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mman.h
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1 /*
2  * This program is free software; you can redistribute it and/or
3  * modify it under the terms of the GNU General Public License
4  * as published by the Free Software Foundation; either version
5  * 2 of the License, or (at your option) any later version.
6  */
7 #ifndef _ASM_POWERPC_MMAN_H
8 #define _ASM_POWERPC_MMAN_H
9 
10 #include <uapi/asm/mman.h>
11 
12 #ifdef CONFIG_PPC64
13 
14 #include <asm/cputable.h>
15 #include <linux/mm.h>
16 
17 /*
18  * This file is included by linux/mman.h, so we can't use cacl_vm_prot_bits()
19  * here. How important is the optimization?
20  */
21 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot)
22 {
23  return (prot & PROT_SAO) ? VM_SAO : 0;
24 }
25 #define arch_calc_vm_prot_bits(prot) arch_calc_vm_prot_bits(prot)
26 
27 static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
28 {
29  return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
30 }
31 #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
32 
33 static inline int arch_validate_prot(unsigned long prot)
34 {
35  if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
36  return 0;
37  if ((prot & PROT_SAO) && !cpu_has_feature(CPU_FTR_SAO))
38  return 0;
39  return 1;
40 }
41 #define arch_validate_prot(prot) arch_validate_prot(prot)
42 
43 #endif /* CONFIG_PPC64 */
44 #endif /* _ASM_POWERPC_MMAN_H */