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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-01-24 18:42:41 +1100 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2011-04-20 11:03:24 +1000 |
| commit | 948cf67c4726cca2fc57533dccadfb54d890689d (patch) | |
| tree | e763f1b49f66cf2c73b5a902063e2cb828e5d06c /arch/powerpc/kernel/exceptions-64s.S | |
| parent | 9d07bc841c9779b4d7902e417f4e509996ce805d (diff) | |
| download | blackbird-op-linux-948cf67c4726cca2fc57533dccadfb54d890689d.tar.gz blackbird-op-linux-948cf67c4726cca2fc57533dccadfb54d890689d.zip | |
powerpc: Add NAP mode support on Power7 in HV mode
Wakeup comes from the system reset handler with a potential loss of
the non-hypervisor CPU state. We save the non-volatile state on the
stack and a pointer to it in the PACA, which the system reset handler
uses to restore things
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/exceptions-64s.S')
| -rw-r--r-- | arch/powerpc/kernel/exceptions-64s.S | 30 |
1 files changed, 29 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S index e513c1d35b2a..ad06333631ac 100644 --- a/arch/powerpc/kernel/exceptions-64s.S +++ b/arch/powerpc/kernel/exceptions-64s.S @@ -37,7 +37,35 @@ .globl __start_interrupts __start_interrupts: - STD_EXCEPTION_PSERIES(0x100, 0x100, system_reset) + .globl system_reset_pSeries; +system_reset_pSeries: + HMT_MEDIUM; + DO_KVM 0x100; + SET_SCRATCH0(r13) +#ifdef CONFIG_PPC_P7_NAP +BEGIN_FTR_SECTION + /* Running native on arch 2.06 or later, check if we are + * waking up from nap. We only handle no state loss and + * supervisor state loss. We do -not- handle hypervisor + * state loss at this time. + */ + mfspr r13,SPRN_SRR1 + rlwinm r13,r13,47-31,30,31 + cmpwi cr0,r13,1 + bne 1f + b .power7_wakeup_noloss +1: cmpwi cr0,r13,2 + bne 1f + b .power7_wakeup_loss + /* Total loss of HV state is fatal, we could try to use the + * PIR to locate a PACA, then use an emergency stack etc... + * but for now, let's just stay stuck here + */ +1: cmpwi cr0,r13,3 + beq . +END_FTR_SECTION_IFSET(CPU_FTR_HVMODE_206) +#endif /* CONFIG_PPC_P7_NAP */ + EXCEPTION_PROLOG_PSERIES(PACA_EXGEN, system_reset_common, EXC_STD) . = 0x200 _machine_check_pSeries: |
