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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - arch/powerpc/include/asm/book3s/64/hash.h
1 #ifndef _ASM_POWERPC_BOOK3S_64_HASH_H
2 #define _ASM_POWERPC_BOOK3S_64_HASH_H
6 * Common bits between 4K and 64K pages in a linux-style PTE.
7 * Additional bits may be defined in pgtable-hash64-*.h
10 #define H_PTE_NONE_MASK _PAGE_HPTEFLAGS
11 #define H_PAGE_F_GIX_SHIFT 56
12 #define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */
13 #define H_PAGE_F_SECOND _RPAGE_RSV2 /* HPTE is in 2ndary HPTEG */
14 #define H_PAGE_F_GIX (_RPAGE_RSV3 | _RPAGE_RSV4 | _RPAGE_RPN44)
15 #define H_PAGE_HASHPTE _RPAGE_RPN43 /* PTE has associated HPTE */
17 #ifdef CONFIG_PPC_64K_PAGES
18 #include <asm/book3s/64/hash-64k.h>
20 #include <asm/book3s/64/hash-4k.h>
24 * Size of EA range mapped by our pagetables.
26 #define H_PGTABLE_EADDR_SIZE (H_PTE_INDEX_SIZE + H_PMD_INDEX_SIZE + \
27 H_PUD_INDEX_SIZE + H_PGD_INDEX_SIZE + PAGE_SHIFT)
28 #define H_PGTABLE_RANGE (ASM_CONST(1) << H_PGTABLE_EADDR_SIZE)
30 #if defined(CONFIG_TRANSPARENT_HUGEPAGE) && defined(CONFIG_PPC_64K_PAGES)
32 * only with hash 64k we need to use the second half of pmd page table
33 * to store pointer to deposited pgtable_t
35 #define H_PMD_CACHE_INDEX (H_PMD_INDEX_SIZE + 1)
37 #define H_PMD_CACHE_INDEX H_PMD_INDEX_SIZE
40 * Define the address range of the kernel non-linear virtual area
42 #define H_KERN_VIRT_START ASM_CONST(0xD000000000000000)
43 #define H_KERN_VIRT_SIZE ASM_CONST(0x0000100000000000)
46 * The vmalloc space starts at the beginning of that region, and
47 * occupies half of it on hash CPUs and a quarter of it on Book3E
48 * (we keep a quarter for the virtual memmap)
50 #define H_VMALLOC_START H_KERN_VIRT_START
51 #define H_VMALLOC_SIZE (H_KERN_VIRT_SIZE >> 1)
52 #define H_VMALLOC_END (H_VMALLOC_START + H_VMALLOC_SIZE)
57 #define REGION_SHIFT 60UL
58 #define REGION_MASK (0xfUL << REGION_SHIFT)
59 #define REGION_ID(ea) (((unsigned long)(ea)) >> REGION_SHIFT)
61 #define VMALLOC_REGION_ID (REGION_ID(H_VMALLOC_START))
62 #define KERNEL_REGION_ID (REGION_ID(PAGE_OFFSET))
63 #define VMEMMAP_REGION_ID (0xfUL) /* Server only */
64 #define USER_REGION_ID (0UL)
67 * Defines the address of the vmemap area, in its own region on
70 #define H_VMEMMAP_BASE (VMEMMAP_REGION_ID << REGION_SHIFT)
72 #ifdef CONFIG_PPC_MM_SLICES
73 #define HAVE_ARCH_UNMAPPED_AREA
74 #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
75 #endif /* CONFIG_PPC_MM_SLICES */
79 #define _PTEIDX_SECONDARY 0x8
80 #define _PTEIDX_GROUP_IX 0x7
82 #define H_PMD_BAD_BITS (PTE_TABLE_SIZE-1)
83 #define H_PUD_BAD_BITS (PMD_TABLE_SIZE-1)
86 #define hash__pmd_bad(pmd) (pmd_val(pmd) & H_PMD_BAD_BITS)
87 #define hash__pud_bad(pud) (pud_val(pud) & H_PUD_BAD_BITS)
88 static inline int hash__pgd_bad(pgd_t pgd
)
90 return (pgd_val(pgd
) == 0);
92 #ifdef CONFIG_STRICT_KERNEL_RWX
93 extern void hash__mark_rodata_ro(void);
96 extern void hpte_need_flush(struct mm_struct
*mm
, unsigned long addr
,
97 pte_t
*ptep
, unsigned long pte
, int huge
);
98 extern unsigned long htab_convert_pte_flags(unsigned long pteflags
);
99 /* Atomic PTE updates */
100 static inline unsigned long hash__pte_update(struct mm_struct
*mm
,
102 pte_t
*ptep
, unsigned long clr
,
106 __be64 old_be
, tmp_be
;
109 __asm__
__volatile__(
110 "1: ldarx %0,0,%3 # pte_update\n\
117 : "=&r" (old_be
), "=&r" (tmp_be
), "=m" (*ptep
)
118 : "r" (ptep
), "r" (cpu_to_be64(clr
)), "m" (*ptep
),
119 "r" (cpu_to_be64(H_PAGE_BUSY
)), "r" (cpu_to_be64(set
))
121 /* huge pages use the old page table lock */
123 assert_pte_locked(mm
, addr
);
125 old
= be64_to_cpu(old_be
);
126 if (old
& H_PAGE_HASHPTE
)
127 hpte_need_flush(mm
, addr
, ptep
, old
, huge
);
132 /* Set the dirty and/or accessed bits atomically in a linux PTE, this
133 * function doesn't need to flush the hash entry
135 static inline void hash__ptep_set_access_flags(pte_t
*ptep
, pte_t entry
)
137 __be64 old
, tmp
, val
, mask
;
139 mask
= cpu_to_be64(_PAGE_DIRTY
| _PAGE_ACCESSED
| _PAGE_READ
| _PAGE_WRITE
|
140 _PAGE_EXEC
| _PAGE_SOFT_DIRTY
);
142 val
= pte_raw(entry
) & mask
;
144 __asm__
__volatile__(
151 :"=&r" (old
), "=&r" (tmp
), "=m" (*ptep
)
152 :"r" (val
), "r" (ptep
), "m" (*ptep
), "r" (cpu_to_be64(H_PAGE_BUSY
))
156 static inline int hash__pte_same(pte_t pte_a
, pte_t pte_b
)
158 return (((pte_raw(pte_a
) ^ pte_raw(pte_b
)) & ~cpu_to_be64(_PAGE_HPTEFLAGS
)) == 0);
161 static inline int hash__pte_none(pte_t pte
)
163 return (pte_val(pte
) & ~H_PTE_NONE_MASK
) == 0;
166 /* This low level function performs the actual PTE insertion
167 * Setting the PTE depends on the MMU type and other factors. It's
168 * an horrible mess that I'm not going to try to clean up now but
169 * I'm keeping it in one place rather than spread around
171 static inline void hash__set_pte_at(struct mm_struct
*mm
, unsigned long addr
,
172 pte_t
*ptep
, pte_t pte
, int percpu
)
175 * Anything else just stores the PTE normally. That covers all 64-bit
176 * cases, and 32-bit non-hash with 32-bit PTEs.
181 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
182 extern void hpte_do_hugepage_flush(struct mm_struct
*mm
, unsigned long addr
,
183 pmd_t
*pmdp
, unsigned long old_pmd
);
185 static inline void hpte_do_hugepage_flush(struct mm_struct
*mm
,
186 unsigned long addr
, pmd_t
*pmdp
,
187 unsigned long old_pmd
)
189 WARN(1, "%s called with THP disabled\n", __func__
);
191 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
194 extern int hash__map_kernel_page(unsigned long ea
, unsigned long pa
,
195 unsigned long flags
);
196 extern int __meminit
hash__vmemmap_create_mapping(unsigned long start
,
197 unsigned long page_size
,
199 extern void hash__vmemmap_remove_mapping(unsigned long start
,
200 unsigned long page_size
);
202 int hash__create_section_mapping(unsigned long start
, unsigned long end
);
203 int hash__remove_section_mapping(unsigned long start
, unsigned long end
);
205 #endif /* !__ASSEMBLY__ */
206 #endif /* __KERNEL__ */
207 #endif /* _ASM_POWERPC_BOOK3S_64_HASH_H */