2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 #ifndef __ASM_ARC_PAGE_H
9 #define __ASM_ARC_PAGE_H
11 #include <uapi/asm/page.h>
16 #define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
17 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
19 struct vm_area_struct;
22 #define __HAVE_ARCH_COPY_USER_HIGHPAGE
24 void copy_user_highpage(struct page *to, struct page *from,
25 unsigned long u_vaddr, struct vm_area_struct *vma);
26 void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
28 #undef STRICT_MM_TYPECHECKS
30 #ifdef STRICT_MM_TYPECHECKS
32 * These are used to make use of C type-checking..
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;
76 #define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)
78 #define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
81 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
83 * These macros have historically been misnamed
84 * virt here means link-address/program-address as embedded in object code.
85 * So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
86 * 128th page, and virt_to_page( ) will return the struct page corresp to it.
87 * mem_map[ ] is an array of struct page for each page frame in the system
89 * Independent of where linux is linked at, link-addr = physical address
90 * So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
91 * would have been wrong in case kernel is not at 0x8zs
93 #define __pa(vaddr) ((unsigned long)vaddr)
94 #define __va(paddr) ((void *)((unsigned long)(paddr)))
96 #define virt_to_page(kaddr) \
97 (mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))
99 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
101 /* Default Permissions for stack/heaps pages (Non Executable) */
102 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
104 #define WANT_PAGE_VIRTUAL 1
106 #include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
107 #include <asm-generic/getorder.h>
109 #endif /* !__ASSEMBLY__ */