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);
41 #define pgd_val(x) ((x).pgd)
42 #define __pgd(x) ((pgd_t) { (x) })
45 #ifdef CONFIG_ARC_HAS_PAE40
46 unsigned long long pte;
52 #define pte_val(x) ((x).pte)
53 #define __pte(x) ((pte_t) { (x) })
59 #define pgprot_val(x) ((x).pgprot)
60 #define __pgprot(x) ((pgprot_t) { (x) })
61 #define pte_pgprot(x) __pgprot(pte_val(x))
63 typedef struct page *pgtable_t;
66 * Use virt_to_pfn with caution:
67 * If used in pte or paddr related macros, it could cause truncation
69 * As a rule of thumb, only use it in helpers starting with virt_
70 * You have been warned !
72 #define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
75 * When HIGHMEM is enabled we have holes in the memory map so we need
76 * pfn_valid() that takes into account the actual extents of the physical
81 extern unsigned long arch_pfn_offset;
82 #define ARCH_PFN_OFFSET arch_pfn_offset
84 extern int pfn_valid(unsigned long pfn);
85 #define pfn_valid pfn_valid
87 #else /* CONFIG_HIGHMEM */
89 #define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
90 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
92 #endif /* CONFIG_HIGHMEM */
95 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
97 * These macros have historically been misnamed
98 * virt here means link-address/program-address as embedded in object code.
99 * And for ARC, link-addr = physical address
101 #define __pa(vaddr) ((unsigned long)(vaddr))
102 #define __va(paddr) ((void *)((unsigned long)(paddr)))
104 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr))
105 #define virt_addr_valid(kaddr) pfn_valid(virt_to_pfn(kaddr))
107 /* Default Permissions for stack/heaps pages (Non Executable) */
108 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC
110 #define WANT_PAGE_VIRTUAL 1
112 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
113 #include <asm-generic/getorder.h>
115 #endif /* !__ASSEMBLY__ */