1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _METAG_PAGE_H 3 #define _METAG_PAGE_H 4 5 #include <linux/const.h> 6 7 #include <asm/metag_mem.h> 8 9 /* PAGE_SHIFT determines the page size */ 10 #if defined(CONFIG_PAGE_SIZE_4K) 11 #define PAGE_SHIFT 12 12 #elif defined(CONFIG_PAGE_SIZE_8K) 13 #define PAGE_SHIFT 13 14 #elif defined(CONFIG_PAGE_SIZE_16K) 15 #define PAGE_SHIFT 14 16 #endif 17 18 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 19 #define PAGE_MASK (~(PAGE_SIZE-1)) 20 21 #if defined(CONFIG_HUGETLB_PAGE_SIZE_8K) 22 # define HPAGE_SHIFT 13 23 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_16K) 24 # define HPAGE_SHIFT 14 25 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_32K) 26 # define HPAGE_SHIFT 15 27 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_64K) 28 # define HPAGE_SHIFT 16 29 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_128K) 30 # define HPAGE_SHIFT 17 31 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K) 32 # define HPAGE_SHIFT 18 33 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_512K) 34 # define HPAGE_SHIFT 19 35 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_1M) 36 # define HPAGE_SHIFT 20 37 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_2M) 38 # define HPAGE_SHIFT 21 39 #elif defined(CONFIG_HUGETLB_PAGE_SIZE_4M) 40 # define HPAGE_SHIFT 22 41 #endif 42 43 #ifdef CONFIG_HUGETLB_PAGE 44 # define HPAGE_SIZE (1UL << HPAGE_SHIFT) 45 # define HPAGE_MASK (~(HPAGE_SIZE-1)) 46 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT) 47 /* 48 * We define our own hugetlb_get_unmapped_area so we don't corrupt 2nd level 49 * page tables with normal pages in them. 50 */ 51 # define HUGEPT_SHIFT (22) 52 # define HUGEPT_ALIGN (1 << HUGEPT_SHIFT) 53 # define HUGEPT_MASK (HUGEPT_ALIGN - 1) 54 # define ALIGN_HUGEPT(x) ALIGN(x, HUGEPT_ALIGN) 55 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 56 #endif 57 58 #ifndef __ASSEMBLY__ 59 60 /* On the Meta, we would like to know if the address (heap) we have is 61 * in local or global space. 62 */ 63 #define is_global_space(addr) ((addr) > 0x7fffffff) 64 #define is_local_space(addr) (!is_global_space(addr)) 65 66 extern void clear_page(void *to); 67 extern void copy_page(void *to, void *from); 68 69 #define clear_user_page(page, vaddr, pg) clear_page(page) 70 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 71 72 /* 73 * These are used to make use of C type-checking.. 74 */ 75 typedef struct { unsigned long pte; } pte_t; 76 typedef struct { unsigned long pgd; } pgd_t; 77 typedef struct { unsigned long pgprot; } pgprot_t; 78 typedef struct page *pgtable_t; 79 80 #define pte_val(x) ((x).pte) 81 #define pgd_val(x) ((x).pgd) 82 #define pgprot_val(x) ((x).pgprot) 83 84 #define __pte(x) ((pte_t) { (x) }) 85 #define __pgd(x) ((pgd_t) { (x) }) 86 #define __pgprot(x) ((pgprot_t) { (x) }) 87 88 /* The kernel must now ALWAYS live at either 0xC0000000 or 0x40000000 - that 89 * being either global or local space. 90 */ 91 #define PAGE_OFFSET (CONFIG_PAGE_OFFSET) 92 93 #if PAGE_OFFSET >= LINGLOBAL_BASE 94 #define META_MEMORY_BASE LINGLOBAL_BASE 95 #define META_MEMORY_LIMIT LINGLOBAL_LIMIT 96 #else 97 #define META_MEMORY_BASE LINLOCAL_BASE 98 #define META_MEMORY_LIMIT LINLOCAL_LIMIT 99 #endif 100 101 /* Offset between physical and virtual mapping of kernel memory. */ 102 extern unsigned int meta_memoffset; 103 104 #define __pa(x) ((unsigned long)(((unsigned long)(x)) - meta_memoffset)) 105 #define __va(x) ((void *)((unsigned long)(((unsigned long)(x)) + meta_memoffset))) 106 107 extern unsigned long pfn_base; 108 #define ARCH_PFN_OFFSET (pfn_base) 109 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 110 #define page_to_virt(page) __va(page_to_pfn(page) << PAGE_SHIFT) 111 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 112 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) 113 #ifdef CONFIG_FLATMEM 114 extern unsigned long max_pfn; 115 extern unsigned long min_low_pfn; 116 #define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_pfn) 117 #endif 118 119 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 120 121 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \ 122 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 123 124 #include <asm-generic/memory_model.h> 125 #include <asm-generic/getorder.h> 126 127 #endif /* __ASSMEBLY__ */ 128 129 #endif /* _METAG_PAGE_H */ 130