diff options
| author | Helge Deller <deller@gmx.de> | 2017-09-17 21:28:11 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2017-09-22 19:46:52 +0200 |
| commit | 8d771b143fe2e3941fc8a32926d21410004578c0 (patch) | |
| tree | fbfa49f7e533a67f5edc040d7f93470e62e295d7 | |
| parent | 77089c5274fe2f72db5a2cd956d0d308aed08e68 (diff) | |
| download | linux-8d771b143fe2e3941fc8a32926d21410004578c0.tar.gz linux-8d771b143fe2e3941fc8a32926d21410004578c0.tar.bz2 linux-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>
| -rw-r--r-- | arch/parisc/kernel/traps.c | 10 |
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; |