arch/microblaze/include/asm/page.h

   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 #if defined(CONFIG_MICROBLAZE_64K_PAGES)
  24 #define PAGE_SHIFT              16
  25 #elif defined(CONFIG_MICROBLAZE_16K_PAGES)
  26 #define PAGE_SHIFT              14
  27 #else
  28 #define PAGE_SHIFT              12
  29 #endif
  30 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
  31 #define PAGE_MASK       (~(PAGE_SIZE-1))
  32
  33 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
  34
  35 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  36
  37 #ifndef __ASSEMBLY__
  38
  39 /* MS be sure that SLAB allocates aligned objects */
  40 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
  41
  42 #define ARCH_SLAB_MINALIGN      L1_CACHE_BYTES
  43
  44 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
  45 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
  46
  47 #ifndef CONFIG_MMU
  48 /*
  49  * PAGE_OFFSET -- the first address of the first page of memory. When not
  50  * using MMU this corresponds to the first free page in physical memory (aligned
  51  * on a page boundary).
  52  */
  53 extern unsigned int __page_offset;
  54 #define PAGE_OFFSET __page_offset
  55
  56 #else /* CONFIG_MMU */
  57
  58 /*
  59  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  60  * it is set to the kernel start address (aligned on a page boundary).
  61  *
  62  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  63  * in arch/microblaze/Makefile.
  64  */
  65 #define PAGE_OFFSET     CONFIG_KERNEL_START
  66
  67 /*
  68  * The basic type of a PTE - 32 bit physical addressing.
  69  */
  70 typedef unsigned long pte_basic_t;
  71 #define PTE_FMT         "%.8lx"
  72
  73 #endif /* CONFIG_MMU */
  74
  75 # define copy_page(to, from)                    memcpy((to), (from), PAGE_SIZE)
  76 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  77
  78 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  79 # define copy_user_page(vto, vfrom, vaddr, topg) \
  80                         memcpy((vto), (vfrom), PAGE_SIZE)
  81
  82 /*
  83  * These are used to make use of C type-checking..
  84  */
  85 typedef struct page *pgtable_t;
  86 typedef struct { unsigned long  pte; }          pte_t;
  87 typedef struct { unsigned long  pgprot; }       pgprot_t;
  88 /* FIXME this can depend on linux kernel version */
  89 #   ifdef CONFIG_MMU
  90 typedef struct { unsigned long pgd; } pgd_t;
  91 #   else /* CONFIG_MMU */
  92 typedef struct { unsigned long  ste[64]; }      pmd_t;
  93 typedef struct { pmd_t          pue[1]; }       pud_t;
  94 typedef struct { pud_t          p4e[1]; }       p4d_t;
  95 typedef struct { p4d_t          pge[1]; }       pgd_t;
  96 #   endif /* CONFIG_MMU */
  97
  98 # define pte_val(x)     ((x).pte)
  99 # define pgprot_val(x)  ((x).pgprot)
 100
 101 #   ifdef CONFIG_MMU
 102 #   define pgd_val(x)      ((x).pgd)
 103 #   else  /* CONFIG_MMU */
 104 #   define pmd_val(x)   ((x).ste[0])
 105 #   define pud_val(x)   ((x).pue[0])
 106 #   define pgd_val(x)   ((x).pge[0])
 107 #   endif  /* CONFIG_MMU */
 108
 109 # define __pte(x)       ((pte_t) { (x) })
 110 # define __pgd(x)       ((pgd_t) { (x) })
 111 # define __pgprot(x)    ((pgprot_t) { (x) })
 112
 113 /**
 114  * Conversions for virtual address, physical address, pfn, and struct
 115  * page are defined in the following files.
 116  *
 117  * virt -+
 118  *       | asm-microblaze/page.h
 119  * phys -+
 120  *       | linux/pfn.h
 121  *  pfn -+
 122  *       | asm-generic/memory_model.h
 123  * page -+
 124  *
 125  */
 126
 127 extern unsigned long max_low_pfn;
 128 extern unsigned long min_low_pfn;
 129 extern unsigned long max_pfn;
 130
 131 extern unsigned long memory_start;
 132 extern unsigned long memory_size;
 133 extern unsigned long lowmem_size;
 134
 135 extern unsigned long kernel_tlb;
 136
 137 extern int page_is_ram(unsigned long pfn);
 138
 139 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
 140 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
 141
 142 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
 143 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
 144
 145 #  ifdef CONFIG_MMU
 146
 147 #  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 148 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 149 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
 150
 151 #  else /* CONFIG_MMU */
 152 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
 153 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
 154 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
 155 #  define page_to_bus(page)     (page_to_phys(page))
 156 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
 157 #  endif /* CONFIG_MMU */
 158
 159 #  ifndef CONFIG_MMU
 160 #  define pfn_valid(pfn)        (((pfn) >= min_low_pfn) && \
 161                                 ((pfn) <= (min_low_pfn + max_mapnr)))
 162 #  define ARCH_PFN_OFFSET       (PAGE_OFFSET >> PAGE_SHIFT)
 163 #  else /* CONFIG_MMU */
 164 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 165 #  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
 166 #  endif /* CONFIG_MMU */
 167
 168 # endif /* __ASSEMBLY__ */
 169
 170 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 171
 172 # define __pa(x)        __virt_to_phys((unsigned long)(x))
 173 # define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
 174
 175 /* Convert between virtual and physical address for MMU. */
 176 /* Handle MicroBlaze processor with virtual memory. */
 177 #ifndef CONFIG_MMU
 178 #define __virt_to_phys(addr)    addr
 179 #define __phys_to_virt(addr)    addr
 180 #define tophys(rd, rs)  addik rd, rs, 0
 181 #define tovirt(rd, rs)  addik rd, rs, 0
 182 #else
 183 #define __virt_to_phys(addr) \
 184         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 185 #define __phys_to_virt(addr) \
 186         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 187 #define tophys(rd, rs) \
 188         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 189 #define tovirt(rd, rs) \
 190         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 191 #endif /* CONFIG_MMU */
 192
 193 #define TOPHYS(addr)  __virt_to_phys(addr)
 194
 195 #ifdef CONFIG_MMU
 196
 197 #endif /* CONFIG_MMU */
 198
 199 #endif /* __KERNEL__ */
 200
 201 #include <asm-generic/memory_model.h>
 202 #include <asm-generic/getorder.h>
 203
 204 #endif /* _ASM_MICROBLAZE_PAGE_H */