1 #ifndef _ASM_POWERPC_PGTABLE_64K_H
2 #define _ASM_POWERPC_PGTABLE_64K_H
4 #include <asm-generic/pgtable-nopud.h>
7 #define PTE_INDEX_SIZE 12
8 #define PMD_INDEX_SIZE 12
9 #define PUD_INDEX_SIZE 0
10 #define PGD_INDEX_SIZE 4
12 #define PTE_TABLE_SIZE (sizeof(real_pte_t) << PTE_INDEX_SIZE)
13 #define PMD_TABLE_SIZE (sizeof(pmd_t) << PMD_INDEX_SIZE)
14 #define PGD_TABLE_SIZE (sizeof(pgd_t) << PGD_INDEX_SIZE)
16 #define PTRS_PER_PTE (1 << PTE_INDEX_SIZE)
17 #define PTRS_PER_PMD (1 << PMD_INDEX_SIZE)
18 #define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
20 /* With 4k base page size, hugepage PTEs go at the PMD level */
21 #define MIN_HUGEPTE_SHIFT PAGE_SHIFT
23 /* PMD_SHIFT determines what a second-level page table entry can map */
24 #define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
25 #define PMD_SIZE (1UL << PMD_SHIFT)
26 #define PMD_MASK (~(PMD_SIZE-1))
28 /* PGDIR_SHIFT determines what a third-level page table entry can map */
29 #define PGDIR_SHIFT (PMD_SHIFT + PMD_INDEX_SIZE)
30 #define PGDIR_SIZE (1UL << PGDIR_SHIFT)
31 #define PGDIR_MASK (~(PGDIR_SIZE-1))
33 /* Additional PTE bits (don't change without checking asm in hash_low.S) */
34 #define _PAGE_HPTE_SUB 0x0ffff000 /* combo only: sub pages HPTE bits */
35 #define _PAGE_HPTE_SUB0 0x08000000 /* combo only: first sub page */
36 #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */
37 #define _PAGE_4K_PFN 0x20000000 /* PFN is for a single 4k page */
39 /* Note the full page bits must be in the same location as for normal
40 * 4k pages as the same asssembly will be used to insert 64K pages
41 * wether the kernel has CONFIG_PPC_64K_PAGES or not
43 #define _PAGE_F_SECOND 0x00008000 /* full page: hidx bits */
44 #define _PAGE_F_GIX 0x00007000 /* full page: hidx bits */
46 /* PTE flags to conserve for HPTE identification */
47 #define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_HPTE_SUB |\
50 /* Shift to put page number into pte.
52 * That gives us a max RPN of 34 bits, which means a max of 50 bits
53 * of addressable physical space, or 46 bits for the special 4k PFNs.
55 #define PTE_RPN_SHIFT (30)
56 #define PTE_RPN_MAX (1UL << (64 - PTE_RPN_SHIFT))
57 #define PTE_RPN_MASK (~((1UL<<PTE_RPN_SHIFT)-1))
59 /* _PAGE_CHG_MASK masks of bits that are to be preserved accross
62 #define _PAGE_CHG_MASK (PTE_RPN_MASK | _PAGE_HPTEFLAGS | _PAGE_DIRTY | \
65 /* Bits to mask out from a PMD to get to the PTE page */
66 #define PMD_MASKED_BITS 0x1ff
67 /* Bits to mask out from a PGD/PUD to get to the PMD page */
68 #define PUD_MASKED_BITS 0x1ff
70 /* Manipulate "rpte" values */
71 #define __real_pte(e,p) ((real_pte_t) { \
72 (e), pte_val(*((p) + PTRS_PER_PTE)) })
73 #define __rpte_to_hidx(r,index) ((pte_val((r).pte) & _PAGE_COMBO) ? \
74 (((r).hidx >> ((index)<<2)) & 0xf) : ((pte_val((r).pte) >> 12) & 0xf))
75 #define __rpte_to_pte(r) ((r).pte)
76 #define __rpte_sub_valid(rpte, index) \
77 (pte_val(rpte.pte) & (_PAGE_HPTE_SUB0 >> (index)))
80 /* Trick: we set __end to va + 64k, which happens works for
81 * a 16M page as well as we want only one iteration
83 #define pte_iterate_hashed_subpages(rpte, psize, va, index, shift) \
85 unsigned long __end = va + PAGE_SIZE; \
86 unsigned __split = (psize == MMU_PAGE_4K || \
87 psize == MMU_PAGE_64K_AP); \
88 shift = mmu_psize_defs[psize].shift; \
89 for (index = 0; va < __end; index++, va += (1 << shift)) { \
90 if (!__split || __rpte_sub_valid(rpte, index)) do { \
92 #define pte_iterate_hashed_end() } while(0); } } while(0)
94 #define pte_pagesize_index(mm, addr, pte) \
95 (((pte) & _PAGE_COMBO)? MMU_PAGE_4K: MMU_PAGE_64K)
97 #define remap_4k_pfn(vma, addr, pfn, prot) \
98 remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, \
99 __pgprot(pgprot_val((prot)) | _PAGE_4K_PFN))
101 #endif /* _ASM_POWERPC_PGTABLE_64K_H */