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_64K_PAGES) 27 #define PAGE_SHIFT 16 28 #elif defined(CONFIG_MICROBLAZE_16K_PAGES) 29 #define PAGE_SHIFT 14 30 #else 31 #define PAGE_SHIFT 12 32 #endif 33 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) 34 #define PAGE_MASK (~(PAGE_SIZE-1)) 35 36 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR)) 37 38 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 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_FMT "%.8lx" 75 76 #endif /* CONFIG_MMU */ 77 78 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 79 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 80 81 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 82 # define copy_user_page(vto, vfrom, vaddr, topg) \ 83 memcpy((vto), (vfrom), PAGE_SIZE) 84 85 /* 86 * These are used to make use of C type-checking.. 87 */ 88 typedef struct page *pgtable_t; 89 typedef struct { unsigned long pte; } pte_t; 90 typedef struct { unsigned long pgprot; } pgprot_t; 91 /* FIXME this can depend on linux kernel version */ 92 # ifdef CONFIG_MMU 93 typedef struct { unsigned long pgd; } pgd_t; 94 # else /* CONFIG_MMU */ 95 typedef struct { unsigned long ste[64]; } pmd_t; 96 typedef struct { pmd_t pue[1]; } pud_t; 97 typedef struct { pud_t p4e[1]; } p4d_t; 98 typedef struct { p4d_t pge[1]; } pgd_t; 99 # endif /* CONFIG_MMU */ 100 101 # define pte_val(x) ((x).pte) 102 # define pgprot_val(x) ((x).pgprot) 103 104 # ifdef CONFIG_MMU 105 # define pgd_val(x) ((x).pgd) 106 # else /* CONFIG_MMU */ 107 # define pmd_val(x) ((x).ste[0]) 108 # define pud_val(x) ((x).pue[0]) 109 # define pgd_val(x) ((x).pge[0]) 110 # endif /* CONFIG_MMU */ 111 112 # define __pte(x) ((pte_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_size; 136 extern unsigned long lowmem_size; 137 138 extern unsigned long kernel_tlb; 139 140 extern int page_is_ram(unsigned long pfn); 141 142 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 143 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 144 145 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 146 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 147 148 # ifdef CONFIG_MMU 149 150 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 151 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 152 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 153 154 # else /* CONFIG_MMU */ 155 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 156 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 157 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 158 # define page_to_bus(page) (page_to_phys(page)) 159 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 160 # endif /* CONFIG_MMU */ 161 162 # ifndef CONFIG_MMU 163 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 164 ((pfn) <= (min_low_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 # endif /* CONFIG_MMU */ 170 171 # endif /* __ASSEMBLY__ */ 172 173 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 174 175 # define __pa(x) __virt_to_phys((unsigned long)(x)) 176 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 177 178 /* Convert between virtual and physical address for MMU. */ 179 /* Handle MicroBlaze processor with virtual memory. */ 180 #ifndef CONFIG_MMU 181 #define __virt_to_phys(addr) addr 182 #define __phys_to_virt(addr) addr 183 #define tophys(rd, rs) addik rd, rs, 0 184 #define tovirt(rd, rs) addik rd, rs, 0 185 #else 186 #define __virt_to_phys(addr) \ 187 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 188 #define __phys_to_virt(addr) \ 189 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 190 #define tophys(rd, rs) \ 191 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 192 #define tovirt(rd, rs) \ 193 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 194 #endif /* CONFIG_MMU */ 195 196 #define TOPHYS(addr) __virt_to_phys(addr) 197 198 #ifdef CONFIG_MMU 199 200 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 201 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 202 #endif /* CONFIG_MMU */ 203 204 #endif /* __KERNEL__ */ 205 206 #include <asm-generic/memory_model.h> 207 #include <asm-generic/getorder.h> 208 209 #endif /* _ASM_MICROBLAZE_PAGE_H */ 210