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/arch/powerpc/include/asm/mman.h

http://github.com/mirrors/linux
C Header | 54 lines | 40 code | 7 blank | 7 comment | 3 complexity | 67b09ae2bf1078ad6f621e11772d5d89 MD5 | raw file
 1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 */
 4#ifndef _ASM_POWERPC_MMAN_H
 5#define _ASM_POWERPC_MMAN_H
 6
 7#include <uapi/asm/mman.h>
 8
 9#ifdef CONFIG_PPC64
10
11#include <asm/cputable.h>
12#include <linux/mm.h>
13#include <linux/pkeys.h>
14#include <asm/cpu_has_feature.h>
15
16/*
17 * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
18 * here.  How important is the optimization?
19 */
20static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
21		unsigned long pkey)
22{
23#ifdef CONFIG_PPC_MEM_KEYS
24	return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
25#else
26	return ((prot & PROT_SAO) ? VM_SAO : 0);
27#endif
28}
29#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
30
31static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
32{
33#ifdef CONFIG_PPC_MEM_KEYS
34	return (vm_flags & VM_SAO) ?
35		__pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
36		__pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
37#else
38	return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
39#endif
40}
41#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
42
43static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
44{
45	if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
46		return false;
47	if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
48		return false;
49	return true;
50}
51#define arch_validate_prot arch_validate_prot
52
53#endif /* CONFIG_PPC64 */
54#endif	/* _ASM_POWERPC_MMAN_H */