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 */ 56extern 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 */ 73typedef 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 */ 89typedef struct page *pgtable_t; 90typedef struct { unsigned long pte; } pte_t; 91typedef struct { unsigned long pgprot; } pgprot_t; 92/* FIXME this can depend on linux kernel version */ 93# ifdef CONFIG_MMU 94typedef struct { unsigned long pmd; } pmd_t; 95typedef struct { unsigned long pgd; } pgd_t; 96# else /* CONFIG_MMU */ 97typedef struct { unsigned long ste[64]; } pmd_t; 98typedef struct { pmd_t pue[1]; } pud_t; 99typedef 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 133extern unsigned long max_low_pfn; 134extern unsigned long min_low_pfn; 135extern unsigned long max_pfn; 136 137extern unsigned long memory_start; 138extern unsigned long memory_size; 139extern unsigned long lowmem_size; 140 141extern unsigned long kernel_tlb; 142 143extern int page_is_ram(unsigned long pfn); 144 145# define phys_to_pfn(phys) (PFN_DOWN(phys)) 146# define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 147 148# define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 149# define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 150 151# ifdef CONFIG_MMU 152 153# define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 154# define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 155# define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 156 157# else /* CONFIG_MMU */ 158# define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 159# define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 160# define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 161# define page_to_bus(page) (page_to_phys(page)) 162# define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 163# endif /* CONFIG_MMU */ 164 165# ifndef CONFIG_MMU 166# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && \ 167 ((pfn) <= (min_low_pfn + max_mapnr))) 168# define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 169# else /* CONFIG_MMU */ 170# define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 171# define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 172# define VALID_PAGE(page) ((page - mem_map) < max_mapnr) 173# endif /* CONFIG_MMU */ 174 175# endif /* __ASSEMBLY__ */ 176 177#define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 178 179# define __pa(x) __virt_to_phys((unsigned long)(x)) 180# define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 181 182/* Convert between virtual and physical address for MMU. */ 183/* Handle MicroBlaze processor with virtual memory. */ 184#ifndef CONFIG_MMU 185#define __virt_to_phys(addr) addr 186#define __phys_to_virt(addr) addr 187#define tophys(rd, rs) addik rd, rs, 0 188#define tovirt(rd, rs) addik rd, rs, 0 189#else 190#define __virt_to_phys(addr) \ 191 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 192#define __phys_to_virt(addr) \ 193 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 194#define tophys(rd, rs) \ 195 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 196#define tovirt(rd, rs) \ 197 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 198#endif /* CONFIG_MMU */ 199 200#define TOPHYS(addr) __virt_to_phys(addr) 201 202#ifdef CONFIG_MMU 203 204#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 205 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 206#endif /* CONFIG_MMU */ 207 208#endif /* __KERNEL__ */ 209 210#include <asm-generic/memory_model.h> 211#include <asm-generic/getorder.h> 212 213#endif /* _ASM_MICROBLAZE_PAGE_H */ 214