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authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2012-10-05 08:07:15 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2013-01-10 14:43:46 +1100
commit1e18c17adf32b86474fd903071b0181de9334bd4 (patch)
treeceee7b61403c3e074ba08ad6c82a385062430e71 /arch/powerpc/kernel
parentfb9125680d0e7c23eae7c6000acc91ea26acab9c (diff)
downloadlinaro-lsk-1e18c17adf32b86474fd903071b0181de9334bd4.tar.gz
powerpc: Enable the Watchdog vector for 405
The watchdog and FIT code has been #if 0'd for ever, if the CPU takes an exception to either of those vectors it will jump into the middle of the PIT or Data TLB code and surely crash. At least some (all?) 405 cores have both the WDT and FIT vectors defined, so lets have proper entry points for them. Tested that the WDT vector works on a 405F6 core. Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/head_40x.S47
-rw-r--r--arch/powerpc/kernel/traps.c2
2 files changed, 30 insertions, 19 deletions
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 4989661b710..8a9b6f59822 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -430,30 +430,18 @@ label:
EXCEPTION(0x0F00, Trap_0F, unknown_exception, EXC_XFER_EE)
/* 0x1000 - Programmable Interval Timer (PIT) Exception */
- START_EXCEPTION(0x1000, Decrementer)
- NORMAL_EXCEPTION_PROLOG
- lis r0,TSR_PIS@h
- mtspr SPRN_TSR,r0 /* Clear the PIT exception */
- addi r3,r1,STACK_FRAME_OVERHEAD
- EXC_XFER_LITE(0x1000, timer_interrupt)
-
-#if 0
-/* NOTE:
- * FIT and WDT handlers are not implemented yet.
- */
+ . = 0x1000
+ b Decrementer
/* 0x1010 - Fixed Interval Timer (FIT) Exception
*/
- STND_EXCEPTION(0x1010, FITException, unknown_exception)
+ . = 0x1010
+ b FITException
/* 0x1020 - Watchdog Timer (WDT) Exception
*/
-#ifdef CONFIG_BOOKE_WDT
- CRITICAL_EXCEPTION(0x1020, WDTException, WatchdogException)
-#else
- CRITICAL_EXCEPTION(0x1020, WDTException, unknown_exception)
-#endif
-#endif
+ . = 0x1020
+ b WDTException
/* 0x1100 - Data TLB Miss Exception
* As the name implies, translation is not in the MMU, so search the
@@ -738,6 +726,29 @@ label:
(MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)), \
NOCOPY, crit_transfer_to_handler, ret_from_crit_exc)
+ /* Programmable Interval Timer (PIT) Exception. (from 0x1000) */
+Decrementer:
+ NORMAL_EXCEPTION_PROLOG
+ lis r0,TSR_PIS@h
+ mtspr SPRN_TSR,r0 /* Clear the PIT exception */
+ addi r3,r1,STACK_FRAME_OVERHEAD
+ EXC_XFER_LITE(0x1000, timer_interrupt)
+
+ /* Fixed Interval Timer (FIT) Exception. (from 0x1010) */
+FITException:
+ NORMAL_EXCEPTION_PROLOG
+ addi r3,r1,STACK_FRAME_OVERHEAD;
+ EXC_XFER_EE(0x1010, unknown_exception)
+
+ /* Watchdog Timer (WDT) Exception. (from 0x1020) */
+WDTException:
+ CRITICAL_EXCEPTION_PROLOG;
+ addi r3,r1,STACK_FRAME_OVERHEAD;
+ EXC_XFER_TEMPLATE(WatchdogException, 0x1020+2,
+ (MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE)),
+ NOCOPY, crit_transfer_to_handler,
+ ret_from_crit_exc)
+
/*
* The other Data TLB exceptions bail out to this point
* if they can't resolve the lightweight TLB fault.
diff --git a/arch/powerpc/kernel/traps.c b/arch/powerpc/kernel/traps.c
index 32518401af6..114ea241916 100644
--- a/arch/powerpc/kernel/traps.c
+++ b/arch/powerpc/kernel/traps.c
@@ -1515,7 +1515,7 @@ void unrecoverable_exception(struct pt_regs *regs)
die("Unrecoverable exception", regs, SIGABRT);
}
-#ifdef CONFIG_BOOKE_WDT
+#if defined(CONFIG_BOOKE_WDT) || defined(CONFIG_40x)
/*
* Default handler for a Watchdog exception,
* spins until a reboot occurs