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37fb60f8e3
kernel_optimize_test/arch/mips/kernel
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James Hogan 37fb60f8e3 MIPS: Add defs & probing of extended CP0_EBase 
The CP0_EBase register may optionally have a write gate (WG) bit to
allow the upper bits to be written, i.e. bits 31:30 on MIPS32 since r3
(to allow for an exception base outside of KSeg0/KSeg1 when segmentation
control is in use) and bits 63:30 on MIPS64 (which also implies the
extension of CP0_EBase to 64 bits long).

The presence of this feature will need to be known about for VZ support
in order to correctly save and restore all the bits of the guest
CP0_EBase register, so add CPU feature definition and probing for this
feature.

Probing the WG bit on MIPS64 can be a bit fiddly, since 64-bit COP0
register access instructions were UNDEFINED for 32-bit registers prior
to MIPS r6, and it'd be nice to be able to probe without clobbering the
existing state, so there are 3 potential paths:

- If we do a 32-bit read of CP0_EBase and the WG bit is already set, the
  register must be 64-bit.

- On MIPS r6 we can do a 64-bit read-modify-write to set CP0_EBase.WG,
  since the upper bits will read 0 and be ignored on write if the
  register is 32-bit.

- On pre-r6 cores, we do a 32-bit read-modify-write of CP0_EBase. This
  avoids the potentially UNDEFINED behaviour, but will clobber the upper
  32-bits of CP0_EBase if it isn't a simple sign extension (which also
  requires us to ensure BEV=1 or modifying the exception base would be
  UNDEFINED too). It is hopefully unlikely a bootloader would set up
  CP0_EBase to a 64-bit segment and leave WG=0.

[ralf@linux-mips.org: Resolved merge conflict.]

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Tested-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/13223/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
2016-05-13 15:30:25 +02:00
..
.gitignore
8250-platform.c
asm-offsets.c MIPS: Support extended ASIDs 2016-05-13 14:02:20 +02:00
binfmt_elfn32.c mips: Differentiate between 32 and 64 bit ELF header 2016-02-11 11:38:22 +01:00
binfmt_elfo32.c mips: Differentiate between 32 and 64 bit ELF header 2016-02-11 11:38:22 +01:00
bmips_5xxx_init.S MIPS: BMIPS: Make whitespacely correct. 2016-05-09 12:00:01 +02:00
bmips_vec.S MIPS: BMIPS: Add Whirlwind (BMIPS5200) initialization code 2016-05-09 12:00:01 +02:00
branch.c MIPS: Fix BC1{EQ,NE}Z return offset calculation 2016-05-13 14:02:21 +02:00
cevt-bcm1480.c MIPS: cevt-bcm1480: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-ds1287.c MIPS: cevt-ds1287: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-gt641xx.c MIPS: cevt-gt641xx: Migrate to new 'set-state' interface 2015-09-03 12:07:51 +02:00
cevt-r4k.c MIPS: cevt-r4k: Migrate to new 'set-state' interface 2015-09-03 12:07:52 +02:00
cevt-sb1250.c MIPS: cevt-sb1250: Migrate to new 'set-state' interface 2015-09-03 12:07:52 +02:00
cevt-txx9.c MIPS: cevt-txx9: Migrate to new 'set-state' interface 2015-09-03 12:07:53 +02:00
cps-vec-ns16550.S MIPS: CPS: Early debug using an ns16550-compatible UART 2015-11-11 08:34:25 +01:00
cps-vec.S MIPS: smp-cps: Stop printing EJTAG exceptions to UART 2016-05-13 14:01:51 +02:00
cpu-bugs64.c MIPS: Use EXCCODE_ constants with set_except_vector() 2016-01-24 03:28:21 +01:00
cpu-probe.c MIPS: Add defs & probing of extended CP0_EBase 2016-05-13 15:30:25 +02:00
crash_dump.c
crash.c MIPS: Fix crash registers on non-crashing CPUs 2016-05-09 12:00:00 +02:00
csrc-bcm1480.c
csrc-ioasic.c
csrc-r4k.c MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime() 2015-11-11 08:36:41 +01:00
csrc-sb1250.c
early_printk_8250.c
early_printk.c
elf.c MIPS: Add IEEE Std 754 conformance mode selection 2016-01-20 00:39:20 +01:00
entry.S
ftrace.c
genex.S MIPS: genex: Indent delay slots & clean whitespace 2016-05-13 14:02:20 +02:00
gpio_txx9.c MIPS: txx9: switch to gpiochip_add_data() 2016-02-19 09:51:44 +01:00
head.S MIPS: Remove redundant asm/pgtable-bits.h inclusions 2016-05-13 15:30:25 +02:00
i8253.c
idle.c MIPS: Loongson: Add Loongson-3A R2 basic support 2016-05-13 14:02:14 +02:00
irq_txx9.c
irq-gt641xx.c
irq-msc01.c
irq-rm7000.c
irq.c MIPS: IRQ/IP27: Move IRQ allocation API to platform code. 2015-06-21 21:54:31 +02:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c MIPS: Get rid of 'kgdb_early_setup' cruft. 2015-06-21 21:54:10 +02:00
kprobes.c
linux32.c
machine_kexec.c
Makefile MIPS: Kernel: Add relocate.c 2016-05-13 14:02:02 +02:00
mcount.S
mips_ksyms.c MIPS: uaccess: Take EVA into account in [__]clear_user 2015-12-22 11:58:43 +01:00
mips_machine.c
mips-cm.c MIPS: Fix misspellings in comments. 2016-04-03 12:32:09 +02:00
mips-cpc.c MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core 2015-11-11 08:35:18 +01:00
mips-mt-fpaff.c MIPS: Fix sched_getaffinity with MT FPAFF enabled 2015-08-03 09:25:02 +02:00
mips-mt.c
mips-r2-to-r6-emul.c MIPS64: R6: R2 emulation bugfix 2016-05-09 12:00:04 +02:00
module-rela.c MIPS: module: fix incorrect IS_ERR_VALUE macro usages 2016-05-13 14:02:11 +02:00
module.c MIPS: module: fix incorrect IS_ERR_VALUE macro usages 2016-05-13 14:02:11 +02:00
octeon_switch.S MIPS: Fix octeon FP context switch handling 2015-10-02 19:16:06 +02:00
perf_event_mipsxx.c MIPS: Add P6600 cases to CPU switch statements 2016-05-13 14:01:52 +02:00
perf_event.c
pm-cps.c MIPS: pm-cps: Avoid offset overflow on MIPSr6 2016-05-13 14:01:48 +02:00
pm.c MIPS: Fix watchpoint restoration 2016-05-09 12:00:02 +02:00
proc.c MIPS: Detect DSP v3 support 2016-05-13 14:01:57 +02:00
process.c MIPS: Make flush_thread 2016-05-13 14:01:54 +02:00
prom.c MIPS: Fix build with CONFIG_OF=y for non OF-enabled targets 2015-08-03 09:25:00 +02:00
ptrace32.c
ptrace.c MIPS: Add and use watch register field definitions 2016-05-13 14:02:13 +02:00
r4k_fpu.S MIPS: Use copy_s.fmt rather than copy_u.fmt 2016-05-09 12:00:04 +02:00
r4k_switch.S MIPS: Remove redundant asm/pgtable-bits.h inclusions 2016-05-13 15:30:25 +02:00
r2300_fpu.S MIPS: Avoid variant of .type unsupported by LLVM Assembler 2016-02-29 11:23:49 +01:00
r2300_switch.S MIPS: Fix R2300 FP context switch handling 2015-10-02 19:16:46 +02:00
r6000_fpu.S
relocate_kernel.S MIPS: Replace add and sub instructions in relocate_kernel.S with addiu 2015-08-03 15:26:30 +02:00
relocate.c MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE 2016-05-13 14:02:03 +02:00
reset.c
rtlx-cmp.c
rtlx-mt.c
rtlx.c
scall32-o32.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
scall64-64.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
scall64-n32.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
scall64-o32.S MIPS: scall: Handle seccomp filters which redirect syscalls 2016-05-13 14:02:00 +02:00
segment.c MIPS: Declare mips_debugfs_dir in a header 2015-10-26 09:49:42 +01:00
setup.c MIPS: Octeon: detect and fix byte swapped initramfs 2016-05-13 15:30:25 +02:00
signal32.c MIPS: Support sending SIG_SYS to 32bit userspace from 64bit kernel 2016-05-13 14:02:00 +02:00
signal_n32.c MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
signal-common.h MIPS: Save MSA extended context around signals 2015-09-03 12:07:59 +02:00
signal.c MIPS64: signal: Fix o32 sigaction syscall 2016-05-13 14:02:16 +02:00
smp-bmips.c MIPS: BMIPS: Add early CPU initialization code 2016-05-13 14:01:55 +02:00
smp-cmp.c MIPS: Make smp CMP, CPS and MT use the new generic IPI functions 2016-02-25 10:56:58 +01:00
smp-cps.c MIPS: smp-cps: Add nothreads kernel parameter 2016-05-13 14:01:50 +02:00
smp-gic.c MIPS: CM: make use of mips_cm_{lock,unlock}_other 2015-11-11 08:35:17 +01:00
smp-mt.c MIPS: Make smp CMP, CPS and MT use the new generic IPI functions 2016-02-25 10:56:58 +01:00
smp-up.c
smp.c MIPS: Don't BUG_ON when no IPI domain is found 2016-05-09 12:00:00 +02:00
spinlock_test.c MIPS: Declare mips_debugfs_dir in a header 2015-10-26 09:49:42 +01:00
spram.c MIPS: Add P6600 cases to CPU switch statements 2016-05-13 14:01:52 +02:00
stacktrace.c MIPS: Add LATENCYTOP support 2015-11-11 08:36:46 +01:00
sync-r4k.c MIPS: sync-r4k: reduce skew while synchronization 2016-01-24 01:31:51 +01:00
syscall.c
sysrq.c MIPS: Refactor dumping of TLB registers for r3k/r4k 2015-09-03 12:07:45 +02:00
time.c
topology.c
traps.c MIPS: Retrieve ASID masks using function accepting struct cpuinfo_mips 2016-05-13 14:02:20 +02:00
unaligned.c MIPS: Fix MSA ld unaligned failure cases 2016-03-29 14:18:18 +02:00
uprobes.c MIPS: Add uprobes support. 2015-09-03 12:08:05 +02:00
vdso.c MIPS: VDSO: Add implementations of gettimeofday() and clock_gettime() 2015-11-11 08:36:41 +01:00
vmlinux.lds.S MIPS: Reserve space for relocation table 2016-05-13 14:02:02 +02:00
vpe-cmp.c
vpe-mt.c
vpe.c module: use a structure to encapsulate layout. 2015-12-04 22:46:25 +01:00
watch.c MIPS: Add and use watch register field definitions 2016-05-13 14:02:13 +02:00