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 <linux/const.h> 21 22 #ifdef __KERNEL__ 23 24 /* PAGE_SHIFT determines the page size */ 25 #define PAGE_SHIFT (12) 26 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 27 #define PAGE_MASK (~(PAGE_SIZE-1)) 28 29 #ifndef __ASSEMBLY__ 30 31 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) 32 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) 33 34 /* align addr on a size boundary - adjust address up/down if needed */ 35 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1))) 36 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1))) 37 38 /* align addr on a size boundary - adjust address up if needed */ 39 #define _ALIGN(addr, size) _ALIGN_UP(addr, size) 40 41 #ifndef CONFIG_MMU 42 /* 43 * PAGE_OFFSET -- the first address of the first page of memory. When not 44 * using MMU this corresponds to the first free page in physical memory (aligned 45 * on a page boundary). 46 */ 47 extern unsigned int __page_offset; 48 #define PAGE_OFFSET __page_offset 49 50 #else /* CONFIG_MMU */ 51 52 /* 53 * PAGE_OFFSET -- the first address of the first page of memory. With MMU 54 * it is set to the kernel start address (aligned on a page boundary). 55 * 56 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used 57 * in arch/microblaze/Makefile. 58 */ 59 #define PAGE_OFFSET CONFIG_KERNEL_START 60 61 /* 62 * MAP_NR -- given an address, calculate the index of the page struct which 63 * points to the address's page. 64 */ 65 #define MAP_NR(addr) (((unsigned long)(addr) - PAGE_OFFSET) >> PAGE_SHIFT) 66 67 /* 68 * The basic type of a PTE - 32 bit physical addressing. 69 */ 70 typedef unsigned long pte_basic_t; 71 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 72 #define PTE_FMT "%.8lx" 73 74 #endif /* CONFIG_MMU */ 75 76 # ifndef CONFIG_MMU 77 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 78 # define get_user_page(vaddr) __get_free_page(GFP_KERNEL) 79 # define free_user_page(page, addr) free_page(addr) 80 # else /* CONFIG_MMU */ 81 extern void copy_page(void *to, void *from); 82 # endif /* CONFIG_MMU */ 83 84 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 85 86 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 87 # define copy_user_page(vto, vfrom, vaddr, topg) \ 88 memcpy((vto), (vfrom), PAGE_SIZE) 89 90 /* 91 * These are used to make use of C type-checking.. 92 */ 93 typedef struct page *pgtable_t; 94 typedef struct { unsigned long pte; } pte_t; 95 typedef struct { unsigned long pgprot; } pgprot_t; 96 /* FIXME this can depend on linux kernel version */ 97 # ifdef CONFIG_MMU 98 typedef struct { unsigned long pmd; } pmd_t; 99 typedef struct { unsigned long pgd; } pgd_t; 100 # else /* CONFIG_MMU */ 101 typedef struct { unsigned long ste[64]; } pmd_t; 102 typedef struct { pmd_t pue[1]; } pud_t; 103 typedef struct { pud_t pge[1]; } pgd_t; 104 # endif /* CONFIG_MMU */ 105 106 # define pte_val(x) ((x).pte) 107 # define pgprot_val(x) ((x).pgprot) 108 109 # ifdef CONFIG_MMU 110 # define pmd_val(x) ((x).pmd) 111 # define pgd_val(x) ((x).pgd) 112 # else /* CONFIG_MMU */ 113 # define pmd_val(x) ((x).ste[0]) 114 # define pud_val(x) ((x).pue[0]) 115 # define pgd_val(x) ((x).pge[0]) 116 # endif /* CONFIG_MMU */ 117 118 # define __pte(x) ((pte_t) { (x) }) 119 # define __pmd(x) ((pmd_t) { (x) }) 120 # define __pgd(x) ((pgd_t) { (x) }) 121 # define __pgprot(x) ((pgprot_t) { (x) }) 122 123 /** 124 * Conversions for virtual address, physical address, pfn, and struct 125 * page are defined in the following files. 126 * 127 * virt -+ 128 * | asm-microblaze/page.h 129 * phys -+ 130 * | linux/pfn.h 131 * pfn -+ 132 * | asm-generic/memory_model.h 133 * page -+ 134 * 135 */ 136 137 extern unsigned long max_low_pfn; 138 extern unsigned long min_low_pfn; 139 extern unsigned long max_pfn; 140 141 extern unsigned long memory_start; 142 extern unsigned long memory_end; 143 extern unsigned long memory_size; 144 145 extern int page_is_ram(unsigned long pfn); 146 147 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 148 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 149 150 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 151 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 152 153 # ifdef CONFIG_MMU 154 # define virt_to_page(kaddr) (mem_map + MAP_NR(kaddr)) 155 # else /* CONFIG_MMU */ 156 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 157 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 158 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 159 # define page_to_bus(page) (page_to_phys(page)) 160 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 161 # endif /* CONFIG_MMU */ 162 163 # ifndef CONFIG_MMU 164 # define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) <= max_mapnr) 165 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 166 # else /* CONFIG_MMU */ 167 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 168 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 169 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 170 # endif /* CONFIG_MMU */ 171 172 # endif /* __ASSEMBLY__ */ 173 174 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 175 176 177 # ifndef CONFIG_MMU 178 # define __pa(vaddr) ((unsigned long) (vaddr)) 179 # define __va(paddr) ((void *) (paddr)) 180 # else /* CONFIG_MMU */ 181 # define __pa(x) __virt_to_phys((unsigned long)(x)) 182 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 183 # endif /* CONFIG_MMU */ 184 185 186 /* Convert between virtual and physical address for MMU. */ 187 /* Handle MicroBlaze processor with virtual memory. */ 188 #ifndef CONFIG_MMU 189 #define __virt_to_phys(addr) addr 190 #define __phys_to_virt(addr) addr 191 #define tophys(rd, rs) addik rd, rs, 0 192 #define tovirt(rd, rs) addik rd, rs, 0 193 #else 194 #define __virt_to_phys(addr) \ 195 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 196 #define __phys_to_virt(addr) \ 197 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 198 #define tophys(rd, rs) \ 199 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 200 #define tovirt(rd, rs) \ 201 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 202 #endif /* CONFIG_MMU */ 203 204 #define TOPHYS(addr) __virt_to_phys(addr) 205 206 #ifdef CONFIG_MMU 207 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC 208 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */ 209 #endif 210 211 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 212 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 213 #endif /* CONFIG_MMU */ 214 215 #endif /* __KERNEL__ */ 216 217 #include <asm-generic/memory_model.h> 218 #include <asm-generic/getorder.h> 219 220 #endif /* _ASM_MICROBLAZE_PAGE_H */ 221