page.h

  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 - PTRLOG)
 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 __ASSEMBLER__
 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 /* !__ASSEMBLER__ */
114
115#endif /* _ASM_PAGE_H */