PPC: Cuda: Use cuda timer to expose tbfreq to guest

Mac OS X calibrates a number of frequencies on bootup based on reading
tb values on bootup and comparing them to via cuda timer values.

The only variable we can really steer well (thanks to KVM) is the cuda
frequency. So let's use that one to fake Mac OS X into believing the
bus frequency is tbfreq * 4. That way Mac OS X will automatically
calculate the correct timebase frequency.

With this patch and the patch set I posted earlier I can successfully
run Mac OS X 10.2, 10.3 and 10.4 guests with -M mac99 on TCG and KVM.

Suggested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/hw/ppc/mac.h b/hw/ppc/mac.h
index 23536f4..aff2b9a 100644
--- a/hw/ppc/mac.h
+++ b/hw/ppc/mac.h
@@ -57,6 +57,7 @@ typedef struct CUDATimer {
     uint16_t counter_value;
     int64_t load_time;
     int64_t next_irq_time;
+    uint64_t frequency;
     QEMUTimer *timer;
 } CUDATimer;
 
@@ -97,6 +98,7 @@ typedef struct CUDAState {
     CUDATimer timers[2];
 
     uint32_t tick_offset;
+    uint64_t frequency;
 
     uint8_t last_b;
     uint8_t last_acr;