LXR linux/arch/nds32/include/asm/memory.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2// Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4#ifndef __ASM_NDS32_MEMORY_H
   5#define __ASM_NDS32_MEMORY_H
   6
   7#include <linux/compiler.h>
   8#include <linux/sizes.h>
   9
  10#ifndef __ASSEMBLY__
  11#include <asm/page.h>
  12#endif
  13
  14#ifndef PHYS_OFFSET
  15#define PHYS_OFFSET     (0x0)
  16#endif
  17
  18/*
  19 * TASK_SIZE - the maximum size of a user space task.
  20 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  21 */
  22#define TASK_SIZE               ((CONFIG_PAGE_OFFSET) - (SZ_32M))
  23#define TASK_UNMAPPED_BASE      ALIGN(TASK_SIZE / 3, SZ_32M)
  24#define PAGE_OFFSET             (CONFIG_PAGE_OFFSET)
  25
  26/*
  27 * Physical vs virtual RAM address space conversion.  These are
  28 * private definitions which should NOT be used outside memory.h
  29 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  30 */
  31#ifndef __virt_to_phys
  32#define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
  33#define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
  34#endif
  35
  36/*
  37 * The module space lives between the addresses given by TASK_SIZE
  38 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  39 */
  40#define MODULES_END     (PAGE_OFFSET)
  41#define MODULES_VADDR   (MODULES_END - SZ_32M)
  42
  43#if TASK_SIZE > MODULES_VADDR
  44#error Top of user space clashes with start of module space
  45#endif
  46
  47#ifndef __ASSEMBLY__
  48
  49/*
  50 * PFNs are used to describe any physical page; this means
  51 * PFN 0 == physical address 0.
  52 *
  53 * This is the PFN of the first RAM page in the kernel
  54 * direct-mapped view.  We assume this is the first page
  55 * of RAM in the mem_map as well.
  56 */
  57#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  58
  59/*
  60 * Drivers should NOT use these either.
  61 */
  62#define __pa(x)                 __virt_to_phys((unsigned long)(x))
  63#define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
  64
  65/*
  66 * Conversion between a struct page and a physical address.
  67 *
  68 * Note: when converting an unknown physical address to a
  69 * struct page, the resulting pointer must be validated
  70 * using VALID_PAGE().  It must return an invalid struct page
  71 * for any physical address not corresponding to a system
  72 * RAM address.
  73 *
  74 *  pfn_valid(pfn)      indicates whether a PFN number is valid
  75 *
  76 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
  77 *  virt_addr_valid(k)  indicates whether a virtual address is valid
  78 */
  79#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
  80#define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
  81
  82#define virt_to_page(kaddr)     (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
  83#define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
  84
  85#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
  86
  87#endif
  88
  89#include <asm-generic/memory_model.h>
  90
  91#endif
  92