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#ifndef __virt_to_bus
  19#define __virt_to_bus   __virt_to_phys
  20#endif
  21
  22#ifndef __bus_to_virt
  23#define __bus_to_virt   __phys_to_virt
  24#endif
  25
  26/*
  27 * TASK_SIZE - the maximum size of a user space task.
  28 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  29 */
  30#define TASK_SIZE               ((CONFIG_PAGE_OFFSET) - (SZ_32M))
  31#define TASK_UNMAPPED_BASE      ALIGN(TASK_SIZE / 3, SZ_32M)
  32#define PAGE_OFFSET             (CONFIG_PAGE_OFFSET)
  33
  34/*
  35 * Physical vs virtual RAM address space conversion.  These are
  36 * private definitions which should NOT be used outside memory.h
  37 * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  38 */
  39#ifndef __virt_to_phys
  40#define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
  41#define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
  42#endif
  43
  44/*
  45 * The module space lives between the addresses given by TASK_SIZE
  46 * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  47 */
  48#define MODULES_END     (PAGE_OFFSET)
  49#define MODULES_VADDR   (MODULES_END - SZ_32M)
  50
  51#if TASK_SIZE > MODULES_VADDR
  52#error Top of user space clashes with start of module space
  53#endif
  54
  55#ifndef __ASSEMBLY__
  56
  57/*
  58 * PFNs are used to describe any physical page; this means
  59 * PFN 0 == physical address 0.
  60 *
  61 * This is the PFN of the first RAM page in the kernel
  62 * direct-mapped view.  We assume this is the first page
  63 * of RAM in the mem_map as well.
  64 */
  65#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  66
  67/*
  68 * Drivers should NOT use these either.
  69 */
  70#define __pa(x)                 __virt_to_phys((unsigned long)(x))
  71#define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
  72
  73/*
  74 * Conversion between a struct page and a physical address.
  75 *
  76 * Note: when converting an unknown physical address to a
  77 * struct page, the resulting pointer must be validated
  78 * using VALID_PAGE().  It must return an invalid struct page
  79 * for any physical address not corresponding to a system
  80 * RAM address.
  81 *
  82 *  pfn_valid(pfn)      indicates whether a PFN number is valid
  83 *
  84 *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
  85 *  virt_addr_valid(k)  indicates whether a virtual address is valid
  86 */
  87#ifndef CONFIG_DISCONTIGMEM
  88
  89#define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
  90#define pfn_valid(pfn)          ((pfn) >= PHYS_PFN_OFFSET && (pfn) < (PHYS_PFN_OFFSET + max_mapnr))
  91
  92#define virt_to_page(kaddr)     (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
  93#define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && (unsigned long)(kaddr) < (unsigned long)high_memory)
  94
  95#else /* CONFIG_DISCONTIGMEM */
  96#error CONFIG_DISCONTIGMEM is not supported yet.
  97#endif /* !CONFIG_DISCONTIGMEM */
  98
  99#define page_to_phys(page)      (page_to_pfn(page) << PAGE_SHIFT)
 100
 101#endif
 102
 103#include <asm-generic/memory_model.h>
 104
 105#endif
 106