1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * VM ops 4 * 5 * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu> 6 * Copyright (C) 2008-2009 PetaLogix 7 * Copyright (C) 2006 Atmark Techno, Inc. 8 * Changes for MMU support: 9 * Copyright (C) 2007 Xilinx, Inc. All rights reserved. 10 */ 11 12 #ifndef _ASM_MICROBLAZE_PAGE_H 13 #define _ASM_MICROBLAZE_PAGE_H 14 15 #include <linux/pfn.h> 16 #include <asm/setup.h> 17 #include <asm/asm-compat.h> 18 #include <linux/const.h> 19 20 #ifdef __KERNEL__ 21 22 /* PAGE_SHIFT determines the page size */ 23 #define PAGE_SHIFT 12 24 #define PAGE_SIZE (ASM_CONST(1) << PAGE_SHIFT) 25 #define PAGE_MASK (~(PAGE_SIZE-1)) 26 27 #define LOAD_OFFSET ASM_CONST((CONFIG_KERNEL_START-CONFIG_KERNEL_BASE_ADDR)) 28 29 #define PTE_SHIFT (PAGE_SHIFT - 2) /* 1024 ptes per page */ 30 31 #ifndef __ASSEMBLY__ 32 33 /* 34 * PAGE_OFFSET -- the first address of the first page of memory. With MMU 35 * it is set to the kernel start address (aligned on a page boundary). 36 * 37 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used 38 * in arch/microblaze/Makefile. 39 */ 40 #define PAGE_OFFSET CONFIG_KERNEL_START 41 42 /* 43 * The basic type of a PTE - 32 bit physical addressing. 44 */ 45 typedef unsigned long pte_basic_t; 46 #define PTE_FMT "%.8lx" 47 48 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 49 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 50 51 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 52 # define copy_user_page(vto, vfrom, vaddr, topg) \ 53 memcpy((vto), (vfrom), PAGE_SIZE) 54 55 /* 56 * These are used to make use of C type-checking.. 57 */ 58 typedef struct page *pgtable_t; 59 typedef struct { unsigned long pte; } pte_t; 60 typedef struct { unsigned long pgprot; } pgprot_t; 61 /* FIXME this can depend on linux kernel version */ 62 typedef struct { unsigned long pgd; } pgd_t; 63 64 # define pte_val(x) ((x).pte) 65 # define pgprot_val(x) ((x).pgprot) 66 67 # define pgd_val(x) ((x).pgd) 68 69 # define __pte(x) ((pte_t) { (x) }) 70 # define __pgd(x) ((pgd_t) { (x) }) 71 # define __pgprot(x) ((pgprot_t) { (x) }) 72 73 /** 74 * Conversions for virtual address, physical address, pfn, and struct 75 * page are defined in the following files. 76 * 77 * virt -+ 78 * | asm-microblaze/page.h 79 * phys -+ 80 * | linux/pfn.h 81 * pfn -+ 82 * | asm-generic/memory_model.h 83 * page -+ 84 * 85 */ 86 87 extern unsigned long max_low_pfn; 88 extern unsigned long min_low_pfn; 89 extern unsigned long max_pfn; 90 91 extern unsigned long memory_start; 92 extern unsigned long memory_size; 93 extern unsigned long lowmem_size; 94 95 extern unsigned long kernel_tlb; 96 97 extern int page_is_ram(unsigned long pfn); 98 99 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 100 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 101 102 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 103 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 104 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 105 106 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 107 # endif /* __ASSEMBLY__ */ 108 109 /* Convert between virtual and physical address for MMU. */ 110 /* Handle MicroBlaze processor with virtual memory. */ 111 #define __virt_to_phys(addr) \ 112 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 113 #define __phys_to_virt(addr) \ 114 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 115 #define tophys(rd, rs) \ 116 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 117 #define tovirt(rd, rs) \ 118 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 119 120 #ifndef __ASSEMBLY__ 121 122 # define __pa(x) __virt_to_phys((unsigned long)(x)) 123 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 124 125 static inline unsigned long virt_to_pfn(const void *vaddr) 126 { 127 return phys_to_pfn(__pa(vaddr)); 128 } 129 130 static inline const void *pfn_to_virt(unsigned long pfn) 131 { 132 return __va(pfn_to_phys((pfn))); 133 } 134 135 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 136 137 #endif /* __ASSEMBLY__ */ 138 139 #define TOPHYS(addr) __virt_to_phys(addr) 140 141 #endif /* __KERNEL__ */ 142 143 #include <asm-generic/memory_model.h> 144 #include <asm-generic/getorder.h> 145 146 #endif /* _ASM_MICROBLAZE_PAGE_H */ 147