Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Entries per page directory level. The PTE level must use a 64b record |
| 3 | * for each page table entry. The PMD and PGD level use a 32b record for |
| 4 | * each entry by assuming that each entry is page aligned. |
| 5 | */ |
| 6 | #define PTE_INDEX_SIZE 9 |
| 7 | #define PMD_INDEX_SIZE 7 |
| 8 | #define PUD_INDEX_SIZE 7 |
| 9 | #define PGD_INDEX_SIZE 9 |
| 10 | |
| 11 | #define PTE_TABLE_SIZE (sizeof(pte_t) << PTE_INDEX_SIZE) |
| 12 | #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE) |
| 13 | #define PUD_TABLE_SIZE (sizeof(pud_t) << PUD_INDEX_SIZE) |
| 14 | #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE) |
| 15 | |
| 16 | #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE) |
| 17 | #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE) |
| 18 | #define PTRS_PER_PUD (1 << PMD_INDEX_SIZE) |
| 19 | #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE) |
| 20 | |
| 21 | /* PMD_SHIFT determines what a second-level page table entry can map */ |
| 22 | #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE) |
| 23 | #define PMD_SIZE (1UL << PMD_SHIFT) |
| 24 | #define PMD_MASK (~(PMD_SIZE-1)) |
| 25 | |
David Gibson | 7d24f0b | 2005-11-07 00:57:52 -0800 | [diff] [blame] | 26 | /* With 4k base page size, hugepage PTEs go at the PMD level */ |
| 27 | #define MIN_HUGEPTE_SHIFT PMD_SHIFT |
| 28 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 29 | /* PUD_SHIFT determines what a third-level page table entry can map */ |
| 30 | #define PUD_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE) |
| 31 | #define PUD_SIZE (1UL << PUD_SHIFT) |
| 32 | #define PUD_MASK (~(PUD_SIZE-1)) |
| 33 | |
| 34 | /* PGDIR_SHIFT determines what a fourth-level page table entry can map */ |
| 35 | #define PGDIR_SHIFT (PUD_SHIFT + PUD_INDEX_SIZE) |
| 36 | #define PGDIR_SIZE (1UL << PGDIR_SHIFT) |
| 37 | #define PGDIR_MASK (~(PGDIR_SIZE-1)) |
| 38 | |
| 39 | /* PTE bits */ |
| 40 | #define _PAGE_SECONDARY 0x8000 /* software: HPTE is in secondary group */ |
| 41 | #define _PAGE_GROUP_IX 0x7000 /* software: HPTE index within group */ |
| 42 | #define _PAGE_F_SECOND _PAGE_SECONDARY |
| 43 | #define _PAGE_F_GIX _PAGE_GROUP_IX |
| 44 | |
| 45 | /* PTE flags to conserve for HPTE identification */ |
| 46 | #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | \ |
| 47 | _PAGE_SECONDARY | _PAGE_GROUP_IX) |
| 48 | |
| 49 | /* PAGE_MASK gives the right answer below, but only by accident */ |
| 50 | /* It should be preserving the high 48 bits and then specifically */ |
| 51 | /* preserving _PAGE_SECONDARY | _PAGE_GROUP_IX */ |
| 52 | #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | \ |
| 53 | _PAGE_HPTEFLAGS) |
| 54 | |
| 55 | /* Bits to mask out from a PMD to get to the PTE page */ |
| 56 | #define PMD_MASKED_BITS 0 |
| 57 | /* Bits to mask out from a PUD to get to the PMD page */ |
| 58 | #define PUD_MASKED_BITS 0 |
| 59 | /* Bits to mask out from a PGD to get to the PUD page */ |
| 60 | #define PGD_MASKED_BITS 0 |
| 61 | |
| 62 | /* shift to put page number into pte */ |
| 63 | #define PTE_RPN_SHIFT (17) |
| 64 | |
David Gibson | 20f4eb3 | 2006-02-20 14:05:56 +1100 | [diff] [blame] | 65 | #ifdef STRICT_MM_TYPECHECKS |
| 66 | #define __real_pte(e,p) ((real_pte_t){(e)}) |
| 67 | #define __rpte_to_pte(r) ((r).pte) |
| 68 | #else |
| 69 | #define __real_pte(e,p) (e) |
| 70 | #define __rpte_to_pte(r) (__pte(r)) |
| 71 | #endif |
| 72 | #define __rpte_to_hidx(r,index) (pte_val(__rpte_to_pte(r)) >> 12) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 73 | |
| 74 | #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \ |
| 75 | do { \ |
| 76 | index = 0; \ |
| 77 | shift = mmu_psize_defs[psize].shift; \ |
| 78 | |
| 79 | #define pte_iterate_hashed_end() } while(0) |
| 80 | |
Paul Mackerras | bf72aeb | 2006-06-15 10:45:18 +1000 | [diff] [blame] | 81 | #define pte_pagesize_index(pte) MMU_PAGE_4K |
| 82 | |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 83 | /* |
| 84 | * 4-level page tables related bits |
| 85 | */ |
| 86 | |
| 87 | #define pgd_none(pgd) (!pgd_val(pgd)) |
| 88 | #define pgd_bad(pgd) (pgd_val(pgd) == 0) |
| 89 | #define pgd_present(pgd) (pgd_val(pgd) != 0) |
| 90 | #define pgd_clear(pgdp) (pgd_val(*(pgdp)) = 0) |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame^] | 91 | #define pgd_page_vaddr(pgd) (pgd_val(pgd) & ~PGD_MASKED_BITS) |
| 92 | #define pgd_page(pgd) virt_to_page(pgd_page_vaddr(pgd)) |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 93 | |
| 94 | #define pud_offset(pgdp, addr) \ |
Dave McCracken | 46a82b2 | 2006-09-25 23:31:48 -0700 | [diff] [blame^] | 95 | (((pud_t *) pgd_page_vaddr(*(pgdp))) + \ |
Benjamin Herrenschmidt | 3c726f8 | 2005-11-07 11:06:55 +1100 | [diff] [blame] | 96 | (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))) |
| 97 | |
| 98 | #define pud_ERROR(e) \ |
David Gibson | 141aa59 | 2006-03-03 16:24:06 +1100 | [diff] [blame] | 99 | printk("%s:%d: bad pud %08lx.\n", __FILE__, __LINE__, pud_val(e)) |