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Commit 8d771b14 authored by Helge Deller's avatar Helge Deller
Browse files

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: default avatarHelge Deller <deller@gmx.de>
parent 77089c52

arch/parisc/kernel/traps.c

+9 −1
Original line number Diff line number Diff line
@@ -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;