1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Included from asm/pgtable-*.h only ! */
5 * Some bits are only used on some cpu families... Make sure that all
6 * the undefined gets a sensible default
9 #define _PAGE_HASHPTE 0
12 #define _PAGE_SHARED 0
15 #define _PAGE_HWWRITE 0
21 #define _PAGE_ENDIAN 0
23 #ifndef _PAGE_COHERENT
24 #define _PAGE_COHERENT 0
26 #ifndef _PAGE_WRITETHRU
27 #define _PAGE_WRITETHRU 0
30 #define _PAGE_4K_PFN 0
38 /* _PAGE_RO and _PAGE_RW shall not be defined at the same time */
49 #ifndef _PMD_PRESENT_MASK
50 #define _PMD_PRESENT_MASK _PMD_PRESENT
54 #define PMD_PAGE_SIZE(pmd) bad_call_to_PMD_PAGE_SIZE()
56 #ifndef _PAGE_KERNEL_RO
57 #define _PAGE_KERNEL_RO (_PAGE_RO)
59 #ifndef _PAGE_KERNEL_ROX
60 #define _PAGE_KERNEL_ROX (_PAGE_EXEC | _PAGE_RO)
62 #ifndef _PAGE_KERNEL_RW
63 #define _PAGE_KERNEL_RW (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE)
65 #ifndef _PAGE_KERNEL_RWX
66 #define _PAGE_KERNEL_RWX (_PAGE_DIRTY | _PAGE_RW | _PAGE_HWWRITE | _PAGE_EXEC)
68 #ifndef _PAGE_HPTEFLAGS
69 #define _PAGE_HPTEFLAGS _PAGE_HASHPTE
71 #ifndef _PTE_NONE_MASK
72 #define _PTE_NONE_MASK _PAGE_HPTEFLAGS
75 /* Make sure we get a link error if PMD_PAGE_SIZE is ever called on a
76 * kernel without large page PMD support
79 extern unsigned long bad_call_to_PMD_PAGE_SIZE(void);
82 * Don't just check for any non zero bits in __PAGE_USER, since for book3e
83 * and PTE_64BIT, PAGE_KERNEL_X contains _PAGE_BAP_SR which is also in
84 * _PAGE_USER. Need to explicitly match _PAGE_BAP_UR bit in that case too.
86 static inline bool pte_user(pte_t pte)
88 return (pte_val(pte) & _PAGE_USER) == _PAGE_USER;
90 #endif /* __ASSEMBLY__ */
92 /* Location of the PFN in the PTE. Most 32-bit platforms use the same
93 * as _PAGE_SHIFT here (ie, naturally aligned).
94 * Platform who don't just pre-define the value so we don't override it here
97 #define PTE_RPN_SHIFT (PAGE_SHIFT)
100 /* The mask covered by the RPN must be a ULL on 32-bit platforms with
103 #if defined(CONFIG_PPC32) && defined(CONFIG_PTE_64BIT)
104 #define PTE_RPN_MASK (~((1ULL<<PTE_RPN_SHIFT)-1))
105 #define MAX_POSSIBLE_PHYSMEM_BITS 36
107 #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
108 #define MAX_POSSIBLE_PHYSMEM_BITS 32
111 /* _PAGE_CHG_MASK masks of bits that are to be preserved across
114 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
115 _PAGE_ACCESSED | _PAGE_SPECIAL)
117 /* Mask of bits returned by pte_pgprot() */
118 #define PAGE_PROT_BITS (_PAGE_GUARDED | _PAGE_COHERENT | _PAGE_NO_CACHE | \
119 _PAGE_WRITETHRU | _PAGE_ENDIAN | _PAGE_4K_PFN | \
120 _PAGE_USER | _PAGE_ACCESSED | _PAGE_RO | \
121 _PAGE_RW | _PAGE_HWWRITE | _PAGE_DIRTY | _PAGE_EXEC)
124 * We define 2 sets of base prot bits, one for basic pages (ie,
125 * cacheable kernel and user pages) and one for non cacheable
126 * pages. We always set _PAGE_COHERENT when SMP is enabled or
127 * the processor might need it for DMA coherency.
129 #define _PAGE_BASE_NC (_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_PSIZE)
130 #if defined(CONFIG_SMP) || defined(CONFIG_PPC_STD_MMU) || \
131 defined(CONFIG_PPC_E500MC)
132 #define _PAGE_BASE (_PAGE_BASE_NC | _PAGE_COHERENT)
134 #define _PAGE_BASE (_PAGE_BASE_NC)
137 /* Permission masks used to generate the __P and __S table,
139 * Note:__pgprot is defined in arch/powerpc/include/asm/page.h
141 * Write permissions imply read permissions for now (we could make write-only
142 * pages on BookE but we don't bother for now). Execute permission control is
143 * possible on platforms that define _PAGE_EXEC
145 * Note due to the way vm flags are laid out, the bits are XWR
147 #define PAGE_NONE __pgprot(_PAGE_BASE)
148 #define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
149 #define PAGE_SHARED_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | \
151 #define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
152 #define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
154 #define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO)
155 #define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RO | \
158 #define __P000 PAGE_NONE
159 #define __P001 PAGE_READONLY
160 #define __P010 PAGE_COPY
161 #define __P011 PAGE_COPY
162 #define __P100 PAGE_READONLY_X
163 #define __P101 PAGE_READONLY_X
164 #define __P110 PAGE_COPY_X
165 #define __P111 PAGE_COPY_X
167 #define __S000 PAGE_NONE
168 #define __S001 PAGE_READONLY
169 #define __S010 PAGE_SHARED
170 #define __S011 PAGE_SHARED
171 #define __S100 PAGE_READONLY_X
172 #define __S101 PAGE_READONLY_X
173 #define __S110 PAGE_SHARED_X
174 #define __S111 PAGE_SHARED_X
176 /* Permission masks used for kernel mappings */
177 #define PAGE_KERNEL __pgprot(_PAGE_BASE | _PAGE_KERNEL_RW)
178 #define PAGE_KERNEL_NC __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
180 #define PAGE_KERNEL_NCG __pgprot(_PAGE_BASE_NC | _PAGE_KERNEL_RW | \
181 _PAGE_NO_CACHE | _PAGE_GUARDED)
182 #define PAGE_KERNEL_X __pgprot(_PAGE_BASE | _PAGE_KERNEL_RWX)
183 #define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_KERNEL_RO)
184 #define PAGE_KERNEL_ROX __pgprot(_PAGE_BASE | _PAGE_KERNEL_ROX)
186 /* Protection used for kernel text. We want the debuggers to be able to
187 * set breakpoints anywhere, so don't write protect the kernel text
188 * on platforms where such control is possible.
190 #if defined(CONFIG_KGDB) || defined(CONFIG_XMON) || defined(CONFIG_BDI_SWITCH) ||\
191 defined(CONFIG_KPROBES) || defined(CONFIG_DYNAMIC_FTRACE)
192 #define PAGE_KERNEL_TEXT PAGE_KERNEL_X
194 #define PAGE_KERNEL_TEXT PAGE_KERNEL_ROX
197 /* Make modules code happy. We don't set RO yet */
198 #define PAGE_KERNEL_EXEC PAGE_KERNEL_X
200 /* Advertise special mapping type for AGP */
201 #define PAGE_AGP (PAGE_KERNEL_NC)
202 #define HAVE_PAGE_AGP
204 /* Advertise support for _PAGE_SPECIAL */
205 #define __HAVE_ARCH_PTE_SPECIAL
208 /* if not defined, we should not find _PAGE_WRITE too */
210 #define _PAGE_WRITE _PAGE_RW
213 #ifndef H_PAGE_4K_PFN
214 #define H_PAGE_4K_PFN 0