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1 | #ifndef _ASM_POWERPC_PGTABLE_64K_H |
2 | #define _ASM_POWERPC_PGTABLE_64K_H | |
3 | #ifdef __KERNEL__ | |
4 | ||
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5 | #include <asm-generic/pgtable-nopud.h> |
6 | ||
7 | ||
8 | #define PTE_INDEX_SIZE 12 | |
9 | #define PMD_INDEX_SIZE 12 | |
10 | #define PUD_INDEX_SIZE 0 | |
11 | #define PGD_INDEX_SIZE 4 | |
12 | ||
13 | #define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE) | |
14 | #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE) | |
15 | #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE) | |
16 | ||
17 | #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) | |
18 | #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE) | |
19 | #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) | |
20 | ||
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21 | /* With 4k base page size, hugepage PTEs go at the PMD level */ |
22 | #define MIN_HUGEPTE_SHIFT PAGE_SHIFT | |
23 | ||
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24 | /* PMD_SHIFT determines what a second-level page table entry can map */ |
25 | #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE) | |
26 | #define PMD_SIZE (1UL << PMD_SHIFT) | |
27 | #define PMD_MASK (~(PMD_SIZE-1)) | |
28 | ||
29 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ | |
30 | #define PGDIR_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE) | |
31 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) | |
32 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) | |
33 | ||
34 | /* Additional PTE bits (don't change without checking asm in hash_low.S) */ | |
35 | #define _PAGE_HPTE_SUB 0x0ffff000 /* combo only: sub pages HPTE bits */ | |
36 | #define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */ | |
37 | #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */ | |
38 | #define _PAGE_F_SECOND 0x00008000 /* full page: hidx bits */ | |
39 | #define _PAGE_F_GIX 0x00007000 /* full page: hidx bits */ | |
40 | ||
41 | /* PTE flags to conserve for HPTE identification */ | |
42 | #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_HPTE_SUB |\ | |
43 | _PAGE_COMBO) | |
44 | ||
45 | /* Shift to put page number into pte. | |
46 | * | |
47 | * That gives us a max RPN of 32 bits, which means a max of 48 bits | |
48 | * of addressable physical space. | |
49 | * We could get 3 more bits here by setting PTE_RPN_SHIFT to 29 but | |
50 | * 32 makes PTEs more readable for debugging for now :) | |
51 | */ | |
52 | #define PTE_RPN_SHIFT (32) | |
53 | #define PTE_RPN_MAX (1UL << (64 - PTE_RPN_SHIFT)) | |
54 | #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) | |
55 | ||
56 | /* _PAGE_CHG_MASK masks of bits that are to be preserved accross | |
57 | * pgprot changes | |
58 | */ | |
59 | #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ | |
60 | _PAGE_ACCESSED) | |
61 | ||
62 | /* Bits to mask out from a PMD to get to the PTE page */ | |
63 | #define PMD_MASKED_BITS 0x1ff | |
64 | /* Bits to mask out from a PGD/PUD to get to the PMD page */ | |
65 | #define PUD_MASKED_BITS 0x1ff | |
66 | ||
67 | #ifndef __ASSEMBLY__ | |
68 | ||
69 | /* Manipulate "rpte" values */ | |
70 | #define __real_pte(e,p) ((real_pte_t) { \ | |
71 | (e), pte_val(*((p) + PTRS_PER_PTE)) }) | |
72 | #define __rpte_to_hidx(r,index) ((pte_val((r).pte) & _PAGE_COMBO) ? \ | |
73 | (((r).hidx >> ((index)<<2)) & 0xf) : ((pte_val((r).pte) >> 12) & 0xf)) | |
74 | #define __rpte_to_pte(r) ((r).pte) | |
75 | #define __rpte_sub_valid(rpte, index) \ | |
76 | (pte_val(rpte.pte) & (_PAGE_HPTE_SUB0 >> (index))) | |
77 | ||
78 | ||
79 | /* Trick: we set __end to va + 64k, which happens works for | |
80 | * a 16M page as well as we want only one iteration | |
81 | */ | |
82 | #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ | |
83 | do { \ | |
84 | unsigned long __end = va + PAGE_SIZE; \ | |
85 | unsigned __split = (psize == MMU_PAGE_4K || \ | |
86 | psize == MMU_PAGE_64K_AP); \ | |
87 | shift = mmu_psize_defs[psize].shift; \ | |
88 | for (index = 0; va < __end; index++, va += (1 << shift)) { \ | |
89 | if (!__split || __rpte_sub_valid(rpte, index)) do { \ | |
90 | ||
91 | #define pte_iterate_hashed_end() } while(0); } } while(0) | |
92 | ||
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93 | #define pte_pagesize_index(pte) \ |
94 | (((pte) & _PAGE_COMBO)? MMU_PAGE_4K: MMU_PAGE_64K) | |
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95 | |
96 | #endif /* __ASSEMBLY__ */ | |
88ced031 AB |
97 | #endif /* __KERNEL__ */ |
98 | #endif /* _ASM_POWERPC_PGTABLE_64K_H */ |