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_32K_PAGES) 27 #define PAGE_SHIFT 15 28 #elif defined(CONFIG_MICROBLAZE_16K_PAGES) 29 #define PAGE_SHIFT 14 30 #elif defined(CONFIG_MICROBLAZE_8K_PAGES) 31 #define PAGE_SHIFT 13 32 #else 33 #define PAGE_SHIFT 12 34 #endif 35 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) 36 #define PAGE_MASK (~(PAGE_SIZE-1)) 37 38 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR)) 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_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 75 #define PTE_FMT "%.8lx" 76 77 #endif /* CONFIG_MMU */ 78 79 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 80 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 81 82 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 83 # define copy_user_page(vto, vfrom, vaddr, topg) \ 84 memcpy((vto), (vfrom), PAGE_SIZE) 85 86 /* 87 * These are used to make use of C type-checking.. 88 */ 89 typedef struct page *pgtable_t; 90 typedef struct { unsigned long pte; } pte_t; 91 typedef struct { unsigned long pgprot; } pgprot_t; 92 /* FIXME this can depend on linux kernel version */ 93 # ifdef CONFIG_MMU 94 typedef struct { unsigned long pmd; } pmd_t; 95 typedef struct { unsigned long pgd; } pgd_t; 96 # else /* CONFIG_MMU */ 97 typedef struct { unsigned long ste[64]; } pmd_t; 98 typedef struct { pmd_t pue[1]; } pud_t; 99 typedef struct { pud_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_end; 139 extern unsigned long memory_size; 140 141 extern int page_is_ram(unsigned long pfn); 142 143 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 144 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 145 146 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 147 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 148 149 # ifdef CONFIG_MMU 150 151 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 152 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 153 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 154 155 # 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) && \ 165 ((pfn) <= (min_low_pfn + max_mapnr))) 166 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 167 # else /* CONFIG_MMU */ 168 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 169 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 170 # define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 171 # endif /* CONFIG_MMU */ 172 173 # endif /* __ASSEMBLY__ */ 174 175 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 176 177 178 # ifndef CONFIG_MMU 179 # define __pa(vaddr) ((unsigned long) (vaddr)) 180 # define __va(paddr) ((void *) (paddr)) 181 # else /* CONFIG_MMU */ 182 # define __pa(x) __virt_to_phys((unsigned long)(x)) 183 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 184 # endif /* CONFIG_MMU */ 185 186 187 /* Convert between virtual and physical address for MMU. */ 188 /* Handle MicroBlaze processor with virtual memory. */ 189 #ifndef CONFIG_MMU 190 #define __virt_to_phys(addr) addr 191 #define __phys_to_virt(addr) addr 192 #define tophys(rd, rs) addik rd, rs, 0 193 #define tovirt(rd, rs) addik rd, rs, 0 194 #else 195 #define __virt_to_phys(addr) \ 196 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 197 #define __phys_to_virt(addr) \ 198 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 199 #define tophys(rd, rs) \ 200 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 201 #define tovirt(rd, rs) \ 202 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 203 #endif /* CONFIG_MMU */ 204 205 #define TOPHYS(addr) __virt_to_phys(addr) 206 207 #ifdef CONFIG_MMU 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