Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
page_64.h
Go to the documentation of this file.
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_page(void *to, void *from);
63 
64 /* Log 2 of page table size */
65 extern u64 ppc64_pft_size;
66 
67 #endif /* __ASSEMBLY__ */
68 
69 #ifdef CONFIG_PPC_MM_SLICES
70 
71 #define SLICE_LOW_SHIFT 28
72 #define SLICE_HIGH_SHIFT 40
73 
74 #define SLICE_LOW_TOP (0x100000000ul)
75 #define SLICE_NUM_LOW (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
76 #define SLICE_NUM_HIGH (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
77 
78 #define GET_LOW_SLICE_INDEX(addr) ((addr) >> SLICE_LOW_SHIFT)
79 #define GET_HIGH_SLICE_INDEX(addr) ((addr) >> SLICE_HIGH_SHIFT)
80 
81 /*
82  * 1 bit per slice and we have one slice per 1TB
83  * Right now we support only 64TB.
84  * IF we change this we will have to change the type
85  * of high_slices
86  */
87 #define SLICE_MASK_SIZE 8
88 
89 #ifndef __ASSEMBLY__
90 
91 struct slice_mask {
92  u16 low_slices;
93  u64 high_slices;
94 };
95 
96 struct mm_struct;
97 
98 extern unsigned long slice_get_unmapped_area(unsigned long addr,
99  unsigned long len,
100  unsigned long flags,
101  unsigned int psize,
102  int topdown,
103  int use_cache);
104 
105 extern unsigned int get_slice_psize(struct mm_struct *mm,
106  unsigned long addr);
107 
108 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
109 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
110 extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
111  unsigned long len, unsigned int psize);
112 
113 #define slice_mm_new_context(mm) ((mm)->context.id == MMU_NO_CONTEXT)
114 
115 #endif /* __ASSEMBLY__ */
116 #else
117 #define slice_init()
118 #ifdef CONFIG_PPC_STD_MMU_64
119 #define get_slice_psize(mm, addr) ((mm)->context.user_psize)
120 #define slice_set_user_psize(mm, psize) \
121 do { \
122  (mm)->context.user_psize = (psize); \
123  (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
124 } while (0)
125 #else /* CONFIG_PPC_STD_MMU_64 */
126 #ifdef CONFIG_PPC_64K_PAGES
127 #define get_slice_psize(mm, addr) MMU_PAGE_64K
128 #else /* CONFIG_PPC_64K_PAGES */
129 #define get_slice_psize(mm, addr) MMU_PAGE_4K
130 #endif /* !CONFIG_PPC_64K_PAGES */
131 #define slice_set_user_psize(mm, psize) do { BUG(); } while(0)
132 #endif /* !CONFIG_PPC_STD_MMU_64 */
133 
134 #define slice_set_range_psize(mm, start, len, psize) \
135  slice_set_user_psize((mm), (psize))
136 #define slice_mm_new_context(mm) 1
137 #endif /* CONFIG_PPC_MM_SLICES */
138 
139 #ifdef CONFIG_HUGETLB_PAGE
140 
141 #ifdef CONFIG_PPC_MM_SLICES
142 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
143 #endif
144 
145 #endif /* !CONFIG_HUGETLB_PAGE */
146 
147 #define VM_DATA_DEFAULT_FLAGS \
148  (is_32bit_task() ? \
149  VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
150 
151 /*
152  * This is the default if a program doesn't have a PT_GNU_STACK
153  * program header entry. The PPC64 ELF ABI has a non executable stack
154  * stack by default, so in the absence of a PT_GNU_STACK program header
155  * we turn execute permission off.
156  */
157 #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
158  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
159 
160 #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
161  VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
162 
163 #define VM_STACK_DEFAULT_FLAGS \
164  (is_32bit_task() ? \
165  VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
166 
167 #include <asm-generic/getorder.h>
168 
169 #endif /* _ASM_POWERPC_PAGE_64_H */