arch/unicore32/include/asm/memory.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * linux/arch/unicore32/include/asm/memory.h
   4  *
   5  * Code specific to PKUnity SoC and UniCore ISA
   6  *
   7  * Copyright (C) 2001-2010 GUAN Xue-tao
   8  *
   9  *  Note: this file should not be included by non-asm/.h files
  10  */
  11 #ifndef __UNICORE_MEMORY_H__
  12 #define __UNICORE_MEMORY_H__
  13
  14 #include <linux/compiler.h>
  15 #include <linux/const.h>
  16 #include <linux/sizes.h>
  17 #include <mach/memory.h>
  18
  19 /*
  20  * PAGE_OFFSET - the virtual address of the start of the kernel image
  21  * TASK_SIZE - the maximum size of a user space task.
  22  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area
  23  */
  24 #define PAGE_OFFSET             UL(0xC0000000)
  25 #define TASK_SIZE               (PAGE_OFFSET - UL(0x41000000))
  26 #define TASK_UNMAPPED_BASE      (PAGE_OFFSET / 3)
  27
  28 /*
  29  * The module space lives between the addresses given by TASK_SIZE
  30  * and PAGE_OFFSET - it must be within 32MB of the kernel text.
  31  */
  32 #define MODULES_VADDR           (PAGE_OFFSET - 16*1024*1024)
  33 #if TASK_SIZE > MODULES_VADDR
  34 #error Top of user space clashes with start of module space
  35 #endif
  36
  37 #define MODULES_END             (PAGE_OFFSET)
  38
  39 /*
  40  * Allow 16MB-aligned ioremap pages
  41  */
  42 #define IOREMAP_MAX_ORDER       24
  43
  44 /*
  45  * Physical vs virtual RAM address space conversion.  These are
  46  * private definitions which should NOT be used outside memory.h
  47  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  48  */
  49 #ifndef __virt_to_phys
  50 #define __virt_to_phys(x)       ((x) - PAGE_OFFSET + PHYS_OFFSET)
  51 #define __phys_to_virt(x)       ((x) - PHYS_OFFSET + PAGE_OFFSET)
  52 #endif
  53
  54 /*
  55  * Convert a page to/from a physical address
  56  */
  57 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
  58 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
  59
  60 #ifndef __ASSEMBLY__
  61
  62 #ifndef arch_adjust_zones
  63 #define arch_adjust_zones(size, holes) do { } while (0)
  64 #endif
  65
  66 /*
  67  * PFNs are used to describe any physical page; this means
  68  * PFN 0 == physical address 0.
  69  *
  70  * This is the PFN of the first RAM page in the kernel
  71  * direct-mapped view.  We assume this is the first page
  72  * of RAM in the mem_map as well.
  73  */
  74 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
  75
  76 /*
  77  * Drivers should NOT use these either.
  78  */
  79 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
  80 #define __va(x)                 ((void *)__phys_to_virt((unsigned long)(x)))
  81 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
  82
  83 /*
  84  * Conversion between a struct page and a physical address.
  85  *
  86  *  page_to_pfn(page)   convert a struct page * to a PFN number
  87  *  pfn_to_page(pfn)    convert a _valid_ PFN number to struct page *
  88  *
  89  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
  90  *  virt_addr_valid(k)  indicates whether a virtual address is valid
  91  */
  92 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
  93
  94 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
  95 #define virt_addr_valid(kaddr)  ((unsigned long)(kaddr) >= PAGE_OFFSET && \
  96                 (unsigned long)(kaddr) < (unsigned long)high_memory)
  97
  98 #endif
  99
 100 #include <asm-generic/memory_model.h>
 101
 102 #endif