m68k: implement more ColdFire 5208 interrupt controller functionality

Implement the SIMR and CIMR registers of the 5208 interrupt controller.
These are used by modern versions of Linux running on ColdFire (not sure
of the exact version they were introduced, but they have been in for quite
a while now).

Without this change when attempting to run a linux-3.5 kernel you will
see:

  qemu: hardware error: mcf_intc_write: Bad write offset 28

and execution will stop and dump out.

Signed-off-by: Greg Ungerer <gerg@uclinux.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Message-id: 1434721406-25288-2-git-send-email-gerg@uclinux.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/hw/m68k/mcf_intc.c b/hw/m68k/mcf_intc.c
index 621423c..f13c7f3 100644
--- a/hw/m68k/mcf_intc.c
+++ b/hw/m68k/mcf_intc.c
@@ -102,6 +102,20 @@ static void mcf_intc_write(void *opaque, hwaddr addr,
     case 0x0c:
         s->imr = (s->imr & 0xffffffff00000000ull) | (uint32_t)val;
         break;
+    case 0x1c:
+        if (val & 0x40) {
+            s->imr = ~0ull;
+        } else {
+            s->imr |= (0x1ull << (val & 0x3f));
+        }
+        break;
+    case 0x1d:
+        if (val & 0x40) {
+            s->imr = 0ull;
+        } else {
+            s->imr &= ~(0x1ull << (val & 0x3f));
+        }
+        break;
     default:
         hw_error("mcf_intc_write: Bad write offset %d\n", offset);
         break;