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1707dd1613
linux/arch/powerpc/kernel
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Paul Mackerras 1707dd1613 powerpc: Save CFAR before branching in interrupt entry paths 
Some of the interrupt vectors on 64-bit POWER server processors are
only 32 bytes long, which is not enough for the full first-level
interrupt handler.  For these we currently just have a branch to an
out-of-line handler.  However, this means that we corrupt the CFAR
(come-from address register) on POWER7 and later processors.

To fix this, we split the EXCEPTION_PROLOG_1 macro into two pieces:
EXCEPTION_PROLOG_0 contains the part up to the point where the CFAR
is saved in the PACA, and EXCEPTION_PROLOG_1 contains the rest.  We
then put EXCEPTION_PROLOG_0 in the short interrupt vectors before
we branch to the out-of-line handler, which contains the rest of the
first-level interrupt handler.  To facilitate this, we define new
_OOL (out of line) variants of STD_EXCEPTION_PSERIES, etc.

In order to get EXCEPTION_PROLOG_0 to be short enough, i.e., no more
than 6 instructions, it was necessary to move the stores that move
the PPR and CFAR values into the PACA into __EXCEPTION_PROLOG_1 and
to get rid of one of the two HMT_MEDIUM instructions.  Previously
there was a HMT_MEDIUM_PPR_DISCARD before the prolog, which was
nop'd out on processors with the PPR (POWER7 and later), and then
another HMT_MEDIUM inside the HMT_MEDIUM_PPR_SAVE macro call inside
__EXCEPTION_PROLOG_1, which was nop'd out on processors without PPR.
Now the HMT_MEDIUM inside EXCEPTION_PROLOG_0 is there unconditionally
and the HMT_MEDIUM_PPR_DISCARD is not strictly necessary, although
this leaves it in for the interrupt vectors where there is room for
it.

Previously we had a handler for hypervisor maintenance interrupts at
0xe50, which doesn't leave enough room for the vector for hypervisor
emulation assist interrupts at 0xe40, since we need 8 instructions.
The 0xe50 vector was only used on POWER6, as the HMI vector was moved
to 0xe60 on POWER7.  Since we don't support running in hypervisor mode
on POWER6, we just remove the handler at 0xe50.

This also changes denorm_exception_hv to use EXCEPTION_PROLOG_0
instead of open-coding it, and removes the HMT_MEDIUM_PPR_DISCARD
from the relocation-on vectors (since any CPU that supports
relocation-on interrupts also has the PPR).

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2013-02-15 16:54:30 +11:00
..
vdso32 powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
vdso64 powerpc: Add VDSO version of getcpu 2012-07-11 14:18:40 +10:00
.gitignore
align.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
asm-offsets.c powerpc: Add support for context switching the TAR register 2013-02-08 14:05:50 +11:00
audit.c
btext.c
cacheinfo.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
cacheinfo.h
clock.c
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S
cpu_setup_a2.S powerpc: Enforce usage of RA 0-R31 where possible 2012-07-10 19:18:35 +10:00
cpu_setup_fsl_booke.S powerpc/booke: Add CPU_FTR_EMB_HV check for e5500. 2012-09-12 14:57:09 -05:00
cpu_setup_pa6t.S
cpu_setup_power.S powerpc: Add support for context switching the TAR register 2013-02-08 14:05:50 +11:00
cpu_setup_ppc970.S
cputable.c powerpc: Add POWER8 architected mode to cputable 2012-11-15 15:02:00 +11:00
crash_dump.c powerpc: Rename mapping based RELOCATABLE to DYNAMIC_MEMSTART for BookE 2011-12-20 10:20:19 -05:00
crash.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
dbell.c powerpc: Define differences between doorbells on book3e and book3s 2013-01-10 15:09:05 +11:00
dma-iommu.c powerpc/dma-iommu: Fix IOMMU window check 2012-08-24 20:26:07 +10:00
dma-swiotlb.c powerpc/swiotlb: Enable at early stage and disable if not necessary 2012-09-12 14:57:09 -05:00
dma.c powerpc/kernel: Remove uses of abs_to_virt() and virt_to_abs() 2012-09-05 15:19:30 +10:00
entry_32.S powerpc: Fix MAX_STACK_TRACE_ENTRIES too low warning for ppc32 2013-01-29 10:10:22 +11:00
entry_64.S powerpc: Add support for context switching the TAR register 2013-02-08 14:05:50 +11:00
epapr_hcalls.S KVM: PPC: ev_idle hcall support for e500 guests 2012-10-05 23:38:37 +02:00
epapr_paravirt.c KVM: PPC: ev_idle hcall support for e500 guests 2012-10-05 23:38:37 +02:00
exceptions-64e.S powerpc: Move branch instruction from ACCOUNT_CPU_USER_ENTRY to caller 2013-01-10 17:00:59 +11:00
exceptions-64s.S powerpc: Save CFAR before branching in interrupt entry paths 2013-02-15 16:54:30 +11:00
fadump.c powerpc: Change memory_limit from phys_addr_t to unsigned long long 2012-09-07 11:44:30 +10:00
firmware.c
fpu.S powerpc: Enforce usage of R0-R31 where possible 2012-07-10 19:18:30 +10:00
fsl_booke_entry_mapping.S
ftrace.c powerpc/ftrace: Trace function graph entry before updating index 2012-07-27 11:42:34 +10:00
head_8xx.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_32.S powerpc: Call do_page_fault() with interrupts off 2012-03-09 10:55:08 +11:00
head_40x.S powerpc: Enable the Watchdog vector for 405 2013-01-10 14:43:46 +11:00
head_44x.S Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm 2012-05-24 16:17:30 -07:00
head_64.S powerpc/kexec: Add kexec "hold" support for Book3e processors 2013-01-10 17:00:39 +11:00
head_booke.h KVM: PPC: booke: category E.HV (GS-mode) support 2012-04-08 12:51:19 +03:00
head_fsl_booke.S powepc/booke: Separate out E.HV check and ivor setup code. 2012-09-12 14:57:08 -05:00
hw_breakpoint.c powerpc: Change hardware breakpoint to allow longer ranges 2013-01-29 11:35:08 +11:00
ibmebus.c powerpc: Remove all includes of <asm/abs_addr.h> 2012-09-05 15:19:33 +10:00
idle_6xx.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_book3e.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_e500.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power4.S powerpc: Use CURRENT_THREAD_INFO instead of open coded assembly 2012-07-11 14:18:22 +10:00
idle_power7.S powerpc/powernv: Always go into nap mode when CPU is offline 2012-09-05 16:05:20 +10:00
idle.c powerpc: Remove no longer used ppc_md.idle_loop() 2012-11-15 13:00:20 +11:00
io-workarounds.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
io.c
iomap.c powerpc: switch to GENERIC_PCI_IOMAP 2011-11-28 21:13:18 +02:00
iommu.c powerpc/iommu: Prevent false TCE leak message 2013-01-10 17:01:53 +11:00
irq.c powerpc: Add code to handle soft-disabled doorbells on server 2013-01-10 15:09:07 +11:00
isa-bridge.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
jump_label.c powerpc: Fix build breakage in jump_label.c 2011-11-16 14:25:19 +11:00
kgdb.c Merge branch 'merge' into next 2013-01-29 11:33:37 +11:00
kprobes.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
kvm_emul.S KVM: PPC: Not optimizing MSR_CE and MSR_ME with paravirt. 2012-05-30 11:43:11 +02:00
kvm.c KVM: PPC: use definitions in epapr header for hcalls 2012-10-05 23:38:36 +02:00
l2cr_6xx.S
legacy_serial.c Fix misspellings of "whether" in comments. 2012-11-19 14:31:35 +01:00
lparcfg.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
machine_kexec_32.c treewide: convert uses of ATTRIB_NORETURN to __noreturn 2012-01-12 20:13:03 -08:00
machine_kexec_64.c powerpc+of: Rename the drivers/of prom_* functions to of_* 2012-11-15 12:56:52 +11:00
machine_kexec.c powerpc+of: Rename the drivers/of prom_* functions to of_* 2012-11-15 12:56:52 +11:00
Makefile powerpc: Build kernel with -mcmodel=medium 2013-01-10 17:00:31 +11:00
misc_32.S powerpc: split ret_from_fork 2012-09-30 23:31:19 -04:00
misc_64.S powerpc: split ret_from_fork 2012-09-30 23:31:19 -04:00
misc.S powerpc: switch to generic sys_execve()/kernel_execve() 2012-09-30 23:35:51 -04:00
module_32.c powerpc: Fix kernel panic during kernel module load 2012-06-08 19:59:08 +10:00
module_64.c powerpc: Build kernel with -mcmodel=medium 2013-01-10 17:00:31 +11:00
module.c
msi.c
nvram_64.c
of_platform.c powerpc/eeh: Fix crash when adding a device in a slot with DDW 2013-01-10 17:01:58 +11:00
paca.c powerpc: Initialise paca.data_offset with poison 2012-09-10 09:35:27 +10:00
pci_32.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_64.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_dn.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci_of_scan.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
pci-common.c powerpc/eeh: Fix crash when adding a device in a slot with DDW 2013-01-10 17:01:58 +11:00
pmc.c bug.h: add include of it to various implicit C users 2012-02-29 17:15:08 -05:00
ppc32.h compat: move compat_siginfo_t definition to asm/compat.h 2012-10-06 03:05:16 +09:00
ppc_ksyms.c Merge remote-tracking branch 'master' into queue 2012-10-29 19:15:32 -02:00
ppc_save_regs.S
proc_powerpc.c
process.c powerpc: Add length setting to set_dawr 2013-01-29 11:35:07 +11:00
prom_init_check.sh powerpc: Relocate prom_init.c on 64bit 2013-01-10 17:00:25 +11:00
prom_init.c powerpc: Remove RELOC() macro 2013-01-10 17:00:28 +11:00
prom_parse.c
prom.c Merge branch 'dt' into next 2012-11-15 15:02:44 +11:00
ptrace32.c powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers 2013-01-10 17:01:44 +11:00
ptrace.c powerpc: Add DSCR support to ptrace 2013-01-16 05:25:46 +11:00
reloc_32.S powerpc: Process dynamic relocations for kernel 2011-12-20 10:21:08 -05:00
reloc_64.S
rtas_flash.c powerpc/rtas_flash: Eliminate possible double free 2012-11-15 13:00:11 +11:00
rtas_pci.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
rtas-proc.c
rtas-rtc.c
rtas.c powerpc+of: Remove the pSeries_reconfig.h file 2012-11-15 12:56:55 +11:00
rtasd.c powerpc/pseries: Cancel RTAS event scan before firmware flash 2011-11-25 14:11:29 +11:00
setup_32.c powerpc/watchdog: move booke watchdog param related code to setup-common.c 2012-07-11 07:44:03 -05:00
setup_64.c powerpc: Make load_hander handle upto 64k offset 2012-11-15 15:08:03 +11:00
setup-common.c powerpc/watchdog: move booke watchdog param related code to setup-common.c 2012-07-11 07:44:03 -05:00
setup.h
signal_32.c Uninclude linux/freezer.h 2012-10-01 09:58:18 -04:00
signal_64.c Fix misspellings of "whether" in comments. 2012-11-19 14:31:35 +01:00
signal.c powerpc: Rename set_break to avoid naming conflict 2013-01-16 05:25:47 +11:00
signal.h powerpc: get rid of restore_sigmask() 2012-06-01 12:58:51 -04:00
smp-tbsync.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
smp.c powerpc: fix ics_rtas_init and start_secondary section mismatch 2013-02-08 14:05:48 +11:00
softemu8xx.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
stacktrace.c
suspend.c
swsusp_32.S
swsusp_64.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
swsusp_asm64.S
swsusp_booke.S
swsusp.c Disintegrate asm/system.h for PowerPC 2012-03-28 18:30:02 +01:00
sys_ppc32.c compat: generic compat_sys_sched_rr_get_interval() implementation 2012-12-17 17:15:18 -08:00
syscalls.c powerpc: Fix personality handling in ppc64_personality() 2012-08-24 20:26:07 +10:00
sysfs.c numa: convert static memory to dynamically allocated memory for per node device 2012-12-11 17:22:23 -08:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c
time.c powerpc: Max next_tb to prevent from replaying timer interrupt 2013-01-29 10:18:16 +11:00
traps.c powerpc: Hardware breakpoints rewrite to handle non DABR breakpoint registers 2013-01-10 17:01:44 +11:00
udbg_16550.c
udbg.c powerpc/udbg: Remove unused udbg_read() 2012-11-15 12:59:33 +11:00
uprobes.c uprobes/powerpc: Do not use arch_uprobe_*_step() helpers 2012-11-03 17:15:12 +01:00
vdso.c powerpc: Restore VDSO information on critical exception om BookE 2012-09-07 09:48:49 +10:00
vecemu.c
vector.S powerpc: Optimise enable_kernel_altivec 2012-04-30 15:37:17 +10:00
vio.c POWERPC: drivers: remove __dev* attributes. 2013-01-03 15:57:04 -08:00
vmlinux.lds.S powerpc: Relocate prom_init.c on 64bit 2013-01-10 17:00:25 +11:00