xref: /linux/arch/riscv/include/asm/pgtable.h (revision d642ef71)
1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2012 Regents of the University of California
4  */
5 
6 #ifndef _ASM_RISCV_PGTABLE_H
7 #define _ASM_RISCV_PGTABLE_H
8 
9 #include <linux/mmzone.h>
10 #include <linux/sizes.h>
11 
12 #include <asm/pgtable-bits.h>
13 
14 #ifndef CONFIG_MMU
15 #define KERNEL_LINK_ADDR	PAGE_OFFSET
16 #define KERN_VIRT_SIZE		(UL(-1))
17 #else
18 
19 #define ADDRESS_SPACE_END	(UL(-1))
20 
21 #ifdef CONFIG_64BIT
22 /* Leave 2GB for kernel and BPF at the end of the address space */
23 #define KERNEL_LINK_ADDR	(ADDRESS_SPACE_END - SZ_2G + 1)
24 #else
25 #define KERNEL_LINK_ADDR	PAGE_OFFSET
26 #endif
27 
28 /* Number of entries in the page global directory */
29 #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
30 /* Number of entries in the page table */
31 #define PTRS_PER_PTE    (PAGE_SIZE / sizeof(pte_t))
32 
33 /*
34  * Half of the kernel address space (1/4 of the entries of the page global
35  * directory) is for the direct mapping.
36  */
37 #define KERN_VIRT_SIZE          ((PTRS_PER_PGD / 2 * PGDIR_SIZE) / 2)
38 
39 #define VMALLOC_SIZE     (KERN_VIRT_SIZE >> 1)
40 #define VMALLOC_END      PAGE_OFFSET
41 #define VMALLOC_START    (PAGE_OFFSET - VMALLOC_SIZE)
42 
43 #define BPF_JIT_REGION_SIZE	(SZ_128M)
44 #ifdef CONFIG_64BIT
45 #define BPF_JIT_REGION_START	(BPF_JIT_REGION_END - BPF_JIT_REGION_SIZE)
46 #define BPF_JIT_REGION_END	(MODULES_END)
47 #else
48 #define BPF_JIT_REGION_START	(PAGE_OFFSET - BPF_JIT_REGION_SIZE)
49 #define BPF_JIT_REGION_END	(VMALLOC_END)
50 #endif
51 
52 /* Modules always live before the kernel */
53 #ifdef CONFIG_64BIT
54 /* This is used to define the end of the KASAN shadow region */
55 #define MODULES_LOWEST_VADDR	(KERNEL_LINK_ADDR - SZ_2G)
56 #define MODULES_VADDR		(PFN_ALIGN((unsigned long)&_end) - SZ_2G)
57 #define MODULES_END		(PFN_ALIGN((unsigned long)&_start))
58 #endif
59 
60 /*
61  * Roughly size the vmemmap space to be large enough to fit enough
62  * struct pages to map half the virtual address space. Then
63  * position vmemmap directly below the VMALLOC region.
64  */
65 #define VA_BITS_SV32 32
66 #ifdef CONFIG_64BIT
67 #define VA_BITS_SV39 39
68 #define VA_BITS_SV48 48
69 #define VA_BITS_SV57 57
70 
71 #define VA_BITS		(pgtable_l5_enabled ? \
72 				VA_BITS_SV57 : (pgtable_l4_enabled ? VA_BITS_SV48 : VA_BITS_SV39))
73 #else
74 #define VA_BITS		VA_BITS_SV32
75 #endif
76 
77 #define VMEMMAP_SHIFT \
78 	(VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)
79 #define VMEMMAP_SIZE	BIT(VMEMMAP_SHIFT)
80 #define VMEMMAP_END	VMALLOC_START
81 #define VMEMMAP_START	(VMALLOC_START - VMEMMAP_SIZE)
82 
83 /*
84  * Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel
85  * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
86  */
87 #define vmemmap		((struct page *)VMEMMAP_START)
88 
89 #define PCI_IO_SIZE      SZ_16M
90 #define PCI_IO_END       VMEMMAP_START
91 #define PCI_IO_START     (PCI_IO_END - PCI_IO_SIZE)
92 
93 #define FIXADDR_TOP      PCI_IO_START
94 #ifdef CONFIG_64BIT
95 #define MAX_FDT_SIZE	 PMD_SIZE
96 #define FIX_FDT_SIZE	 (MAX_FDT_SIZE + SZ_2M)
97 #define FIXADDR_SIZE     (PMD_SIZE + FIX_FDT_SIZE)
98 #else
99 #define MAX_FDT_SIZE	 PGDIR_SIZE
100 #define FIX_FDT_SIZE	 MAX_FDT_SIZE
101 #define FIXADDR_SIZE     (PGDIR_SIZE + FIX_FDT_SIZE)
102 #endif
103 #define FIXADDR_START    (FIXADDR_TOP - FIXADDR_SIZE)
104 
105 #endif
106 
107 #ifdef CONFIG_XIP_KERNEL
108 #define XIP_OFFSET		SZ_32M
109 #define XIP_OFFSET_MASK		(SZ_32M - 1)
110 #else
111 #define XIP_OFFSET		0
112 #endif
113 
114 #ifndef __ASSEMBLY__
115 
116 #include <asm/page.h>
117 #include <asm/tlbflush.h>
118 #include <linux/mm_types.h>
119 #include <asm/compat.h>
120 
121 #define __page_val_to_pfn(_val)  (((_val) & _PAGE_PFN_MASK) >> _PAGE_PFN_SHIFT)
122 
123 #ifdef CONFIG_64BIT
124 #include <asm/pgtable-64.h>
125 
126 #define VA_USER_SV39 (UL(1) << (VA_BITS_SV39 - 1))
127 #define VA_USER_SV48 (UL(1) << (VA_BITS_SV48 - 1))
128 #define VA_USER_SV57 (UL(1) << (VA_BITS_SV57 - 1))
129 
130 #ifdef CONFIG_COMPAT
131 #define MMAP_VA_BITS_64 ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS)
132 #define MMAP_MIN_VA_BITS_64 (VA_BITS_SV39)
133 #define MMAP_VA_BITS (is_compat_task() ? VA_BITS_SV32 : MMAP_VA_BITS_64)
134 #define MMAP_MIN_VA_BITS (is_compat_task() ? VA_BITS_SV32 : MMAP_MIN_VA_BITS_64)
135 #else
136 #define MMAP_VA_BITS ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS)
137 #define MMAP_MIN_VA_BITS (VA_BITS_SV39)
138 #endif /* CONFIG_COMPAT */
139 
140 #else
141 #include <asm/pgtable-32.h>
142 #endif /* CONFIG_64BIT */
143 
144 #include <linux/page_table_check.h>
145 
146 #ifdef CONFIG_XIP_KERNEL
147 #define XIP_FIXUP(addr) ({							\
148 	uintptr_t __a = (uintptr_t)(addr);					\
149 	(__a >= CONFIG_XIP_PHYS_ADDR && \
150 	 __a < CONFIG_XIP_PHYS_ADDR + XIP_OFFSET * 2) ?	\
151 		__a - CONFIG_XIP_PHYS_ADDR + CONFIG_PHYS_RAM_BASE - XIP_OFFSET :\
152 		__a;								\
153 	})
154 #else
155 #define XIP_FIXUP(addr)		(addr)
156 #endif /* CONFIG_XIP_KERNEL */
157 
158 struct pt_alloc_ops {
159 	pte_t *(*get_pte_virt)(phys_addr_t pa);
160 	phys_addr_t (*alloc_pte)(uintptr_t va);
161 #ifndef __PAGETABLE_PMD_FOLDED
162 	pmd_t *(*get_pmd_virt)(phys_addr_t pa);
163 	phys_addr_t (*alloc_pmd)(uintptr_t va);
164 	pud_t *(*get_pud_virt)(phys_addr_t pa);
165 	phys_addr_t (*alloc_pud)(uintptr_t va);
166 	p4d_t *(*get_p4d_virt)(phys_addr_t pa);
167 	phys_addr_t (*alloc_p4d)(uintptr_t va);
168 #endif
169 };
170 
171 extern struct pt_alloc_ops pt_ops __initdata;
172 
173 #ifdef CONFIG_MMU
174 /* Number of PGD entries that a user-mode program can use */
175 #define USER_PTRS_PER_PGD   (TASK_SIZE / PGDIR_SIZE)
176 
177 /* Page protection bits */
178 #define _PAGE_BASE	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER)
179 
180 #define PAGE_NONE		__pgprot(_PAGE_PROT_NONE | _PAGE_READ)
181 #define PAGE_READ		__pgprot(_PAGE_BASE | _PAGE_READ)
182 #define PAGE_WRITE		__pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_WRITE)
183 #define PAGE_EXEC		__pgprot(_PAGE_BASE | _PAGE_EXEC)
184 #define PAGE_READ_EXEC		__pgprot(_PAGE_BASE | _PAGE_READ | _PAGE_EXEC)
185 #define PAGE_WRITE_EXEC		__pgprot(_PAGE_BASE | _PAGE_READ |	\
186 					 _PAGE_EXEC | _PAGE_WRITE)
187 
188 #define PAGE_COPY		PAGE_READ
189 #define PAGE_COPY_EXEC		PAGE_READ_EXEC
190 #define PAGE_SHARED		PAGE_WRITE
191 #define PAGE_SHARED_EXEC	PAGE_WRITE_EXEC
192 
193 #define _PAGE_KERNEL		(_PAGE_READ \
194 				| _PAGE_WRITE \
195 				| _PAGE_PRESENT \
196 				| _PAGE_ACCESSED \
197 				| _PAGE_DIRTY \
198 				| _PAGE_GLOBAL)
199 
200 #define PAGE_KERNEL		__pgprot(_PAGE_KERNEL)
201 #define PAGE_KERNEL_READ	__pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)
202 #define PAGE_KERNEL_EXEC	__pgprot(_PAGE_KERNEL | _PAGE_EXEC)
203 #define PAGE_KERNEL_READ_EXEC	__pgprot((_PAGE_KERNEL & ~_PAGE_WRITE) \
204 					 | _PAGE_EXEC)
205 
206 #define PAGE_TABLE		__pgprot(_PAGE_TABLE)
207 
208 #define _PAGE_IOREMAP	((_PAGE_KERNEL & ~_PAGE_MTMASK) | _PAGE_IO)
209 #define PAGE_KERNEL_IO		__pgprot(_PAGE_IOREMAP)
210 
211 extern pgd_t swapper_pg_dir[];
212 extern pgd_t trampoline_pg_dir[];
213 extern pgd_t early_pg_dir[];
214 
215 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
216 static inline int pmd_present(pmd_t pmd)
217 {
218 	/*
219 	 * Checking for _PAGE_LEAF is needed too because:
220 	 * When splitting a THP, split_huge_page() will temporarily clear
221 	 * the present bit, in this situation, pmd_present() and
222 	 * pmd_trans_huge() still needs to return true.
223 	 */
224 	return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE | _PAGE_LEAF));
225 }
226 #else
227 static inline int pmd_present(pmd_t pmd)
228 {
229 	return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
230 }
231 #endif
232 
233 static inline int pmd_none(pmd_t pmd)
234 {
235 	return (pmd_val(pmd) == 0);
236 }
237 
238 static inline int pmd_bad(pmd_t pmd)
239 {
240 	return !pmd_present(pmd) || (pmd_val(pmd) & _PAGE_LEAF);
241 }
242 
243 #define pmd_leaf	pmd_leaf
244 static inline int pmd_leaf(pmd_t pmd)
245 {
246 	return pmd_present(pmd) && (pmd_val(pmd) & _PAGE_LEAF);
247 }
248 
249 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
250 {
251 	*pmdp = pmd;
252 }
253 
254 static inline void pmd_clear(pmd_t *pmdp)
255 {
256 	set_pmd(pmdp, __pmd(0));
257 }
258 
259 static inline pgd_t pfn_pgd(unsigned long pfn, pgprot_t prot)
260 {
261 	unsigned long prot_val = pgprot_val(prot);
262 
263 	ALT_THEAD_PMA(prot_val);
264 
265 	return __pgd((pfn << _PAGE_PFN_SHIFT) | prot_val);
266 }
267 
268 static inline unsigned long _pgd_pfn(pgd_t pgd)
269 {
270 	return __page_val_to_pfn(pgd_val(pgd));
271 }
272 
273 static inline struct page *pmd_page(pmd_t pmd)
274 {
275 	return pfn_to_page(__page_val_to_pfn(pmd_val(pmd)));
276 }
277 
278 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
279 {
280 	return (unsigned long)pfn_to_virt(__page_val_to_pfn(pmd_val(pmd)));
281 }
282 
283 static inline pte_t pmd_pte(pmd_t pmd)
284 {
285 	return __pte(pmd_val(pmd));
286 }
287 
288 static inline pte_t pud_pte(pud_t pud)
289 {
290 	return __pte(pud_val(pud));
291 }
292 
293 #ifdef CONFIG_RISCV_ISA_SVNAPOT
294 #include <asm/cpufeature.h>
295 
296 static __always_inline bool has_svnapot(void)
297 {
298 	return riscv_has_extension_likely(RISCV_ISA_EXT_SVNAPOT);
299 }
300 
301 static inline unsigned long pte_napot(pte_t pte)
302 {
303 	return pte_val(pte) & _PAGE_NAPOT;
304 }
305 
306 static inline pte_t pte_mknapot(pte_t pte, unsigned int order)
307 {
308 	int pos = order - 1 + _PAGE_PFN_SHIFT;
309 	unsigned long napot_bit = BIT(pos);
310 	unsigned long napot_mask = ~GENMASK(pos, _PAGE_PFN_SHIFT);
311 
312 	return __pte((pte_val(pte) & napot_mask) | napot_bit | _PAGE_NAPOT);
313 }
314 
315 #else
316 
317 static __always_inline bool has_svnapot(void) { return false; }
318 
319 static inline unsigned long pte_napot(pte_t pte)
320 {
321 	return 0;
322 }
323 
324 #endif /* CONFIG_RISCV_ISA_SVNAPOT */
325 
326 /* Yields the page frame number (PFN) of a page table entry */
327 static inline unsigned long pte_pfn(pte_t pte)
328 {
329 	unsigned long res  = __page_val_to_pfn(pte_val(pte));
330 
331 	if (has_svnapot() && pte_napot(pte))
332 		res = res & (res - 1UL);
333 
334 	return res;
335 }
336 
337 #define pte_page(x)     pfn_to_page(pte_pfn(x))
338 
339 /* Constructs a page table entry */
340 static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot)
341 {
342 	unsigned long prot_val = pgprot_val(prot);
343 
344 	ALT_THEAD_PMA(prot_val);
345 
346 	return __pte((pfn << _PAGE_PFN_SHIFT) | prot_val);
347 }
348 
349 #define mk_pte(page, prot)       pfn_pte(page_to_pfn(page), prot)
350 
351 static inline int pte_present(pte_t pte)
352 {
353 	return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
354 }
355 
356 static inline int pte_none(pte_t pte)
357 {
358 	return (pte_val(pte) == 0);
359 }
360 
361 static inline int pte_write(pte_t pte)
362 {
363 	return pte_val(pte) & _PAGE_WRITE;
364 }
365 
366 static inline int pte_exec(pte_t pte)
367 {
368 	return pte_val(pte) & _PAGE_EXEC;
369 }
370 
371 static inline int pte_user(pte_t pte)
372 {
373 	return pte_val(pte) & _PAGE_USER;
374 }
375 
376 static inline int pte_huge(pte_t pte)
377 {
378 	return pte_present(pte) && (pte_val(pte) & _PAGE_LEAF);
379 }
380 
381 static inline int pte_dirty(pte_t pte)
382 {
383 	return pte_val(pte) & _PAGE_DIRTY;
384 }
385 
386 static inline int pte_young(pte_t pte)
387 {
388 	return pte_val(pte) & _PAGE_ACCESSED;
389 }
390 
391 static inline int pte_special(pte_t pte)
392 {
393 	return pte_val(pte) & _PAGE_SPECIAL;
394 }
395 
396 /* static inline pte_t pte_rdprotect(pte_t pte) */
397 
398 static inline pte_t pte_wrprotect(pte_t pte)
399 {
400 	return __pte(pte_val(pte) & ~(_PAGE_WRITE));
401 }
402 
403 /* static inline pte_t pte_mkread(pte_t pte) */
404 
405 static inline pte_t pte_mkwrite_novma(pte_t pte)
406 {
407 	return __pte(pte_val(pte) | _PAGE_WRITE);
408 }
409 
410 /* static inline pte_t pte_mkexec(pte_t pte) */
411 
412 static inline pte_t pte_mkdirty(pte_t pte)
413 {
414 	return __pte(pte_val(pte) | _PAGE_DIRTY);
415 }
416 
417 static inline pte_t pte_mkclean(pte_t pte)
418 {
419 	return __pte(pte_val(pte) & ~(_PAGE_DIRTY));
420 }
421 
422 static inline pte_t pte_mkyoung(pte_t pte)
423 {
424 	return __pte(pte_val(pte) | _PAGE_ACCESSED);
425 }
426 
427 static inline pte_t pte_mkold(pte_t pte)
428 {
429 	return __pte(pte_val(pte) & ~(_PAGE_ACCESSED));
430 }
431 
432 static inline pte_t pte_mkspecial(pte_t pte)
433 {
434 	return __pte(pte_val(pte) | _PAGE_SPECIAL);
435 }
436 
437 static inline pte_t pte_mkhuge(pte_t pte)
438 {
439 	return pte;
440 }
441 
442 #ifdef CONFIG_NUMA_BALANCING
443 /*
444  * See the comment in include/asm-generic/pgtable.h
445  */
446 static inline int pte_protnone(pte_t pte)
447 {
448 	return (pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROT_NONE)) == _PAGE_PROT_NONE;
449 }
450 
451 static inline int pmd_protnone(pmd_t pmd)
452 {
453 	return pte_protnone(pmd_pte(pmd));
454 }
455 #endif
456 
457 /* Modify page protection bits */
458 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
459 {
460 	unsigned long newprot_val = pgprot_val(newprot);
461 
462 	ALT_THEAD_PMA(newprot_val);
463 
464 	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | newprot_val);
465 }
466 
467 #define pgd_ERROR(e) \
468 	pr_err("%s:%d: bad pgd " PTE_FMT ".\n", __FILE__, __LINE__, pgd_val(e))
469 
470 
471 /* Commit new configuration to MMU hardware */
472 static inline void update_mmu_cache_range(struct vm_fault *vmf,
473 		struct vm_area_struct *vma, unsigned long address,
474 		pte_t *ptep, unsigned int nr)
475 {
476 	/*
477 	 * The kernel assumes that TLBs don't cache invalid entries, but
478 	 * in RISC-V, SFENCE.VMA specifies an ordering constraint, not a
479 	 * cache flush; it is necessary even after writing invalid entries.
480 	 * Relying on flush_tlb_fix_spurious_fault would suffice, but
481 	 * the extra traps reduce performance.  So, eagerly SFENCE.VMA.
482 	 */
483 	while (nr--)
484 		local_flush_tlb_page(address + nr * PAGE_SIZE);
485 }
486 #define update_mmu_cache(vma, addr, ptep) \
487 	update_mmu_cache_range(NULL, vma, addr, ptep, 1)
488 
489 #define __HAVE_ARCH_UPDATE_MMU_TLB
490 #define update_mmu_tlb update_mmu_cache
491 
492 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
493 		unsigned long address, pmd_t *pmdp)
494 {
495 	pte_t *ptep = (pte_t *)pmdp;
496 
497 	update_mmu_cache(vma, address, ptep);
498 }
499 
500 #define __HAVE_ARCH_PTE_SAME
501 static inline int pte_same(pte_t pte_a, pte_t pte_b)
502 {
503 	return pte_val(pte_a) == pte_val(pte_b);
504 }
505 
506 /*
507  * Certain architectures need to do special things when PTEs within
508  * a page table are directly modified.  Thus, the following hook is
509  * made available.
510  */
511 static inline void set_pte(pte_t *ptep, pte_t pteval)
512 {
513 	*ptep = pteval;
514 }
515 
516 void flush_icache_pte(pte_t pte);
517 
518 static inline void __set_pte_at(pte_t *ptep, pte_t pteval)
519 {
520 	if (pte_present(pteval) && pte_exec(pteval))
521 		flush_icache_pte(pteval);
522 
523 	set_pte(ptep, pteval);
524 }
525 
526 static inline void set_ptes(struct mm_struct *mm, unsigned long addr,
527 		pte_t *ptep, pte_t pteval, unsigned int nr)
528 {
529 	page_table_check_ptes_set(mm, ptep, pteval, nr);
530 
531 	for (;;) {
532 		__set_pte_at(ptep, pteval);
533 		if (--nr == 0)
534 			break;
535 		ptep++;
536 		pte_val(pteval) += 1 << _PAGE_PFN_SHIFT;
537 	}
538 }
539 #define set_ptes set_ptes
540 
541 static inline void pte_clear(struct mm_struct *mm,
542 	unsigned long addr, pte_t *ptep)
543 {
544 	__set_pte_at(ptep, __pte(0));
545 }
546 
547 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
548 static inline int ptep_set_access_flags(struct vm_area_struct *vma,
549 					unsigned long address, pte_t *ptep,
550 					pte_t entry, int dirty)
551 {
552 	if (!pte_same(*ptep, entry))
553 		__set_pte_at(ptep, entry);
554 	/*
555 	 * update_mmu_cache will unconditionally execute, handling both
556 	 * the case that the PTE changed and the spurious fault case.
557 	 */
558 	return true;
559 }
560 
561 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
562 static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
563 				       unsigned long address, pte_t *ptep)
564 {
565 	pte_t pte = __pte(atomic_long_xchg((atomic_long_t *)ptep, 0));
566 
567 	page_table_check_pte_clear(mm, pte);
568 
569 	return pte;
570 }
571 
572 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
573 static inline int ptep_test_and_clear_young(struct vm_area_struct *vma,
574 					    unsigned long address,
575 					    pte_t *ptep)
576 {
577 	if (!pte_young(*ptep))
578 		return 0;
579 	return test_and_clear_bit(_PAGE_ACCESSED_OFFSET, &pte_val(*ptep));
580 }
581 
582 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
583 static inline void ptep_set_wrprotect(struct mm_struct *mm,
584 				      unsigned long address, pte_t *ptep)
585 {
586 	atomic_long_and(~(unsigned long)_PAGE_WRITE, (atomic_long_t *)ptep);
587 }
588 
589 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
590 static inline int ptep_clear_flush_young(struct vm_area_struct *vma,
591 					 unsigned long address, pte_t *ptep)
592 {
593 	/*
594 	 * This comment is borrowed from x86, but applies equally to RISC-V:
595 	 *
596 	 * Clearing the accessed bit without a TLB flush
597 	 * doesn't cause data corruption. [ It could cause incorrect
598 	 * page aging and the (mistaken) reclaim of hot pages, but the
599 	 * chance of that should be relatively low. ]
600 	 *
601 	 * So as a performance optimization don't flush the TLB when
602 	 * clearing the accessed bit, it will eventually be flushed by
603 	 * a context switch or a VM operation anyway. [ In the rare
604 	 * event of it not getting flushed for a long time the delay
605 	 * shouldn't really matter because there's no real memory
606 	 * pressure for swapout to react to. ]
607 	 */
608 	return ptep_test_and_clear_young(vma, address, ptep);
609 }
610 
611 #define pgprot_noncached pgprot_noncached
612 static inline pgprot_t pgprot_noncached(pgprot_t _prot)
613 {
614 	unsigned long prot = pgprot_val(_prot);
615 
616 	prot &= ~_PAGE_MTMASK;
617 	prot |= _PAGE_IO;
618 
619 	return __pgprot(prot);
620 }
621 
622 #define pgprot_writecombine pgprot_writecombine
623 static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
624 {
625 	unsigned long prot = pgprot_val(_prot);
626 
627 	prot &= ~_PAGE_MTMASK;
628 	prot |= _PAGE_NOCACHE;
629 
630 	return __pgprot(prot);
631 }
632 
633 /*
634  * THP functions
635  */
636 static inline pmd_t pte_pmd(pte_t pte)
637 {
638 	return __pmd(pte_val(pte));
639 }
640 
641 static inline pmd_t pmd_mkhuge(pmd_t pmd)
642 {
643 	return pmd;
644 }
645 
646 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
647 {
648 	return __pmd(pmd_val(pmd) & ~(_PAGE_PRESENT|_PAGE_PROT_NONE));
649 }
650 
651 #define __pmd_to_phys(pmd)  (__page_val_to_pfn(pmd_val(pmd)) << PAGE_SHIFT)
652 
653 static inline unsigned long pmd_pfn(pmd_t pmd)
654 {
655 	return ((__pmd_to_phys(pmd) & PMD_MASK) >> PAGE_SHIFT);
656 }
657 
658 #define __pud_to_phys(pud)  (__page_val_to_pfn(pud_val(pud)) << PAGE_SHIFT)
659 
660 static inline unsigned long pud_pfn(pud_t pud)
661 {
662 	return ((__pud_to_phys(pud) & PUD_MASK) >> PAGE_SHIFT);
663 }
664 
665 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
666 {
667 	return pte_pmd(pte_modify(pmd_pte(pmd), newprot));
668 }
669 
670 #define pmd_write pmd_write
671 static inline int pmd_write(pmd_t pmd)
672 {
673 	return pte_write(pmd_pte(pmd));
674 }
675 
676 static inline int pmd_dirty(pmd_t pmd)
677 {
678 	return pte_dirty(pmd_pte(pmd));
679 }
680 
681 #define pmd_young pmd_young
682 static inline int pmd_young(pmd_t pmd)
683 {
684 	return pte_young(pmd_pte(pmd));
685 }
686 
687 static inline int pmd_user(pmd_t pmd)
688 {
689 	return pte_user(pmd_pte(pmd));
690 }
691 
692 static inline pmd_t pmd_mkold(pmd_t pmd)
693 {
694 	return pte_pmd(pte_mkold(pmd_pte(pmd)));
695 }
696 
697 static inline pmd_t pmd_mkyoung(pmd_t pmd)
698 {
699 	return pte_pmd(pte_mkyoung(pmd_pte(pmd)));
700 }
701 
702 static inline pmd_t pmd_mkwrite_novma(pmd_t pmd)
703 {
704 	return pte_pmd(pte_mkwrite_novma(pmd_pte(pmd)));
705 }
706 
707 static inline pmd_t pmd_wrprotect(pmd_t pmd)
708 {
709 	return pte_pmd(pte_wrprotect(pmd_pte(pmd)));
710 }
711 
712 static inline pmd_t pmd_mkclean(pmd_t pmd)
713 {
714 	return pte_pmd(pte_mkclean(pmd_pte(pmd)));
715 }
716 
717 static inline pmd_t pmd_mkdirty(pmd_t pmd)
718 {
719 	return pte_pmd(pte_mkdirty(pmd_pte(pmd)));
720 }
721 
722 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
723 				pmd_t *pmdp, pmd_t pmd)
724 {
725 	page_table_check_pmd_set(mm, pmdp, pmd);
726 	return __set_pte_at((pte_t *)pmdp, pmd_pte(pmd));
727 }
728 
729 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
730 				pud_t *pudp, pud_t pud)
731 {
732 	page_table_check_pud_set(mm, pudp, pud);
733 	return __set_pte_at((pte_t *)pudp, pud_pte(pud));
734 }
735 
736 #ifdef CONFIG_PAGE_TABLE_CHECK
737 static inline bool pte_user_accessible_page(pte_t pte)
738 {
739 	return pte_present(pte) && pte_user(pte);
740 }
741 
742 static inline bool pmd_user_accessible_page(pmd_t pmd)
743 {
744 	return pmd_leaf(pmd) && pmd_user(pmd);
745 }
746 
747 static inline bool pud_user_accessible_page(pud_t pud)
748 {
749 	return pud_leaf(pud) && pud_user(pud);
750 }
751 #endif
752 
753 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
754 static inline int pmd_trans_huge(pmd_t pmd)
755 {
756 	return pmd_leaf(pmd);
757 }
758 
759 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
760 static inline int pmdp_set_access_flags(struct vm_area_struct *vma,
761 					unsigned long address, pmd_t *pmdp,
762 					pmd_t entry, int dirty)
763 {
764 	return ptep_set_access_flags(vma, address, (pte_t *)pmdp, pmd_pte(entry), dirty);
765 }
766 
767 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
768 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
769 					unsigned long address, pmd_t *pmdp)
770 {
771 	return ptep_test_and_clear_young(vma, address, (pte_t *)pmdp);
772 }
773 
774 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
775 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm,
776 					unsigned long address, pmd_t *pmdp)
777 {
778 	pmd_t pmd = __pmd(atomic_long_xchg((atomic_long_t *)pmdp, 0));
779 
780 	page_table_check_pmd_clear(mm, pmd);
781 
782 	return pmd;
783 }
784 
785 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
786 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
787 					unsigned long address, pmd_t *pmdp)
788 {
789 	ptep_set_wrprotect(mm, address, (pte_t *)pmdp);
790 }
791 
792 #define pmdp_establish pmdp_establish
793 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
794 				unsigned long address, pmd_t *pmdp, pmd_t pmd)
795 {
796 	page_table_check_pmd_set(vma->vm_mm, pmdp, pmd);
797 	return __pmd(atomic_long_xchg((atomic_long_t *)pmdp, pmd_val(pmd)));
798 }
799 
800 #define pmdp_collapse_flush pmdp_collapse_flush
801 extern pmd_t pmdp_collapse_flush(struct vm_area_struct *vma,
802 				 unsigned long address, pmd_t *pmdp);
803 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
804 
805 /*
806  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
807  * are !pte_none() && !pte_present().
808  *
809  * Format of swap PTE:
810  *	bit            0:	_PAGE_PRESENT (zero)
811  *	bit       1 to 3:       _PAGE_LEAF (zero)
812  *	bit            5:	_PAGE_PROT_NONE (zero)
813  *	bit            6:	exclusive marker
814  *	bits      7 to 11:	swap type
815  *	bits 12 to XLEN-1:	swap offset
816  */
817 #define __SWP_TYPE_SHIFT	7
818 #define __SWP_TYPE_BITS		5
819 #define __SWP_TYPE_MASK		((1UL << __SWP_TYPE_BITS) - 1)
820 #define __SWP_OFFSET_SHIFT	(__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
821 
822 #define MAX_SWAPFILES_CHECK()	\
823 	BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
824 
825 #define __swp_type(x)	(((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
826 #define __swp_offset(x)	((x).val >> __SWP_OFFSET_SHIFT)
827 #define __swp_entry(type, offset) ((swp_entry_t) \
828 	{ (((type) & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | \
829 	  ((offset) << __SWP_OFFSET_SHIFT) })
830 
831 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
832 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
833 
834 static inline int pte_swp_exclusive(pte_t pte)
835 {
836 	return pte_val(pte) & _PAGE_SWP_EXCLUSIVE;
837 }
838 
839 static inline pte_t pte_swp_mkexclusive(pte_t pte)
840 {
841 	return __pte(pte_val(pte) | _PAGE_SWP_EXCLUSIVE);
842 }
843 
844 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
845 {
846 	return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE);
847 }
848 
849 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
850 #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) })
851 #define __swp_entry_to_pmd(swp) __pmd((swp).val)
852 #endif /* CONFIG_ARCH_ENABLE_THP_MIGRATION */
853 
854 /*
855  * In the RV64 Linux scheme, we give the user half of the virtual-address space
856  * and give the kernel the other (upper) half.
857  */
858 #ifdef CONFIG_64BIT
859 #define KERN_VIRT_START	(-(BIT(VA_BITS)) + TASK_SIZE)
860 #else
861 #define KERN_VIRT_START	FIXADDR_START
862 #endif
863 
864 /*
865  * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32.
866  * Note that PGDIR_SIZE must evenly divide TASK_SIZE.
867  * Task size is:
868  * -        0x9fc00000	(~2.5GB) for RV32.
869  * -      0x4000000000	( 256GB) for RV64 using SV39 mmu
870  * -    0x800000000000	( 128TB) for RV64 using SV48 mmu
871  * - 0x100000000000000	(  64PB) for RV64 using SV57 mmu
872  *
873  * Note that PGDIR_SIZE must evenly divide TASK_SIZE since "RISC-V
874  * Instruction Set Manual Volume II: Privileged Architecture" states that
875  * "load and store effective addresses, which are 64bits, must have bits
876  * 63–48 all equal to bit 47, or else a page-fault exception will occur."
877  * Similarly for SV57, bits 63–57 must be equal to bit 56.
878  */
879 #ifdef CONFIG_64BIT
880 #define TASK_SIZE_64	(PGDIR_SIZE * PTRS_PER_PGD / 2)
881 #define TASK_SIZE_MIN	(PGDIR_SIZE_L3 * PTRS_PER_PGD / 2)
882 
883 #ifdef CONFIG_COMPAT
884 #define TASK_SIZE_32	(_AC(0x80000000, UL) - PAGE_SIZE)
885 #define TASK_SIZE	(test_thread_flag(TIF_32BIT) ? \
886 			 TASK_SIZE_32 : TASK_SIZE_64)
887 #else
888 #define TASK_SIZE	TASK_SIZE_64
889 #endif
890 
891 #else
892 #define TASK_SIZE	FIXADDR_START
893 #define TASK_SIZE_MIN	TASK_SIZE
894 #endif
895 
896 #else /* CONFIG_MMU */
897 
898 #define PAGE_SHARED		__pgprot(0)
899 #define PAGE_KERNEL		__pgprot(0)
900 #define swapper_pg_dir		NULL
901 #define TASK_SIZE		0xffffffffUL
902 #define VMALLOC_START		0
903 #define VMALLOC_END		TASK_SIZE
904 
905 #endif /* !CONFIG_MMU */
906 
907 extern char _start[];
908 extern void *_dtb_early_va;
909 extern uintptr_t _dtb_early_pa;
910 #if defined(CONFIG_XIP_KERNEL) && defined(CONFIG_MMU)
911 #define dtb_early_va	(*(void **)XIP_FIXUP(&_dtb_early_va))
912 #define dtb_early_pa	(*(uintptr_t *)XIP_FIXUP(&_dtb_early_pa))
913 #else
914 #define dtb_early_va	_dtb_early_va
915 #define dtb_early_pa	_dtb_early_pa
916 #endif /* CONFIG_XIP_KERNEL */
917 extern u64 satp_mode;
918 
919 void paging_init(void);
920 void misc_mem_init(void);
921 
922 /*
923  * ZERO_PAGE is a global shared page that is always zero,
924  * used for zero-mapped memory areas, etc.
925  */
926 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
927 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
928 
929 #endif /* !__ASSEMBLY__ */
930 
931 #endif /* _ASM_RISCV_PGTABLE_H */
932