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
clear_page(void * addr)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 #ifndef __ASSEMBLY__
82
83 struct slice_mask {
84 u16 low_slices;
85 u16 high_slices;
86 };
87
88 struct mm_struct;
89
90 extern unsigned long slice_get_unmapped_area(unsigned long addr,
91 unsigned long len,
92 unsigned long flags,
93 unsigned int psize,
94 int topdown,
95 int use_cache);
96
97 extern unsigned int get_slice_psize(struct mm_struct *mm,
98 unsigned long addr);
99
100 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
101 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
102 extern void slice_set_range_psize(struct mm_struct *mm, unsigned long start,
103 unsigned long len, unsigned int psize);
104
105 #define slice_mm_new_context(mm) ((mm)->context.id == MMU_NO_CONTEXT)
106
107 #endif /* __ASSEMBLY__ */
108 #else
109 #define slice_init()
110 #ifdef CONFIG_PPC_STD_MMU_64
111 #define get_slice_psize(mm, addr) ((mm)->context.user_psize)
112 #define slice_set_user_psize(mm, psize) \
113 do { \
114 (mm)->context.user_psize = (psize); \
115 (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
116 } while (0)
117 #else /* CONFIG_PPC_STD_MMU_64 */
118 #ifdef CONFIG_PPC_64K_PAGES
119 #define get_slice_psize(mm, addr) MMU_PAGE_64K
120 #else /* CONFIG_PPC_64K_PAGES */
121 #define get_slice_psize(mm, addr) MMU_PAGE_4K
122 #endif /* !CONFIG_PPC_64K_PAGES */
123 #define slice_set_user_psize(mm, psize) do { BUG(); } while(0)
124 #endif /* !CONFIG_PPC_STD_MMU_64 */
125
126 #define slice_set_range_psize(mm, start, len, psize) \
127 slice_set_user_psize((mm), (psize))
128 #define slice_mm_new_context(mm) 1
129 #endif /* CONFIG_PPC_MM_SLICES */
130
131 #ifdef CONFIG_HUGETLB_PAGE
132
133 #ifdef CONFIG_PPC_MM_SLICES
134 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
135 #endif
136
137 #endif /* !CONFIG_HUGETLB_PAGE */
138
139 #define VM_DATA_DEFAULT_FLAGS \
140 (is_32bit_task() ? \
141 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
142
143 /*
144 * This is the default if a program doesn't have a PT_GNU_STACK
145 * program header entry. The PPC64 ELF ABI has a non executable stack
146 * stack by default, so in the absence of a PT_GNU_STACK program header
147 * we turn execute permission off.
148 */
149 #define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
150 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
151
152 #define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
153 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
154
155 #define VM_STACK_DEFAULT_FLAGS \
156 (is_32bit_task() ? \
157 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
158
159 #include <asm-generic/getorder.h>
160
161 #endif /* _ASM_POWERPC_PAGE_64_H */
162