120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
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/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_PGALLOC_H
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#define _ASM_TILE_PGALLOC_H
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#include <linux/threads.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <asm/fixmap.h>
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#include <hv/hypervisor.h>
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/* Bits for the size of the second-level page table. */
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#define L2_KERNEL_PGTABLE_SHIFT \
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(HV_LOG2_PAGE_SIZE_LARGE - HV_LOG2_PAGE_SIZE_SMALL + HV_LOG2_PTE_SIZE)
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/* We currently allocate user L2 page tables by page (unlike kernel L2s). */
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#if L2_KERNEL_PGTABLE_SHIFT < HV_LOG2_PAGE_SIZE_SMALL
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#define L2_USER_PGTABLE_SHIFT HV_LOG2_PAGE_SIZE_SMALL
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#else
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#define L2_USER_PGTABLE_SHIFT L2_KERNEL_PGTABLE_SHIFT
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#endif
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/* How many pages do we need, as an "order", for a user L2 page table? */
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#define L2_USER_PGTABLE_ORDER (L2_USER_PGTABLE_SHIFT - HV_LOG2_PAGE_SIZE_SMALL)
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/* How big is a kernel L2 page table? */
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#define L2_KERNEL_PGTABLE_SIZE (1 << L2_KERNEL_PGTABLE_SHIFT)
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static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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#ifdef CONFIG_64BIT
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set_pte_order(pmdp, pmd, L2_USER_PGTABLE_ORDER);
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#else
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set_pte_order(&pmdp->pud.pgd, pmd.pud.pgd, L2_USER_PGTABLE_ORDER);
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#endif
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}
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static inline void pmd_populate_kernel(struct mm_struct *mm,
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pmd_t *pmd, pte_t *ptep)
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{
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set_pmd(pmd, ptfn_pmd(__pa(ptep) >> HV_LOG2_PAGE_TABLE_ALIGN,
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__pgprot(_PAGE_PRESENT)));
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}
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static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
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pgtable_t page)
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{
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set_pmd(pmd, ptfn_pmd(HV_PFN_TO_PTFN(page_to_pfn(page)),
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__pgprot(_PAGE_PRESENT)));
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}
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/*
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* Allocate and free page tables.
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*/
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extern pgd_t *pgd_alloc(struct mm_struct *mm);
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extern void pgd_free(struct mm_struct *mm, pgd_t *pgd);
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extern pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address);
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extern void pte_free(struct mm_struct *mm, struct page *pte);
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#define pmd_pgtable(pmd) pmd_page(pmd)
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static inline pte_t *
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pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
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{
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return pfn_to_kaddr(page_to_pfn(pte_alloc_one(mm, address)));
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}
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static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
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{
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BUG_ON((unsigned long)pte & (PAGE_SIZE-1));
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pte_free(mm, virt_to_page(pte));
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}
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extern void __pte_free_tlb(struct mmu_gather *tlb, struct page *pte,
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unsigned long address);
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#define check_pgt_cache() do { } while (0)
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/*
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* Get the small-page pte_t lowmem entry for a given pfn.
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* This may or may not be in use, depending on whether the initial
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* huge-page entry for the page has already been shattered.
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*/
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pte_t *get_prealloc_pte(unsigned long pfn);
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/* During init, we can shatter kernel huge pages if needed. */
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void shatter_pmd(pmd_t *pmd);
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#ifdef __tilegx__
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/* We share a single page allocator for both L1 and L2 page tables. */
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#if HV_L1_SIZE != HV_L2_SIZE
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# error Rework assumption that L1 and L2 page tables are same size.
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#endif
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#define L1_USER_PGTABLE_ORDER L2_USER_PGTABLE_ORDER
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#define pud_populate(mm, pud, pmd) \
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pmd_populate_kernel((mm), (pmd_t *)(pud), (pte_t *)(pmd))
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#define pmd_alloc_one(mm, addr) \
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((pmd_t *)page_to_virt(pte_alloc_one((mm), (addr))))
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#define pmd_free(mm, pmdp) \
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pte_free((mm), virt_to_page(pmdp))
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#define __pmd_free_tlb(tlb, pmdp, address) \
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__pte_free_tlb((tlb), virt_to_page(pmdp), (address))
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#endif
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#endif /* _ASM_TILE_PGALLOC_H */
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