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