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 /* MS be sure that SLAB allocates aligned objects */ 35 #define ARCH_KMALLOC_MINALIGN L1_CACHE_BYTES 36 37 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) 38 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) 39 40 /* align addr on a size boundary - adjust address up/down if needed */ 41 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1))) 42 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1))) 43 44 /* align addr on a size boundary - adjust address up if needed */ 45 #define _ALIGN(addr, size) _ALIGN_UP(addr, size) 46 47 #ifndef CONFIG_MMU 48 /* 49 * PAGE_OFFSET -- the first address of the first page of memory. When not 50 * using MMU this corresponds to the first free page in physical memory (aligned 51 * on a page boundary). 52 */ 53 extern unsigned int __page_offset; 54 #define PAGE_OFFSET __page_offset 55 56 #else /* CONFIG_MMU */ 57 58 /* 59 * PAGE_OFFSET -- the first address of the first page of memory. With MMU 60 * it is set to the kernel start address (aligned on a page boundary). 61 * 62 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used 63 * in arch/microblaze/Makefile. 64 */ 65 #define PAGE_OFFSET CONFIG_KERNEL_START 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 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 77 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 78 79 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 80 # define copy_user_page(vto, vfrom, vaddr, topg) \ 81 memcpy((vto), (vfrom), PAGE_SIZE) 82 83 /* 84 * These are used to make use of C type-checking.. 85 */ 86 typedef struct page *pgtable_t; 87 typedef struct { unsigned long pte; } pte_t; 88 typedef struct { unsigned long pgprot; } pgprot_t; 89 /* FIXME this can depend on linux kernel version */ 90 # ifdef CONFIG_MMU 91 typedef struct { unsigned long pmd; } pmd_t; 92 typedef struct { unsigned long pgd; } pgd_t; 93 # else /* CONFIG_MMU */ 94 typedef struct { unsigned long ste[64]; } pmd_t; 95 typedef struct { pmd_t pue[1]; } pud_t; 96 typedef struct { pud_t pge[1]; } pgd_t; 97 # endif /* CONFIG_MMU */ 98 99 # define pte_val(x) ((x).pte) 100 # define pgprot_val(x) ((x).pgprot) 101 102 # ifdef CONFIG_MMU 103 # define pmd_val(x) ((x).pmd) 104 # define pgd_val(x) ((x).pgd) 105 # else /* CONFIG_MMU */ 106 # define pmd_val(x) ((x).ste[0]) 107 # define pud_val(x) ((x).pue[0]) 108 # define pgd_val(x) ((x).pge[0]) 109 # endif /* CONFIG_MMU */ 110 111 # define __pte(x) ((pte_t) { (x) }) 112 # define __pmd(x) ((pmd_t) { (x) }) 113 # define __pgd(x) ((pgd_t) { (x) }) 114 # define __pgprot(x) ((pgprot_t) { (x) }) 115 116 /** 117 * Conversions for virtual address, physical address, pfn, and struct 118 * page are defined in the following files. 119 * 120 * virt -+ 121 * | asm-microblaze/page.h 122 * phys -+ 123 * | linux/pfn.h 124 * pfn -+ 125 * | asm-generic/memory_model.h 126 * page -+ 127 * 128 */ 129 130 extern unsigned long max_low_pfn; 131 extern unsigned long min_low_pfn; 132 extern unsigned long max_pfn; 133 134 extern unsigned long memory_start; 135 extern unsigned long memory_end; 136 extern unsigned long memory_size; 137 138 extern int page_is_ram(unsigned long pfn); 139 140 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 141 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 142 143 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 144 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 145 146 # ifdef CONFIG_MMU 147 148 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 149 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 150 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 151 152 # else /* CONFIG_MMU */ 153 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 154 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 155 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 156 # define page_to_bus(page) (page_to_phys(page)) 157 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 158 # endif /* CONFIG_MMU */ 159 160 # ifndef CONFIG_MMU 161 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 162 ((pfn) <= (min_low_pfn + max_mapnr))) 163 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 164 # else /* CONFIG_MMU */ 165 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 166 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 167 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 168 # endif /* CONFIG_MMU */ 169 170 # endif /* __ASSEMBLY__ */ 171 172 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 173 174 175 # ifndef CONFIG_MMU 176 # define __pa(vaddr) ((unsigned long) (vaddr)) 177 # define __va(paddr) ((void *) (paddr)) 178 # else /* CONFIG_MMU */ 179 # define __pa(x) __virt_to_phys((unsigned long)(x)) 180 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 181 # endif /* CONFIG_MMU */ 182 183 184 /* Convert between virtual and physical address for MMU. */ 185 /* Handle MicroBlaze processor with virtual memory. */ 186 #ifndef CONFIG_MMU 187 #define __virt_to_phys(addr) addr 188 #define __phys_to_virt(addr) addr 189 #define tophys(rd, rs) addik rd, rs, 0 190 #define tovirt(rd, rs) addik rd, rs, 0 191 #else 192 #define __virt_to_phys(addr) \ 193 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 194 #define __phys_to_virt(addr) \ 195 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 196 #define tophys(rd, rs) \ 197 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 198 #define tovirt(rd, rs) \ 199 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 200 #endif /* CONFIG_MMU */ 201 202 #define TOPHYS(addr) __virt_to_phys(addr) 203 204 #ifdef CONFIG_MMU 205 #ifdef CONFIG_CONTIGUOUS_PAGE_ALLOC 206 #define WANT_PAGE_VIRTUAL 1 /* page alloc 2 relies on this */ 207 #endif 208 209 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 210 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 211 #endif /* CONFIG_MMU */ 212 213 #endif /* __KERNEL__ */ 214 215 #include <asm-generic/memory_model.h> 216 #include <asm-generic/getorder.h> 217 218 #endif /* _ASM_MICROBLAZE_PAGE_H */ 219