/*
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __ASM_ARC_PAGE_H
#define __ASM_ARC_PAGE_H

#include <uapi/asm/page.h>


#ifndef __ASSEMBLY__

#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
#define free_user_page(page, addr) free_page(addr)

#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)

struct vm_area_struct;
struct page;

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

void copy_user_highpage(struct page *to, struct page *from,
unsigned long u_vaddr, struct vm_area_struct *vma);
void clear_user_page(void *to, unsigned long u_vaddr, struct page *page);

#undef STRICT_MM_TYPECHECKS

#ifdef STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking..
*/
typedef struct {
unsigned long pte;
} pte_t;
typedef struct {
unsigned long pgd;
} pgd_t;
typedef struct {
unsigned long pgprot;
} pgprot_t;
typedef unsigned long pgtable_t;

#define pte_val(x) ((x).pte)
#define pgd_val(x) ((x).pgd)
#define pgprot_val(x) ((x).pgprot)

#define __pte(x) ((pte_t) { (x) })
#define __pgd(x) ((pgd_t) { (x) })
#define __pgprot(x) ((pgprot_t) { (x) })

#define pte_pgprot(x) __pgprot(pte_val(x))

#else /* !STRICT_MM_TYPECHECKS */

typedef unsigned long pte_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
typedef unsigned long pgtable_t;

#define pte_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pgprot(x) (x)
#define pte_pgprot(x) (x)

#endif

#define ARCH_PFN_OFFSET (CONFIG_LINUX_LINK_BASE >> PAGE_SHIFT)

#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)

/*
* __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
*
* These macros have historically been misnamed
* virt here means link-address/program-address as embedded in object code.
* So if kernel img is linked at 0x8000_0000 onwards, 0x8010_0000 will be
* 128th page, and virt_to_page( ) will return the struct page corresp to it.
* mem_map[ ] is an array of struct page for each page frame in the system
*
* Independent of where linux is linked at, link-addr = physical address
* So the old macro __pa = vaddr + PAGE_OFFSET - CONFIG_LINUX_LINK_BASE
* would have been wrong in case kernel is not at 0x8zs
*/
#define __pa(vaddr) ((unsigned long)vaddr)
#define __va(paddr) ((void *)((unsigned long)(paddr)))

#define virt_to_page(kaddr) \
(mem_map + ((__pa(kaddr) - CONFIG_LINUX_LINK_BASE) >> PAGE_SHIFT))

#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

/* Default Permissions for stack/heaps pages (Non Executable) */
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)

#define WANT_PAGE_VIRTUAL 1

#include <asm-generic/memory_model.h> /* page_to_pfn, pfn_to_page */
#include <asm-generic/getorder.h>

#endif /* !__ASSEMBLY__ */

#endif