1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_PTE_E500_H
3 #define _ASM_POWERPC_NOHASH_PTE_E500_H
4 #ifdef __KERNEL__
5 
6 /* PTE bit definitions for processors compliant to the Book3E
7  * architecture 2.06 or later. The position of the PTE bits
8  * matches the HW definition of the optional Embedded Page Table
9  * category.
10  */
11 
12 /* Architected bits */
13 #define _PAGE_PRESENT	0x000001 /* software: pte contains a translation */
14 #define _PAGE_SW1	0x000002
15 #define _PAGE_BAP_SR	0x000004
16 #define _PAGE_BAP_UR	0x000008
17 #define _PAGE_BAP_SW	0x000010
18 #define _PAGE_BAP_UW	0x000020
19 #define _PAGE_BAP_SX	0x000040
20 #define _PAGE_BAP_UX	0x000080
21 #define _PAGE_PSIZE_MSK	0x000f00
22 #define _PAGE_PSIZE_4K	0x000200
23 #define _PAGE_PSIZE_8K	0x000300
24 #define _PAGE_PSIZE_16K	0x000400
25 #define _PAGE_PSIZE_32K	0x000500
26 #define _PAGE_PSIZE_64K	0x000600
27 #define _PAGE_PSIZE_128K	0x000700
28 #define _PAGE_PSIZE_256K	0x000800
29 #define _PAGE_PSIZE_512K	0x000900
30 #define _PAGE_PSIZE_1M	0x000a00
31 #define _PAGE_PSIZE_2M	0x000b00
32 #define _PAGE_PSIZE_4M	0x000c00
33 #define _PAGE_PSIZE_8M	0x000d00
34 #define _PAGE_PSIZE_16M	0x000e00
35 #define _PAGE_PSIZE_32M	0x000f00
36 #define _PAGE_DIRTY	0x001000 /* C: page changed */
37 #define _PAGE_SW0	0x002000
38 #define _PAGE_U3	0x004000
39 #define _PAGE_U2	0x008000
40 #define _PAGE_U1	0x010000
41 #define _PAGE_U0	0x020000
42 #define _PAGE_ACCESSED	0x040000
43 #define _PAGE_ENDIAN	0x080000
44 #define _PAGE_GUARDED	0x100000
45 #define _PAGE_COHERENT	0x200000 /* M: enforce memory coherence */
46 #define _PAGE_NO_CACHE	0x400000 /* I: cache inhibit */
47 #define _PAGE_WRITETHRU	0x800000 /* W: cache write-through */
48 
49 /* "Higher level" linux bit combinations */
50 #define _PAGE_EXEC		(_PAGE_BAP_SX | _PAGE_BAP_UX) /* .. and was cache cleaned */
51 #define _PAGE_RW		(_PAGE_BAP_SW | _PAGE_BAP_UW) /* User write permission */
52 #define _PAGE_KERNEL_RW		(_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY)
53 #define _PAGE_KERNEL_RO		(_PAGE_BAP_SR)
54 #define _PAGE_KERNEL_RWX	(_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY | _PAGE_BAP_SX)
55 #define _PAGE_KERNEL_ROX	(_PAGE_BAP_SR | _PAGE_BAP_SX)
56 #define _PAGE_USER		(_PAGE_BAP_UR | _PAGE_BAP_SR) /* Can be read */
57 #define _PAGE_PRIVILEGED	(_PAGE_BAP_SR)
58 
59 #define _PAGE_SPECIAL	_PAGE_SW0
60 
61 /* Base page size */
62 #define _PAGE_PSIZE	_PAGE_PSIZE_4K
63 #define	PTE_RPN_SHIFT	(24)
64 
65 #define PTE_WIMGE_SHIFT (19)
66 #define PTE_BAP_SHIFT	(2)
67 
68 /* On 32-bit, we never clear the top part of the PTE */
69 #ifdef CONFIG_PPC32
70 #define _PTE_NONE_MASK	0xffffffff00000000ULL
71 #define _PMD_PRESENT	0
72 #define _PMD_PRESENT_MASK (PAGE_MASK)
73 #define _PMD_BAD	(~PAGE_MASK)
74 #define _PMD_USER	0
75 #else
76 #define _PTE_NONE_MASK	0
77 #endif
78 
79 /*
80  * We define 2 sets of base prot bits, one for basic pages (ie,
81  * cacheable kernel and user pages) and one for non cacheable
82  * pages. We always set _PAGE_COHERENT when SMP is enabled or
83  * the processor might need it for DMA coherency.
84  */
85 #define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
86 #if defined(CONFIG_SMP)
87 #define _PAGE_BASE	(_PAGE_BASE_NC | _PAGE_COHERENT)
88 #else
89 #define _PAGE_BASE	(_PAGE_BASE_NC)
90 #endif
91 
92 /* Permission masks used to generate the __P and __S table */
93 #define PAGE_NONE	__pgprot(_PAGE_BASE)
94 #define PAGE_SHARED	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
95 #define PAGE_SHARED_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_BAP_UX)
96 #define PAGE_COPY	__pgprot(_PAGE_BASE | _PAGE_USER)
97 #define PAGE_COPY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_BAP_UX)
98 #define PAGE_READONLY	__pgprot(_PAGE_BASE | _PAGE_USER)
99 #define PAGE_READONLY_X	__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_BAP_UX)
100 
101 #ifndef __ASSEMBLY__
102 static inline pte_t pte_mkprivileged(pte_t pte)
103 {
104 	return __pte((pte_val(pte) & ~_PAGE_USER) | _PAGE_PRIVILEGED);
105 }
106 
107 #define pte_mkprivileged pte_mkprivileged
108 
109 static inline pte_t pte_mkuser(pte_t pte)
110 {
111 	return __pte((pte_val(pte) & ~_PAGE_PRIVILEGED) | _PAGE_USER);
112 }
113 
114 #define pte_mkuser pte_mkuser
115 
116 static inline pte_t pte_mkexec(pte_t pte)
117 {
118 	if (pte_val(pte) & _PAGE_BAP_UR)
119 		return __pte((pte_val(pte) & ~_PAGE_BAP_SX) | _PAGE_BAP_UX);
120 	else
121 		return __pte((pte_val(pte) & ~_PAGE_BAP_UX) | _PAGE_BAP_SX);
122 }
123 #define pte_mkexec pte_mkexec
124 
125 #endif /* __ASSEMBLY__ */
126 
127 #endif /* __KERNEL__ */
128 #endif /*  _ASM_POWERPC_NOHASH_PTE_E500_H */
129