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 /* MS be sure that SLAB allocates aligned objects */ 34 #define ARCH_DMA_MINALIGN L1_CACHE_BYTES 35 36 #define ARCH_SLAB_MINALIGN L1_CACHE_BYTES 37 38 /* 39 * PAGE_OFFSET -- the first address of the first page of memory. With MMU 40 * it is set to the kernel start address (aligned on a page boundary). 41 * 42 * CONFIG_KERNEL_START is defined in arch/microblaze/config.in and used 43 * in arch/microblaze/Makefile. 44 */ 45 #define PAGE_OFFSET CONFIG_KERNEL_START 46 47 /* 48 * The basic type of a PTE - 32 bit physical addressing. 49 */ 50 typedef unsigned long pte_basic_t; 51 #define PTE_FMT "%.8lx" 52 53 # define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 54 # define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 55 56 # define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 57 # define copy_user_page(vto, vfrom, vaddr, topg) \ 58 memcpy((vto), (vfrom), PAGE_SIZE) 59 60 /* 61 * These are used to make use of C type-checking.. 62 */ 63 typedef struct page *pgtable_t; 64 typedef struct { unsigned long pte; } pte_t; 65 typedef struct { unsigned long pgprot; } pgprot_t; 66 /* FIXME this can depend on linux kernel version */ 67 typedef struct { unsigned long pgd; } pgd_t; 68 69 # define pte_val(x) ((x).pte) 70 # define pgprot_val(x) ((x).pgprot) 71 72 # define pgd_val(x) ((x).pgd) 73 74 # define __pte(x) ((pte_t) { (x) }) 75 # define __pgd(x) ((pgd_t) { (x) }) 76 # define __pgprot(x) ((pgprot_t) { (x) }) 77 78 /** 79 * Conversions for virtual address, physical address, pfn, and struct 80 * page are defined in the following files. 81 * 82 * virt -+ 83 * | asm-microblaze/page.h 84 * phys -+ 85 * | linux/pfn.h 86 * pfn -+ 87 * | asm-generic/memory_model.h 88 * page -+ 89 * 90 */ 91 92 extern unsigned long max_low_pfn; 93 extern unsigned long min_low_pfn; 94 extern unsigned long max_pfn; 95 96 extern unsigned long memory_start; 97 extern unsigned long memory_size; 98 extern unsigned long lowmem_size; 99 100 extern unsigned long kernel_tlb; 101 102 extern int page_is_ram(unsigned long pfn); 103 104 # define phys_to_pfn(phys) (PFN_DOWN(phys)) 105 # define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 106 107 # define virt_to_pfn(vaddr) (phys_to_pfn((__pa(vaddr)))) 108 # define pfn_to_virt(pfn) __va(pfn_to_phys((pfn))) 109 110 # define virt_to_page(kaddr) (pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)) 111 # define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 112 # define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 113 114 # define ARCH_PFN_OFFSET (memory_start >> PAGE_SHIFT) 115 # define pfn_valid(pfn) ((pfn) < (max_mapnr + ARCH_PFN_OFFSET)) 116 117 # endif /* __ASSEMBLY__ */ 118 119 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 120 121 # define __pa(x) __virt_to_phys((unsigned long)(x)) 122 # define __va(x) ((void *)__phys_to_virt((unsigned long)(x))) 123 124 /* Convert between virtual and physical address for MMU. */ 125 /* Handle MicroBlaze processor with virtual memory. */ 126 #define __virt_to_phys(addr) \ 127 ((addr) + CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 128 #define __phys_to_virt(addr) \ 129 ((addr) + CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 130 #define tophys(rd, rs) \ 131 addik rd, rs, (CONFIG_KERNEL_BASE_ADDR - CONFIG_KERNEL_START) 132 #define tovirt(rd, rs) \ 133 addik rd, rs, (CONFIG_KERNEL_START - CONFIG_KERNEL_BASE_ADDR) 134 135 #define TOPHYS(addr) __virt_to_phys(addr) 136 137 #endif /* __KERNEL__ */ 138 139 #include <asm-generic/memory_model.h> 140 #include <asm-generic/getorder.h> 141 142 #endif /* _ASM_MICROBLAZE_PAGE_H */ 143