1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5 #ifndef _ASM_PAGE_H
6 #define _ASM_PAGE_H
7
8 #include <linux/const.h>
9 #include <asm/addrspace.h>
10
11 /*
12 * PAGE_SHIFT determines the page size
13 */
14 #define PAGE_SHIFT CONFIG_PAGE_SHIFT
15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
16 #define PAGE_MASK (~(PAGE_SIZE - 1))
17
18 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
19 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
20 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
21 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
22
23 #ifndef __ASSEMBLY__
24
25 #include <linux/kernel.h>
26 #include <linux/pfn.h>
27
28 /*
29 * It's normally defined only for FLATMEM config but it's
30 * used in our early mem init code for all memory models.
31 * So always define it.
32 */
33 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
34
35 extern void clear_page(void *page);
36 extern void copy_page(void *to, void *from);
37
38 #define clear_user_page(page, vaddr, pg) clear_page(page)
39 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
40
41 extern unsigned long shm_align_mask;
42
43 struct page;
44 struct vm_area_struct;
45 void copy_user_highpage(struct page *to, struct page *from,
46 unsigned long vaddr, struct vm_area_struct *vma);
47
48 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
49
50 typedef struct { unsigned long pte; } pte_t;
51 #define pte_val(x) ((x).pte)
52 #define __pte(x) ((pte_t) { (x) })
53 typedef struct page *pgtable_t;
54
55 typedef struct { unsigned long pgd; } pgd_t;
56 #define pgd_val(x) ((x).pgd)
57 #define __pgd(x) ((pgd_t) { (x) })
58
59 /*
60 * Manipulate page protection bits
61 */
62 typedef struct { unsigned long pgprot; } pgprot_t;
63 #define pgprot_val(x) ((x).pgprot)
64 #define __pgprot(x) ((pgprot_t) { (x) })
65 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK)
66
67 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
68
69 /*
70 * __pa()/__va() should be used only during mem init.
71 */
72 #define __pa(x) PHYSADDR(x)
73 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
74
75 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
76 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
77
78 struct page *dmw_virt_to_page(unsigned long kaddr);
79 struct page *tlb_virt_to_page(unsigned long kaddr);
80
81 #define pfn_to_phys(pfn) __pfn_to_phys(pfn)
82 #define phys_to_pfn(paddr) __phys_to_pfn(paddr)
83
84 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page))
85 #define phys_to_page(paddr) pfn_to_page(phys_to_pfn(paddr))
86
87 #ifndef CONFIG_KFENCE
88
89 #define page_to_virt(page) __va(page_to_phys(page))
90 #define virt_to_page(kaddr) phys_to_page(__pa(kaddr))
91
92 #else
93
94 #define WANT_PAGE_VIRTUAL
95
96 #define page_to_virt(page) \
97 ({ \
98 extern char *__kfence_pool; \
99 (__kfence_pool == NULL) ? __va(page_to_phys(page)) : page_address(page); \
100 })
101
102 #define virt_to_page(kaddr) \
103 ({ \
104 (likely((unsigned long)kaddr < vm_map_base)) ? \
105 dmw_virt_to_page((unsigned long)kaddr) : tlb_virt_to_page((unsigned long)kaddr);\
106 })
107
108 #endif
109
110 #define pfn_to_virt(pfn) page_to_virt(pfn_to_page(pfn))
111 #define virt_to_pfn(kaddr) page_to_pfn(virt_to_page(kaddr))
112
113 extern int __virt_addr_valid(volatile void *kaddr);
114 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr))
115
116 #define VM_DATA_DEFAULT_FLAGS \
117 (VM_READ | VM_WRITE | \
118 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
119 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
120
121 #include <asm-generic/memory_model.h>
122 #include <asm-generic/getorder.h>
123
124 #endif /* !__ASSEMBLY__ */
125
126 #endif /* _ASM_PAGE_H */
127
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