floppy: remove dead/commented out code from floppy driver
[cascardo/linux.git] / include / asm-powerpc / page_64.h
1 #ifndef _ASM_POWERPC_PAGE_64_H
2 #define _ASM_POWERPC_PAGE_64_H
3 #ifdef __KERNEL__
4
5 /*
6  * Copyright (C) 2001 PPC64 Team, IBM Corp
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License
10  * as published by the Free Software Foundation; either version
11  * 2 of the License, or (at your option) any later version.
12  */
13
14 /*
15  * We always define HW_PAGE_SHIFT to 12 as use of 64K pages remains Linux
16  * specific, every notion of page number shared with the firmware, TCEs,
17  * iommu, etc... still uses a page size of 4K.
18  */
19 #define HW_PAGE_SHIFT           12
20 #define HW_PAGE_SIZE            (ASM_CONST(1) << HW_PAGE_SHIFT)
21 #define HW_PAGE_MASK            (~(HW_PAGE_SIZE-1))
22
23 /*
24  * PAGE_FACTOR is the number of bits factor between PAGE_SHIFT and
25  * HW_PAGE_SHIFT, that is 4K pages.
26  */
27 #define PAGE_FACTOR             (PAGE_SHIFT - HW_PAGE_SHIFT)
28
29 /* Segment size; normal 256M segments */
30 #define SID_SHIFT               28
31 #define SID_MASK                ASM_CONST(0xfffffffff)
32 #define ESID_MASK               0xfffffffff0000000UL
33 #define GET_ESID(x)             (((x) >> SID_SHIFT) & SID_MASK)
34
35 /* 1T segments */
36 #define SID_SHIFT_1T            40
37 #define SID_MASK_1T             0xffffffUL
38 #define ESID_MASK_1T            0xffffff0000000000UL
39 #define GET_ESID_1T(x)          (((x) >> SID_SHIFT_1T) & SID_MASK_1T)
40
41 #ifndef __ASSEMBLY__
42 #include <asm/cache.h>
43
44 typedef unsigned long pte_basic_t;
45
46 static __inline__ void clear_page(void *addr)
47 {
48         unsigned long lines, line_size;
49
50         line_size = ppc64_caches.dline_size;
51         lines = ppc64_caches.dlines_per_page;
52
53         __asm__ __volatile__(
54         "mtctr  %1      # clear_page\n\
55 1:      dcbz    0,%0\n\
56         add     %0,%0,%3\n\
57         bdnz+   1b"
58         : "=r" (addr)
59         : "r" (lines), "0" (addr), "r" (line_size)
60         : "ctr", "memory");
61 }
62
63 extern void copy_4K_page(void *to, void *from);
64
65 #ifdef CONFIG_PPC_64K_PAGES
66 static inline void copy_page(void *to, void *from)
67 {
68         unsigned int i;
69         for (i=0; i < (1 << (PAGE_SHIFT - 12)); i++) {
70                 copy_4K_page(to, from);
71                 to += 4096;
72                 from += 4096;
73         }
74 }
75 #else /* CONFIG_PPC_64K_PAGES */
76 static inline void copy_page(void *to, void *from)
77 {
78         copy_4K_page(to, from);
79 }
80 #endif /* CONFIG_PPC_64K_PAGES */
81
82 /* Log 2 of page table size */
83 extern u64 ppc64_pft_size;
84
85 /* Large pages size */
86 #ifdef CONFIG_HUGETLB_PAGE
87 extern unsigned int HPAGE_SHIFT;
88 #else
89 #define HPAGE_SHIFT PAGE_SHIFT
90 #endif
91 #define HPAGE_SIZE              ((1UL) << HPAGE_SHIFT)
92 #define HPAGE_MASK              (~(HPAGE_SIZE - 1))
93 #define HUGETLB_PAGE_ORDER      (HPAGE_SHIFT - PAGE_SHIFT)
94
95 #endif /* __ASSEMBLY__ */
96
97 #ifdef CONFIG_PPC_MM_SLICES
98
99 #define SLICE_LOW_SHIFT         28
100 #define SLICE_HIGH_SHIFT        40
101
102 #define SLICE_LOW_TOP           (0x100000000ul)
103 #define SLICE_NUM_LOW           (SLICE_LOW_TOP >> SLICE_LOW_SHIFT)
104 #define SLICE_NUM_HIGH          (PGTABLE_RANGE >> SLICE_HIGH_SHIFT)
105
106 #define GET_LOW_SLICE_INDEX(addr)       ((addr) >> SLICE_LOW_SHIFT)
107 #define GET_HIGH_SLICE_INDEX(addr)      ((addr) >> SLICE_HIGH_SHIFT)
108
109 #ifndef __ASSEMBLY__
110
111 struct slice_mask {
112         u16 low_slices;
113         u16 high_slices;
114 };
115
116 struct mm_struct;
117
118 extern unsigned long slice_get_unmapped_area(unsigned long addr,
119                                              unsigned long len,
120                                              unsigned long flags,
121                                              unsigned int psize,
122                                              int topdown,
123                                              int use_cache);
124
125 extern unsigned int get_slice_psize(struct mm_struct *mm,
126                                     unsigned long addr);
127
128 extern void slice_init_context(struct mm_struct *mm, unsigned int psize);
129 extern void slice_set_user_psize(struct mm_struct *mm, unsigned int psize);
130 #define slice_mm_new_context(mm)        ((mm)->context.id == 0)
131
132 #define ARCH_HAS_HUGEPAGE_ONLY_RANGE
133 extern int is_hugepage_only_range(struct mm_struct *m,
134                                   unsigned long addr,
135                                   unsigned long len);
136
137 #endif /* __ASSEMBLY__ */
138 #else
139 #define slice_init()
140 #define slice_set_user_psize(mm, psize)         \
141 do {                                            \
142         (mm)->context.user_psize = (psize);     \
143         (mm)->context.sllp = SLB_VSID_USER | mmu_psize_defs[(psize)].sllp; \
144 } while (0)
145 #define slice_mm_new_context(mm)        1
146 #endif /* CONFIG_PPC_MM_SLICES */
147
148 #ifdef CONFIG_HUGETLB_PAGE
149
150 #define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
151 #define ARCH_HAS_SETCLEAR_HUGE_PTE
152 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
153
154 #endif /* !CONFIG_HUGETLB_PAGE */
155
156 #ifdef MODULE
157 #define __page_aligned __attribute__((__aligned__(PAGE_SIZE)))
158 #else
159 #define __page_aligned \
160         __attribute__((__aligned__(PAGE_SIZE), \
161                 __section__(".data.page_aligned")))
162 #endif
163
164 #define VM_DATA_DEFAULT_FLAGS \
165         (test_thread_flag(TIF_32BIT) ? \
166          VM_DATA_DEFAULT_FLAGS32 : VM_DATA_DEFAULT_FLAGS64)
167
168 /*
169  * This is the default if a program doesn't have a PT_GNU_STACK
170  * program header entry. The PPC64 ELF ABI has a non executable stack
171  * stack by default, so in the absense of a PT_GNU_STACK program header
172  * we turn execute permission off.
173  */
174 #define VM_STACK_DEFAULT_FLAGS32        (VM_READ | VM_WRITE | VM_EXEC | \
175                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
176
177 #define VM_STACK_DEFAULT_FLAGS64        (VM_READ | VM_WRITE | \
178                                          VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
179
180 #define VM_STACK_DEFAULT_FLAGS \
181         (test_thread_flag(TIF_32BIT) ? \
182          VM_STACK_DEFAULT_FLAGS32 : VM_STACK_DEFAULT_FLAGS64)
183
184 #include <asm-generic/page.h>
185
186 #endif /* __KERNEL__ */
187 #endif /* _ASM_POWERPC_PAGE_64_H */