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/*
* 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
/* PAGE_SHIFT determines the page size */
#if defined(CONFIG_ARC_PAGE_SIZE_16K)
#define PAGE_SHIFT 14
#elif defined(CONFIG_ARC_PAGE_SIZE_4K)
#define PAGE_SHIFT 12
#else
/*
* Default 8k
* done this way (instead of under CONFIG_ARC_PAGE_SIZE_8K) because adhoc
* user code (busybox appletlib.h) expects PAGE_SHIFT to be defined w/o
* using the correct uClibc header and in their build our autoconf.h is
* not available
*/
#define PAGE_SHIFT 13
#endif
#ifdef __ASSEMBLY__
#define PAGE_SIZE (1 << PAGE_SHIFT)
#define PAGE_OFFSET (0x80000000)
#else
#define PAGE_SIZE (1UL << PAGE_SHIFT) /* Default 8K */
#define PAGE_OFFSET (0x80000000UL) /* Kernel starts at 2G onwards */
#endif
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#define get_user_page(vaddr) __get_free_page(GFP_KERNEL)
#define free_user_page(page, addr) free_page(addr)
/* TBD: for now don't worry about VIPT D$ aliasing */
#define clear_page(paddr) memset((paddr), 0, PAGE_SIZE)
#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
#define clear_user_page(addr, vaddr, pg) clear_page(addr)
#define copy_user_page(vto, vfrom, vaddr, pg) copy_page(vto, vfrom)
#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) })
#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)
#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 page, used in mmap.c */
#ifdef CONFIG_ARC_STACK_NONEXEC
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE)
#else
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#endif
#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 /* __KERNEL__ */
#endif
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