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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 | #define REGION_SIZE 4UL | |
29 | #define REGION_SHIFT 60UL | |
30 | #define REGION_MASK (((1UL<<REGION_SIZE)-1UL)<<REGION_SHIFT) | |
31 | ||
32 | #define VMALLOCBASE ASM_CONST(0xD000000000000000) | |
33 | #define VMALLOC_REGION_ID (VMALLOCBASE >> REGION_SHIFT) | |
34 | #define KERNEL_REGION_ID (KERNELBASE >> REGION_SHIFT) | |
35 | #define USER_REGION_ID (0UL) | |
36 | #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT) | |
37 | ||
38 | /* Segment size */ | |
39 | #define SID_SHIFT 28 | |
40 | #define SID_MASK 0xfffffffffUL | |
41 | #define ESID_MASK 0xfffffffff0000000UL | |
42 | #define GET_ESID(x) (((x) >> SID_SHIFT) & SID_MASK) | |
43 | ||
44 | #ifndef __ASSEMBLY__ | |
45 | #include <asm/cache.h> | |
46 | ||
47 | typedef unsigned long pte_basic_t; | |
48 | ||
49 | static __inline__ void clear_page(void *addr) | |
50 | { | |
51 | unsigned long lines, line_size; | |
52 | ||
53 | line_size = ppc64_caches.dline_size; | |
54 | lines = ppc64_caches.dlines_per_page; | |
55 | ||
56 | __asm__ __volatile__( | |
57 | "mtctr %1 # clear_page\n\ | |
58 | 1: dcbz 0,%0\n\ | |
59 | add %0,%0,%3\n\ | |
60 | bdnz+ 1b" | |
61 | : "=r" (addr) | |
62 | : "r" (lines), "0" (addr), "r" (line_size) | |
63 | : "ctr", "memory"); | |
64 | } | |
65 | ||
66 | extern void copy_4K_page(void *to, void *from); | |
67 | ||
68 | #ifdef CONFIG_PPC_64K_PAGES | |
69 | static inline void copy_page(void *to, void *from) | |
70 | { | |
71 | unsigned int i; | |
72 | for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) { | |
73 | copy_4K_page(to, from); | |
74 | to += 4096; | |
75 | from += 4096; | |
76 | } | |
77 | } | |
78 | #else /* CONFIG_PPC_64K_PAGES */ | |
79 | static inline void copy_page(void *to, void *from) | |
80 | { | |
81 | copy_4K_page(to, from); | |
82 | } | |
83 | #endif /* CONFIG_PPC_64K_PAGES */ | |
84 | ||
85 | /* Log 2 of page table size */ | |
86 | extern u64 ppc64_pft_size; | |
87 | ||
88 | /* Large pages size */ | |
89 | extern unsigned int HPAGE_SHIFT; | |
90 | #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT) | |
91 | #define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
92 | #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
93 | ||
94 | #endif /* __ASSEMBLY__ */ | |
95 | ||
96 | #ifdef CONFIG_HUGETLB_PAGE | |
97 | ||
98 | #define HTLB_AREA_SHIFT 40 | |
99 | #define HTLB_AREA_SIZE (1UL << HTLB_AREA_SHIFT) | |
100 | #define GET_HTLB_AREA(x) ((x) >> HTLB_AREA_SHIFT) | |
101 | ||
102 | #define LOW_ESID_MASK(addr, len) (((1U << (GET_ESID(addr+len-1)+1)) \ | |
103 | - (1U << GET_ESID(addr))) & 0xffff) | |
104 | #define HTLB_AREA_MASK(addr, len) (((1U << (GET_HTLB_AREA(addr+len-1)+1)) \ | |
105 | - (1U << GET_HTLB_AREA(addr))) & 0xffff) | |
106 | ||
107 | #define ARCH_HAS_HUGEPAGE_ONLY_RANGE | |
108 | #define ARCH_HAS_PREPARE_HUGEPAGE_RANGE | |
109 | #define ARCH_HAS_SETCLEAR_HUGE_PTE | |
110 | ||
111 | #define touches_hugepage_low_range(mm, addr, len) \ | |
112 | (LOW_ESID_MASK((addr), (len)) & (mm)->context.low_htlb_areas) | |
113 | #define touches_hugepage_high_range(mm, addr, len) \ | |
114 | (HTLB_AREA_MASK((addr), (len)) & (mm)->context.high_htlb_areas) | |
115 | ||
116 | #define __within_hugepage_low_range(addr, len, segmask) \ | |
117 | ((LOW_ESID_MASK((addr), (len)) | (segmask)) == (segmask)) | |
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) \ | |
122 | ((HTLB_AREA_MASK((addr), (len)) | (zonemask)) == (zonemask)) | |
123 | #define within_hugepage_high_range(addr, len) \ | |
124 | __within_hugepage_high_range((addr), (len), \ | |
125 | current->mm->context.high_htlb_areas) | |
126 | ||
127 | #define is_hugepage_only_range(mm, addr, len) \ | |
128 | (touches_hugepage_high_range((mm), (addr), (len)) || \ | |
129 | touches_hugepage_low_range((mm), (addr), (len))) | |
130 | #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA | |
131 | ||
132 | #define in_hugepage_area(context, addr) \ | |
133 | (cpu_has_feature(CPU_FTR_16M_PAGE) && \ | |
134 | ( ((1 << GET_HTLB_AREA(addr)) & (context).high_htlb_areas) || \ | |
135 | ( ((addr) < 0x100000000L) && \ | |
136 | ((1 << GET_ESID(addr)) & (context).low_htlb_areas) ) ) ) | |
137 | ||
138 | #else /* !CONFIG_HUGETLB_PAGE */ | |
139 | ||
140 | #define in_hugepage_area(mm, addr) 0 | |
141 | ||
142 | #endif /* !CONFIG_HUGETLB_PAGE */ | |
143 | ||
144 | #ifdef MODULE | |
145 | #define __page_aligned __attribute__((__aligned__(PAGE_SIZE))) | |
146 | #else | |
147 | #define __page_aligned \ | |
148 | __attribute__((__aligned__(PAGE_SIZE), \ | |
149 | __section__(".data.page_aligned"))) | |
150 | #endif | |
151 | ||
152 | #define VM_DATA_DEFAULT_FLAGS \ | |
153 | (test_thread_flag(TIF_32BIT) ? \ | |
154 | VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64) | |
155 | ||
156 | /* | |
157 | * This is the default if a program doesn't have a PT_GNU_STACK | |
158 | * program header entry. The PPC64 ELF ABI has a non executable stack | |
159 | * stack by default, so in the absense of a PT_GNU_STACK program header | |
160 | * we turn execute permission off. | |
161 | */ | |
162 | #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \ | |
163 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
164 | ||
165 | #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \ | |
166 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) | |
167 | ||
168 | #define VM_STACK_DEFAULT_FLAGS \ | |
169 | (test_thread_flag(TIF_32BIT) ? \ | |
170 | VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64) | |
171 | ||
172 | #include <asm-generic/page.h> | |
173 | ||
174 | #endif /* _ASM_POWERPC_PAGE_64_H */ |