Merge branch 'slub-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm
[linux-2.6] / include / asm-powerpc / page_64.h
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
94 #endif /* __ASSEMBLY__ */
95
96 #ifdef CONFIG_PPC_MM_SLICES
97
98 #define SLICE_LOW_SHIFT         28
99 #define SLICE_HIGH_SHIFT        40
100
101 #define SLICE_LOW_TOP           (0x100000000ul)
102 #define SLICE_NUM_LOW           (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
103 #define SLICE_NUM_HIGH          (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
104
105 #define GET_LOW_SLICE_INDEX(addr)       ((addr) >> SLICE_LOW_SHIFT)
106 #define GET_HIGH_SLICE_INDEX(addr)      ((addr) >> SLICE_HIGH_SHIFT)
107
108 #ifndef __ASSEMBLY__
109
110 struct slice_mask {
111         u16 low_slices;
112         u16 high_slices;
113 };
114
115 struct mm_struct;
116
117 extern unsigned long slice_get_unmapped_area(unsigned long addr,
118                                              unsigned long len,
119                                              unsigned long flags,
120                                              unsigned int psize,
121                                              int topdown,
122                                              int use_cache);
123
124 extern unsigned int get_slice_psize(struct mm_struct *mm,
125                                     unsigned long addr);
126
127 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
128 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
129 #define slice_mm_new_context(mm)        ((mm)->context.id == 0)
130
131 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
132 extern int is_hugepage_only_range(struct mm_struct *m,
133                                   unsigned long addr,
134                                   unsigned long len);
135
136 #endif /* __ASSEMBLY__ */
137 #else
138 #define slice_init()
139 #define slice_set_user_psize(mm, psize)         \
140 do {                                            \
141         (mm)->context.user_psize = (psize);     \
142         (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
143 } while (0)
144 #define slice_mm_new_context(mm)        1
145 #endif /* CONFIG_PPC_MM_SLICES */
146
147 #ifdef CONFIG_HUGETLB_PAGE
148
149 #define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
150 #define ARCH_HAS_SETCLEAR_HUGE_PTE
151 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
152
153 #endif /* !CONFIG_HUGETLB_PAGE */
154
155 #ifdef MODULE
156 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
157 #else
158 #define __page_aligned \
159         __attribute__((__aligned__(PAGE_SIZE), \
160                 __section__(".data.page_aligned")))
161 #endif
162
163 #define VM_DATA_DEFAULT_FLAGS \
164         (test_thread_flag(TIF_32BIT) ? \
165          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
166
167 /*
168  * This is the default if a program doesn't have a PT_GNU_STACK
169  * program header entry. The PPC64 ELF ABI has a non executable stack
170  * stack by default, so in the absense of a PT_GNU_STACK program header
171  * we turn execute permission off.
172  */
173 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
174                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
175
176 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
177                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
178
179 #define VM_STACK_DEFAULT_FLAGS \
180         (test_thread_flag(TIF_32BIT) ? \
181          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
182
183 #include <asm-generic/page.h>
184
185 #endif /* _ASM_POWERPC_PAGE_64_H */