xref: /openbmc/linux/include/linux/pkeys.h (revision f3539c12)
1 #ifndef _LINUX_PKEYS_H
2 #define _LINUX_PKEYS_H
3 
4 #include <linux/mm_types.h>
5 #include <asm/mmu_context.h>
6 
7 #define PKEY_DISABLE_ACCESS	0x1
8 #define PKEY_DISABLE_WRITE	0x2
9 #define PKEY_ACCESS_MASK	(PKEY_DISABLE_ACCESS |\
10 				 PKEY_DISABLE_WRITE)
11 
12 #ifdef CONFIG_ARCH_HAS_PKEYS
13 #include <asm/pkeys.h>
14 #else /* ! CONFIG_ARCH_HAS_PKEYS */
15 #define arch_max_pkey() (1)
16 #define execute_only_pkey(mm) (0)
17 #define arch_override_mprotect_pkey(vma, prot, pkey) (0)
18 #define PKEY_DEDICATED_EXECUTE_ONLY 0
19 #endif /* ! CONFIG_ARCH_HAS_PKEYS */
20 
21 /*
22  * This is called from mprotect_pkey().
23  *
24  * Returns true if the protection keys is valid.
25  */
26 static inline bool validate_pkey(int pkey)
27 {
28 	if (pkey < 0)
29 		return false;
30 	return (pkey < arch_max_pkey());
31 }
32 
33 #endif /* _LINUX_PKEYS_H */
34