Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 1 | #ifndef _ASM_POWERPC_PAGE_64_H |
| 2 | #define _ASM_POWERPC_PAGE_64_H |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 3 | #ifdef __KERNEL__ |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 4 | |
| 5 | /* |
| 6 | * Copyright (C) 2001 PPC64 Team, IBM Corp |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | /* |
| 15 | * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux |
| 16 | * specific, every notion of page number shared with the firmware, TCEs, |
| 17 | * iommu, etc... still uses a page size of 4K. |
| 18 | */ |
| 19 | #define HW_PAGE_SHIFT 12 |
| 20 | #define HW_PAGE_SIZE (ASM_CONST(1) << HW_PAGE_SHIFT) |
| 21 | #define HW_PAGE_MASK (~(HW_PAGE_SIZE-1)) |
| 22 | |
| 23 | /* |
| 24 | * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and |
| 25 | * HW_PAGE_SHIFT, that is 4K pages. |
| 26 | */ |
| 27 | #define PAGE_FACTOR (PAGE_SHIFT - HW_PAGE_SHIFT) |
| 28 | |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 29 | /* Segment size */ |
| 30 | #define SID_SHIFT 28 |
| 31 | #define SID_MASK 0xfffffffffUL |
| 32 | #define ESID_MASK 0xfffffffff0000000UL |
| 33 | #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK) |
| 34 | |
| 35 | #ifndef __ASSEMBLY__ |
| 36 | #include <asm/cache.h> |
| 37 | |
| 38 | typedef unsigned long pte_basic_t; |
| 39 | |
| 40 | static __inline__ void clear_page(void *addr) |
| 41 | { |
| 42 | unsigned long lines, line_size; |
| 43 | |
| 44 | line_size = ppc64_caches.dline_size; |
| 45 | lines = ppc64_caches.dlines_per_page; |
| 46 | |
| 47 | __asm__ __volatile__( |
| 48 | "mtctr %1 # clear_page\n\ |
| 49 | 1: dcbz 0,%0\n\ |
| 50 | add %0,%0,%3\n\ |
| 51 | bdnz+ 1b" |
| 52 | : "=r" (addr) |
| 53 | : "r" (lines), "0" (addr), "r" (line_size) |
| 54 | : "ctr", "memory"); |
| 55 | } |
| 56 | |
| 57 | extern void copy_4K_page(void *to, void *from); |
| 58 | |
| 59 | #ifdef CONFIG_PPC_64K_PAGES |
| 60 | static inline void copy_page(void *to, void *from) |
| 61 | { |
| 62 | unsigned int i; |
| 63 | for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) { |
| 64 | copy_4K_page(to, from); |
| 65 | to += 4096; |
| 66 | from += 4096; |
| 67 | } |
| 68 | } |
| 69 | #else /* CONFIG_PPC_64K_PAGES */ |
| 70 | static inline void copy_page(void *to, void *from) |
| 71 | { |
| 72 | copy_4K_page(to, from); |
| 73 | } |
| 74 | #endif /* CONFIG_PPC_64K_PAGES */ |
| 75 | |
| 76 | /* Log 2 of page table size */ |
| 77 | extern u64 ppc64_pft_size; |
| 78 | |
| 79 | /* Large pages size */ |
Andy Whitcroft | b50ce23 | 2005-11-18 01:11:02 -0800 | [diff] [blame] | 80 | #ifdef CONFIG_HUGETLB_PAGE |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 81 | extern unsigned int HPAGE_SHIFT; |
Andy Whitcroft | b50ce23 | 2005-11-18 01:11:02 -0800 | [diff] [blame] | 82 | #else |
| 83 | #define HPAGE_SHIFT PAGE_SHIFT |
| 84 | #endif |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 85 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) |
| 86 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) |
| 87 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) |
| 88 | |
| 89 | #endif /* __ASSEMBLY__ */ |
| 90 | |
| 91 | #ifdef CONFIG_HUGETLB_PAGE |
| 92 | |
| 93 | #define HTLB_AREA_SHIFT 40 |
| 94 | #define HTLB_AREA_SIZE (1UL << HTLB_AREA_SHIFT) |
| 95 | #define GET_HTLB_AREA(x) ((x) >> HTLB_AREA_SHIFT) |
| 96 | |
David Gibson | 9a94c57 | 2005-11-24 13:34:56 +1100 | [diff] [blame] | 97 | #define LOW_ESID_MASK(addr, len) \ |
| 98 | (((1U << (GET_ESID(min((addr)+(len)-1, 0x100000000UL))+1)) \ |
| 99 | - (1U << GET_ESID(min((addr), 0x100000000UL)))) & 0xffff) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 100 | #define HTLB_AREA_MASK(addr, len) (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \ |
| 101 | - (1U << GET_HTLB_AREA(addr))) & 0xffff) |
| 102 | |
| 103 | #define ARCH_HAS_HUGEPAGE_ONLY_RANGE |
David Gibson | f10a04c | 2006-04-28 15:02:51 +1000 | [diff] [blame] | 104 | #define ARCH_HAS_HUGETLB_FREE_PGD_RANGE |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 105 | #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE |
| 106 | #define ARCH_HAS_SETCLEAR_HUGE_PTE |
| 107 | |
| 108 | #define touches_hugepage_low_range(mm, addr, len) \ |
David Gibson | 9a94c57 | 2005-11-24 13:34:56 +1100 | [diff] [blame] | 109 | (((addr) < 0x100000000UL) \ |
| 110 | && (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas)) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 111 | #define touches_hugepage_high_range(mm, addr, len) \ |
David Gibson | 9a94c57 | 2005-11-24 13:34:56 +1100 | [diff] [blame] | 112 | ((((addr) + (len)) > 0x100000000UL) \ |
| 113 | && (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas)) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 114 | |
| 115 | #define __within_hugepage_low_range(addr, len, segmask) \ |
David Gibson | 9a94c57 | 2005-11-24 13:34:56 +1100 | [diff] [blame] | 116 | ( (((addr)+(len)) <= 0x100000000UL) \ |
| 117 | && ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask))) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 118 | #define within_hugepage_low_range(addr, len) \ |
| 119 | __within_hugepage_low_range((addr), (len), \ |
| 120 | current->mm->context.low_htlb_areas) |
| 121 | #define __within_hugepage_high_range(addr, len, zonemask) \ |
David Gibson | 9a94c57 | 2005-11-24 13:34:56 +1100 | [diff] [blame] | 122 | ( ((addr) >= 0x100000000UL) \ |
| 123 | && ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask))) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 124 | #define within_hugepage_high_range(addr, len) \ |
| 125 | __within_hugepage_high_range((addr), (len), \ |
| 126 | current->mm->context.high_htlb_areas) |
| 127 | |
| 128 | #define is_hugepage_only_range(mm, addr, len) \ |
| 129 | (touches_hugepage_high_range((mm), (addr), (len)) || \ |
| 130 | touches_hugepage_low_range((mm), (addr), (len))) |
| 131 | #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA |
| 132 | |
| 133 | #define in_hugepage_area(context, addr) \ |
| 134 | (cpu_has_feature(CPU_FTR_16M_PAGE) && \ |
David Gibson | 5e391dc | 2005-11-23 13:37:45 -0800 | [diff] [blame] | 135 | ( ( (addr) >= 0x100000000UL) \ |
| 136 | ? ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) \ |
| 137 | : ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) ) |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 138 | |
| 139 | #else /* !CONFIG_HUGETLB_PAGE */ |
| 140 | |
| 141 | #define in_hugepage_area(mm, addr) 0 |
| 142 | |
| 143 | #endif /* !CONFIG_HUGETLB_PAGE */ |
| 144 | |
| 145 | #ifdef MODULE |
| 146 | #define __page_aligned __attribute__((__aligned__(PAGE_SIZE))) |
| 147 | #else |
| 148 | #define __page_aligned \ |
| 149 | __attribute__((__aligned__(PAGE_SIZE), \ |
| 150 | __section__(".data.page_aligned"))) |
| 151 | #endif |
| 152 | |
| 153 | #define VM_DATA_DEFAULT_FLAGS \ |
| 154 | (test_thread_flag(TIF_32BIT) ? \ |
| 155 | VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64) |
| 156 | |
| 157 | /* |
| 158 | * This is the default if a program doesn't have a PT_GNU_STACK |
| 159 | * program header entry. The PPC64 ELF ABI has a non executable stack |
| 160 | * stack by default, so in the absense of a PT_GNU_STACK program header |
| 161 | * we turn execute permission off. |
| 162 | */ |
| 163 | #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ |
| 164 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
| 165 | |
| 166 | #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ |
| 167 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) |
| 168 | |
| 169 | #define VM_STACK_DEFAULT_FLAGS \ |
| 170 | (test_thread_flag(TIF_32BIT) ? \ |
| 171 | VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64) |
| 172 | |
| 173 | #include <asm-generic/page.h> |
| 174 | |
Arnd Bergmann | 88ced03 | 2005-12-16 22:43:46 +0100 | [diff] [blame] | 175 | #endif /* __KERNEL__ */ |
Michael Ellerman | 5cd16ee | 2005-11-11 14:25:24 +1100 | [diff] [blame] | 176 | #endif /* _ASM_POWERPC_PAGE_64_H */ |