text: /*
   * linux/arch/unicore32/include/asm/memory.h
   *
   * Code specific to PKUnity SoC and UniCore ISA
   *
   * Copyright (C) 2001-2010 GUAN Xue-tao
   *
   * 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.
   *
   *  Note: this file should not be included by non-asm/.h files
   */
  #ifndef __UNICORE_MEMORY_H__
  #define __UNICORE_MEMORY_H__
  
  #include <linux/compiler.h>
  #include <linux/const.h>
  #include <asm/sizes.h>
  #include <mach/memory.h>
  
  /*
   * PAGE_OFFSET - the virtual address of the start of the kernel image
   * TASK_SIZE - the maximum size of a user space task.
   * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
   */
  #define PAGE_OFFSET		UL(0xC0000000)
  #define TASK_SIZE		(PAGE_OFFSET - UL(0x41000000))
  #define TASK_UNMAPPED_BASE	(PAGE_OFFSET / 3)
  
  /*
   * The module space lives between the addresses given by TASK_SIZE
   * and PAGE_OFFSET - it must be within 32MB of the kernel text.
   */
  #define MODULES_VADDR		(PAGE_OFFSET - 16*1024*1024)
  #if TASK_SIZE > MODULES_VADDR
  #error Top of user space clashes with start of module space
  #endif
  
  #define MODULES_END		(PAGE_OFFSET)
  
  /*
   * Allow 16MB-aligned ioremap pages
   */
  #define IOREMAP_MAX_ORDER	24
  
  /*
   * Physical vs virtual RAM address space conversion.  These are
   * private definitions which should NOT be used outside memory.h
   * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
   */
  #ifndef __virt_to_phys
  #define __virt_to_phys(x)	((x) - PAGE_OFFSET + PHYS_OFFSET)
  #define __phys_to_virt(x)	((x) - PHYS_OFFSET + PAGE_OFFSET)
  #endif
  
  /*
   * Convert a page to/from a physical address
   */
  #define page_to_phys(page)	(__pfn_to_phys(page_to_pfn(page)))
  #define phys_to_page(phys)	(pfn_to_page(__phys_to_pfn(phys)))
  
  #ifndef __ASSEMBLY__
  
  #ifndef arch_adjust_zones
  #define arch_adjust_zones(size, holes) do { } while (0)
  #endif
  
  /*
   * PFNs are used to describe any physical page; this means
   * PFN 0 == physical address 0.
   *
   * This is the PFN of the first RAM page in the kernel
   * direct-mapped view.  We assume this is the first page
   * of RAM in the mem_map as well.
   */
  #define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
  
  /*
   * Drivers should NOT use these either.
   */
  #define __pa(x)			__virt_to_phys((unsigned long)(x))
  #define __va(x)			((void *)__phys_to_virt((unsigned long)(x)))
  #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
  
  /*
   * Conversion between a struct page and a physical address.
   *
   *  page_to_pfn(page)	convert a struct page * to a PFN number
   *  pfn_to_page(pfn)	convert a _valid_ PFN number to struct page *
   *
   *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
   *  virt_addr_valid(k)	indicates whether a virtual address is valid
   */
  #define ARCH_PFN_OFFSET		PHYS_PFN_OFFSET
  
  #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  #define virt_addr_valid(kaddr)	((unsigned long)(kaddr) >= PAGE_OFFSET && \
  		(unsigned long)(kaddr) < (unsigned long)high_memory)
  
  #endif
  
  #include <asm-generic/memory_model.h>
  
  #endif
  