From: Helge Deller Date: Sun, 17 Sep 2017 19:28:11 +0000 (+0200) Subject: parisc: Add PDCE_CHECK instruction to HPMC handler X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8d771b143fe2e3941fc8a32926d21410004578c0;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 --- 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;