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| 2 | |
| 3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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| 4 | *
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| 5 | * vineetg: June 2011
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| 6 | * -"/proc/meminfo | grep PageTables" kept on increasing
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| 7 | * Recently added pgtable dtor was not getting called.
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| 8 | *
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| 9 | * vineetg: May 2011
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| 10 | * -Variable pg-sz means that Page Tables could be variable sized themselves
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| 11 | * So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
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| 12 | * -Page Table size capped to max 1 to save memory - hence verified.
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| 13 | * -Since these deal with constants, gcc compile-time optimizes them.
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| 14 | *
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| 15 | * vineetg: Nov 2010
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| 16 | * -Added pgtable ctor/dtor used for pgtable mem accounting
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| 17 | *
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| 18 | * vineetg: April 2010
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| 19 | * -Switched pgtable_t from being struct page * to unsigned long
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| 20 | * =Needed so that Page Table allocator (pte_alloc_one) is not forced to
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| 21 | * deal with struct page. That way in future we can make it allocate
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| 22 | * multiple PG Tbls in one Page Frame
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| 23 | * =sweet side effect is avoiding calls to ugly page_address( ) from the
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| 24 | * pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate)
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| 25 | *
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| 26 | * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
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| 27 |
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| 28 |
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| 29 | #ifndef _ASM_ARC_PGALLOC_H
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| 30 | #define _ASM_ARC_PGALLOC_H
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| 31 |
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| 32 | #include <linux/mm.h>
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| 33 | #include <linux/log2.h>
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| 34 | #include <asm-generic/pgalloc.h>
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| 35 |
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| 36 | static inline void
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| 37 | pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
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| 38 | {
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| 39 | |
| 40 | * The cast to long below is OK in 32-bit PAE40 regime with long long pte
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| 41 | * Despite "wider" pte, the pte table needs to be in non-PAE low memory
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| 42 | * as all higher levels can only hold long pointers.
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| 43 | *
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| 44 | * The cast itself is needed given simplistic definition of set_pmd()
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| 45 |
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| 46 | set_pmd(pmd, __pmd((unsigned long)pte));
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| 47 | }
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| 48 |
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| 49 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page)
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| 50 | {
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| 51 | set_pmd(pmd, __pmd((unsigned long)page_address(pte_page)));
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| 52 | }
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| 53 |
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| 54 | static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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| 55 | {
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| 56 | pgd_t *ret = __pgd_alloc(mm, 0);
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| 57 |
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| 58 | if (ret) {
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| 59 | int num, num2;
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| 60 |
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| 61 | num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
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| 62 | num2 = VMALLOC_SIZE / PGDIR_SIZE;
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| 63 | memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
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| 64 | }
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| 65 | return ret;
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| 66 | }
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| 67 |
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| 68 | #if CONFIG_PGTABLE_LEVELS > 3
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| 69 |
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| 70 | static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
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| 71 | {
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| 72 | set_p4d(p4dp, __p4d((unsigned long)pudp));
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| 73 | }
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| 74 |
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| 75 | #define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd)
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| 76 |
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| 77 | #endif
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| 78 |
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| 79 | #if CONFIG_PGTABLE_LEVELS > 2
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| 80 |
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| 81 | static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
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| 82 | {
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| 83 | set_pud(pudp, __pud((unsigned long)pmdp));
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| 84 | }
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| 85 |
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| 86 | #define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
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| 87 |
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| 88 | #endif
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| 89 |
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| 90 | #define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
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| 91 |
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| 92 | #endif
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