xref: /openbmc/linux/arch/powerpc/include/asm/mman.h (revision 2cf1c348)
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 static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot,
17 		unsigned long pkey)
18 {
19 #ifdef CONFIG_PPC_MEM_KEYS
20 	return (((prot & PROT_SAO) ? VM_SAO : 0) | pkey_to_vmflag_bits(pkey));
21 #else
22 	return ((prot & PROT_SAO) ? VM_SAO : 0);
23 #endif
24 }
25 #define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey)
26 
27 static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags)
28 {
29 #ifdef CONFIG_PPC_MEM_KEYS
30 	return (vm_flags & VM_SAO) ?
31 		__pgprot(_PAGE_SAO | vmflag_to_pte_pkey_bits(vm_flags)) :
32 		__pgprot(0 | vmflag_to_pte_pkey_bits(vm_flags));
33 #else
34 	return (vm_flags & VM_SAO) ? __pgprot(_PAGE_SAO) : __pgprot(0);
35 #endif
36 }
37 #define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags)
38 
39 static inline bool arch_validate_prot(unsigned long prot, unsigned long addr)
40 {
41 	if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_SAO))
42 		return false;
43 	if (prot & PROT_SAO) {
44 		if (!cpu_has_feature(CPU_FTR_SAO))
45 			return false;
46 		if (firmware_has_feature(FW_FEATURE_LPAR) &&
47 		    !IS_ENABLED(CONFIG_PPC_PROT_SAO_LPAR))
48 			return false;
49 	}
50 	return true;
51 }
52 #define arch_validate_prot arch_validate_prot
53 
54 #endif /* CONFIG_PPC64 */
55 #endif	/* _ASM_POWERPC_MMAN_H */
56