1 #ifndef _ASM_POWERPC_PAGE_64_H 2 #define _ASM_POWERPC_PAGE_64_H 3 4 /* 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 /* 14 * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux 15 * specific, every notion of page number shared with the firmware, TCEs, 16 * iommu, etc... still uses a page size of 4K. 17 */ 18 #define HW_PAGE_SHIFT 12 19 #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT) 20 #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1)) 21 22 /* 23 * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and 24 * HW_PAGE_SHIFT, that is 4K pages. 25 */ 26 #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT) 27 28 /* Segment size; normal 256M segments */ 29 #define SID_SHIFT 28 30 #define SID_MASK ASM_CONST(0xfffffffff) 31 #define ESID_MASK 0xfffffffff0000000UL 32 #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK) 33 34 /* 1T segments */ 35 #define SID_SHIFT_1T 40 36 #define SID_MASK_1T 0xffffffUL 37 #define ESID_MASK_1T 0xffffff0000000000UL 38 #define GET_ESID_1T(x) (((x) >> SID_SHIFT_1T) & SID_MASK_1T) 39 40 #ifndef __ASSEMBLY__ 41 #include <asm/cache.h> 42 43 typedef unsigned long pte_basic_t; 44 45 static __inline__ void clear_page(void *addr) 46 { 47 unsigned long lines, line_size; 48 49 line_size = ppc64_caches.dline_size; 50 lines = ppc64_caches.dlines_per_page; 51 52 __asm__ __volatile__( 53 "mtctr %1 # clear_page\n\ 54 1: dcbz 0,%0\n\ 55 add %0,%0,%3\n\ 56 bdnz+ 1b" 57 : "=r" (addr) 58 : "r" (lines), "0" (addr), "r" (line_size) 59 : "ctr", "memory"); 60 } 61 62 extern void copy_4K_page(void *to, void *from); 63 64 #ifdef CONFIG_PPC_64K_PAGES 65 static inline void copy_page(void *to, void *from) 66 { 67 unsigned int i; 68 for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) { 69 copy_4K_page(to, from); 70 to += 4096; 71 from += 4096; 72 } 73 } 74 #else /* CONFIG_PPC_64K_PAGES */ 75 static inline void copy_page(void *to, void *from) 76 { 77 copy_4K_page(to, from); 78 } 79 #endif /* CONFIG_PPC_64K_PAGES */ 80 81 /* Log 2 of page table size */ 82 extern u64 ppc64_pft_size; 83 84 /* Large pages size */ 85 #ifdef CONFIG_HUGETLB_PAGE 86 extern unsigned int HPAGE_SHIFT; 87 #else 88 #define HPAGE_SHIFT PAGE_SHIFT 89 #endif 90 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) 91 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 92 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 93 #define HUGE_MAX_HSTATE (MMU_PAGE_COUNT-1) 94 95 #endif /* __ASSEMBLY__ */ 96 97 #ifdef CONFIG_PPC_MM_SLICES 98 99 #define SLICE_LOW_SHIFT 28 100 #define SLICE_HIGH_SHIFT 40 101 102 #define SLICE_LOW_TOP (0x100000000ul) 103 #define SLICE_NUM_LOW (SLICE_LOW_TOP >> SLICE_LOW_SHIFT) 104 #define SLICE_NUM_HIGH (PGTABLE_RANGE >> SLICE_HIGH_SHIFT) 105 106 #define GET_LOW_SLICE_INDEX(addr) ((addr) >> SLICE_LOW_SHIFT) 107 #define GET_HIGH_SLICE_INDEX(addr) ((addr) >> SLICE_HIGH_SHIFT) 108 109 #ifndef __ASSEMBLY__ 110 111 struct slice_mask { 112 u16 low_slices; 113 u16 high_slices; 114 }; 115 116 struct mm_struct; 117 118 extern unsigned long slice_get_unmapped_area(unsigned long addr, 119 unsigned long len, 120 unsigned long flags, 121 unsigned int psize, 122 int topdown, 123 int use_cache); 124 125 extern unsigned int get_slice_psize(struct mm_struct *mm, 126 unsigned long addr); 127 128 extern void slice_init_context(struct mm_struct *mm, unsigned int psize); 129 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize); 130 extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start, 131 unsigned long len, unsigned int psize); 132 133 #define slice_mm_new_context(mm) ((mm)->context.id == 0) 134 135 #endif /* __ASSEMBLY__ */ 136 #else 137 #define slice_init() 138 #ifdef CONFIG_PPC_STD_MMU_64 139 #define get_slice_psize(mm, addr) ((mm)->context.user_psize) 140 #define slice_set_user_psize(mm, psize) \ 141 do { \ 142 (mm)->context.user_psize = (psize); \ 143 (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \ 144 } while (0) 145 #else /* CONFIG_PPC_STD_MMU_64 */ 146 #ifdef CONFIG_PPC_64K_PAGES 147 #define get_slice_psize(mm, addr) MMU_PAGE_64K 148 #else /* CONFIG_PPC_64K_PAGES */ 149 #define get_slice_psize(mm, addr) MMU_PAGE_4K 150 #endif /* !CONFIG_PPC_64K_PAGES */ 151 #define slice_set_user_psize(mm, psize) do { BUG(); } while(0) 152 #endif /* !CONFIG_PPC_STD_MMU_64 */ 153 154 #define slice_set_range_psize(mm, start, len, psize) \ 155 slice_set_user_psize((mm), (psize)) 156 #define slice_mm_new_context(mm) 1 157 #endif /* CONFIG_PPC_MM_SLICES */ 158 159 #ifdef CONFIG_HUGETLB_PAGE 160 161 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA 162 163 #endif /* !CONFIG_HUGETLB_PAGE */ 164 165 #define VM_DATA_DEFAULT_FLAGS \ 166 (is_32bit_task() ? \ 167 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64) 168 169 /* 170 * This is the default if a program doesn't have a PT_GNU_STACK 171 * program header entry. The PPC64 ELF ABI has a non executable stack 172 * stack by default, so in the absense of a PT_GNU_STACK program header 173 * we turn execute permission off. 174 */ 175 #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ 176 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 177 178 #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ 179 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 180 181 #define VM_STACK_DEFAULT_FLAGS \ 182 (is_32bit_task() ? \ 183 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64) 184 185 #include <asm-generic/getorder.h> 186 187 #endif /* _ASM_POWERPC_PAGE_64_H */ 188