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- /* 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)
- {
- unsigned long ret = 0;
- if (system_supports_bti() && (prot & PROT_BTI))
- ret |= VM_ARM64_BTI;
- if (system_supports_mte() && (prot & PROT_MTE))
- ret |= VM_MTE;
- return ret;
- }
- #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
- static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags)
- {
- /*
- * Only allow MTE on anonymous mappings as these are guaranteed to be
- * backed by tags-capable memory. The vm_flags may be overridden by a
- * filesystem supporting MTE (RAM-based).
- */
- if (system_supports_mte() && (flags & MAP_ANONYMOUS))
- return VM_MTE_ALLOWED;
- return 0;
- }
- #define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(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;
- if (system_supports_mte())
- supported |= PROT_MTE;
- return (prot & ~supported) == 0;
- }
- #define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr)
- static inline bool arch_validate_flags(unsigned long vm_flags)
- {
- if (!system_supports_mte())
- return true;
- /* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */
- return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED);
- }
- #define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
- #endif /* ! __ASM_MMAN_H__ */
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