On 02/07/2010 03:35 PM, Alexander Graf wrote:
It's technically implementation dependent but I don't know of an
implementation that doesn't sign extend.
Hrm, would
gpr = (s64)(s32)gpr;
work? :)
Yes. Integer promotion does guarantee sign extension.
Regards,
Anthony Liguori
Alex
--
To
Avi Kivity wrote:
> On 02/07/2010 05:49 PM, Alexander Graf wrote:
>> Am 07.02.2010 um 13:54 schrieb Avi Kivity :
>>
>>> On 02/04/2010 05:55 PM, Alexander Graf wrote:
In an effort to get KVM on PPC more useful for other userspace
users than
Qemu, I figured it'd be a nice idea to imple
Am 07.02.2010 um 17:27 schrieb Anthony Liguori :
On 02/07/2010 06:32 AM, Avi Kivity wrote:
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The guest I was trying to get to run uses the LHA and LHAU
instructions.
Those instructions basically do a load, but also sign extend the
result.
Since
On 02/07/2010 06:32 AM, Avi Kivity wrote:
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The guest I was trying to get to run uses the LHA and LHAU instructions.
Those instructions basically do a load, but also sign extend the result.
Since we need to fill our registers by hand when doing MMIO,
On 02/07/2010 05:49 PM, Alexander Graf wrote:
Am 07.02.2010 um 13:54 schrieb Avi Kivity :
On 02/04/2010 05:55 PM, Alexander Graf wrote:
In an effort to get KVM on PPC more useful for other userspace users
than
Qemu, I figured it'd be a nice idea to implement virtualization of the
Gekko CPU.
On 02/07/2010 05:57 PM, Alexander Graf wrote:+
+dprintk(KERN_INFO "FPU Emulator 0x%x ( 0x%llx, 0x%llx, 0x%llx
)", inst,
+inout[1], inout[2], inout[3]);
+
+call_stack =&kvmppc_call_stack[(smp_processor_id() * 2)];
+call_stack[0] = inst;
+/* call_stack[1] is INS_BLR
On 02/07/2010 05:51 PM, Alexander Graf wrote:
+if (vcpu->arch.mmio_sign_extend) {
+switch (run->mmio.len) {
+#ifdef CONFIG_PPC64
+case 4:
+if (gpr& 0x8000)
+gpr |= 0xULL;
+break;
Wouldn't
gpr = (s64)(gpr << 32)
Am 07.02.2010 um 13:50 schrieb Avi Kivity :
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The one big thing about the Gekko is paired singles.
Paired singles are an extension to the instruction set, that adds
32 single
precision floating point registers (qprs), some SPRs to modify the
beh
Am 07.02.2010 um 13:29 schrieb Avi Kivity :
On 02/04/2010 05:55 PM, Alexander Graf wrote:
Right now MMIO access can only happen for GPRs and is at most 32
bit wide.
That's actually enough for almost all types of hardware out there.
Unfortunately, the guest I was using used FPU writes to MMI
Am 07.02.2010 um 13:32 schrieb Avi Kivity :
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The guest I was trying to get to run uses the LHA and LHAU
instructions.
Those instructions basically do a load, but also sign extend the
result.
Since we need to fill our registers by hand when doin
Am 07.02.2010 um 13:54 schrieb Avi Kivity :
On 02/04/2010 05:55 PM, Alexander Graf wrote:
In an effort to get KVM on PPC more useful for other userspace
users than
Qemu, I figured it'd be a nice idea to implement virtualization of
the
Gekko CPU.
The Gekko is the CPU used in the GameCube. I
On 02/04/2010 05:55 PM, Alexander Graf wrote:
In an effort to get KVM on PPC more useful for other userspace users than
Qemu, I figured it'd be a nice idea to implement virtualization of the
Gekko CPU.
The Gekko is the CPU used in the GameCube. In a slightly more modern
fashion it lives on in th
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The one big thing about the Gekko is paired singles.
Paired singles are an extension to the instruction set, that adds 32 single
precision floating point registers (qprs), some SPRs to modify the behavior
of paired singled operations and instructions
On 02/04/2010 05:55 PM, Alexander Graf wrote:
The guest I was trying to get to run uses the LHA and LHAU instructions.
Those instructions basically do a load, but also sign extend the result.
Since we need to fill our registers by hand when doing MMIO, we also need
to sign extend manually.
This
On 02/04/2010 05:55 PM, Alexander Graf wrote:
Right now MMIO access can only happen for GPRs and is at most 32 bit wide.
That's actually enough for almost all types of hardware out there.
Unfortunately, the guest I was using used FPU writes to MMIO regions, so
it ended up writing 64 bit MMIOs us
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