When flush all dcache, why the increasing step is 2?

2012/10/12 Catalin Marinas [off-list ref]

On Fri, Oct 12, 2012 at 11:51:07AM +0100, Li Haifeng wrote:

quoted

For flush all data cache, the flush action begins from Level 0, then

increase

quoted

cache level by 1.

But in function v7_flush_dcache_all, the step is 2. IOW, it will just

flush

quoted

0,2,4,6 level cache.
As the following code, the step is stored in r10, and the increase line

is "add

quoted

    r10, r10, #2".

That's because the cache level is written in the CSSELR bits 3:1 (so no
bit 0). When the levels of cache is calculated (r3), it is also 2x.

Great, Thanks very much.

--
Catalin

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