1/*
  2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3 *
  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.
  7 */
  8#ifndef __ASM_ARC_PAGE_H
  9#define __ASM_ARC_PAGE_H
 10
 11#include <uapi/asm/page.h>
 12
 13#ifndef __ASSEMBLY__
 14
 15#define clear_page(paddr)		memset((paddr), 0, PAGE_SIZE)
 16#define copy_page(to, from)		memcpy((to), (from), PAGE_SIZE)
 17
 18struct vm_area_struct;
 19struct page;
 20
 21#define __HAVE_ARCH_COPY_USER_HIGHPAGE
 22
 23void copy_user_highpage(struct page *to, struct page *from,
 24			unsigned long u_vaddr, struct vm_area_struct *vma);
 25void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);
 26
 27#undef STRICT_MM_TYPECHECKS
 28
 29#ifdef STRICT_MM_TYPECHECKS
 30/*
 31 * These are used to make use of C type-checking..
 32 */
 33typedef struct {
 34#ifdef CONFIG_ARC_HAS_PAE40
 35	unsigned long long pte;
 36#else
 37	unsigned long pte;
 38#endif
 39} pte_t;
 40typedef struct {
 41	unsigned long pgd;
 42} pgd_t;
 43typedef struct {
 44	unsigned long pgprot;
 45} pgprot_t;
 46
 47#define pte_val(x)      ((x).pte)
 48#define pgd_val(x)      ((x).pgd)
 49#define pgprot_val(x)   ((x).pgprot)
 50
 51#define __pte(x)        ((pte_t) { (x) })
 52#define __pgd(x)        ((pgd_t) { (x) })
 53#define __pgprot(x)     ((pgprot_t) { (x) })
 54
 55#define pte_pgprot(x) __pgprot(pte_val(x))
 56
 57#else /* !STRICT_MM_TYPECHECKS */
 58
 59#ifdef CONFIG_ARC_HAS_PAE40
 60typedef unsigned long long pte_t;
 61#else
 62typedef unsigned long pte_t;
 63#endif
 64typedef unsigned long pgd_t;
 65typedef unsigned long pgprot_t;
 66
 67#define pte_val(x)	(x)
 68#define pgd_val(x)	(x)
 69#define pgprot_val(x)	(x)
 70#define __pte(x)	(x)
 71#define __pgd(x)	(x)
 72#define __pgprot(x)	(x)
 73#define pte_pgprot(x)	(x)
 74
 75#endif
 76
 77typedef pte_t * pgtable_t;
 78
 79/*
 80 * Use virt_to_pfn with caution:
 81 * If used in pte or paddr related macros, it could cause truncation
 82 * in PAE40 builds
 83 * As a rule of thumb, only use it in helpers starting with virt_
 84 * You have been warned !
 85 */
 86#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
 87
 88#define ARCH_PFN_OFFSET		virt_to_pfn(CONFIG_LINUX_LINK_BASE)
 89
 90#ifdef CONFIG_FLATMEM
 91#define pfn_valid(pfn)		(((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
 92#endif
 93
 94/*
 95 * __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
 96 *
 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
100 */
101#define __pa(vaddr)  ((unsigned long)(vaddr))
102#define __va(paddr)  ((void *)((unsigned long)(paddr)))
103
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))
106
107/* Default Permissions for stack/heaps pages (Non Executable) */
108#define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
109
110#define WANT_PAGE_VIRTUAL   1
111
112#include <asm-generic/memory_model.h>   /* page_to_pfn, pfn_to_page */
113#include <asm-generic/getorder.h>
114
115#endif /* !__ASSEMBLY__ */
116
117#endif