| 1 |
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| 2 | |
| 3 | * OpenRISC Linux
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| 4 | *
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| 5 | * Linux architectural port borrowing liberally from similar works of
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| 6 | * others. All original copyrights apply as per the original source
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| 7 | * declaration.
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| 8 | *
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| 9 | * OpenRISC implementation:
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| 10 | * Copyright (C) 2003 Matjaz Breskvar <[email protected]>
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| 11 | * Copyright (C) 2010-2011 Jonas Bonn <[email protected]>
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| 12 | * et al.
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| 13 |
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| 14 |
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| 15 | #ifndef __ASM_OPENRISC_PGALLOC_H
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| 16 | #define __ASM_OPENRISC_PGALLOC_H
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| 17 |
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| 18 | #include <asm/page.h>
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| 19 | #include <linux/threads.h>
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| 20 | #include <linux/mm.h>
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| 21 | #include <linux/memblock.h>
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| 22 |
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| 23 | #define __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
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| 24 | #include <asm-generic/pgalloc.h>
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| 25 |
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| 26 | extern int mem_init_done;
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| 27 |
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| 28 | #define pmd_populate_kernel(mm, pmd, pte) \
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| 29 | set_pmd(pmd, __pmd(_KERNPG_TABLE + __pa(pte)))
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| 30 |
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| 31 | static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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| 32 | struct page *pte)
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| 33 | {
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| 34 | set_pmd(pmd, __pmd(_KERNPG_TABLE +
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| 35 | ((unsigned long)page_to_pfn(pte) <<
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| 36 | (unsigned long) PAGE_SHIFT)));
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| 37 | }
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| 38 |
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| 39 | |
| 40 | * Allocate and free page tables.
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| 41 |
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| 42 | static inline pgd_t *pgd_alloc(struct mm_struct *mm)
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| 43 | {
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| 44 | pgd_t *ret = __pgd_alloc(mm, 0);
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| 45 |
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| 46 | if (ret)
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| 47 | memcpy(ret + USER_PTRS_PER_PGD,
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| 48 | swapper_pg_dir + USER_PTRS_PER_PGD,
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| 49 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
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| 50 |
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| 51 | return ret;
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| 52 | }
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| 53 |
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| 54 | #if 0 |
| 55 | /* FIXME: This seems to be the preferred style, but we are using
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| 56 | * current_pgd (from mm->pgd) to load kernel pages so we need it
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| 57 | * initialized. This needs to be looked into.
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| 58 | */
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| 59 | extern inline pgd_t *pgd_alloc(struct mm_struct *mm)
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| 60 | {
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| 61 | return (pgd_t *)get_zeroed_page(GFP_KERNEL);
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| 62 | }
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| 63 | #endif
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| 64 |
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| 65 | extern pte_t *pte_alloc_one_kernel(struct mm_struct *mm);
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| 66 |
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| 67 | #define __pte_free_tlb(tlb, pte, addr) \
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| 68 | tlb_remove_ptdesc((tlb), page_ptdesc(pte))
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| 69 |
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| 70 | #endif
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