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