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 * MAP_NR -- given an address, calculate the index of the page struct which 66 * points to the address's page. 67 */ 68 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT) 69 70 /* 71 * The basic type of a PTE - 32 bit physical addressing. 72 */ 73 typedef unsigned long pte_basic_t; 74 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 75 #define PTE_FMT "%.8lx" 76 77 #endif /* CONFIG_MMU */ 78 79 # ifndef CONFIG_MMU 80 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 81 # define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 82 # define free_user_page(page, addr) free_page(addr) 83 # else /* CONFIG_MMU */ 84 extern void copy_page(void *to, void *from); 85 # endif /* CONFIG_MMU */ 86 87 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 88 89 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 90 # define copy_user_page(vto, vfrom, vaddr, topg) \ 91 memcpy((vto), (vfrom), PAGE_SIZE) 92 93 /* 94 * These are used to make use of C type-checking.. 95 */ 96 typedef struct page *pgtable_t; 97 typedef struct { unsigned long pte; } pte_t; 98 typedef struct { unsigned long pgprot; } pgprot_t; 99 /* FIXME this can depend on linux kernel version */ 100 # ifdef CONFIG_MMU 101 typedef struct { unsigned long pmd; } pmd_t; 102 typedef struct { unsigned long pgd; } pgd_t; 103 # else /* CONFIG_MMU */ 104 typedef struct { unsigned long ste[64]; } pmd_t; 105 typedef struct { pmd_t pue[1]; } pud_t; 106 typedef struct { pud_t pge[1]; } pgd_t; 107 # endif /* CONFIG_MMU */ 108 109 # define pte_val(x) ((x).pte) 110 # define pgprot_val(x) ((x).pgprot) 111 112 # ifdef CONFIG_MMU 113 # define pmd_val(x) ((x).pmd) 114 # define pgd_val(x) ((x).pgd) 115 # else /* CONFIG_MMU */ 116 # define pmd_val(x) ((x).ste[0]) 117 # define pud_val(x) ((x).pue[0]) 118 # define pgd_val(x) ((x).pge[0]) 119 # endif /* CONFIG_MMU */ 120 121 # define __pte(x) ((pte_t) { (x) }) 122 # define __pmd(x) ((pmd_t) { (x) }) 123 # define __pgd(x) ((pgd_t) { (x) }) 124 # define __pgprot(x) ((pgprot_t) { (x) }) 125 126 /** 127 * Conversions for virtual address, physical address, pfn, and struct 128 * page are defined in the following files. 129 * 130 * virt -+ 131 * | asm-microblaze/page.h 132 * phys -+ 133 * | linux/pfn.h 134 * pfn -+ 135 * | asm-generic/memory_model.h 136 * page -+ 137 * 138 */ 139 140 extern unsigned long max_low_pfn; 141 extern unsigned long min_low_pfn; 142 extern unsigned long max_pfn; 143 144 extern unsigned long memory_start; 145 extern unsigned long memory_end; 146 extern unsigned long memory_size; 147 148 extern int page_is_ram(unsigned long pfn); 149 150 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 151 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 152 153 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 154 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 155 156 # ifdef CONFIG_MMU 157 # define virt_to_page(kaddr) (mem_map + MAP_NR(kaddr)) 158 # else /* CONFIG_MMU */ 159 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 160 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 161 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 162 # define page_to_bus(page) (page_to_phys(page)) 163 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 164 # endif /* CONFIG_MMU */ 165 166 # ifndef CONFIG_MMU 167 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 168 ((pfn) <= (min_low_pfn + max_mapnr))) 169 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 170 # else /* CONFIG_MMU */ 171 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 172 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 173 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 174 # endif /* CONFIG_MMU */ 175 176 # endif /* __ASSEMBLY__ */ 177 178 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 179 180 181 # ifndef CONFIG_MMU 182 # define __pa(vaddr) ((unsigned long) (vaddr)) 183 # define __va(paddr) ((void *) (paddr)) 184 # else /* CONFIG_MMU */ 185 # define __pa(x) __virt_to_phys((unsigned long)(x)) 186 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 187 # endif /* CONFIG_MMU */ 188 189 190 /* Convert between virtual and physical address for MMU. */ 191 /* Handle MicroBlaze processor with virtual memory. */ 192 #ifndef CONFIG_MMU 193 #define __virt_to_phys(addr) addr 194 #define __phys_to_virt(addr) addr 195 #define tophys(rd, rs) addik rd, rs, 0 196 #define tovirt(rd, rs) addik rd, rs, 0 197 #else 198 #define __virt_to_phys(addr) \ 199 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 200 #define __phys_to_virt(addr) \ 201 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 202 #define tophys(rd, rs) \ 203 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 204 #define tovirt(rd, rs) \ 205 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 206 #endif /* CONFIG_MMU */ 207 208 #define TOPHYS(addr) __virt_to_phys(addr) 209 210 #ifdef CONFIG_MMU 211 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC 212 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */ 213 #endif 214 215 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 216 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 217 #endif /* CONFIG_MMU */ 218 219 #endif /* __KERNEL__ */ 220 221 #include <asm-generic/memory_model.h> 222 #include <asm-generic/getorder.h> 223 224 #endif /* _ASM_MICROBLAZE_PAGE_H */ 225