I seem to recall the aliasing boundary value returned by my rp3440 is
"unknown".
On 10/29/2013 5:05 PM, Helge Deller wrote:
Our value of SHMLBA is hardcoded to 4MB on parisc due to aliasing restrictions
of the platform. The firmware function PDC_CACHE does return the machine
dependend value of this aliasing requirement.
So, if there is a difference between those two - which we don't expect - let's
report it at least.
Signed-off-by: Helge Deller <deller@xxxxxx>
diff --git a/arch/parisc/kernel/cache.c b/arch/parisc/kernel/cache.c
index c035673..3523e20 100644
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -142,6 +142,15 @@ parisc_cache_init(void)
if (pdc_cache_info(&cache_info) < 0)
panic("parisc_cache_init: pdc_cache_info failed");
+ /*
+ * The alias field returned by PDC_CACHE specifies the aliasing
+ * boundaries for virtual addresses. So, let's verify if our hardcoded
+ * value of SHMLBA (4 MB) is correct for this machine.
+ */
+ if ((4096UL << (cache_info.dc_conf.cc_alias-1)) != SHMLBA)
+ pr_warn("WARNING: PDC_CACHE returns aliasing of %lu kB.\n",
+ (4UL << (cache_info.dc_conf.cc_alias-1)));
+
#if 0
printk("ic_size %lx dc_size %lx it_size %lx\n",
cache_info.ic_size,
--
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--
John David Anglin dave.anglin@xxxxxxxx
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