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Linux/arch/openrisc/include/asm/page.h

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  1 /*
  2  * OpenRISC Linux
  3  *
  4  * Linux architectural port borrowing liberally from similar works of
  5  * others.  All original copyrights apply as per the original source
  6  * declaration.
  7  *
  8  * OpenRISC implementation:
  9  * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
 10  * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
 11  * et al.
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License as published by
 15  * the Free Software Foundation; either version 2 of the License, or
 16  * (at your option) any later version.
 17  */
 18 
 19 #ifndef __ASM_OPENRISC_PAGE_H
 20 #define __ASM_OPENRISC_PAGE_H
 21 
 22 
 23 /* PAGE_SHIFT determines the page size */
 24 
 25 #define PAGE_SHIFT      13
 26 #ifdef __ASSEMBLY__
 27 #define PAGE_SIZE       (1 << PAGE_SHIFT)
 28 #else
 29 #define PAGE_SIZE       (1UL << PAGE_SHIFT)
 30 #endif
 31 #define PAGE_MASK       (~(PAGE_SIZE-1))
 32 
 33 #define PAGE_OFFSET     0xc0000000
 34 #define KERNELBASE      PAGE_OFFSET
 35 
 36 /* This is not necessarily the right place for this, but it's needed by
 37  * drivers/of/fdt.c
 38  */
 39 #include <asm/setup.h>
 40 
 41 #ifndef __ASSEMBLY__
 42 
 43 #define clear_page(page)        memset((page), 0, PAGE_SIZE)
 44 #define copy_page(to, from)     memcpy((to), (from), PAGE_SIZE)
 45 
 46 #define clear_user_page(page, vaddr, pg)        clear_page(page)
 47 #define copy_user_page(to, from, vaddr, pg)     copy_page(to, from)
 48 
 49 /*
 50  * These are used to make use of C type-checking..
 51  */
 52 typedef struct {
 53         unsigned long pte;
 54 } pte_t;
 55 typedef struct {
 56         unsigned long pgd;
 57 } pgd_t;
 58 typedef struct {
 59         unsigned long pgprot;
 60 } pgprot_t;
 61 typedef struct page *pgtable_t;
 62 
 63 #define pte_val(x)      ((x).pte)
 64 #define pgd_val(x)      ((x).pgd)
 65 #define pgprot_val(x)   ((x).pgprot)
 66 
 67 #define __pte(x)        ((pte_t) { (x) })
 68 #define __pgd(x)        ((pgd_t) { (x) })
 69 #define __pgprot(x)     ((pgprot_t) { (x) })
 70 
 71 #endif /* !__ASSEMBLY__ */
 72 
 73 
 74 #ifndef __ASSEMBLY__
 75 
 76 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET))
 77 #define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
 78 
 79 #define virt_to_pfn(kaddr)      (__pa(kaddr) >> PAGE_SHIFT)
 80 #define pfn_to_virt(pfn)        __va((pfn) << PAGE_SHIFT)
 81 
 82 #define virt_to_page(addr) \
 83         (mem_map + (((unsigned long)(addr)-PAGE_OFFSET) >> PAGE_SHIFT))
 84 
 85 #define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
 86 
 87 #define pfn_valid(pfn)          ((pfn) < max_mapnr)
 88 
 89 #define virt_addr_valid(kaddr)  (pfn_valid(virt_to_pfn(kaddr)))
 90 
 91 #endif /* __ASSEMBLY__ */
 92 
 93 
 94 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
 95                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
 96 
 97 
 98 #include <asm-generic/memory_model.h>
 99 #include <asm-generic/getorder.h>
100 
101 #endif /* __ASM_OPENRISC_PAGE_H */
102 

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