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 */
48 #ifndef _PMD_PRESENT_MASK
49 #define _PMD_PRESENT_MASK _PMD_PRESENT
53 #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
55 #ifndef _PAGE_KERNEL_RO
56 #define _PAGE_KERNEL_RO (_PAGE_RO)
58 #ifndef _PAGE_KERNEL_ROX
59 #define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO)
61 #ifndef _PAGE_KERNEL_RW
62 #define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
64 #ifndef _PAGE_KERNEL_RWX
65 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
67 #ifndef _PAGE_HPTEFLAGS
68 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE
70 #ifndef _PTE_NONE_MASK
71 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS
74 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
75 * kernel without large page PMD support
78 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
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.
85 static inline bool pte_user(pte_t pte)
87 return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
89 #endif /* __ASSEMBLY__ */
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
96 #define PTE_RPN_SHIFT (PAGE_SHIFT)
99 /* The mask covered by the RPN must be a ULL on 32-bit platforms with
102 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
103 #define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
104 #define MAX_POSSIBLE_PHYSMEM_BITS 36
106 #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
107 #define MAX_POSSIBLE_PHYSMEM_BITS 32
110 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
113 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
114 _PAGE_ACCESSED | _PAGE_SPECIAL)
116 /* Mask of bits returned by pte_pgprot() */
117 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
118 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
119 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
120 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
123 * We define 2 sets of base prot bits, one for basic pages (ie,
124 * cacheable kernel and user pages) and one for non cacheable
125 * pages. We always set _PAGE_COHERENT when SMP is enabled or
126 * the processor might need it for DMA coherency.
128 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
129 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
130 defined(CONFIG_PPC_E500MC)
131 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
133 #define _PAGE_BASE (_PAGE_BASE_NC)
136 /* Permission masks used to generate the __P and __S table,
138 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
140 * Write permissions imply read permissions for now (we could make write-only
141 * pages on BookE but we don't bother for now). Execute permission control is
142 * possible on platforms that define _PAGE_EXEC
144 * Note due to the way vm flags are laid out, the bits are XWR
146 #define PAGE_NONE __pgprot(_PAGE_BASE)
147 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
148 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
150 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
151 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
153 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
154 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
157 #define __P000 PAGE_NONE
158 #define __P001 PAGE_READONLY
159 #define __P010 PAGE_COPY
160 #define __P011 PAGE_COPY
161 #define __P100 PAGE_READONLY_X
162 #define __P101 PAGE_READONLY_X
163 #define __P110 PAGE_COPY_X
164 #define __P111 PAGE_COPY_X
166 #define __S000 PAGE_NONE
167 #define __S001 PAGE_READONLY
168 #define __S010 PAGE_SHARED
169 #define __S011 PAGE_SHARED
170 #define __S100 PAGE_READONLY_X
171 #define __S101 PAGE_READONLY_X
172 #define __S110 PAGE_SHARED_X
173 #define __S111 PAGE_SHARED_X
175 /* Permission masks used for kernel mappings */
176 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
177 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
179 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
180 _PAGE_NO_CACHE | _PAGE_GUARDED)
181 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
182 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
183 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
185 /* Protection used for kernel text. We want the debuggers to be able to
186 * set breakpoints anywhere, so don't write protect the kernel text
187 * on platforms where such control is possible.
189 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
190 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
191 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
193 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
196 /* Make modules code happy. We don't set RO yet */
197 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
199 /* Advertise special mapping type for AGP */
200 #define PAGE_AGP (PAGE_KERNEL_NC)
201 #define HAVE_PAGE_AGP
203 /* Advertise support for _PAGE_SPECIAL */
204 #define __HAVE_ARCH_PTE_SPECIAL
207 /* if not defined, we should not find _PAGE_WRITE too */
209 #define _PAGE_WRITE _PAGE_RW
212 #ifndef H_PAGE_4K_PFN
213 #define H_PAGE_4K_PFN 0