1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2000 - 2003 Jeff Dike (jdike@addtoit.com) 4 * Copyright 2003 PathScale, Inc. 5 */ 6 7 #ifndef __UM_PAGE_H 8 #define __UM_PAGE_H 9 10 #include <linux/const.h> 11 12 /* PAGE_SHIFT determines the page size */ 13 #define PAGE_SHIFT 12 14 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 15 #define PAGE_MASK (~(PAGE_SIZE-1)) 16 17 #ifndef __ASSEMBLY__ 18 19 struct page; 20 21 #include <linux/pfn.h> 22 #include <linux/types.h> 23 #include <asm/vm-flags.h> 24 25 /* 26 * These are used to make use of C type-checking.. 27 */ 28 29 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE) 30 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE) 31 32 #define clear_user_page(page, vaddr, pg) clear_page(page) 33 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 34 35 #if defined(CONFIG_3_LEVEL_PGTABLES) && !defined(CONFIG_64BIT) 36 37 typedef struct { unsigned long pte; } pte_t; 38 typedef struct { unsigned long pmd; } pmd_t; 39 typedef struct { unsigned long pgd; } pgd_t; 40 #define pte_val(p) ((p).pte) 41 42 #define pte_get_bits(p, bits) ((p).pte & (bits)) 43 #define pte_set_bits(p, bits) ((p).pte |= (bits)) 44 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits)) 45 #define pte_copy(to, from) ({ (to).pte = (from).pte; }) 46 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE)) 47 #define pte_set_val(p, phys, prot) \ 48 ({ (p).pte = (phys) | pgprot_val(prot); }) 49 50 #define pmd_val(x) ((x).pmd) 51 #define __pmd(x) ((pmd_t) { (x) } ) 52 53 typedef unsigned long long phys_t; 54 55 #else 56 57 typedef struct { unsigned long pte; } pte_t; 58 typedef struct { unsigned long pgd; } pgd_t; 59 60 #ifdef CONFIG_3_LEVEL_PGTABLES 61 typedef struct { unsigned long pmd; } pmd_t; 62 #define pmd_val(x) ((x).pmd) 63 #define __pmd(x) ((pmd_t) { (x) } ) 64 #endif 65 66 #define pte_val(x) ((x).pte) 67 68 69 #define pte_get_bits(p, bits) ((p).pte & (bits)) 70 #define pte_set_bits(p, bits) ((p).pte |= (bits)) 71 #define pte_clear_bits(p, bits) ((p).pte &= ~(bits)) 72 #define pte_copy(to, from) ((to).pte = (from).pte) 73 #define pte_is_zero(p) (!((p).pte & ~_PAGE_NEWPAGE)) 74 #define pte_set_val(p, phys, prot) (p).pte = (phys | pgprot_val(prot)) 75 76 typedef unsigned long phys_t; 77 78 #endif 79 80 typedef struct { unsigned long pgprot; } pgprot_t; 81 82 typedef struct page *pgtable_t; 83 84 #define pgd_val(x) ((x).pgd) 85 #define pgprot_val(x) ((x).pgprot) 86 87 #define __pte(x) ((pte_t) { (x) } ) 88 #define __pgd(x) ((pgd_t) { (x) } ) 89 #define __pgprot(x) ((pgprot_t) { (x) } ) 90 91 extern unsigned long uml_physmem; 92 93 #define PAGE_OFFSET (uml_physmem) 94 #define KERNELBASE PAGE_OFFSET 95 96 #define __va_space (8*1024*1024) 97 98 #include <mem.h> 99 100 /* Cast to unsigned long before casting to void * to avoid a warning from 101 * mmap_kmem about cutting a long long down to a void *. Not sure that 102 * casting is the right thing, but 32-bit UML can't have 64-bit virtual 103 * addresses 104 */ 105 #define __pa(virt) uml_to_phys((void *) (unsigned long) (virt)) 106 #define __va(phys) uml_to_virt((unsigned long) (phys)) 107 108 #define phys_to_pfn(p) ((p) >> PAGE_SHIFT) 109 #define pfn_to_phys(pfn) PFN_PHYS(pfn) 110 111 #define pfn_valid(pfn) ((pfn) < max_mapnr) 112 #define virt_addr_valid(v) pfn_valid(phys_to_pfn(__pa(v))) 113 114 #include <asm-generic/memory_model.h> 115 #include <asm-generic/getorder.h> 116 117 #endif /* __ASSEMBLY__ */ 118 119 #ifdef CONFIG_X86_32 120 #define __HAVE_ARCH_GATE_AREA 1 121 #endif 122 123 #endif /* __UM_PAGE_H */ 124