On Mon, 23 Sep 2024, Bernhard Beschow wrote:
The CCSR space is just a container which is meant to be covered by platform
device memory regions. However, QEMU only implements a subset of these devices.
Add some logging to see which devices a guest attempts to access.
An aleternative solution for a similar problem is this:
https://patchew.org/QEMU/20240520101007.a25a34e6...@zero.eik.bme.hu/
I don't know if that would be simpler for this device as well.
Regards,
BALATON Zoltan
Signed-off-by: Bernhard Beschow <shen...@gmail.com>
---
hw/ppc/ppce500_ccsr.c | 33 +++++++++++++++++++++++++++++++--
hw/ppc/trace-events | 3 +++
2 files changed, 34 insertions(+), 2 deletions(-)
diff --git a/hw/ppc/ppce500_ccsr.c b/hw/ppc/ppce500_ccsr.c
index 191a9ceec3..28942b2348 100644
--- a/hw/ppc/ppce500_ccsr.c
+++ b/hw/ppc/ppce500_ccsr.c
@@ -15,14 +15,43 @@
*/
#include "qemu/osdep.h"
+#include "qemu/log.h"
#include "e500-ccsr.h"
+#include "trace.h"
+
+static uint64_t ppce500_ccsr_io_read(void *opaque, hwaddr addr, unsigned size)
+{
+ uint64_t value = 0;
+
+ trace_ppce500_ccsr_io_read(addr, value, size);
+ qemu_log_mask(LOG_UNIMP,
+ "%s: unimplemented [0x%" HWADDR_PRIx "] -> 0\n",
+ __func__, addr);
+
+ return value;
+}
+
+static void ppce500_ccsr_io_write(void *opaque, hwaddr addr, uint64_t value,
+ unsigned size)
+{
+ trace_ppce500_ccsr_io_write(addr, value, size);
+ qemu_log_mask(LOG_UNIMP,
+ "%s: unimplemented [0x%" HWADDR_PRIx "] <- 0x%" PRIx32 "\n",
+ __func__, addr, (uint32_t)value);
+}
+
+static const MemoryRegionOps ppce500_ccsr_ops = {
+ .read = ppce500_ccsr_io_read,
+ .write = ppce500_ccsr_io_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
static void e500_ccsr_init(Object *obj)
{
PPCE500CCSRState *ccsr = CCSR(obj);
- memory_region_init(&ccsr->ccsr_space, obj, "e500-ccsr",
- MPC8544_CCSRBAR_SIZE);
+ memory_region_init_io(&ccsr->ccsr_space, obj, &ppce500_ccsr_ops, obj,
+ "e500-ccsr", MPC8544_CCSRBAR_SIZE);
sysbus_init_mmio(SYS_BUS_DEVICE(ccsr), &ccsr->ccsr_space);
}
diff --git a/hw/ppc/trace-events b/hw/ppc/trace-events
index 1f125ce841..ca4c231c9f 100644
--- a/hw/ppc/trace-events
+++ b/hw/ppc/trace-events
@@ -143,6 +143,9 @@ ppc_irq_cpu(const char *action) "%s"
ppc_dcr_read(uint32_t addr, uint32_t val) "DRCN[0x%x] -> 0x%x"
ppc_dcr_write(uint32_t addr, uint32_t val) "DRCN[0x%x] <- 0x%x"
+ppce500_ccsr_io_read(uint32_t index, uint32_t val, uint8_t size) "[0x%" PRIx32 "] -> 0x%08x
(size: 0x%" PRIu8 ")"
+ppce500_ccsr_io_write(uint32_t index, uint32_t val, uint8_t size) "[0x%" PRIx32 "] <- 0x%08x
(size: 0x%" PRIu8 ")"
+
# prep_systemio.c
prep_systemio_read(uint32_t addr, uint32_t val) "read addr=0x%x val=0x%x"
prep_systemio_write(uint32_t addr, uint32_t val) "write addr=0x%x val=0x%x"
