1 /* 2 * This file contains the functions and defines necessary to modify and 3 * use the SuperH page table tree. 4 * 5 * Copyright (C) 1999 Niibe Yutaka 6 * Copyright (C) 2002 - 2007 Paul Mundt 7 * 8 * This file is subject to the terms and conditions of the GNU General 9 * Public License. See the file "COPYING" in the main directory of this 10 * archive for more details. 11 */ 12 #ifndef __ASM_SH_PGTABLE_H 13 #define __ASM_SH_PGTABLE_H 14 15 #include <asm-generic/pgtable-nopmd.h> 16 #include <asm/page.h> 17 18 #ifndef __ASSEMBLY__ 19 #include <asm/addrspace.h> 20 #include <asm/fixmap.h> 21 22 /* 23 * ZERO_PAGE is a global shared page that is always zero: used 24 * for zero-mapped memory areas etc.. 25 */ 26 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]; 27 #define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page)) 28 29 #endif /* !__ASSEMBLY__ */ 30 31 /* 32 * Effective and physical address definitions, to aid with sign 33 * extension. 34 */ 35 #define NEFF 32 36 #define NEFF_SIGN (1LL << (NEFF - 1)) 37 #define NEFF_MASK (-1LL << NEFF) 38 39 #ifdef CONFIG_29BIT 40 #define NPHYS 29 41 #else 42 #define NPHYS 32 43 #endif 44 45 #define NPHYS_SIGN (1LL << (NPHYS - 1)) 46 #define NPHYS_MASK (-1LL << NPHYS) 47 48 /* 49 * traditional two-level paging structure 50 */ 51 /* PTE bits */ 52 #if defined(CONFIG_X2TLB) || defined(CONFIG_SUPERH64) 53 # define PTE_MAGNITUDE 3 /* 64-bit PTEs on extended mode SH-X2 TLB */ 54 #else 55 # define PTE_MAGNITUDE 2 /* 32-bit PTEs */ 56 #endif 57 #define PTE_SHIFT PAGE_SHIFT 58 #define PTE_BITS (PTE_SHIFT - PTE_MAGNITUDE) 59 60 /* PGD bits */ 61 #define PGDIR_SHIFT (PTE_SHIFT + PTE_BITS) 62 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 63 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 64 65 /* Entries per level */ 66 #define PTRS_PER_PTE (PAGE_SIZE / (1 << PTE_MAGNITUDE)) 67 #define PTRS_PER_PGD (PAGE_SIZE / sizeof(pgd_t)) 68 69 #define USER_PTRS_PER_PGD (TASK_SIZE/PGDIR_SIZE) 70 #define FIRST_USER_ADDRESS 0 71 72 #ifdef CONFIG_32BIT 73 #define PHYS_ADDR_MASK 0xffffffff 74 #else 75 #define PHYS_ADDR_MASK 0x1fffffff 76 #endif 77 78 #define PTE_PHYS_MASK (PHYS_ADDR_MASK & PAGE_MASK) 79 80 #ifdef CONFIG_SUPERH32 81 #define VMALLOC_START (P3SEG) 82 #else 83 #define VMALLOC_START (0xf0000000) 84 #endif 85 #define VMALLOC_END (FIXADDR_START-2*PAGE_SIZE) 86 87 #if defined(CONFIG_SUPERH32) 88 #include <asm/pgtable_32.h> 89 #else 90 #include <asm/pgtable_64.h> 91 #endif 92 93 /* 94 * SH-X and lower (legacy) SuperH parts (SH-3, SH-4, some SH-4A) can't do page 95 * protection for execute, and considers it the same as a read. Also, write 96 * permission implies read permission. This is the closest we can get.. 97 * 98 * SH-X2 (SH7785) and later parts take this to the opposite end of the extreme, 99 * not only supporting separate execute, read, and write bits, but having 100 * completely separate permission bits for user and kernel space. 101 */ 102 /*xwr*/ 103 #define __P000 PAGE_NONE 104 #define __P001 PAGE_READONLY 105 #define __P010 PAGE_COPY 106 #define __P011 PAGE_COPY 107 #define __P100 PAGE_EXECREAD 108 #define __P101 PAGE_EXECREAD 109 #define __P110 PAGE_COPY 110 #define __P111 PAGE_COPY 111 112 #define __S000 PAGE_NONE 113 #define __S001 PAGE_READONLY 114 #define __S010 PAGE_WRITEONLY 115 #define __S011 PAGE_SHARED 116 #define __S100 PAGE_EXECREAD 117 #define __S101 PAGE_EXECREAD 118 #define __S110 PAGE_RWX 119 #define __S111 PAGE_RWX 120 121 typedef pte_t *pte_addr_t; 122 123 #define kern_addr_valid(addr) (1) 124 125 #define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \ 126 remap_pfn_range(vma, vaddr, pfn, size, prot) 127 128 #define pte_pfn(x) ((unsigned long)(((x).pte_low >> PAGE_SHIFT))) 129 130 /* 131 * No page table caches to initialise 132 */ 133 #define pgtable_cache_init() do { } while (0) 134 135 #if !defined(CONFIG_CACHE_OFF) && (defined(CONFIG_CPU_SH4) || \ 136 defined(CONFIG_SH7705_CACHE_32KB)) 137 struct mm_struct; 138 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR 139 pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep); 140 #endif 141 142 struct vm_area_struct; 143 extern void update_mmu_cache(struct vm_area_struct * vma, 144 unsigned long address, pte_t pte); 145 extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; 146 extern void paging_init(void); 147 extern void page_table_range_init(unsigned long start, unsigned long end, 148 pgd_t *pgd); 149 150 #include <asm-generic/pgtable.h> 151 152 #endif /* __ASM_SH_PGTABLE_H */ 153