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[PARISC] Ensure Space ID hashing is turned off

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Check PDC_CACHE to see if spaceid hashing is turned on, and fail to
boot if that is the case.

However, some old machines do not implement the PDC_CACHE_RET_SPID
firmware call, so continue to boot if the call fails because of
PDC_BAD_OPTION (but fail in all other error returns).

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
This commit is contained in:
Kyle McMartin
2006-06-16 18:20:00 -04:00
committed by Kyle McMartin
parent e5a2e7fdb5
commit a9d2d386c4
3 changed files with 30 additions and 1 deletions
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20
arch/parisc/kernel/firmware.c
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@@ -512,6 +512,26 @@ int pdc_cache_info(struct pdc_cache_info *cache_info)
return retval;
}
/**
* pdc_spaceid_bits - Return whether Space ID hashing is turned on.
* @space_bits: Should be 0, if not, bad mojo!
*
* Returns information about Space ID hashing.
*/
int pdc_spaceid_bits(unsigned long *space_bits)
{
int retval;
spin_lock_irq(&pdc_lock);
pdc_result[0] = 0;
retval = mem_pdc_call(PDC_CACHE, PDC_CACHE_RET_SPID, __pa(pdc_result), 0);
convert_to_wide(pdc_result);
*space_bits = pdc_result[0];
spin_unlock_irq(&pdc_lock);
return retval;
}
#ifndef CONFIG_PA20
/**
* pdc_btlb_info - Return block TLB information.