xref: /openbmc/linux/arch/x86/include/asm/pgtable_64.h (revision 612a462a)
1 #ifndef _ASM_X86_PGTABLE_64_H
2 #define _ASM_X86_PGTABLE_64_H
3 
4 #include <linux/const.h>
5 #include <asm/pgtable_64_types.h>
6 
7 #ifndef __ASSEMBLY__
8 
9 /*
10  * This file contains the functions and defines necessary to modify and use
11  * the x86-64 page table tree.
12  */
13 #include <asm/processor.h>
14 #include <linux/bitops.h>
15 #include <linux/threads.h>
16 
17 extern p4d_t level4_kernel_pgt[512];
18 extern p4d_t level4_ident_pgt[512];
19 extern pud_t level3_kernel_pgt[512];
20 extern pud_t level3_ident_pgt[512];
21 extern pmd_t level2_kernel_pgt[512];
22 extern pmd_t level2_fixmap_pgt[512];
23 extern pmd_t level2_ident_pgt[512];
24 extern pte_t level1_fixmap_pgt[512];
25 extern pgd_t init_top_pgt[];
26 
27 #define swapper_pg_dir init_top_pgt
28 
29 extern void paging_init(void);
30 
31 #define pte_ERROR(e)					\
32 	pr_err("%s:%d: bad pte %p(%016lx)\n",		\
33 	       __FILE__, __LINE__, &(e), pte_val(e))
34 #define pmd_ERROR(e)					\
35 	pr_err("%s:%d: bad pmd %p(%016lx)\n",		\
36 	       __FILE__, __LINE__, &(e), pmd_val(e))
37 #define pud_ERROR(e)					\
38 	pr_err("%s:%d: bad pud %p(%016lx)\n",		\
39 	       __FILE__, __LINE__, &(e), pud_val(e))
40 
41 #if CONFIG_PGTABLE_LEVELS >= 5
42 #define p4d_ERROR(e)					\
43 	pr_err("%s:%d: bad p4d %p(%016lx)\n",		\
44 	       __FILE__, __LINE__, &(e), p4d_val(e))
45 #endif
46 
47 #define pgd_ERROR(e)					\
48 	pr_err("%s:%d: bad pgd %p(%016lx)\n",		\
49 	       __FILE__, __LINE__, &(e), pgd_val(e))
50 
51 struct mm_struct;
52 
53 void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte);
54 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte);
55 
56 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
57 				    pte_t *ptep)
58 {
59 	*ptep = native_make_pte(0);
60 }
61 
62 static inline void native_set_pte(pte_t *ptep, pte_t pte)
63 {
64 	*ptep = pte;
65 }
66 
67 static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
68 {
69 	native_set_pte(ptep, pte);
70 }
71 
72 static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
73 {
74 	*pmdp = pmd;
75 }
76 
77 static inline void native_pmd_clear(pmd_t *pmd)
78 {
79 	native_set_pmd(pmd, native_make_pmd(0));
80 }
81 
82 static inline pte_t native_ptep_get_and_clear(pte_t *xp)
83 {
84 #ifdef CONFIG_SMP
85 	return native_make_pte(xchg(&xp->pte, 0));
86 #else
87 	/* native_local_ptep_get_and_clear,
88 	   but duplicated because of cyclic dependency */
89 	pte_t ret = *xp;
90 	native_pte_clear(NULL, 0, xp);
91 	return ret;
92 #endif
93 }
94 
95 static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
96 {
97 #ifdef CONFIG_SMP
98 	return native_make_pmd(xchg(&xp->pmd, 0));
99 #else
100 	/* native_local_pmdp_get_and_clear,
101 	   but duplicated because of cyclic dependency */
102 	pmd_t ret = *xp;
103 	native_pmd_clear(xp);
104 	return ret;
105 #endif
106 }
107 
108 static inline void native_set_pud(pud_t *pudp, pud_t pud)
109 {
110 	*pudp = pud;
111 }
112 
113 static inline void native_pud_clear(pud_t *pud)
114 {
115 	native_set_pud(pud, native_make_pud(0));
116 }
117 
118 static inline pud_t native_pudp_get_and_clear(pud_t *xp)
119 {
120 #ifdef CONFIG_SMP
121 	return native_make_pud(xchg(&xp->pud, 0));
122 #else
123 	/* native_local_pudp_get_and_clear,
124 	 * but duplicated because of cyclic dependency
125 	 */
126 	pud_t ret = *xp;
127 
128 	native_pud_clear(xp);
129 	return ret;
130 #endif
131 }
132 
133 static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d)
134 {
135 	*p4dp = p4d;
136 }
137 
138 static inline void native_p4d_clear(p4d_t *p4d)
139 {
140 #ifdef CONFIG_X86_5LEVEL
141 	native_set_p4d(p4d, native_make_p4d(0));
142 #else
143 	native_set_p4d(p4d, (p4d_t) { .pgd = native_make_pgd(0)});
144 #endif
145 }
146 
147 static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd)
148 {
149 	*pgdp = pgd;
150 }
151 
152 static inline void native_pgd_clear(pgd_t *pgd)
153 {
154 	native_set_pgd(pgd, native_make_pgd(0));
155 }
156 
157 extern void sync_global_pgds(unsigned long start, unsigned long end);
158 
159 /*
160  * Conversion functions: convert a page and protection to a page entry,
161  * and a page entry and page directory to the page they refer to.
162  */
163 
164 /*
165  * Level 4 access.
166  */
167 static inline int pgd_large(pgd_t pgd) { return 0; }
168 #define mk_kernel_pgd(address) __pgd((address) | _KERNPG_TABLE)
169 
170 /* PUD - Level3 access */
171 
172 /* PMD  - Level 2 access */
173 
174 /* PTE - Level 1 access. */
175 
176 /* x86-64 always has all page tables mapped. */
177 #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address))
178 #define pte_unmap(pte) ((void)(pte))/* NOP */
179 
180 /*
181  * Encode and de-code a swap entry
182  *
183  * |     ...            | 11| 10|  9|8|7|6|5| 4| 3|2| 1|0| <- bit number
184  * |     ...            |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names
185  * | OFFSET (14->63) | TYPE (9-13)  |0|0|X|X| X| X|X|SD|0| <- swp entry
186  *
187  * G (8) is aliased and used as a PROT_NONE indicator for
188  * !present ptes.  We need to start storing swap entries above
189  * there.  We also need to avoid using A and D because of an
190  * erratum where they can be incorrectly set by hardware on
191  * non-present PTEs.
192  *
193  * SD (1) in swp entry is used to store soft dirty bit, which helps us
194  * remember soft dirty over page migration
195  *
196  * Bit 7 in swp entry should be 0 because pmd_present checks not only P,
197  * but also L and G.
198  */
199 #define SWP_TYPE_FIRST_BIT (_PAGE_BIT_PROTNONE + 1)
200 #define SWP_TYPE_BITS 5
201 /* Place the offset above the type: */
202 #define SWP_OFFSET_FIRST_BIT (SWP_TYPE_FIRST_BIT + SWP_TYPE_BITS)
203 
204 #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
205 
206 #define __swp_type(x)			(((x).val >> (SWP_TYPE_FIRST_BIT)) \
207 					 & ((1U << SWP_TYPE_BITS) - 1))
208 #define __swp_offset(x)			((x).val >> SWP_OFFSET_FIRST_BIT)
209 #define __swp_entry(type, offset)	((swp_entry_t) { \
210 					 ((type) << (SWP_TYPE_FIRST_BIT)) \
211 					 | ((offset) << SWP_OFFSET_FIRST_BIT) })
212 #define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val((pte)) })
213 #define __pmd_to_swp_entry(pmd)		((swp_entry_t) { pmd_val((pmd)) })
214 #define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })
215 #define __swp_entry_to_pmd(x)		((pmd_t) { .pmd = (x).val })
216 
217 extern int kern_addr_valid(unsigned long addr);
218 extern void cleanup_highmap(void);
219 
220 #define HAVE_ARCH_UNMAPPED_AREA
221 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
222 
223 #define pgtable_cache_init()   do { } while (0)
224 #define check_pgt_cache()      do { } while (0)
225 
226 #define PAGE_AGP    PAGE_KERNEL_NOCACHE
227 #define HAVE_PAGE_AGP 1
228 
229 /* fs/proc/kcore.c */
230 #define	kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
231 #define	kc_offset_to_vaddr(o) ((o) | ~__VIRTUAL_MASK)
232 
233 #define __HAVE_ARCH_PTE_SAME
234 
235 #define vmemmap ((struct page *)VMEMMAP_START)
236 
237 extern void init_extra_mapping_uc(unsigned long phys, unsigned long size);
238 extern void init_extra_mapping_wb(unsigned long phys, unsigned long size);
239 
240 #define gup_fast_permitted gup_fast_permitted
241 static inline bool gup_fast_permitted(unsigned long start, int nr_pages,
242 		int write)
243 {
244 	unsigned long len, end;
245 
246 	len = (unsigned long)nr_pages << PAGE_SHIFT;
247 	end = start + len;
248 	if (end < start)
249 		return false;
250 	if (end >> __VIRTUAL_MASK_SHIFT)
251 		return false;
252 	return true;
253 }
254 
255 #endif /* !__ASSEMBLY__ */
256 #endif /* _ASM_X86_PGTABLE_64_H */
257