1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __ASM_MMAN_H__ 3 #define __ASM_MMAN_H__ 4 5 #include <uapi/asm/mman.h> 6 7 #ifndef BUILD_VDSO 8 #include <linux/compiler.h> 9 #include <linux/types.h> 10 11 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, 12 unsigned long pkey) 13 { 14 unsigned long ret = 0; 15 16 if (system_supports_bti() && (prot & PROT_BTI)) 17 ret |= VM_ARM64_BTI; 18 19 if (system_supports_mte() && (prot & PROT_MTE)) 20 ret |= VM_MTE; 21 22 #ifdef CONFIG_ARCH_HAS_PKEYS 23 if (system_supports_poe()) { 24 ret |= pkey & BIT(0) ? VM_PKEY_BIT0 : 0; 25 ret |= pkey & BIT(1) ? VM_PKEY_BIT1 : 0; 26 ret |= pkey & BIT(2) ? VM_PKEY_BIT2 : 0; 27 } 28 #endif 29 30 return ret; 31 } 32 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) 33 34 static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) 35 { 36 /* 37 * Only allow MTE on anonymous mappings as these are guaranteed to be 38 * backed by tags-capable memory. The vm_flags may be overridden by a 39 * filesystem supporting MTE (RAM-based). 40 */ 41 if (system_supports_mte() && (flags & MAP_ANONYMOUS)) 42 return VM_MTE_ALLOWED; 43 44 return 0; 45 } 46 #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags) 47 48 static inline bool arch_validate_prot(unsigned long prot, 49 unsigned long addr __always_unused) 50 { 51 unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM; 52 53 if (system_supports_bti()) 54 supported |= PROT_BTI; 55 56 if (system_supports_mte()) 57 supported |= PROT_MTE; 58 59 return (prot & ~supported) == 0; 60 } 61 #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) 62 63 static inline bool arch_validate_flags(unsigned long vm_flags) 64 { 65 if (!system_supports_mte()) 66 return true; 67 68 /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */ 69 return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED); 70 } 71 #define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags) 72 73 #endif /* !BUILD_VDSO */ 74 75 #endif /* ! __ASM_MMAN_H__ */ 76