1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Page management definitions for the Hexagon architecture 4 * 5 * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. 6 */ 7 8 #ifndef _ASM_PAGE_H 9 #define _ASM_PAGE_H 10 11 #include <linux/const.h> 12 13 /* This is probably not the most graceful way to handle this. */ 14 15 #ifdef CONFIG_PAGE_SIZE_4KB 16 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB 17 #endif 18 19 #ifdef CONFIG_PAGE_SIZE_16KB 20 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB 21 #endif 22 23 #ifdef CONFIG_PAGE_SIZE_64KB 24 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB 25 #endif 26 27 #ifdef CONFIG_PAGE_SIZE_256KB 28 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB 29 #endif 30 31 #ifdef CONFIG_PAGE_SIZE_1MB 32 #define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB 33 #endif 34 35 /* 36 * These should be defined in hugetlb.h, but apparently not. 37 * "Huge" for us should be 4MB or 16MB, which are both represented 38 * in L1 PTE's. Right now, it's set up for 4MB. 39 */ 40 #ifdef CONFIG_HUGETLB_PAGE 41 #define HPAGE_SHIFT 22 42 #define HPAGE_SIZE (1UL << HPAGE_SHIFT) 43 #define HPAGE_MASK (~(HPAGE_SIZE-1)) 44 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 45 #define HVM_HUGEPAGE_SIZE 0x5 46 #endif 47 48 #define PAGE_SHIFT CONFIG_PAGE_SHIFT 49 #define PAGE_SIZE (1UL << PAGE_SHIFT) 50 #define PAGE_MASK (~((1 << PAGE_SHIFT) - 1)) 51 52 #ifdef __KERNEL__ 53 #ifndef __ASSEMBLY__ 54 55 /* 56 * This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in. 57 */ 58 #include <linux/pfn.h> 59 60 /* 61 * We implement a two-level architecture-specific page table structure. 62 * Null intermediate page table level (pmd, pud) definitions will come from 63 * asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h 64 */ 65 typedef struct { unsigned long pte; } pte_t; 66 typedef struct { unsigned long pgd; } pgd_t; 67 typedef struct { unsigned long pgprot; } pgprot_t; 68 typedef struct page *pgtable_t; 69 70 #define pte_val(x) ((x).pte) 71 #define pgd_val(x) ((x).pgd) 72 #define pgprot_val(x) ((x).pgprot) 73 #define __pte(x) ((pte_t) { (x) }) 74 #define __pgd(x) ((pgd_t) { (x) }) 75 #define __pgprot(x) ((pgprot_t) { (x) }) 76 77 /* Needed for PAGE_OFFSET used in the macro right below */ 78 #include <asm/mem-layout.h> 79 80 /* 81 * We need a __pa and a __va routine for kernel space. 82 * MIPS says they're only used during mem_init. 83 * also, check if we need a PHYS_OFFSET. 84 */ 85 #define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET) 86 #define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET)) 87 88 /* The "page frame" descriptor is defined in linux/mm.h */ 89 struct page; 90 91 /* Returns page frame descriptor for virtual address. */ 92 #define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr))) 93 94 /* Default vm area behavior is non-executable. */ 95 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 96 97 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 98 99 /* Need to not use a define for linesize; may move this to another file. */ 100 static inline void clear_page(void *page) 101 { 102 /* This can only be done on pages with L1 WB cache */ 103 asm volatile( 104 " loop0(1f,%1);\n" 105 "1: { dczeroa(%0);\n" 106 " %0 = add(%0,#32); }:endloop0\n" 107 : "+r" (page) 108 : "r" (PAGE_SIZE/32) 109 : "lc0", "sa0", "memory" 110 ); 111 } 112 113 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 114 115 /* 116 * Under assumption that kernel always "sees" user map... 117 */ 118 #define clear_user_page(page, vaddr, pg) clear_page(page) 119 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 120 121 /* 122 * page_to_phys - convert page to physical address 123 * @page - pointer to page entry in mem_map 124 */ 125 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 126 127 static inline unsigned long virt_to_pfn(const void *kaddr) 128 { 129 return __pa(kaddr) >> PAGE_SHIFT; 130 } 131 132 #define page_to_virt(page) __va(page_to_phys(page)) 133 134 #include <asm/mem-layout.h> 135 #include <asm-generic/memory_model.h> 136 /* XXX Todo: implement assembly-optimized version of getorder. */ 137 #include <asm-generic/getorder.h> 138 139 #endif /* ifdef __ASSEMBLY__ */ 140 #endif /* ifdef __KERNEL__ */ 141 142 #endif 143