1 #ifndef _ASM_X86_PGTABLE_DEFS_H
2 #define _ASM_X86_PGTABLE_DEFS_H
4 #include <linux/const.h>
5 #include <asm/page_types.h>
7 #define FIRST_USER_ADDRESS 0
9 #define _PAGE_BIT_PRESENT 0 /* is present */
10 #define _PAGE_BIT_RW 1 /* writeable */
11 #define _PAGE_BIT_USER 2 /* userspace addressable */
12 #define _PAGE_BIT_PWT 3 /* page write through */
13 #define _PAGE_BIT_PCD 4 /* page cache disabled */
14 #define _PAGE_BIT_ACCESSED 5 /* was accessed (raised by CPU) */
15 #define _PAGE_BIT_DIRTY 6 /* was written to (raised by CPU) */
16 #define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
17 #define _PAGE_BIT_PAT 7 /* on 4KB pages */
18 #define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
19 #define _PAGE_BIT_UNUSED1 9 /* available for programmer */
20 #define _PAGE_BIT_IOMAP 10 /* flag used to indicate IO mapping */
21 #define _PAGE_BIT_HIDDEN 11 /* hidden by kmemcheck */
22 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
23 #define _PAGE_BIT_SPECIAL _PAGE_BIT_UNUSED1
24 #define _PAGE_BIT_CPA_TEST _PAGE_BIT_UNUSED1
25 #define _PAGE_BIT_SPLITTING _PAGE_BIT_UNUSED1 /* only valid on a PSE pmd */
26 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
28 /* If _PAGE_BIT_PRESENT is clear, we use these: */
29 /* - if the user mapped it with PROT_NONE; pte_present gives true */
30 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
31 /* - set: nonlinear file mapping, saved PTE; unset:swap */
32 #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
34 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
35 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
36 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
37 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
38 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
39 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
40 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
41 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
42 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
43 #define _PAGE_UNUSED1 (_AT(pteval_t, 1) << _PAGE_BIT_UNUSED1)
44 #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
45 #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
46 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
47 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
48 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
49 #define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
50 #define __HAVE_ARCH_PTE_SPECIAL
52 #ifdef CONFIG_KMEMCHECK
53 #define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
55 #define _PAGE_HIDDEN (_AT(pteval_t, 0))
59 * The same hidden bit is used by kmemcheck, but since kmemcheck
60 * works on kernel pages while soft-dirty engine on user space,
61 * they do not conflict with each other.
64 #define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_HIDDEN
66 #ifdef CONFIG_MEM_SOFT_DIRTY
67 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
69 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 0))
73 * Tracking soft dirty bit when a page goes to a swap is tricky.
74 * We need a bit which can be stored in pte _and_ not conflict
75 * with swap entry format. On x86 bits 6 and 7 are *not* involved
76 * into swap entry computation, but bit 6 is used for nonlinear
77 * file mapping, so we borrow bit 7 for soft dirty tracking.
79 * Please note that this bit must be treated as swap dirty page
80 * mark if and only if the PTE has present bit clear!
82 #ifdef CONFIG_MEM_SOFT_DIRTY
83 #define _PAGE_SWP_SOFT_DIRTY _PAGE_PSE
85 #define _PAGE_SWP_SOFT_DIRTY (_AT(pteval_t, 0))
88 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
89 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
91 #define _PAGE_NX (_AT(pteval_t, 0))
94 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
95 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
98 * _PAGE_NUMA indicates that this page will trigger a numa hinting
99 * minor page fault to gather numa placement statistics (see
100 * pte_numa()). The bit picked (8) is within the range between
101 * _PAGE_FILE (6) and _PAGE_PROTNONE (8) bits. Therefore, it doesn't
102 * require changes to the swp entry format because that bit is always
103 * zero when the pte is not present.
105 * The bit picked must be always zero when the pmd is present and not
106 * present, so that we don't lose information when we set it while
107 * atomically clearing the present bit.
109 * Because we shared the same bit (8) with _PAGE_PROTNONE this can be
110 * interpreted as _PAGE_NUMA only in places that _PAGE_PROTNONE
111 * couldn't reach, like handle_mm_fault() (see access_error in
112 * arch/x86/mm/fault.c, the vma protection must not be PROT_NONE for
113 * handle_mm_fault() to be invoked).
115 #define _PAGE_NUMA _PAGE_PROTNONE
117 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
118 _PAGE_ACCESSED | _PAGE_DIRTY)
119 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
122 /* Set of bits not changed in pte_modify */
123 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
124 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
126 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE)
128 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
129 #define _PAGE_CACHE_WB (0)
130 #define _PAGE_CACHE_WC (_PAGE_PWT)
131 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
132 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
134 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
135 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
136 _PAGE_ACCESSED | _PAGE_NX)
138 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
139 _PAGE_USER | _PAGE_ACCESSED)
140 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
141 _PAGE_ACCESSED | _PAGE_NX)
142 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
144 #define PAGE_COPY PAGE_COPY_NOEXEC
145 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
146 _PAGE_ACCESSED | _PAGE_NX)
147 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
150 #define __PAGE_KERNEL_EXEC \
151 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
152 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
154 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
155 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
156 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
157 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
158 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
159 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
160 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
161 #define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO | _PAGE_USER)
162 #define __PAGE_KERNEL_VVAR_NOCACHE (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
163 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
164 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
165 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
167 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
168 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
169 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
170 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
172 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
173 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
174 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
175 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
176 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
177 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
178 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
179 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
180 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
181 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
182 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
183 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
184 #define PAGE_KERNEL_VVAR __pgprot(__PAGE_KERNEL_VVAR)
185 #define PAGE_KERNEL_VVAR_NOCACHE __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
187 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
188 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
189 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
190 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
193 #define __P000 PAGE_NONE
194 #define __P001 PAGE_READONLY
195 #define __P010 PAGE_COPY
196 #define __P011 PAGE_COPY
197 #define __P100 PAGE_READONLY_EXEC
198 #define __P101 PAGE_READONLY_EXEC
199 #define __P110 PAGE_COPY_EXEC
200 #define __P111 PAGE_COPY_EXEC
202 #define __S000 PAGE_NONE
203 #define __S001 PAGE_READONLY
204 #define __S010 PAGE_SHARED
205 #define __S011 PAGE_SHARED
206 #define __S100 PAGE_READONLY_EXEC
207 #define __S101 PAGE_READONLY_EXEC
208 #define __S110 PAGE_SHARED_EXEC
209 #define __S111 PAGE_SHARED_EXEC
212 * early identity mapping pte attrib macros.
215 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
217 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
218 #define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
219 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
223 # include <asm/pgtable_32_types.h>
225 # include <asm/pgtable_64_types.h>
230 #include <linux/types.h>
232 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
233 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
235 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
236 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
238 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
240 typedef struct { pgdval_t pgd; } pgd_t;
242 static inline pgd_t native_make_pgd(pgdval_t val)
244 return (pgd_t) { val };
247 static inline pgdval_t native_pgd_val(pgd_t pgd)
252 static inline pgdval_t pgd_flags(pgd_t pgd)
254 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
257 #if PAGETABLE_LEVELS > 3
258 typedef struct { pudval_t pud; } pud_t;
260 static inline pud_t native_make_pud(pmdval_t val)
262 return (pud_t) { val };
265 static inline pudval_t native_pud_val(pud_t pud)
270 #include <asm-generic/pgtable-nopud.h>
272 static inline pudval_t native_pud_val(pud_t pud)
274 return native_pgd_val(pud.pgd);
278 #if PAGETABLE_LEVELS > 2
279 typedef struct { pmdval_t pmd; } pmd_t;
281 static inline pmd_t native_make_pmd(pmdval_t val)
283 return (pmd_t) { val };
286 static inline pmdval_t native_pmd_val(pmd_t pmd)
291 #include <asm-generic/pgtable-nopmd.h>
293 static inline pmdval_t native_pmd_val(pmd_t pmd)
295 return native_pgd_val(pmd.pud.pgd);
299 static inline pudval_t pud_flags(pud_t pud)
301 return native_pud_val(pud) & PTE_FLAGS_MASK;
304 static inline pmdval_t pmd_flags(pmd_t pmd)
306 return native_pmd_val(pmd) & PTE_FLAGS_MASK;
309 static inline pte_t native_make_pte(pteval_t val)
311 return (pte_t) { .pte = val };
314 static inline pteval_t native_pte_val(pte_t pte)
319 static inline pteval_t pte_flags(pte_t pte)
321 return native_pte_val(pte) & PTE_FLAGS_MASK;
324 #define pgprot_val(x) ((x).pgprot)
325 #define __pgprot(x) ((pgprot_t) { (x) } )
328 typedef struct page *pgtable_t;
330 extern pteval_t __supported_pte_mask;
331 extern void set_nx(void);
332 extern int nx_enabled;
334 #define pgprot_writecombine pgprot_writecombine
335 extern pgprot_t pgprot_writecombine(pgprot_t prot);
337 /* Indicate that x86 has its own track and untrack pfn vma functions */
338 #define __HAVE_PFNMAP_TRACKING
340 #define __HAVE_PHYS_MEM_ACCESS_PROT
342 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
343 unsigned long size, pgprot_t vma_prot);
344 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
345 unsigned long size, pgprot_t *vma_prot);
347 /* Install a pte for a particular vaddr in kernel space. */
348 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
351 extern void native_pagetable_init(void);
353 #define native_pagetable_init paging_init
357 extern void arch_report_meminfo(struct seq_file *m);
367 #ifdef CONFIG_PROC_FS
368 extern void update_page_count(int level, unsigned long pages);
370 static inline void update_page_count(int level, unsigned long pages) { }
374 * Helper function that returns the kernel pagetable entry controlling
375 * the virtual address 'address'. NULL means no pagetable entry present.
376 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
379 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
380 extern phys_addr_t slow_virt_to_phys(void *__address);
381 extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
382 unsigned numpages, unsigned long page_flags);
383 #endif /* !__ASSEMBLY__ */
385 #endif /* _ASM_X86_PGTABLE_DEFS_H */