Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1 | #include <asm-generic/pgtable-nopud.h> |
| 2 | |
| 3 | |
| 4 | #define PTE_INDEX_SIZE 12 |
| 5 | #define PMD_INDEX_SIZE 12 |
| 6 | #define PUD_INDEX_SIZE 0 |
| 7 | #define PGD_INDEX_SIZE 4 |
| 8 | |
| 9 | #define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE) |
| 10 | #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE) |
| 11 | #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE) |
| 12 | |
| 13 | #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) |
| 14 | #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE) |
| 15 | #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) |
| 16 | |
David Gibson | 7d24f0b | 2005-11-07 00:57:52 -0800 | [diff] [blame^] | 17 | /* With 4k base page size, hugepage PTEs go at the PMD level */ |
| 18 | #define MIN_HUGEPTE_SHIFT PAGE_SHIFT |
| 19 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 20 | /* PMD_SHIFT determines what a second-level page table entry can map */ |
| 21 | #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE) |
| 22 | #define PMD_SIZE (1UL << PMD_SHIFT) |
| 23 | #define PMD_MASK (~(PMD_SIZE-1)) |
| 24 | |
| 25 | /* PGDIR_SHIFT determines what a third-level page table entry can map */ |
| 26 | #define PGDIR_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE) |
| 27 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| 28 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 29 | |
| 30 | /* Additional PTE bits (don't change without checking asm in hash_low.S) */ |
| 31 | #define _PAGE_HPTE_SUB 0x0ffff000 /* combo only: sub pages HPTE bits */ |
| 32 | #define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */ |
| 33 | #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */ |
| 34 | #define _PAGE_F_SECOND 0x00008000 /* full page: hidx bits */ |
| 35 | #define _PAGE_F_GIX 0x00007000 /* full page: hidx bits */ |
| 36 | |
| 37 | /* PTE flags to conserve for HPTE identification */ |
| 38 | #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_HPTE_SUB |\ |
| 39 | _PAGE_COMBO) |
| 40 | |
| 41 | /* Shift to put page number into pte. |
| 42 | * |
| 43 | * That gives us a max RPN of 32 bits, which means a max of 48 bits |
| 44 | * of addressable physical space. |
| 45 | * We could get 3 more bits here by setting PTE_RPN_SHIFT to 29 but |
| 46 | * 32 makes PTEs more readable for debugging for now :) |
| 47 | */ |
| 48 | #define PTE_RPN_SHIFT (32) |
| 49 | #define PTE_RPN_MAX (1UL << (64 - PTE_RPN_SHIFT)) |
| 50 | #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1)) |
| 51 | |
| 52 | /* _PAGE_CHG_MASK masks of bits that are to be preserved accross |
| 53 | * pgprot changes |
| 54 | */ |
| 55 | #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \ |
| 56 | _PAGE_ACCESSED) |
| 57 | |
| 58 | /* Bits to mask out from a PMD to get to the PTE page */ |
| 59 | #define PMD_MASKED_BITS 0x1ff |
| 60 | /* Bits to mask out from a PGD/PUD to get to the PMD page */ |
| 61 | #define PUD_MASKED_BITS 0x1ff |
| 62 | |
| 63 | #ifndef __ASSEMBLY__ |
| 64 | |
| 65 | /* Manipulate "rpte" values */ |
| 66 | #define __real_pte(e,p) ((real_pte_t) { \ |
| 67 | (e), pte_val(*((p) + PTRS_PER_PTE)) }) |
| 68 | #define __rpte_to_hidx(r,index) ((pte_val((r).pte) & _PAGE_COMBO) ? \ |
| 69 | (((r).hidx >> ((index)<<2)) & 0xf) : ((pte_val((r).pte) >> 12) & 0xf)) |
| 70 | #define __rpte_to_pte(r) ((r).pte) |
| 71 | #define __rpte_sub_valid(rpte, index) \ |
| 72 | (pte_val(rpte.pte) & (_PAGE_HPTE_SUB0 >> (index))) |
| 73 | |
| 74 | |
| 75 | /* Trick: we set __end to va + 64k, which happens works for |
| 76 | * a 16M page as well as we want only one iteration |
| 77 | */ |
| 78 | #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ |
| 79 | do { \ |
| 80 | unsigned long __end = va + PAGE_SIZE; \ |
| 81 | unsigned __split = (psize == MMU_PAGE_4K || \ |
| 82 | psize == MMU_PAGE_64K_AP); \ |
| 83 | shift = mmu_psize_defs[psize].shift; \ |
| 84 | for (index = 0; va < __end; index++, va += (1 << shift)) { \ |
| 85 | if (!__split || __rpte_sub_valid(rpte, index)) do { \ |
| 86 | |
| 87 | #define pte_iterate_hashed_end() } while(0); } } while(0) |
| 88 | |
| 89 | |
| 90 | #endif /* __ASSEMBLY__ */ |