1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
5 #ifndef __ASM_ARC_PAGE_H
6 #define __ASM_ARC_PAGE_H
8 #include <uapi/asm/page.h>
12 #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
13 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
15 struct vm_area_struct;
18 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
20 void copy_user_highpage(struct page *to, struct page *from,
21 unsigned long u_vaddr, struct vm_area_struct *vma);
22 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
24 #undef STRICT_MM_TYPECHECKS
26 #ifdef STRICT_MM_TYPECHECKS
28 * These are used to make use of C type-checking..
31 #ifdef CONFIG_ARC_HAS_PAE40
32 unsigned long long pte;
44 #define pte_val(x) ((x).pte)
45 #define pgd_val(x) ((x).pgd)
46 #define pgprot_val(x) ((x).pgprot)
48 #define __pte(x) ((pte_t) { (x) })
49 #define __pgd(x) ((pgd_t) { (x) })
50 #define __pgprot(x) ((pgprot_t) { (x) })
52 #define pte_pgprot(x) __pgprot(pte_val(x))
54 #else /* !STRICT_MM_TYPECHECKS */
56 #ifdef CONFIG_ARC_HAS_PAE40
57 typedef unsigned long long pte_t;
59 typedef unsigned long pte_t;
61 typedef unsigned long pgd_t;
62 typedef unsigned long pgprot_t;
64 #define pte_val(x) (x)
65 #define pgd_val(x) (x)
66 #define pgprot_val(x) (x)
69 #define __pgprot(x) (x)
70 #define pte_pgprot(x) (x)
74 typedef pte_t * pgtable_t;
77 * Use virt_to_pfn with caution:
78 * If used in pte or paddr related macros, it could cause truncation
80 * As a rule of thumb, only use it in helpers starting with virt_
81 * You have been warned !
83 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
86 * When HIGHMEM is enabled we have holes in the memory map so we need
87 * pfn_valid() that takes into account the actual extents of the physical
92 extern unsigned long arch_pfn_offset;
93 #define ARCH_PFN_OFFSET arch_pfn_offset
95 extern int pfn_valid(unsigned long pfn);
96 #define pfn_valid pfn_valid
98 #else /* CONFIG_HIGHMEM */
100 #define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
101 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
103 #endif /* CONFIG_HIGHMEM */
106 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
108 * These macros have historically been misnamed
109 * virt here means link-address/program-address as embedded in object code.
110 * And for ARC, link-addr = physical address
112 #define __pa(vaddr) ((unsigned long)(vaddr))
113 #define __va(paddr) ((void *)((unsigned long)(paddr)))
115 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
116 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
118 /* Default Permissions for stack/heaps pages (Non Executable) */
119 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
121 #define WANT_PAGE_VIRTUAL 1
123 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
124 #include <asm-generic/getorder.h>
126 #endif /* !__ASSEMBLY__ */