1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
8 #include <linux/const.h>
11 * PAGE_SHIFT determines the page size
13 #ifdef CONFIG_PAGE_SIZE_4KB
16 #ifdef CONFIG_PAGE_SIZE_16KB
19 #ifdef CONFIG_PAGE_SIZE_64KB
22 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
23 #define PAGE_MASK (~(PAGE_SIZE - 1))
25 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
26 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
27 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
28 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
32 #include <linux/kernel.h>
33 #include <linux/pfn.h>
35 #define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT))
38 * It's normally defined only for FLATMEM config but it's
39 * used in our early mem init code for all memory models.
40 * So always define it.
42 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
44 extern void clear_page(void *page);
45 extern void copy_page(void *to, void *from);
47 #define clear_user_page(page, vaddr, pg) clear_page(page)
48 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
50 extern unsigned long shm_align_mask;
53 struct vm_area_struct;
54 void copy_user_highpage(struct page *to, struct page *from,
55 unsigned long vaddr, struct vm_area_struct *vma);
57 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
59 typedef struct { unsigned long pte; } pte_t;
60 #define pte_val(x) ((x).pte)
61 #define __pte(x) ((pte_t) { (x) })
62 typedef struct page *pgtable_t;
64 typedef struct { unsigned long pgd; } pgd_t;
65 #define pgd_val(x) ((x).pgd)
66 #define __pgd(x) ((pgd_t) { (x) })
69 * Manipulate page protection bits
71 typedef struct { unsigned long pgprot; } pgprot_t;
72 #define pgprot_val(x) ((x).pgprot)
73 #define __pgprot(x) ((pgprot_t) { (x) })
74 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK)
76 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
79 * __pa()/__va() should be used only during mem init.
81 #define __pa(x) PHYSADDR(x)
82 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
84 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
88 static inline int pfn_valid(unsigned long pfn)
90 /* avoid <linux/mm.h> include hell */
91 extern unsigned long max_mapnr;
92 unsigned long pfn_offset = ARCH_PFN_OFFSET;
94 return pfn >= pfn_offset && pfn < max_mapnr;
99 #define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr)))
100 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
102 extern int __virt_addr_valid(volatile void *kaddr);
103 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr))
105 #define VM_DATA_DEFAULT_FLAGS \
106 (VM_READ | VM_WRITE | \
107 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
108 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
110 #include <asm-generic/memory_model.h>
111 #include <asm-generic/getorder.h>
113 #endif /* !__ASSEMBLY__ */
115 #endif /* _ASM_PAGE_H */