linux/arch/microblaze/include/asm/page.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * VM ops
   4 *
   5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
   6 * Copyright (C) 2008-2009 PetaLogix
   7 * Copyright (C) 2006 Atmark Techno, Inc.
   8 * Changes for MMU support:
   9 *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
  10 */
  11
  12#ifndef _ASM_MICROBLAZE_PAGE_H
  13#define _ASM_MICROBLAZE_PAGE_H
  14
  15#include <linux/pfn.h>
  16#include <asm/setup.h>
  17#include <asm/asm-compat.h>
  18#include <linux/const.h>
  19
  20#ifdef __KERNEL__
  21
  22/* PAGE_SHIFT determines the page size */
  23#define PAGE_SHIFT              12
  24#define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  25#define PAGE_MASK       (~(PAGE_SIZE-1))
  26
  27#define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
  28
  29#define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  30
  31#ifndef __ASSEMBLY__
  32
  33/* MS be sure that SLAB allocates aligned objects */
  34#define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
  35
  36#define ARCH_SLAB_MINALIGN      L1_CACHE_BYTES
  37
  38/*
  39 * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  40 * it is set to the kernel start address (aligned on a page boundary).
  41 *
  42 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  43 * in arch/microblaze/Makefile.
  44 */
  45#define PAGE_OFFSET     CONFIG_KERNEL_START
  46
  47/*
  48 * The basic type of a PTE - 32 bit physical addressing.
  49 */
  50typedef unsigned long pte_basic_t;
  51#define PTE_FMT         "%.8lx"
  52
  53# define copy_page(to, from)                    memcpy((to), (from), PAGE_SIZE)
  54# define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  55
  56# define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  57# define copy_user_page(vto, vfrom, vaddr, topg) \
  58                        memcpy((vto), (vfrom), PAGE_SIZE)
  59
  60/*
  61 * These are used to make use of C type-checking..
  62 */
  63typedef struct page *pgtable_t;
  64typedef struct { unsigned long  pte; }          pte_t;
  65typedef struct { unsigned long  pgprot; }       pgprot_t;
  66/* FIXME this can depend on linux kernel version */
  67typedef struct { unsigned long pgd; } pgd_t;
  68
  69# define pte_val(x)     ((x).pte)
  70# define pgprot_val(x)  ((x).pgprot)
  71
  72#   define pgd_val(x)      ((x).pgd)
  73
  74# define __pte(x)       ((pte_t) { (x) })
  75# define __pgd(x)       ((pgd_t) { (x) })
  76# define __pgprot(x)    ((pgprot_t) { (x) })
  77
  78/**
  79 * Conversions for virtual address, physical address, pfn, and struct
  80 * page are defined in the following files.
  81 *
  82 * virt -+
  83 *       | asm-microblaze/page.h
  84 * phys -+
  85 *       | linux/pfn.h
  86 *  pfn -+
  87 *       | asm-generic/memory_model.h
  88 * page -+
  89 *
  90 */
  91
  92extern unsigned long max_low_pfn;
  93extern unsigned long min_low_pfn;
  94extern unsigned long max_pfn;
  95
  96extern unsigned long memory_start;
  97extern unsigned long memory_size;
  98extern unsigned long lowmem_size;
  99
 100extern unsigned long kernel_tlb;
 101
 102extern int page_is_ram(unsigned long pfn);
 103
 104# define phys_to_pfn(phys)      (PFN_DOWN(phys))
 105# define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 106
 107# define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 108# define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 109
 110#  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 111#  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 112#  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 113
 114#  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 115#  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 116
 117# endif /* __ASSEMBLY__ */
 118
 119#define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 120
 121# define __pa(x)        __virt_to_phys((unsigned long)(x))
 122# define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
 123
 124/* Convert between virtual and physical address for MMU. */
 125/* Handle MicroBlaze processor with virtual memory. */
 126#define __virt_to_phys(addr) \
 127        ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 128#define __phys_to_virt(addr) \
 129        ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 130#define tophys(rd, rs) \
 131        addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 132#define tovirt(rd, rs) \
 133        addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 134
 135#define TOPHYS(addr)  __virt_to_phys(addr)
 136
 137#endif /* __KERNEL__ */
 138
 139#include <asm-generic/memory_model.h>
 140#include <asm-generic/getorder.h>
 141
 142#endif /* _ASM_MICROBLAZE_PAGE_H */
 143
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