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Linux/arch/microblaze/include/asm/page.h

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  1 /*
  2  * VM ops
  3  *
  4  * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
  5  * Copyright (C) 2008-2009 PetaLogix
  6  * Copyright (C) 2006 Atmark Techno, Inc.
  7  * Changes for MMU support:
  8  *    Copyright (C) 2007 Xilinx, Inc.  All rights reserved.
  9  *
 10  * This file is subject to the terms and conditions of the GNU General Public
 11  * License. See the file "COPYING" in the main directory of this archive
 12  * for more details.
 13  */
 14 
 15 #ifndef _ASM_MICROBLAZE_PAGE_H
 16 #define _ASM_MICROBLAZE_PAGE_H
 17 
 18 #include <linux/pfn.h>
 19 #include <asm/setup.h>
 20 #include <asm/asm-compat.h>
 21 #include <linux/const.h>
 22 
 23 #ifdef __KERNEL__
 24 
 25 /* PAGE_SHIFT determines the page size */
 26 #if defined(CONFIG_MICROBLAZE_64K_PAGES)
 27 #define PAGE_SHIFT              16
 28 #elif defined(CONFIG_MICROBLAZE_16K_PAGES)
 29 #define PAGE_SHIFT              14
 30 #else
 31 #define PAGE_SHIFT              12
 32 #endif
 33 #define PAGE_SIZE       (ASM_CONST(1) << PAGE_SHIFT)
 34 #define PAGE_MASK       (~(PAGE_SIZE-1))
 35 
 36 #define LOAD_OFFSET     ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR))
 37 
 38 #define PTE_SHIFT       (PAGE_SHIFT - 2)        /* 1024 ptes per page */
 39 
 40 #ifndef __ASSEMBLY__
 41 
 42 /* MS be sure that SLAB allocates aligned objects */
 43 #define ARCH_DMA_MINALIGN       L1_CACHE_BYTES
 44 
 45 #define ARCH_SLAB_MINALIGN      L1_CACHE_BYTES
 46 
 47 #define PAGE_UP(addr)   (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1)))
 48 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1)))
 49 
 50 #ifndef CONFIG_MMU
 51 /*
 52  * PAGE_OFFSET -- the first address of the first page of memory. When not
 53  * using MMU this corresponds to the first free page in physical memory (aligned
 54  * on a page boundary).
 55  */
 56 extern unsigned int __page_offset;
 57 #define PAGE_OFFSET __page_offset
 58 
 59 #else /* CONFIG_MMU */
 60 
 61 /*
 62  * PAGE_OFFSET -- the first address of the first page of memory. With MMU
 63  * it is set to the kernel start address (aligned on a page boundary).
 64  *
 65  * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used
 66  * in arch/microblaze/Makefile.
 67  */
 68 #define PAGE_OFFSET     CONFIG_KERNEL_START
 69 
 70 /*
 71  * The basic type of a PTE - 32 bit physical addressing.
 72  */
 73 typedef unsigned long pte_basic_t;
 74 #define PTE_FMT         "%.8lx"
 75 
 76 #endif /* CONFIG_MMU */
 77 
 78 # define copy_page(to, from)                    memcpy((to), (from), PAGE_SIZE)
 79 # define clear_page(pgaddr)                     memset((pgaddr), 0, PAGE_SIZE)
 80 
 81 # define clear_user_page(pgaddr, vaddr, page)   memset((pgaddr), 0, PAGE_SIZE)
 82 # define copy_user_page(vto, vfrom, vaddr, topg) \
 83                         memcpy((vto), (vfrom), PAGE_SIZE)
 84 
 85 /*
 86  * These are used to make use of C type-checking..
 87  */
 88 typedef struct page *pgtable_t;
 89 typedef struct { unsigned long  pte; }          pte_t;
 90 typedef struct { unsigned long  pgprot; }       pgprot_t;
 91 /* FIXME this can depend on linux kernel version */
 92 #   ifdef CONFIG_MMU
 93 typedef struct { unsigned long pmd; } pmd_t;
 94 typedef struct { unsigned long pgd; } pgd_t;
 95 #   else /* CONFIG_MMU */
 96 typedef struct { unsigned long  ste[64]; }      pmd_t;
 97 typedef struct { pmd_t          pue[1]; }       pud_t;
 98 typedef struct { pud_t          p4e[1]; }       p4d_t;
 99 typedef struct { p4d_t          pge[1]; }       pgd_t;
100 #   endif /* CONFIG_MMU */
101 
102 # define pte_val(x)     ((x).pte)
103 # define pgprot_val(x)  ((x).pgprot)
104 
105 #   ifdef CONFIG_MMU
106 #   define pmd_val(x)      ((x).pmd)
107 #   define pgd_val(x)      ((x).pgd)
108 #   else  /* CONFIG_MMU */
109 #   define pmd_val(x)   ((x).ste[0])
110 #   define pud_val(x)   ((x).pue[0])
111 #   define pgd_val(x)   ((x).pge[0])
112 #   endif  /* CONFIG_MMU */
113 
114 # define __pte(x)       ((pte_t) { (x) })
115 # define __pmd(x)       ((pmd_t) { (x) })
116 # define __pgd(x)       ((pgd_t) { (x) })
117 # define __pgprot(x)    ((pgprot_t) { (x) })
118 
119 /**
120  * Conversions for virtual address, physical address, pfn, and struct
121  * page are defined in the following files.
122  *
123  * virt -+
124  *       | asm-microblaze/page.h
125  * phys -+
126  *       | linux/pfn.h
127  *  pfn -+
128  *       | asm-generic/memory_model.h
129  * page -+
130  *
131  */
132 
133 extern unsigned long max_low_pfn;
134 extern unsigned long min_low_pfn;
135 extern unsigned long max_pfn;
136 
137 extern unsigned long memory_start;
138 extern unsigned long memory_size;
139 extern unsigned long lowmem_size;
140 
141 extern unsigned long kernel_tlb;
142 
143 extern int page_is_ram(unsigned long pfn);
144 
145 # define phys_to_pfn(phys)      (PFN_DOWN(phys))
146 # define pfn_to_phys(pfn)       (PFN_PHYS(pfn))
147 
148 # define virt_to_pfn(vaddr)     (phys_to_pfn((__pa(vaddr))))
149 # define pfn_to_virt(pfn)       __va(pfn_to_phys((pfn)))
150 
151 #  ifdef CONFIG_MMU
152 
153 #  define virt_to_page(kaddr)   (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT))
154 #  define page_to_virt(page)   __va(page_to_pfn(page) << PAGE_SHIFT)
155 #  define page_to_phys(page)     (page_to_pfn(page) << PAGE_SHIFT)
156 
157 #  else /* CONFIG_MMU */
158 #  define virt_to_page(vaddr)   (pfn_to_page(virt_to_pfn(vaddr)))
159 #  define page_to_virt(page)    (pfn_to_virt(page_to_pfn(page)))
160 #  define page_to_phys(page)    (pfn_to_phys(page_to_pfn(page)))
161 #  define page_to_bus(page)     (page_to_phys(page))
162 #  define phys_to_page(paddr)   (pfn_to_page(phys_to_pfn(paddr)))
163 #  endif /* CONFIG_MMU */
164 
165 #  ifndef CONFIG_MMU
166 #  define pfn_valid(pfn)        (((pfn) >= min_low_pfn) && \
167                                 ((pfn) <= (min_low_pfn + max_mapnr)))
168 #  define ARCH_PFN_OFFSET       (PAGE_OFFSET >> PAGE_SHIFT)
169 #  else /* CONFIG_MMU */
170 #  define ARCH_PFN_OFFSET       (memory_start >> PAGE_SHIFT)
171 #  define pfn_valid(pfn)        ((pfn) < (max_mapnr + ARCH_PFN_OFFSET))
172 #  endif /* CONFIG_MMU */
173 
174 # endif /* __ASSEMBLY__ */
175 
176 #define virt_addr_valid(vaddr)  (pfn_valid(virt_to_pfn(vaddr)))
177 
178 # define __pa(x)        __virt_to_phys((unsigned long)(x))
179 # define __va(x)        ((void *)__phys_to_virt((unsigned long)(x)))
180 
181 /* Convert between virtual and physical address for MMU. */
182 /* Handle MicroBlaze processor with virtual memory. */
183 #ifndef CONFIG_MMU
184 #define __virt_to_phys(addr)    addr
185 #define __phys_to_virt(addr)    addr
186 #define tophys(rd, rs)  addik rd, rs, 0
187 #define tovirt(rd, rs)  addik rd, rs, 0
188 #else
189 #define __virt_to_phys(addr) \
190         ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
191 #define __phys_to_virt(addr) \
192         ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
193 #define tophys(rd, rs) \
194         addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START)
195 #define tovirt(rd, rs) \
196         addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR)
197 #endif /* CONFIG_MMU */
198 
199 #define TOPHYS(addr)  __virt_to_phys(addr)
200 
201 #ifdef CONFIG_MMU
202 
203 #define VM_DATA_DEFAULT_FLAGS   (VM_READ | VM_WRITE | VM_EXEC | \
204                                  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
205 #endif /* CONFIG_MMU */
206 
207 #endif /* __KERNEL__ */
208 
209 #include <asm-generic/memory_model.h>
210 #include <asm-generic/getorder.h>
211 
212 #endif /* _ASM_MICROBLAZE_PAGE_H */
213 

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