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 #ifdef CONFIG_PAGE_SIZE_4KB
15 #define PAGE_SHIFT 12
16 #endif
17 #ifdef CONFIG_PAGE_SIZE_16KB
18 #define PAGE_SHIFT 14
19 #endif
20 #ifdef CONFIG_PAGE_SIZE_64KB
21 #define PAGE_SHIFT 16
22 #endif
23 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
24 #define PAGE_MASK (~(PAGE_SIZE - 1))
25
26 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
27 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
28 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
29 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
30
31 #ifndef __ASSEMBLY__
32
33 #include <linux/kernel.h>
34 #include <linux/pfn.h>
35
36 /*
37 * It's normally defined only for FLATMEM config but it's
38 * used in our early mem init code for all memory models.
39 * So always define it.
40 */
41 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
42
43 extern void clear_page(void *page);
44 extern void copy_page(void *to, void *from);
45
46 #define clear_user_page(page, vaddr, pg) clear_page(page)
47 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
48
49 extern unsigned long shm_align_mask;
50
51 struct page;
52 struct vm_area_struct;
53 void copy_user_highpage(struct page *to, struct page *from,
54 unsigned long vaddr, struct vm_area_struct *vma);
55
56 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
57
58 typedef struct { unsigned long pte; } pte_t;
59 #define pte_val(x) ((x).pte)
60 #define __pte(x) ((pte_t) { (x) })
61 typedef struct page *pgtable_t;
62
63 typedef struct { unsigned long pgd; } pgd_t;
64 #define pgd_val(x) ((x).pgd)
65 #define __pgd(x) ((pgd_t) { (x) })
66
67 /*
68 * Manipulate page protection bits
69 */
70 typedef struct { unsigned long pgprot; } pgprot_t;
71 #define pgprot_val(x) ((x).pgprot)
72 #define __pgprot(x) ((pgprot_t) { (x) })
73 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK)
74
75 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
76
77 /*
78 * __pa()/__va() should be used only during mem init.
79 */
80 #define __pa(x) PHYSADDR(x)
81 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
82
83 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
84
85 #ifdef CONFIG_FLATMEM
86
pfn_valid(unsigned long pfn)87 static inline int pfn_valid(unsigned long pfn)
88 {
89 /* avoid <linux/mm.h> include hell */
90 extern unsigned long max_mapnr;
91 unsigned long pfn_offset = ARCH_PFN_OFFSET;
92
93 return pfn >= pfn_offset && pfn < max_mapnr;
94 }
95
96 #endif
97
98 #define virt_to_pfn(kaddr) PFN_DOWN(PHYSADDR(kaddr))
99 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
100
101 extern int __virt_addr_valid(volatile void *kaddr);
102 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr))
103
104 #define VM_DATA_DEFAULT_FLAGS \
105 (VM_READ | VM_WRITE | \
106 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
107 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
108
109 #include <asm-generic/memory_model.h>
110 #include <asm-generic/getorder.h>
111
112 #endif /* !__ASSEMBLY__ */
113
114 #endif /* _ASM_PAGE_H */
115
