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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/* 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
43typedef unsigned long pte_basic_t;
44
45static __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\
541: 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
62extern void copy_4K_page(void *to, void *from);
63
64#ifdef CONFIG_PPC_64K_PAGES
65static 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 */
75static 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 */
82extern u64 ppc64_pft_size;
83
84/* Large pages size */
85#ifdef CONFIG_HUGETLB_PAGE
86extern 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
110struct slice_mask {
111 u16 low_slices;
112 u16 high_slices;
113};
114
115struct mm_struct;
116
117extern 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
124extern unsigned int get_slice_psize(struct mm_struct *mm,
125 unsigned long addr);
126
127extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
128extern 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#endif /* __ASSEMBLY__ */
132#else
133#define slice_init()
134#define slice_set_user_psize(mm, psize) \
135do { \
136 (mm)->context.user_psize = (psize); \
137 (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
138} while (0)
139#define slice_mm_new_context(mm) 1
140#endif /* CONFIG_PPC_MM_SLICES */
141
142#ifdef CONFIG_HUGETLB_PAGE
143
144#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
145
146#endif /* !CONFIG_HUGETLB_PAGE */
147
148#ifdef MODULE
149#define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
150#else
151#define __page_aligned \
152 __attribute__((__aligned__(PAGE_SIZE), \
153 __section__(".data.page_aligned")))
154#endif
155
156#define VM_DATA_DEFAULT_FLAGS \
157 (test_thread_flag(TIF_32BIT) ? \
158 VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
159
160/*
161 * This is the default if a program doesn't have a PT_GNU_STACK
162 * program header entry. The PPC64 ELF ABI has a non executable stack
163 * stack by default, so in the absense of a PT_GNU_STACK program header
164 * we turn execute permission off.
165 */
166#define VM_STACK_DEFAULT_FLAGS32 (VM_READ | VM_WRITE | VM_EXEC | \
167 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
168
169#define VM_STACK_DEFAULT_FLAGS64 (VM_READ | VM_WRITE | \
170 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
171
172#define VM_STACK_DEFAULT_FLAGS \
173 (test_thread_flag(TIF_32BIT) ? \
174 VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
175
176#include <asm-generic/page.h>
177
178#endif /* _ASM_POWERPC_PAGE_64_H */