1/*
  2 * linux/arch/unicore32/include/asm/memory.h
  3 *
  4 * Code specific to PKUnity SoC and UniCore ISA
  5 *
  6 * Copyright (C) 2001-2010 GUAN Xue-tao
  7 *
  8 * This program is free software; you can redistribute it and/or modify
  9 * it under the terms of the GNU General Public License version 2 as
 10 * published by the Free Software Foundation.
 11 *
 12 *  Note: this file should not be included by non-asm/.h files
 13 */
 14#ifndef __UNICORE_MEMORY_H__
 15#define __UNICORE_MEMORY_H__
 16
 17#include <linux/compiler.h>
 18#include <linux/const.h>
 19#include <asm/sizes.h>
 20#include <mach/memory.h>
 21
 22/*
 23 * Allow for constants defined here to be used from assembly code
 24 * by prepending the UL suffix only with actual C code compilation.
 25 */
 26#define UL(x) _AC(x, UL)
 27
 28/*
 29 * PAGE_OFFSET - the virtual address of the start of the kernel image
 30 * TASK_SIZE - the maximum size of a user space task.
 31 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
 32 */
 33#define PAGE_OFFSET		UL(0xC0000000)
 34#define TASK_SIZE		(PAGE_OFFSET - UL(0x41000000))
 35#define TASK_UNMAPPED_BASE	(PAGE_OFFSET / 3)
 36
 37/*
 38 * The module space lives between the addresses given by TASK_SIZE
 39 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
 40 */
 41#define MODULES_VADDR		(PAGE_OFFSET - 16*1024*1024)
 42#if TASK_SIZE > MODULES_VADDR
 43#error Top of user space clashes with start of module space
 44#endif
 45
 46#define MODULES_END		(PAGE_OFFSET)
 47
 48/*
 49 * Allow 16MB-aligned ioremap pages
 50 */
 51#define IOREMAP_MAX_ORDER	24
 52
 53/*
 54 * Physical vs virtual RAM address space conversion.  These are
 55 * private definitions which should NOT be used outside memory.h
 56 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 57 */
 58#ifndef __virt_to_phys
 59#define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
 60#define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
 61#endif
 62
 63/*
 64 * Convert a physical address to a Page Frame Number and back
 65 */
 66#define	__phys_to_pfn(paddr)	((paddr) >> PAGE_SHIFT)
 67#define	__pfn_to_phys(pfn)	((pfn) << PAGE_SHIFT)
 68
 69/*
 70 * Convert a page to/from a physical address
 71 */
 72#define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
 73#define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))
 74
 75#ifndef __ASSEMBLY__
 76
 77#ifndef arch_adjust_zones
 78#define arch_adjust_zones(size, holes) do { } while (0)
 79#endif
 80
 81/*
 82 * PFNs are used to describe any physical page; this means
 83 * PFN 0 == physical address 0.
 84 *
 85 * This is the PFN of the first RAM page in the kernel
 86 * direct-mapped view.  We assume this is the first page
 87 * of RAM in the mem_map as well.
 88 */
 89#define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
 90
 91/*
 92 * Drivers should NOT use these either.
 93 */
 94#define __pa(x)			__virt_to_phys((unsigned long)(x))
 95#define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
 96#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
 97
 98/*
 99 * Conversion between a struct page and a physical address.
100 *
101 * Note: when converting an unknown physical address to a
102 * struct page, the resulting pointer must be validated
103 * using VALID_PAGE().  It must return an invalid struct page
104 * for any physical address not corresponding to a system
105 * RAM address.
106 *
107 *  page_to_pfn(page)	convert a struct page * to a PFN number
108 *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
109 *
110 *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
111 *  virt_addr_valid(k)	indicates whether a virtual address is valid
112 */
113#define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
114
115#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
116#define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && \
117		(unsigned long)(kaddr) < (unsigned long)high_memory)
118
119#endif
120
121#include <asm-generic/memory_model.h>
122
123#endif