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