[Qemu-ppc] [PATCH 15/17] PPC: Add timer handler for newworld mac-io

[Alexander Graf]

Mac OS X accesses fancy timer registers inside of the mac-io on bootup.

These really should be ticking at the mac-io bus frequency, but I don't
see anyone upset when we just make them as fast as we want to.

With this patch on top of my previous patch queue and latest OpenBIOS
I am able to boot Mac OS X 10.4 with -M mac99.

Signed-off-by: Alexander Graf <address@hidden>
---
 hw/misc/macio/macio.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/hw/misc/macio/macio.c b/hw/misc/macio/macio.c
index 548fea6..4c872c9 100644
--- a/hw/misc/macio/macio.c
+++ b/hw/misc/macio/macio.c
@@ -234,11 +234,39 @@ static void macio_oldworld_init(Object *obj)
     }
 }
 
+static void timer_write(void *opaque, hwaddr addr, uint64_t value,
+                       unsigned size)
+{
+}
+
+static uint64_t timer_read(void *opaque, hwaddr addr, unsigned size)
+{
+    uint32_t value = 0;
+
+    switch (addr) {
+    case 0x38:
+        value = qemu_get_clock_ns(vm_clock);
+        break;
+    case 0x3c:
+        value = qemu_get_clock_ns(vm_clock) >> 32;
+        break;
+    }
+
+    return value;
+}
+
+static const MemoryRegionOps timer_ops = {
+    .read = timer_read,
+    .write = timer_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
 static int macio_newworld_initfn(PCIDevice *d)
 {
     MacIOState *s = MACIO(d);
     NewWorldMacIOState *ns = NEWWORLD_MACIO(d);
     SysBusDevice *sysbus_dev;
+    MemoryRegion *timer_memory = g_new(MemoryRegion, 1);
     int i;
     int cur_irq = 0;
     int ret = macio_common_initfn(d);
@@ -265,6 +293,10 @@ static int macio_newworld_initfn(PCIDevice *d)
         }
     }
 
+    /* Timer */
+    memory_region_init_io(timer_memory, &timer_ops, NULL, "timer", 0x1000);
+    memory_region_add_subregion(&s->bar, 0x15000, timer_memory);
+
     return 0;
 }
 
-- 
1.8.1.4