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-rw-r--r--arch/arm64/include/asm/mman.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/mman.h b/arch/arm64/include/asm/mman.h
new file mode 100644
index 000000000..5966ee4a6
--- /dev/null
+++ b/arch/arm64/include/asm/mman.h
@@ -0,0 +1,63 @@
+/* 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__ */