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 #define PAGE_SHIFT (12) 27 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 28 #define PAGE_MASK (~(PAGE_SIZE-1)) 29 30 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR)) 31 32 #ifndef __ASSEMBLY__ 33 34 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) 35 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) 36 37 /* align addr on a size boundary - adjust address up/down if needed */ 38 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1))) 39 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1))) 40 41 /* align addr on a size boundary - adjust address up if needed */ 42 #define _ALIGN(addr, size) _ALIGN_UP(addr, size) 43 44 #ifndef CONFIG_MMU 45 /* 46 * PAGE_OFFSET -- the first address of the first page of memory. When not 47 * using MMU this corresponds to the first free page in physical memory (aligned 48 * on a page boundary). 49 */ 50 extern unsigned int __page_offset; 51 #define PAGE_OFFSET __page_offset 52 53 #else /* CONFIG_MMU */ 54 55 /* 56 * PAGE_OFFSET -- the first address of the first page of memory. With MMU 57 * it is set to the kernel start address (aligned on a page boundary). 58 * 59 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used 60 * in arch/microblaze/Makefile. 61 */ 62 #define PAGE_OFFSET CONFIG_KERNEL_START 63 64 /* 65 * The basic type of a PTE - 32 bit physical addressing. 66 */ 67 typedef unsigned long pte_basic_t; 68 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 69 #define PTE_FMT "%.8lx" 70 71 #endif /* CONFIG_MMU */ 72 73 # ifndef CONFIG_MMU 74 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 75 # define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 76 # define free_user_page(page, addr) free_page(addr) 77 # else /* CONFIG_MMU */ 78 extern void copy_page(void *to, void *from); 79 # endif /* CONFIG_MMU */ 80 81 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 82 83 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 84 # define copy_user_page(vto, vfrom, vaddr, topg) \ 85 memcpy((vto), (vfrom), PAGE_SIZE) 86 87 /* 88 * These are used to make use of C type-checking.. 89 */ 90 typedef struct page *pgtable_t; 91 typedef struct { unsigned long pte; } pte_t; 92 typedef struct { unsigned long pgprot; } pgprot_t; 93 /* FIXME this can depend on linux kernel version */ 94 # ifdef CONFIG_MMU 95 typedef struct { unsigned long pmd; } pmd_t; 96 typedef struct { unsigned long pgd; } pgd_t; 97 # else /* CONFIG_MMU */ 98 typedef struct { unsigned long ste[64]; } pmd_t; 99 typedef struct { pmd_t pue[1]; } pud_t; 100 typedef struct { pud_t pge[1]; } pgd_t; 101 # endif /* CONFIG_MMU */ 102 103 # define pte_val(x) ((x).pte) 104 # define pgprot_val(x) ((x).pgprot) 105 106 # ifdef CONFIG_MMU 107 # define pmd_val(x) ((x).pmd) 108 # define pgd_val(x) ((x).pgd) 109 # else /* CONFIG_MMU */ 110 # define pmd_val(x) ((x).ste[0]) 111 # define pud_val(x) ((x).pue[0]) 112 # define pgd_val(x) ((x).pge[0]) 113 # endif /* CONFIG_MMU */ 114 115 # define __pte(x) ((pte_t) { (x) }) 116 # define __pmd(x) ((pmd_t) { (x) }) 117 # define __pgd(x) ((pgd_t) { (x) }) 118 # define __pgprot(x) ((pgprot_t) { (x) }) 119 120 /** 121 * Conversions for virtual address, physical address, pfn, and struct 122 * page are defined in the following files. 123 * 124 * virt -+ 125 * | asm-microblaze/page.h 126 * phys -+ 127 * | linux/pfn.h 128 * pfn -+ 129 * | asm-generic/memory_model.h 130 * page -+ 131 * 132 */ 133 134 extern unsigned long max_low_pfn; 135 extern unsigned long min_low_pfn; 136 extern unsigned long max_pfn; 137 138 extern unsigned long memory_start; 139 extern unsigned long memory_end; 140 extern unsigned long memory_size; 141 142 extern int page_is_ram(unsigned long pfn); 143 144 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 145 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 146 147 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 148 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 149 150 # ifdef CONFIG_MMU 151 152 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 153 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 154 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 155 156 # else /* CONFIG_MMU */ 157 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 158 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 159 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 160 # define page_to_bus(page) (page_to_phys(page)) 161 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 162 # endif /* CONFIG_MMU */ 163 164 # ifndef CONFIG_MMU 165 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 166 ((pfn) <= (min_low_pfn + max_mapnr))) 167 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 168 # else /* CONFIG_MMU */ 169 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 170 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 171 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 172 # endif /* CONFIG_MMU */ 173 174 # endif /* __ASSEMBLY__ */ 175 176 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 177 178 179 # ifndef CONFIG_MMU 180 # define __pa(vaddr) ((unsigned long) (vaddr)) 181 # define __va(paddr) ((void *) (paddr)) 182 # else /* CONFIG_MMU */ 183 # define __pa(x) __virt_to_phys((unsigned long)(x)) 184 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 185 # endif /* CONFIG_MMU */ 186 187 188 /* Convert between virtual and physical address for MMU. */ 189 /* Handle MicroBlaze processor with virtual memory. */ 190 #ifndef CONFIG_MMU 191 #define __virt_to_phys(addr) addr 192 #define __phys_to_virt(addr) addr 193 #define tophys(rd, rs) addik rd, rs, 0 194 #define tovirt(rd, rs) addik rd, rs, 0 195 #else 196 #define __virt_to_phys(addr) \ 197 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 198 #define __phys_to_virt(addr) \ 199 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 200 #define tophys(rd, rs) \ 201 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 202 #define tovirt(rd, rs) \ 203 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 204 #endif /* CONFIG_MMU */ 205 206 #define TOPHYS(addr) __virt_to_phys(addr) 207 208 #ifdef CONFIG_MMU 209 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC 210 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */ 211 #endif 212 213 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 214 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 215 #endif /* CONFIG_MMU */ 216 217 #endif /* __KERNEL__ */ 218 219 #include <asm-generic/memory_model.h> 220 #include <asm-generic/getorder.h> 221 222 #endif /* _ASM_MICROBLAZE_PAGE_H */ 223