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_SOFTW1 9 /* available for programmer */
20 #define _PAGE_BIT_SOFTW2 10 /* " */
21 #define _PAGE_BIT_SOFTW3 11 /* " */
22 #define _PAGE_BIT_PAT_LARGE 12 /* On 2MB or 1GB pages */
23 #define _PAGE_BIT_SPECIAL _PAGE_BIT_SOFTW1
24 #define _PAGE_BIT_CPA_TEST _PAGE_BIT_SOFTW1
25 #define _PAGE_BIT_SPLITTING _PAGE_BIT_SOFTW2 /* only valid on a PSE pmd */
26 #define _PAGE_BIT_IOMAP _PAGE_BIT_SOFTW2 /* flag used to indicate IO mapping */
27 #define _PAGE_BIT_HIDDEN _PAGE_BIT_SOFTW3 /* hidden by kmemcheck */
28 #define _PAGE_BIT_SOFT_DIRTY _PAGE_BIT_SOFTW3 /* software dirty tracking */
29 #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
32 * Swap offsets on configurations that allow automatic NUMA balancing use the
33 * bits after _PAGE_BIT_GLOBAL. To uniquely distinguish NUMA hinting PTEs from
34 * swap entries, we use the first bit after _PAGE_BIT_GLOBAL and shrink the
35 * maximum possible swap space from 16TB to 8TB.
37 #define _PAGE_BIT_NUMA (_PAGE_BIT_GLOBAL+1)
39 /* If _PAGE_BIT_PRESENT is clear, we use these: */
40 /* - if the user mapped it with PROT_NONE; pte_present gives true */
41 #define _PAGE_BIT_PROTNONE _PAGE_BIT_GLOBAL
42 /* - set: nonlinear file mapping, saved PTE; unset:swap */
43 #define _PAGE_BIT_FILE _PAGE_BIT_DIRTY
45 #define _PAGE_PRESENT (_AT(pteval_t, 1) << _PAGE_BIT_PRESENT)
46 #define _PAGE_RW (_AT(pteval_t, 1) << _PAGE_BIT_RW)
47 #define _PAGE_USER (_AT(pteval_t, 1) << _PAGE_BIT_USER)
48 #define _PAGE_PWT (_AT(pteval_t, 1) << _PAGE_BIT_PWT)
49 #define _PAGE_PCD (_AT(pteval_t, 1) << _PAGE_BIT_PCD)
50 #define _PAGE_ACCESSED (_AT(pteval_t, 1) << _PAGE_BIT_ACCESSED)
51 #define _PAGE_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_DIRTY)
52 #define _PAGE_PSE (_AT(pteval_t, 1) << _PAGE_BIT_PSE)
53 #define _PAGE_GLOBAL (_AT(pteval_t, 1) << _PAGE_BIT_GLOBAL)
54 #define _PAGE_SOFTW1 (_AT(pteval_t, 1) << _PAGE_BIT_SOFTW1)
55 #define _PAGE_IOMAP (_AT(pteval_t, 1) << _PAGE_BIT_IOMAP)
56 #define _PAGE_PAT (_AT(pteval_t, 1) << _PAGE_BIT_PAT)
57 #define _PAGE_PAT_LARGE (_AT(pteval_t, 1) << _PAGE_BIT_PAT_LARGE)
58 #define _PAGE_SPECIAL (_AT(pteval_t, 1) << _PAGE_BIT_SPECIAL)
59 #define _PAGE_CPA_TEST (_AT(pteval_t, 1) << _PAGE_BIT_CPA_TEST)
60 #define _PAGE_SPLITTING (_AT(pteval_t, 1) << _PAGE_BIT_SPLITTING)
61 #define __HAVE_ARCH_PTE_SPECIAL
63 #ifdef CONFIG_KMEMCHECK
64 #define _PAGE_HIDDEN (_AT(pteval_t, 1) << _PAGE_BIT_HIDDEN)
66 #define _PAGE_HIDDEN (_AT(pteval_t, 0))
70 * The same hidden bit is used by kmemcheck, but since kmemcheck
71 * works on kernel pages while soft-dirty engine on user space,
72 * they do not conflict with each other.
75 #ifdef CONFIG_MEM_SOFT_DIRTY
76 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 1) << _PAGE_BIT_SOFT_DIRTY)
78 #define _PAGE_SOFT_DIRTY (_AT(pteval_t, 0))
82 * _PAGE_NUMA distinguishes between a numa hinting minor fault and a page
83 * that is not present. The hinting fault gathers numa placement statistics
84 * (see pte_numa()). The bit is always zero when the PTE is not present.
86 * The bit picked must be always zero when the pmd is present and not
87 * present, so that we don't lose information when we set it while
88 * atomically clearing the present bit.
90 #ifdef CONFIG_NUMA_BALANCING
91 #define _PAGE_NUMA (_AT(pteval_t, 1) << _PAGE_BIT_NUMA)
93 #define _PAGE_NUMA (_AT(pteval_t, 0))
97 * Tracking soft dirty bit when a page goes to a swap is tricky.
98 * We need a bit which can be stored in pte _and_ not conflict
99 * with swap entry format. On x86 bits 6 and 7 are *not* involved
100 * into swap entry computation, but bit 6 is used for nonlinear
101 * file mapping, so we borrow bit 7 for soft dirty tracking.
103 * Please note that this bit must be treated as swap dirty page
104 * mark if and only if the PTE has present bit clear!
106 #ifdef CONFIG_MEM_SOFT_DIRTY
107 #define _PAGE_SWP_SOFT_DIRTY _PAGE_PSE
109 #define _PAGE_SWP_SOFT_DIRTY (_AT(pteval_t, 0))
112 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
113 #define _PAGE_NX (_AT(pteval_t, 1) << _PAGE_BIT_NX)
115 #define _PAGE_NX (_AT(pteval_t, 0))
118 #define _PAGE_FILE (_AT(pteval_t, 1) << _PAGE_BIT_FILE)
119 #define _PAGE_PROTNONE (_AT(pteval_t, 1) << _PAGE_BIT_PROTNONE)
121 #define _PAGE_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
122 _PAGE_ACCESSED | _PAGE_DIRTY)
123 #define _KERNPG_TABLE (_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | \
126 /* Set of bits not changed in pte_modify */
127 #define _PAGE_CHG_MASK (PTE_PFN_MASK | _PAGE_PCD | _PAGE_PWT | \
128 _PAGE_SPECIAL | _PAGE_ACCESSED | _PAGE_DIRTY | \
129 _PAGE_SOFT_DIRTY | _PAGE_NUMA)
130 #define _HPAGE_CHG_MASK (_PAGE_CHG_MASK | _PAGE_PSE | _PAGE_NUMA)
132 #define _PAGE_CACHE_MASK (_PAGE_PCD | _PAGE_PWT)
133 #define _PAGE_CACHE_WB (0)
134 #define _PAGE_CACHE_WC (_PAGE_PWT)
135 #define _PAGE_CACHE_UC_MINUS (_PAGE_PCD)
136 #define _PAGE_CACHE_UC (_PAGE_PCD | _PAGE_PWT)
138 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
139 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | \
140 _PAGE_ACCESSED | _PAGE_NX)
142 #define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | \
143 _PAGE_USER | _PAGE_ACCESSED)
144 #define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
145 _PAGE_ACCESSED | _PAGE_NX)
146 #define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
148 #define PAGE_COPY PAGE_COPY_NOEXEC
149 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | \
150 _PAGE_ACCESSED | _PAGE_NX)
151 #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \
154 #define __PAGE_KERNEL_EXEC \
155 (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL)
156 #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX)
158 #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW)
159 #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW)
160 #define __PAGE_KERNEL_EXEC_NOCACHE (__PAGE_KERNEL_EXEC | _PAGE_PCD | _PAGE_PWT)
161 #define __PAGE_KERNEL_WC (__PAGE_KERNEL | _PAGE_CACHE_WC)
162 #define __PAGE_KERNEL_NOCACHE (__PAGE_KERNEL | _PAGE_PCD | _PAGE_PWT)
163 #define __PAGE_KERNEL_UC_MINUS (__PAGE_KERNEL | _PAGE_PCD)
164 #define __PAGE_KERNEL_VSYSCALL (__PAGE_KERNEL_RX | _PAGE_USER)
165 #define __PAGE_KERNEL_VVAR (__PAGE_KERNEL_RO | _PAGE_USER)
166 #define __PAGE_KERNEL_VVAR_NOCACHE (__PAGE_KERNEL_VVAR | _PAGE_PCD | _PAGE_PWT)
167 #define __PAGE_KERNEL_LARGE (__PAGE_KERNEL | _PAGE_PSE)
168 #define __PAGE_KERNEL_LARGE_NOCACHE (__PAGE_KERNEL | _PAGE_CACHE_UC | _PAGE_PSE)
169 #define __PAGE_KERNEL_LARGE_EXEC (__PAGE_KERNEL_EXEC | _PAGE_PSE)
171 #define __PAGE_KERNEL_IO (__PAGE_KERNEL | _PAGE_IOMAP)
172 #define __PAGE_KERNEL_IO_NOCACHE (__PAGE_KERNEL_NOCACHE | _PAGE_IOMAP)
173 #define __PAGE_KERNEL_IO_UC_MINUS (__PAGE_KERNEL_UC_MINUS | _PAGE_IOMAP)
174 #define __PAGE_KERNEL_IO_WC (__PAGE_KERNEL_WC | _PAGE_IOMAP)
176 #define PAGE_KERNEL __pgprot(__PAGE_KERNEL)
177 #define PAGE_KERNEL_RO __pgprot(__PAGE_KERNEL_RO)
178 #define PAGE_KERNEL_EXEC __pgprot(__PAGE_KERNEL_EXEC)
179 #define PAGE_KERNEL_RX __pgprot(__PAGE_KERNEL_RX)
180 #define PAGE_KERNEL_WC __pgprot(__PAGE_KERNEL_WC)
181 #define PAGE_KERNEL_NOCACHE __pgprot(__PAGE_KERNEL_NOCACHE)
182 #define PAGE_KERNEL_UC_MINUS __pgprot(__PAGE_KERNEL_UC_MINUS)
183 #define PAGE_KERNEL_EXEC_NOCACHE __pgprot(__PAGE_KERNEL_EXEC_NOCACHE)
184 #define PAGE_KERNEL_LARGE __pgprot(__PAGE_KERNEL_LARGE)
185 #define PAGE_KERNEL_LARGE_NOCACHE __pgprot(__PAGE_KERNEL_LARGE_NOCACHE)
186 #define PAGE_KERNEL_LARGE_EXEC __pgprot(__PAGE_KERNEL_LARGE_EXEC)
187 #define PAGE_KERNEL_VSYSCALL __pgprot(__PAGE_KERNEL_VSYSCALL)
188 #define PAGE_KERNEL_VVAR __pgprot(__PAGE_KERNEL_VVAR)
189 #define PAGE_KERNEL_VVAR_NOCACHE __pgprot(__PAGE_KERNEL_VVAR_NOCACHE)
191 #define PAGE_KERNEL_IO __pgprot(__PAGE_KERNEL_IO)
192 #define PAGE_KERNEL_IO_NOCACHE __pgprot(__PAGE_KERNEL_IO_NOCACHE)
193 #define PAGE_KERNEL_IO_UC_MINUS __pgprot(__PAGE_KERNEL_IO_UC_MINUS)
194 #define PAGE_KERNEL_IO_WC __pgprot(__PAGE_KERNEL_IO_WC)
197 #define __P000 PAGE_NONE
198 #define __P001 PAGE_READONLY
199 #define __P010 PAGE_COPY
200 #define __P011 PAGE_COPY
201 #define __P100 PAGE_READONLY_EXEC
202 #define __P101 PAGE_READONLY_EXEC
203 #define __P110 PAGE_COPY_EXEC
204 #define __P111 PAGE_COPY_EXEC
206 #define __S000 PAGE_NONE
207 #define __S001 PAGE_READONLY
208 #define __S010 PAGE_SHARED
209 #define __S011 PAGE_SHARED
210 #define __S100 PAGE_READONLY_EXEC
211 #define __S101 PAGE_READONLY_EXEC
212 #define __S110 PAGE_SHARED_EXEC
213 #define __S111 PAGE_SHARED_EXEC
216 * early identity mapping pte attrib macros.
219 #define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
221 #define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
222 #define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
223 #define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
227 # include <asm/pgtable_32_types.h>
229 # include <asm/pgtable_64_types.h>
234 #include <linux/types.h>
236 /* PTE_PFN_MASK extracts the PFN from a (pte|pmd|pud|pgd)val_t */
237 #define PTE_PFN_MASK ((pteval_t)PHYSICAL_PAGE_MASK)
239 /* PTE_FLAGS_MASK extracts the flags from a (pte|pmd|pud|pgd)val_t */
240 #define PTE_FLAGS_MASK (~PTE_PFN_MASK)
242 typedef struct pgprot { pgprotval_t pgprot; } pgprot_t;
244 typedef struct { pgdval_t pgd; } pgd_t;
246 static inline pgd_t native_make_pgd(pgdval_t val)
248 return (pgd_t) { val };
251 static inline pgdval_t native_pgd_val(pgd_t pgd)
256 static inline pgdval_t pgd_flags(pgd_t pgd)
258 return native_pgd_val(pgd) & PTE_FLAGS_MASK;
261 #if PAGETABLE_LEVELS > 3
262 typedef struct { pudval_t pud; } pud_t;
264 static inline pud_t native_make_pud(pmdval_t val)
266 return (pud_t) { val };
269 static inline pudval_t native_pud_val(pud_t pud)
274 #include <asm-generic/pgtable-nopud.h>
276 static inline pudval_t native_pud_val(pud_t pud)
278 return native_pgd_val(pud.pgd);
282 #if PAGETABLE_LEVELS > 2
283 typedef struct { pmdval_t pmd; } pmd_t;
285 static inline pmd_t native_make_pmd(pmdval_t val)
287 return (pmd_t) { val };
290 static inline pmdval_t native_pmd_val(pmd_t pmd)
295 #include <asm-generic/pgtable-nopmd.h>
297 static inline pmdval_t native_pmd_val(pmd_t pmd)
299 return native_pgd_val(pmd.pud.pgd);
303 static inline pudval_t pud_flags(pud_t pud)
305 return native_pud_val(pud) & PTE_FLAGS_MASK;
308 static inline pmdval_t pmd_flags(pmd_t pmd)
310 return native_pmd_val(pmd) & PTE_FLAGS_MASK;
313 static inline pte_t native_make_pte(pteval_t val)
315 return (pte_t) { .pte = val };
318 static inline pteval_t native_pte_val(pte_t pte)
323 static inline pteval_t pte_flags(pte_t pte)
325 return native_pte_val(pte) & PTE_FLAGS_MASK;
328 #ifdef CONFIG_NUMA_BALANCING
329 /* Set of bits that distinguishes present, prot_none and numa ptes */
330 #define _PAGE_NUMA_MASK (_PAGE_NUMA|_PAGE_PROTNONE|_PAGE_PRESENT)
331 static inline pteval_t ptenuma_flags(pte_t pte)
333 return pte_flags(pte) & _PAGE_NUMA_MASK;
336 static inline pmdval_t pmdnuma_flags(pmd_t pmd)
338 return pmd_flags(pmd) & _PAGE_NUMA_MASK;
340 #endif /* CONFIG_NUMA_BALANCING */
342 #define pgprot_val(x) ((x).pgprot)
343 #define __pgprot(x) ((pgprot_t) { (x) } )
346 typedef struct page *pgtable_t;
348 extern pteval_t __supported_pte_mask;
349 extern void set_nx(void);
350 extern int nx_enabled;
352 #define pgprot_writecombine pgprot_writecombine
353 extern pgprot_t pgprot_writecombine(pgprot_t prot);
355 /* Indicate that x86 has its own track and untrack pfn vma functions */
356 #define __HAVE_PFNMAP_TRACKING
358 #define __HAVE_PHYS_MEM_ACCESS_PROT
360 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
361 unsigned long size, pgprot_t vma_prot);
362 int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
363 unsigned long size, pgprot_t *vma_prot);
365 /* Install a pte for a particular vaddr in kernel space. */
366 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
369 extern void native_pagetable_init(void);
371 #define native_pagetable_init paging_init
375 extern void arch_report_meminfo(struct seq_file *m);
385 #ifdef CONFIG_PROC_FS
386 extern void update_page_count(int level, unsigned long pages);
388 static inline void update_page_count(int level, unsigned long pages) { }
392 * Helper function that returns the kernel pagetable entry controlling
393 * the virtual address 'address'. NULL means no pagetable entry present.
394 * NOTE: the return type is pte_t but if the pmd is PSE then we return it
397 extern pte_t *lookup_address(unsigned long address, unsigned int *level);
398 extern pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
399 unsigned int *level);
400 extern phys_addr_t slow_virt_to_phys(void *__address);
401 extern int kernel_map_pages_in_pgd(pgd_t *pgd, u64 pfn, unsigned long address,
402 unsigned numpages, unsigned long page_flags);
403 void kernel_unmap_pages_in_pgd(pgd_t *root, unsigned long address,
405 #endif /* !__ASSEMBLY__ */
407 #endif /* _ASM_X86_PGTABLE_DEFS_H */