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sparc64: Probe cpu page size support more portably.

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On sun4v, interrogate the machine description.  This code is extremely
defensive in nature, and a lot of the checks can probably be removed.

On sun4u things are a lot simpler.  There are the page sizes all chips
support, and then Panther adds 32MB and 256MB pages.

Report the probed value in /proc/cpuinfo

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
2012-09-06 19:01:25 -07:00
parent 4f93d21d25
commit ce33fdc52a
3 changed files with 56 additions and 0 deletions
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arch/sparc/include/asm/mdesc.h
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@@ -73,6 +73,7 @@ extern void mdesc_register_notifier(struct mdesc_notifier_client *client);
extern void mdesc_fill_in_cpu_data(cpumask_t *mask);
extern void mdesc_populate_present_mask(cpumask_t *mask);
extern void mdesc_get_page_sizes(cpumask_t *mask, unsigned long *pgsz_mask);
extern void sun4v_mdesc_init(void);