1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PAGE_H 3 #define _ASM_X86_PAGE_H 4 5 #include <linux/types.h> 6 7 #ifdef __KERNEL__ 8 9 #include <asm/page_types.h> 10 11 #ifdef CONFIG_X86_64 12 #include <asm/page_64.h> 13 #else 14 #include <asm/page_32.h> 15 #endif /* CONFIG_X86_64 */ 16 17 #ifndef __ASSEMBLER__ 18 19 struct page; 20 21 #include <linux/range.h> 22 extern struct range pfn_mapped[]; 23 extern int nr_pfn_mapped; 24 25 static inline void copy_user_page(void *to, void *from, unsigned long vaddr, 26 struct page *topage) 27 { 28 copy_page(to, from); 29 } 30 31 #define vma_alloc_zeroed_movable_folio(vma, vaddr) \ 32 vma_alloc_folio(GFP_HIGHUSER_MOVABLE | __GFP_ZERO, 0, vma, vaddr) 33 34 #ifndef __pa 35 #define __pa(x) __phys_addr((unsigned long)(x)) 36 #endif 37 38 #define __pa_nodebug(x) __phys_addr_nodebug((unsigned long)(x)) 39 /* __pa_symbol should be used for C visible symbols. 40 This seems to be the official gcc blessed way to do such arithmetic. */ 41 /* 42 * We need __phys_reloc_hide() here because gcc may assume that there is no 43 * overflow during __pa() calculation and can optimize it unexpectedly. 44 * Newer versions of gcc provide -fno-strict-overflow switch to handle this 45 * case properly. Once all supported versions of gcc understand it, we can 46 * remove this Voodoo magic stuff. (i.e. once gcc3.x is deprecated) 47 */ 48 #define __pa_symbol(x) \ 49 __phys_addr_symbol(__phys_reloc_hide((unsigned long)(x))) 50 51 #ifndef __va 52 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET)) 53 #endif 54 55 #define __boot_va(x) __va(x) 56 #define __boot_pa(x) __pa(x) 57 58 /* 59 * virt_to_page(kaddr) returns a valid pointer if and only if 60 * virt_addr_valid(kaddr) returns true. 61 */ 62 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 63 extern bool __virt_addr_valid(unsigned long kaddr); 64 #define virt_addr_valid(kaddr) __virt_addr_valid((unsigned long) (kaddr)) 65 66 static __always_inline void *pfn_to_kaddr(unsigned long pfn) 67 { 68 return __va(pfn << PAGE_SHIFT); 69 } 70 71 static __always_inline u64 __canonical_address(u64 vaddr, u8 vaddr_bits) 72 { 73 return ((s64)vaddr << (64 - vaddr_bits)) >> (64 - vaddr_bits); 74 } 75 76 static __always_inline u64 __is_canonical_address(u64 vaddr, u8 vaddr_bits) 77 { 78 return __canonical_address(vaddr, vaddr_bits) == vaddr; 79 } 80 81 #endif /* __ASSEMBLER__ */ 82 83 #include <asm-generic/memory_model.h> 84 #include <asm-generic/getorder.h> 85 86 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 87 88 #endif /* __KERNEL__ */ 89 #endif /* _ASM_X86_PAGE_H */ 90