On Mon, 2011-07-11 at 22:51 -0500, Kumar Gala wrote:

On Jul 11, 2011, at 12:52 AM, Michael Neuling wrote:

quoted

On POWER6 and POWER7 if the input operand to an instruction is a
denormalised single precision binary floating we can take a
denormalisation exception where it's expected that the hypervisor (HV=1)
will fix up the inputs before the instruction is run.

This adds code to handle this denormalisation exception for POWER6 and
POWER7.

It also add a CONFIG_PPC_DENORMALISATION option and sets it in
pseries/ppc64_defconfig. 

This is useful on bare metal systems only.  Based on patch from Milton
Miller.

Signed-off-by: Michael Neuling <redacted>

---
arch/powerpc/Kconfig                   |    7 +
arch/powerpc/configs/ppc64_defconfig   |    1 
arch/powerpc/configs/pseries_defconfig |    1 
arch/powerpc/include/asm/ppc-opcode.h  |    2 
arch/powerpc/include/asm/reg.h         |    1 
arch/powerpc/kernel/exceptions-64s.S   |  125 +++++++++++++++++++++++++++++++++
6 files changed, 137 insertions(+)

Is it possible to run POWER6/7 systems in baremetal if you are not IBM?

Just wondering if this is useful to anyone but IBM.

While I cannot obviously comment on unreleased systems, the fact that
we've been contributing all sort of patches to run P7 in "HV" mode and
KVM on them should be enough of a hint :-)

Cheers,
Ben.