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 #include <vdso/page.h>
  23
  24 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
  25
  26 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
  27
  28 #ifndef __ASSEMBLY__
  29
  30 /*
  31  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
  32  * it is set to the kernel start address (aligned on a page boundary).
  33  *
  34  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
  35  * in arch/microblaze/Makefile.
  36  */
  37 #define PAGE_OFFSET     CONFIG_KERNEL_START
  38
  39 /*
  40  * The basic type of a PTE - 32 bit physical addressing.
  41  */
  42 typedef unsigned long pte_basic_t;
  43 #define PTE_FMT         "%.8lx"
  44
  45 # define copy_page(to, from)                    memcpy((to), (from), PAGE_SIZE)
  46 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
  47
  48 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
  49 # define copy_user_page(vto, vfrom, vaddr, topg) \
  50                         memcpy((vto), (vfrom), PAGE_SIZE)
  51
  52 /*
  53  * These are used to make use of C type-checking..
  54  */
  55 typedef struct page *pgtable_t;
  56 typedef struct { unsigned long  pte; }          pte_t;
  57 typedef struct { unsigned long  pgprot; }       pgprot_t;
  58 /* FIXME this can depend on linux kernel version */
  59 typedef struct { unsigned long pgd; } pgd_t;
  60
  61 # define pte_val(x)     ((x).pte)
  62 # define pgprot_val(x)  ((x).pgprot)
  63
  64 #   define pgd_val(x)      ((x).pgd)
  65
  66 # define __pte(x)       ((pte_t) { (x) })
  67 # define __pgd(x)       ((pgd_t) { (x) })
  68 # define __pgprot(x)    ((pgprot_t) { (x) })
  69
  70 /**
  71  * Conversions for virtual address, physical address, pfn, and struct
  72  * page are defined in the following files.
  73  *
  74  * virt -+
  75  *       | asm-microblaze/page.h
  76  * phys -+
  77  *       | linux/pfn.h
  78  *  pfn -+
  79  *       | asm-generic/memory_model.h
  80  * page -+
  81  *
  82  */
  83
  84 extern unsigned long max_low_pfn;
  85 extern unsigned long min_low_pfn;
  86 extern unsigned long max_pfn;
  87
  88 extern unsigned long memory_start;
  89 extern unsigned long memory_size;
  90 extern unsigned long lowmem_size;
  91
  92 extern unsigned long kernel_tlb;
  93
  94 extern int page_is_ram(unsigned long pfn);
  95
  96 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
  97 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
  98
  99 #  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
 100 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
 101
 102 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
 103 # endif /* __ASSEMBLY__ */
 104
 105 /* Convert between virtual and physical address for MMU. */
 106 /* Handle MicroBlaze processor with virtual memory. */
 107 #define __virt_to_phys(addr) \
 108         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 109 #define __phys_to_virt(addr) \
 110         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 111 #define tophys(rd, rs) \
 112         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
 113 #define tovirt(rd, rs) \
 114         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
 115
 116 #ifndef __ASSEMBLY__
 117
 118 # define __pa(x)        __virt_to_phys((unsigned long)(x))
 119 # define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
 120
 121 static inline unsigned long virt_to_pfn(const void *vaddr)
 122 {
 123         return phys_to_pfn(__pa(vaddr));
 124 }
 125
 126 static inline const void *pfn_to_virt(unsigned long pfn)
 127 {
 128         return __va(pfn_to_phys((pfn)));
 129 }
 130
 131 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
 132
 133 #endif /* __ASSEMBLY__ */
 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 */