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