused) |
| { |
| if (system_supports_bti() && (prot & PROT_BTI)) |
| return VM_ARM64_BTI; |
| |
| return 0; |
| } |
| #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) |
| |
| static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) |
| { |
| return (vm_flags & VM_ARM64_BTI) ? __pgprot(PTE_GP) : __pgprot(0); |
| } |
| #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) |
| |
| static inline bool arch_validate_prot(unsigned long prot, |
| unsigned long addr __always_unused) |
| { |
| unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM; |
| |
| if (system_supports_bti()) |
| supported |= PROT_BTI; |
| |
| return (prot & ~supported) == 0; |
| } |
| #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) |
| |
| #endif /* ! __ASM_MMAN_H__ */ |
