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 pmd; } pmd_t; 94 typedef struct { unsigned long pgd; } pgd_t; 95 # else /* CONFIG_MMU */ 96 typedef struct { unsigned long ste[64]; } pmd_t; 97 typedef struct { pmd_t pue[1]; } pud_t; 98 typedef struct { pud_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 pmd_val(x) ((x).pmd) 106 # define pgd_val(x) ((x).pgd) 107 # else /* CONFIG_MMU */ 108 # define pmd_val(x) ((x).ste[0]) 109 # define pud_val(x) ((x).pue[0]) 110 # define pgd_val(x) ((x).pge[0]) 111 # endif /* CONFIG_MMU */ 112 113 # define __pte(x) ((pte_t) { (x) }) 114 # define __pmd(x) ((pmd_t) { (x) }) 115 # define __pgd(x) ((pgd_t) { (x) }) 116 # define __pgprot(x) ((pgprot_t) { (x) }) 117 118 /** 119 * Conversions for virtual address, physical address, pfn, and struct 120 * page are defined in the following files. 121 * 122 * virt -+ 123 * | asm-microblaze/page.h 124 * phys -+ 125 * | linux/pfn.h 126 * pfn -+ 127 * | asm-generic/memory_model.h 128 * page -+ 129 * 130 */ 131 132 extern unsigned long max_low_pfn; 133 extern unsigned long min_low_pfn; 134 extern unsigned long max_pfn; 135 136 extern unsigned long memory_start; 137 extern unsigned long memory_size; 138 extern unsigned long lowmem_size; 139 140 extern unsigned long kernel_tlb; 141 142 extern int page_is_ram(unsigned long pfn); 143 144 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 145 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 146 147 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 148 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 149 150 # ifdef CONFIG_MMU 151 152 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 153 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 154 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 155 156 # else /* CONFIG_MMU */ 157 # define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 158 # define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 159 # define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 160 # define page_to_bus(page) (page_to_phys(page)) 161 # define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 162 # endif /* CONFIG_MMU */ 163 164 # ifndef CONFIG_MMU 165 # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 166 ((pfn) <= (min_low_pfn + max_mapnr))) 167 # define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 168 # else /* CONFIG_MMU */ 169 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 170 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 171 # endif /* CONFIG_MMU */ 172 173 # endif /* __ASSEMBLY__ */ 174 175 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 176 177 # define __pa(x) __virt_to_phys((unsigned long)(x)) 178 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 179 180 /* Convert between virtual and physical address for MMU. */ 181 /* Handle MicroBlaze processor with virtual memory. */ 182 #ifndef CONFIG_MMU 183 #define __virt_to_phys(addr) addr 184 #define __phys_to_virt(addr) addr 185 #define tophys(rd, rs) addik rd, rs, 0 186 #define tovirt(rd, rs) addik rd, rs, 0 187 #else 188 #define __virt_to_phys(addr) \ 189 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 190 #define __phys_to_virt(addr) \ 191 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 192 #define tophys(rd, rs) \ 193 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 194 #define tovirt(rd, rs) \ 195 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 196 #endif /* CONFIG_MMU */ 197 198 #define TOPHYS(addr) __virt_to_phys(addr) 199 200 #ifdef CONFIG_MMU 201 202 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 203 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 204 #endif /* CONFIG_MMU */ 205 206 #endif /* __KERNEL__ */ 207 208 #include <asm-generic/memory_model.h> 209 #include <asm-generic/getorder.h> 210 211 #endif /* _ASM_MICROBLAZE_PAGE_H */ 212