linux-kernel - RE: [microblaze-uclinux] [PATCH 09/56] microblaze

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Date:	Mon, 5 May 2008 10:37:33 -0700
From:	"Stephen Neuendorffer" <stephen.neuendorffer@...inx.com>
To:	<microblaze-uclinux@...e.uq.edu.au>, <linux-kernel@...r.kernel.org>
Cc:	<arnd@...db.de>, <linux-arch@...r.kernel.org>,
	"John Linn" <linnj@...inx.com>, <john.williams@...alogix.com>,
	<matthew@....cx>, <will.newton@...il.com>, <drepper@...hat.com>,
	<grant.likely@...retlab.ca>, "Michal Simek" <monstr@...str.eu>
Subject: RE: [microblaze-uclinux] [PATCH 09/56] microblaze_v2: cache support


The microblaze has a write through data cache, hence 'flush' is really a
misnomer here and interesting methods are 'invalidate'.  In addition,
most of these functions should be used directly by an implementation of
dma-coherent.c (which I can't find in your patches).  

I'll try to cook up a patch for you with this today.

Steve

> +#define flush_cache_all()			__flush_cache_all()
> +#define flush_cache_mm(mm)			do { } while (0)
> +#define flush_cache_range(vma, start, end)	__flush_cache_all()
> +#define flush_cache_page(vma, vmaddr, pfn)	do { } while (0)
> +
> +#define flush_dcache_range(start, end)
__flush_dcache_range(start, end)
> +#define flush_dcache_page(page)		do { } while (0)
> +#define flush_dcache_mmap_lock(mapping)		do { } while (0)
> +#define flush_dcache_mmap_unlock(mapping)	do { } while (0)
> +
> +#define flush_icache_range(start, len)
__flush_icache_range(start, len)
> +#define flush_icache_page(vma, pg)		do { } while (0)
> +#define flush_icache_user_range(start, len)	do { } while (0)
> +
> +#define flush_cache_vmap(start, end)		do { } while (0)
> +#define flush_cache_vunmap(start, end)		do { } while (0)
> +
> +struct page;
> +struct mm_struct;
> +struct vm_area_struct;
> +
> +/* see arch/microblaze/kernel/cache.c */
> +extern void __flush_icache_all(void);
> +extern void __flush_icache_range(unsigned long start, unsigned long
end);
> +extern void __flush_icache_page(struct vm_area_struct *vma, struct
page *page);
> +extern void __flush_icache_user_range(struct vm_area_struct *vma,
> +				struct page *page,
> +				unsigned long adr, int len);
> +extern void __flush_cache_sigtramp(unsigned long addr);
> +
> +extern void __flush_dcache_all(void);
> +extern void __flush_dcache_range(unsigned long start, unsigned long
end);
> +extern void __flush_dcache_page(struct vm_area_struct *vma, struct
page *page);
> +extern void __flush_dcache_user_range(struct vm_area_struct *vma,
> +				struct page *page,
> +				unsigned long adr, int len);
> +
> +extern inline void __flush_cache_all(void)
> +{
> +	__flush_icache_all();
> +	__flush_dcache_all();
> +}
> +
> +#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
> +do { memcpy(dst, src, len); \
> +	flush_icache_user_range(vma, page, vaddr, len); \
> +} while (0)
> +#define copy_from_user_page(vma, page, vaddr, dst, src, len) \
> +	memcpy(dst, src, len)
> +
> +#endif /* _ASM_MICROBLAZE_CACHEFLUSH_H */
> --
> 1.5.4.GIT
> 
> ___________________________
> microblaze-uclinux mailing list
> microblaze-uclinux@...e.uq.edu.au
> Project Home Page :
http://www.itee.uq.edu.au/~jwilliams/mblaze-uclinux
> Mailing List Archive :
http://www.itee.uq.edu.au/~listarch/microblaze-uclinux/
> 


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