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>
10 #ifdef CONFIG_ARC_HAS_PAE40
12 #define MAX_POSSIBLE_PHYSMEM_BITS 40
13 #define PAGE_MASK_PHYS (0xff00000000ull | PAGE_MASK)
15 #else /* CONFIG_ARC_HAS_PAE40 */
17 #define MAX_POSSIBLE_PHYSMEM_BITS 32
18 #define PAGE_MASK_PHYS PAGE_MASK
20 #endif /* CONFIG_ARC_HAS_PAE40 */
24 #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
25 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
26 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
28 struct vm_area_struct;
31 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
33 void copy_user_highpage(struct page *to, struct page *from,
34 unsigned long u_vaddr, struct vm_area_struct *vma);
35 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
38 #ifdef CONFIG_ARC_HAS_PAE40
39 unsigned long long pte;
51 #define pte_val(x) ((x).pte)
52 #define pgd_val(x) ((x).pgd)
53 #define pgprot_val(x) ((x).pgprot)
55 #define __pte(x) ((pte_t) { (x) })
56 #define __pgd(x) ((pgd_t) { (x) })
57 #define __pgprot(x) ((pgprot_t) { (x) })
59 #define pte_pgprot(x) __pgprot(pte_val(x))
61 typedef pte_t * pgtable_t;
64 * Use virt_to_pfn with caution:
65 * If used in pte or paddr related macros, it could cause truncation
67 * As a rule of thumb, only use it in helpers starting with virt_
68 * You have been warned !
70 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
73 * When HIGHMEM is enabled we have holes in the memory map so we need
74 * pfn_valid() that takes into account the actual extents of the physical
79 extern unsigned long arch_pfn_offset;
80 #define ARCH_PFN_OFFSET arch_pfn_offset
82 extern int pfn_valid(unsigned long pfn);
83 #define pfn_valid pfn_valid
85 #else /* CONFIG_HIGHMEM */
87 #define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
88 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
90 #endif /* CONFIG_HIGHMEM */
93 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
95 * These macros have historically been misnamed
96 * virt here means link-address/program-address as embedded in object code.
97 * And for ARC, link-addr = physical address
99 #define __pa(vaddr) ((unsigned long)(vaddr))
100 #define __va(paddr) ((void *)((unsigned long)(paddr)))
102 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
103 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
105 /* Default Permissions for stack/heaps pages (Non Executable) */
106 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
108 #define WANT_PAGE_VIRTUAL 1
110 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
111 #include <asm-generic/getorder.h>
113 #endif /* !__ASSEMBLY__ */