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authorHelge Deller <deller@gmx.de>2017-09-17 21:28:11 +0200
committerHelge Deller <deller@gmx.de>2017-09-22 19:46:52 +0200
commit8d771b143fe2e3941fc8a32926d21410004578c0 (patch)
treefbfa49f7e533a67f5edc040d7f93470e62e295d7 /arch/parisc/kernel/traps.c
parentparisc: Add wrapper for pdc_instr() firmware function (diff)
downloadlinux-dev-8d771b143fe2e3941fc8a32926d21410004578c0.tar.xz
linux-dev-8d771b143fe2e3941fc8a32926d21410004578c0.zip
parisc: Add PDCE_CHECK instruction to HPMC handler
According to the programming note at page 1-31 of the PA 1.1 Firmware Architecture document, one should use the PDC_INSTR firmware function to get the instruction that invokes a PDCE_CHECK in the HPMC handler. This patch follows this note and sets the instruction which has been a nop up until now. Testing on a C3000 and C8000 showed that this firmware call isn't implemented on those machines, so maybe it's only needed on older ones. Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to '')
-rw-r--r--arch/parisc/kernel/traps.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 991654c88eec..230333157fe3 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -817,7 +817,7 @@ void __init initialize_ivt(const void *iva)
u32 check = 0;
u32 *ivap;
u32 *hpmcp;
- u32 length;
+ u32 length, instr;
if (strcmp((const char *)iva, "cows can fly"))
panic("IVT invalid");
@@ -827,6 +827,14 @@ void __init initialize_ivt(const void *iva)
for (i = 0; i < 8; i++)
*ivap++ = 0;
+ /*
+ * Use PDC_INSTR firmware function to get instruction that invokes
+ * PDCE_CHECK in HPMC handler. See programming note at page 1-31 of
+ * the PA 1.1 Firmware Architecture document.
+ */
+ if (pdc_instr(&instr) == PDC_OK)
+ ivap[0] = instr;
+
/* Compute Checksum for HPMC handler */
length = os_hpmc_size;
ivap[7] = length;