115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
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*/
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#ifndef _ASM_PAGE_H
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#define _ASM_PAGE_H
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#include <linux/const.h>
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#include <asm/addrspace.h>
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/*
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* PAGE_SHIFT determines the page size
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*/
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#ifdef CONFIG_PAGE_SIZE_4KB
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#define PAGE_SHIFT 12
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#define PAGE_SHIFT 14
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define PAGE_SHIFT 16
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#endif
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#define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT)
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#define PAGE_MASK (~(PAGE_SIZE - 1))
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#define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3)
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#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE - 1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
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#ifndef __ASSEMBLY__
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#include <linux/kernel.h>
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#include <linux/pfn.h>
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/*
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* It's normally defined only for FLATMEM config but it's
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* used in our early mem init code for all memory models.
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* So always define it.
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*/
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#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
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extern void clear_page(void *page);
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extern void copy_page(void *to, void *from);
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#define clear_user_page(page, vaddr, pg) clear_page(page)
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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extern unsigned long shm_align_mask;
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struct page;
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struct vm_area_struct;
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void copy_user_highpage(struct page *to, struct page *from,
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unsigned long vaddr, struct vm_area_struct *vma);
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#define __HAVE_ARCH_COPY_USER_HIGHPAGE
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typedef struct { unsigned long pte; } pte_t;
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#define pte_val(x) ((x).pte)
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#define __pte(x) ((pte_t) { (x) })
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typedef struct page *pgtable_t;
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typedef struct { unsigned long pgd; } pgd_t;
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#define pgd_val(x) ((x).pgd)
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#define __pgd(x) ((pgd_t) { (x) })
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/*
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* Manipulate page protection bits
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*/
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typedef struct { unsigned long pgprot; } pgprot_t;
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#define pgprot_val(x) ((x).pgprot)
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#define __pgprot(x) ((pgprot_t) { (x) })
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#define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK)
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#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
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/*
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* __pa()/__va() should be used only during mem init.
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*/
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#define __pa(x) PHYSADDR(x)
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#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
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#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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#ifdef CONFIG_FLATMEM
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static inline int pfn_valid(unsigned long pfn)
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{
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/* avoid <linux/mm.h> include hell */
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extern unsigned long max_mapnr;
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unsigned long pfn_offset = ARCH_PFN_OFFSET;
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return pfn >= pfn_offset && pfn < max_mapnr;
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}
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#endif
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#define virt_to_pfn(kaddr) PFN_DOWN(PHYSADDR(kaddr))
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#define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
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extern int __virt_addr_valid(volatile void *kaddr);
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#define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr))
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#define VM_DATA_DEFAULT_FLAGS \
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(VM_READ | VM_WRITE | \
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((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
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VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
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#include <asm-generic/memory_model.h>
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#include <asm-generic/getorder.h>
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_PAGE_H */
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