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ec8c0446b6
Virtually index, physically tagged cache architectures can get away without cache flushing when forking. This patch adds a new cache flushing function flush_cache_dup_mm(struct mm_struct *) which for the moment I've implemented to do the same thing on all architectures except on MIPS where it's a no-op. Signed-off-by: Ralf Baechle <ralf@linux-mips.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* include/asm-xtensa/cacheflush.h
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* (C) 2001 - 2006 Tensilica Inc.
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*/
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#ifndef _XTENSA_CACHEFLUSH_H
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#define _XTENSA_CACHEFLUSH_H
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#ifdef __KERNEL__
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#include <linux/mm.h>
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#include <asm/processor.h>
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#include <asm/page.h>
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/*
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* flush and invalidate data cache, invalidate instruction cache:
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*
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* __flush_invalidate_cache_all()
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* __flush_invalidate_cache_range(from,sze)
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*
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* invalidate data or instruction cache:
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*
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* __invalidate_icache_all()
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* __invalidate_icache_page(adr)
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* __invalidate_dcache_page(adr)
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* __invalidate_icache_range(from,size)
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* __invalidate_dcache_range(from,size)
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*
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* flush data cache:
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*
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* __flush_dcache_page(adr)
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*
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* flush and invalidate data cache:
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*
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* __flush_invalidate_dcache_all()
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* __flush_invalidate_dcache_page(adr)
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* __flush_invalidate_dcache_range(from,size)
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*/
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extern void __flush_invalidate_cache_all(void);
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extern void __flush_invalidate_cache_range(unsigned long, unsigned long);
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extern void __flush_invalidate_dcache_all(void);
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extern void __invalidate_icache_all(void);
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extern void __invalidate_dcache_page(unsigned long);
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extern void __invalidate_icache_page(unsigned long);
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extern void __invalidate_icache_range(unsigned long, unsigned long);
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extern void __invalidate_dcache_range(unsigned long, unsigned long);
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#if XCHAL_DCACHE_IS_WRITEBACK
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extern void __flush_dcache_page(unsigned long);
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extern void __flush_invalidate_dcache_page(unsigned long);
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extern void __flush_invalidate_dcache_range(unsigned long, unsigned long);
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#else
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# define __flush_dcache_page(p) do { } while(0)
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# define __flush_invalidate_dcache_page(p) do { } while(0)
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# define __flush_invalidate_dcache_range(p,s) do { } while(0)
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#endif
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/*
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* We have physically tagged caches - nothing to do here -
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* unless we have cache aliasing.
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*
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* Pages can get remapped. Because this might change the 'color' of that page,
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* we have to flush the cache before the PTE is changed.
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* (see also Documentation/cachetlb.txt)
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*/
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#if (DCACHE_WAY_SIZE > PAGE_SIZE) && XCHAL_DCACHE_IS_WRITEBACK
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#define flush_cache_all() __flush_invalidate_cache_all();
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#define flush_cache_mm(mm) __flush_invalidate_cache_all();
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#define flush_cache_dup_mm(mm) __flush_invalidate_cache_all();
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#define flush_cache_vmap(start,end) __flush_invalidate_cache_all();
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#define flush_cache_vunmap(start,end) __flush_invalidate_cache_all();
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extern void flush_dcache_page(struct page*);
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extern void flush_cache_range(struct vm_area_struct*, ulong, ulong);
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extern void flush_cache_page(struct vm_area_struct*, unsigned long, unsigned long);
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#else
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#define flush_cache_all() do { } while (0)
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#define flush_cache_mm(mm) do { } while (0)
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#define flush_cache_dup_mm(mm) do { } while (0)
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#define flush_cache_vmap(start,end) do { } while (0)
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#define flush_cache_vunmap(start,end) do { } while (0)
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#define flush_dcache_page(page) do { } while (0)
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#define flush_cache_page(vma,addr,pfn) do { } while (0)
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#define flush_cache_range(vma,start,end) do { } while (0)
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#endif
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#define flush_icache_range(start,end) \
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__invalidate_icache_range(start,(end)-(start))
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/* This is not required, see Documentation/cachetlb.txt */
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#define flush_icache_page(vma,page) do { } while(0)
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#define flush_dcache_mmap_lock(mapping) do { } while (0)
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#define flush_dcache_mmap_unlock(mapping) do { } while (0)
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#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
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memcpy(dst, src, len)
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#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
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memcpy(dst, src, len)
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#endif /* __KERNEL__ */
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#endif /* _XTENSA_CACHEFLUSH_H */
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