diff options
| author | Alexander Graf <agraf@suse.de> | 2010-04-03 11:37:26 +0200 |
|---|---|---|
| committer | malc <av1474@comtv.ru> | 2010-04-03 14:26:45 +0400 |
| commit | 4a9590f32e5692114aaae4ca10da89dac633e164 (patch) | |
| tree | 91f5bab144307c88d59785ca41f1a55efadd3cd0 /hw/ppc_oldworld.c | |
| parent | 93c5a32f89c19a97badd0aa79d2ac2e44376b40e (diff) | |
Make cpu_get_real_ticks use mfspr
PowerPC CPUs have had two ways to read the time base for quite some time now.
They provide it using the mfspr instruction or - if a special bit is set in
that opcode - using mftb. For timekeeping we're currently using mftb.
While trying to get Qemu up and running on an e500v2 system, I stumbled over
the CPU not supporting mftbu. It just throws an illegal instruction trap.
So let's read the SPR values instead. All PPC CPUs should support them anyways.
I tested this patch on an e500v2 system where it makes qemu work and on my 970MP
system with 32-bit user space where everything still works with this patch
applied.
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: malc <av1474@comtv.ru>
Diffstat (limited to 'hw/ppc_oldworld.c')
0 files changed, 0 insertions, 0 deletions