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parisc: Add PDCE_CHECK instruction to HPMC handler

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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>
This commit is contained in:
Helge Deller 2017-09-17 21:28:11 +02:00
parent 77089c5274
commit 8d771b143f
1 changed files with 9 additions and 1 deletions
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10
arch/parisc/kernel/traps.c
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@ -817,7 +817,7 @@ void __init initialize_ivt(const void *iva)
u32 check = 0; u32 check = 0;
u32 *ivap; u32 *ivap;
u32 *hpmcp; u32 *hpmcp;
u32 length; u32 length, instr;
if (strcmp((const char *)iva, "cows can fly")) if (strcmp((const char *)iva, "cows can fly"))
panic("IVT invalid"); panic("IVT invalid");
@ -827,6 +827,14 @@ void __init initialize_ivt(const void *iva)
for (i = 0; i < 8; i++) for (i = 0; i < 8; i++)
*ivap++ = 0; *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 */ /* Compute Checksum for HPMC handler */
length = os_hpmc_size; length = os_hpmc_size;
ivap[7] = length; ivap[7] = length;