tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/* Included from asm/pgtable-*.h only ! */
2
3/*
4 * Some bits are only used on some cpu families... Make sure that all
5 * the undefined gets a sensible default
6 */
7#ifndef _PAGE_HASHPTE
8#define _PAGE_HASHPTE 0
9#endif
10#ifndef _PAGE_SHARED
11#define _PAGE_SHARED 0
12#endif
13#ifndef _PAGE_HWWRITE
14#define _PAGE_HWWRITE 0
15#endif
16#ifndef _PAGE_EXEC
17#define _PAGE_EXEC 0
18#endif
19#ifndef _PAGE_ENDIAN
20#define _PAGE_ENDIAN 0
21#endif
22#ifndef _PAGE_COHERENT
23#define _PAGE_COHERENT 0
24#endif
25#ifndef _PAGE_WRITETHRU
26#define _PAGE_WRITETHRU 0
27#endif
28#ifndef _PAGE_4K_PFN
29#define _PAGE_4K_PFN 0
30#endif
31#ifndef _PAGE_SAO
32#define _PAGE_SAO 0
33#endif
34#ifndef _PAGE_PSIZE
35#define _PAGE_PSIZE 0
36#endif
37/* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
38#ifndef _PAGE_RO
39#define _PAGE_RO 0
40#else
41#define _PAGE_RW 0
42#endif
43
44#ifndef _PAGE_PTE
45#define _PAGE_PTE 0
46#endif
47
48#ifndef _PMD_PRESENT_MASK
49#define _PMD_PRESENT_MASK _PMD_PRESENT
50#endif
51#ifndef _PMD_SIZE
52#define _PMD_SIZE 0
53#define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
54#endif
55#ifndef _PAGE_KERNEL_RO
56#define _PAGE_KERNEL_RO (_PAGE_RO)
57#endif
58#ifndef _PAGE_KERNEL_ROX
59#define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO)
60#endif
61#ifndef _PAGE_KERNEL_RW
62#define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
63#endif
64#ifndef _PAGE_KERNEL_RWX
65#define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
66#endif
67#ifndef _PAGE_HPTEFLAGS
68#define _PAGE_HPTEFLAGS _PAGE_HASHPTE
69#endif
70#ifndef _PTE_NONE_MASK
71#define _PTE_NONE_MASK _PAGE_HPTEFLAGS
72#endif
73
74/* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
75 * kernel without large page PMD support
76 */
77#ifndef __ASSEMBLY__
78extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
79
80/*
81 * Don't just check for any non zero bits in __PAGE_USER, since for book3e
82 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
83 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too.
84 */
85static inline bool pte_user(pte_t pte)
86{
87 return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
88}
89#endif /* __ASSEMBLY__ */
90
91/* Location of the PFN in the PTE. Most 32-bit platforms use the same
92 * as _PAGE_SHIFT here (ie, naturally aligned).
93 * Platform who don't just pre-define the value so we don't override it here
94 */
95#ifndef PTE_RPN_SHIFT
96#define PTE_RPN_SHIFT (PAGE_SHIFT)
97#endif
98
99/* The mask covered by the RPN must be a ULL on 32-bit platforms with
100 * 64-bit PTEs
101 */
102#if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
103#define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
104#else
105#define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
106#endif
107
108/* _PAGE_CHG_MASK masks of bits that are to be preserved across
109 * pgprot changes
110 */
111#define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
112 _PAGE_ACCESSED | _PAGE_SPECIAL)
113
114/* Mask of bits returned by pte_pgprot() */
115#define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
116 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
117 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
118 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
119
120/*
121 * We define 2 sets of base prot bits, one for basic pages (ie,
122 * cacheable kernel and user pages) and one for non cacheable
123 * pages. We always set _PAGE_COHERENT when SMP is enabled or
124 * the processor might need it for DMA coherency.
125 */
126#define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
127#if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
128 defined(CONFIG_PPC_E500MC)
129#define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
130#else
131#define _PAGE_BASE (_PAGE_BASE_NC)
132#endif
133
134/* Permission masks used to generate the __P and __S table,
135 *
136 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
137 *
138 * Write permissions imply read permissions for now (we could make write-only
139 * pages on BookE but we don't bother for now). Execute permission control is
140 * possible on platforms that define _PAGE_EXEC
141 *
142 * Note due to the way vm flags are laid out, the bits are XWR
143 */
144#define PAGE_NONE __pgprot(_PAGE_BASE)
145#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
146#define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
147 _PAGE_EXEC)
148#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
149#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
150 _PAGE_EXEC)
151#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
152#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
153 _PAGE_EXEC)
154
155#define __P000 PAGE_NONE
156#define __P001 PAGE_READONLY
157#define __P010 PAGE_COPY
158#define __P011 PAGE_COPY
159#define __P100 PAGE_READONLY_X
160#define __P101 PAGE_READONLY_X
161#define __P110 PAGE_COPY_X
162#define __P111 PAGE_COPY_X
163
164#define __S000 PAGE_NONE
165#define __S001 PAGE_READONLY
166#define __S010 PAGE_SHARED
167#define __S011 PAGE_SHARED
168#define __S100 PAGE_READONLY_X
169#define __S101 PAGE_READONLY_X
170#define __S110 PAGE_SHARED_X
171#define __S111 PAGE_SHARED_X
172
173/* Permission masks used for kernel mappings */
174#define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
175#define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
176 _PAGE_NO_CACHE)
177#define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
178 _PAGE_NO_CACHE | _PAGE_GUARDED)
179#define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
180#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
181#define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
182
183/* Protection used for kernel text. We want the debuggers to be able to
184 * set breakpoints anywhere, so don't write protect the kernel text
185 * on platforms where such control is possible.
186 */
187#if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
188 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
189#define PAGE_KERNEL_TEXT PAGE_KERNEL_X
190#else
191#define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
192#endif
193
194/* Make modules code happy. We don't set RO yet */
195#define PAGE_KERNEL_EXEC PAGE_KERNEL_X
196
197/* Advertise special mapping type for AGP */
198#define PAGE_AGP (PAGE_KERNEL_NC)
199#define HAVE_PAGE_AGP
200
201/* Advertise support for _PAGE_SPECIAL */
202#define __HAVE_ARCH_PTE_SPECIAL
203
204#ifndef _PAGE_READ
205/* if not defined, we should not find _PAGE_WRITE too */
206#define _PAGE_READ 0
207#define _PAGE_WRITE _PAGE_RW
208#endif
209
210#ifndef H_PAGE_4K_PFN
211#define H_PAGE_4K_PFN 0
212#endif