1 /* Included from asm/pgtable-*.h only ! */
4 * Some bits are only used on some cpu families... Make sure that all
5 * the undefined gets a sensible default
8 #define _PAGE_HASHPTE 0
11 #define _PAGE_SHARED 0
14 #define _PAGE_HWWRITE 0
20 #define _PAGE_ENDIAN 0
22 #ifndef _PAGE_COHERENT
23 #define _PAGE_COHERENT 0
25 #ifndef _PAGE_WRITETHRU
26 #define _PAGE_WRITETHRU 0
29 #define _PAGE_4K_PFN 0
37 /* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
43 #ifndef _PMD_PRESENT_MASK
44 #define _PMD_PRESENT_MASK _PMD_PRESENT
48 #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
50 #ifndef _PAGE_KERNEL_RO
51 #define _PAGE_KERNEL_RO (_PAGE_RO)
53 #ifndef _PAGE_KERNEL_ROX
54 #define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO)
56 #ifndef _PAGE_KERNEL_RW
57 #define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
59 #ifndef _PAGE_KERNEL_RWX
60 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
62 #ifndef _PAGE_HPTEFLAGS
63 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE
65 #ifndef _PTE_NONE_MASK
66 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS
69 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
70 * kernel without large page PMD support
73 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
74 #endif /* __ASSEMBLY__ */
76 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
77 * as _PAGE_SHIFT here (ie, naturally aligned).
78 * Platform who don't just pre-define the value so we don't override it here
81 #define PTE_RPN_SHIFT (PAGE_SHIFT)
84 /* The mask convered by the RPN must be a ULL on 32-bit platforms with
87 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
88 #define PTE_RPN_MAX (1ULL << (64 - PTE_RPN_SHIFT))
89 #define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
91 #define PTE_RPN_MAX (1UL << (32 - PTE_RPN_SHIFT))
92 #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
95 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
98 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
99 _PAGE_ACCESSED | _PAGE_SPECIAL)
101 /* Mask of bits returned by pte_pgprot() */
102 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
103 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
104 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
105 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
108 * We define 2 sets of base prot bits, one for basic pages (ie,
109 * cacheable kernel and user pages) and one for non cacheable
110 * pages. We always set _PAGE_COHERENT when SMP is enabled or
111 * the processor might need it for DMA coherency.
113 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
114 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU)
115 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
117 #define _PAGE_BASE (_PAGE_BASE_NC)
120 /* Permission masks used to generate the __P and __S table,
122 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
124 * Write permissions imply read permissions for now (we could make write-only
125 * pages on BookE but we don't bother for now). Execute permission control is
126 * possible on platforms that define _PAGE_EXEC
128 * Note due to the way vm flags are laid out, the bits are XWR
130 #define PAGE_NONE __pgprot(_PAGE_BASE)
131 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
132 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
134 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
135 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
137 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
138 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
141 #define __P000 PAGE_NONE
142 #define __P001 PAGE_READONLY
143 #define __P010 PAGE_COPY
144 #define __P011 PAGE_COPY
145 #define __P100 PAGE_READONLY_X
146 #define __P101 PAGE_READONLY_X
147 #define __P110 PAGE_COPY_X
148 #define __P111 PAGE_COPY_X
150 #define __S000 PAGE_NONE
151 #define __S001 PAGE_READONLY
152 #define __S010 PAGE_SHARED
153 #define __S011 PAGE_SHARED
154 #define __S100 PAGE_READONLY_X
155 #define __S101 PAGE_READONLY_X
156 #define __S110 PAGE_SHARED_X
157 #define __S111 PAGE_SHARED_X
159 /* Permission masks used for kernel mappings */
160 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
161 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
163 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
164 _PAGE_NO_CACHE | _PAGE_GUARDED)
165 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
166 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
167 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
169 /* Protection used for kernel text. We want the debuggers to be able to
170 * set breakpoints anywhere, so don't write protect the kernel text
171 * on platforms where such control is possible.
173 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
174 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
175 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
177 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
180 /* Make modules code happy. We don't set RO yet */
181 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
184 * Don't just check for any non zero bits in __PAGE_USER, since for book3e
185 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
186 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too.
188 #define pte_user(val) ((val & _PAGE_USER) == _PAGE_USER)
190 /* Advertise special mapping type for AGP */
191 #define PAGE_AGP (PAGE_KERNEL_NC)
192 #define HAVE_PAGE_AGP
194 /* Advertise support for _PAGE_SPECIAL */
195 #define __HAVE_ARCH_PTE_SPECIAL