diff options
| author |   Kyle McMartin <kyle@parisc-linux.org> | 2006-06-16 18:20:00 -0400 |
|---|---|---|
| committer |   Kyle McMartin <kyle@hera.kernel.org> | 2006-06-27 23:28:42 +0000 |
| commit | a9d2d386c42b816a81eb1d02dfb7b502ba8cea82 (patch) | |
| tree | 0c01caa8a470713dc8a68db0ed584cfe3142392d /arch | |
| parent | [PARISC] Match show_cache_info with reality (diff) | |
| download | linux-dev-a9d2d386c42b816a81eb1d02dfb7b502ba8cea82.tar.xz linux-dev-a9d2d386c42b816a81eb1d02dfb7b502ba8cea82.zip | |
[PARISC] Ensure Space ID hashing is turned off
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/parisc/kernel/cache.c | 10 | ||||
| -rw-r--r-- | arch/parisc/kernel/firmware.c | 20 |
2 files changed, 29 insertions, 1 deletions
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c index 851519cbad6f..bc7c4a4e26a1 100644 --- a/arch/parisc/kernel/cache.c +++ b/arch/parisc/kernel/cache.c @@ -236,7 +236,8 @@ parisc_cache_init(void) void disable_sr_hashing(void) { - int srhash_type; + int srhash_type, retval; + unsigned long space_bits; switch (boot_cpu_data.cpu_type) { case pcx: /* We shouldn't get this far. setup.c should prevent it. */ @@ -262,6 +263,13 @@ void disable_sr_hashing(void) } disable_sr_hashing_asm(srhash_type); + + retval = pdc_spaceid_bits(&space_bits); + /* If this procedure isn't implemented, don't panic. */ + if (retval < 0 && retval != PDC_BAD_OPTION) + panic("pdc_spaceid_bits call failed.\n"); + if (space_bits != 0) + panic("SpaceID hashing is still on!\n"); } void flush_dcache_page(struct page *page) diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c index 0596f27340cc..c80c277454f3 100644 --- a/arch/parisc/kernel/firmware.c +++ b/arch/parisc/kernel/firmware.c @@ -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. |