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6656920b0b
Add support for processors that have cache-aliasing issues, such as the Stretch S5000 processor. Cache-aliasing means that the size of the cache (for one way) is larger than the page size, thus, a page can end up in several places in cache depending on the virtual to physical translation. The method used here is to map a user page temporarily through the auto-refill way 0 and of of the DTLB. We probably will want to revisit this issue and use a better approach with kmap/kunmap. Signed-off-by: Chris Zankel <chris@zankel.net>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* include/asm-xtensa/pgalloc.h
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Copyright (C) 2001-2007 Tensilica Inc.
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*/
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#ifndef _XTENSA_PGALLOC_H
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#define _XTENSA_PGALLOC_H
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#ifdef __KERNEL__
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#include <linux/highmem.h>
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/*
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* Allocating and freeing a pmd is trivial: the 1-entry pmd is
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* inside the pgd, so has no extra memory associated with it.
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*/
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#define pmd_populate_kernel(mm, pmdp, ptep) \
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(pmd_val(*(pmdp)) = ((unsigned long)ptep))
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#define pmd_populate(mm, pmdp, page) \
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(pmd_val(*(pmdp)) = ((unsigned long)page_to_virt(page)))
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static inline pgd_t*
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pgd_alloc(struct mm_struct *mm)
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{
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return (pgd_t*) __get_free_pages(GFP_KERNEL | __GFP_ZERO, PGD_ORDER);
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}
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static inline void pgd_free(pgd_t *pgd)
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{
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free_page((unsigned long)pgd);
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}
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/* Use a slab cache for the pte pages (see also sparc64 implementation) */
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extern struct kmem_cache *pgtable_cache;
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static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
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unsigned long address)
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{
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return kmem_cache_alloc(pgtable_cache, GFP_KERNEL|__GFP_REPEAT);
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}
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static inline struct page *pte_alloc_one(struct mm_struct *mm,
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unsigned long addr)
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{
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return virt_to_page(pte_alloc_one_kernel(mm, addr));
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}
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static inline void pte_free_kernel(pte_t *pte)
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{
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kmem_cache_free(pgtable_cache, pte);
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}
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static inline void pte_free(struct page *page)
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{
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kmem_cache_free(pgtable_cache, page_address(page));
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}
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_PGALLOC_H */
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