Add reset support.

Signed-off-by: Angelo Dureghello <angelo@kernel-space.org>
---
 hw/m68k/mcf5208.c | 51 ++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 48 insertions(+), 3 deletions(-)

diff --git a/hw/m68k/mcf5208.c b/hw/m68k/mcf5208.c
index 0cfb806c20..b1ab3896d0 100644
--- a/hw/m68k/mcf5208.c
+++ b/hw/m68k/mcf5208.c
@@ -20,6 +20,7 @@
 #include "hw/ptimer.h"
 #include "sysemu/sysemu.h"
 #include "sysemu/qtest.h"
+#include "sysemu/runstate.h"
 #include "net/net.h"
 #include "hw/boards.h"
 #include "hw/loader.h"
@@ -40,6 +41,8 @@
 #define PCSR_PRE_SHIFT  8
 #define PCSR_PRE_MASK   0x0f00
 
+#define RCR_SOFTRST     0x80
+
 typedef struct {
     MemoryRegion iomem;
     qemu_irq irq;
@@ -185,13 +188,55 @@ static const MemoryRegionOps m5208_sys_ops = {
     .endianness = DEVICE_NATIVE_ENDIAN,
 };
 
-static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic)
+static uint64_t m5208_rcm_read(void *opaque, hwaddr addr,
+                               unsigned size)
+{
+    qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
+                  __func__, addr);
+    return 0;
+}
+
+static void m5208_rcm_write(void *opaque, hwaddr addr,
+                            uint64_t value, unsigned size)
+{
+    switch (addr) {
+    case 0x0: /* RCR */
+        if (value & RCR_SOFTRST) {
+            M68kCPU *cpu = opaque;
+            CPUState *cs = CPU(cpu);
+
+            cpu_reset(cs);
+            cpu->env.aregs[7] = ldl_phys(cs->as, 0);
+            cpu->env.pc = ldl_phys(cs->as, 4);
+            //qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
+        }
+        break;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n",
+                      __func__, addr);
+        break;
+    }
+}
+
+static const MemoryRegionOps m5208_rcm_ops = {
+    .read = m5208_rcm_read,
+    .write = m5208_rcm_write,
+    .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void mcf5208_sys_init(MemoryRegion *address_space, qemu_irq *pic,
+                             M68kCPU *cpu)
 {
-    MemoryRegion *iomem = g_new(MemoryRegion, 1);
+    MemoryRegion *iomem;
     m5208_timer_state *s;
     int i;
 
+    /* RCM */
+    iomem = g_new(MemoryRegion, 1);
+    memory_region_init_io(iomem, NULL, &m5208_rcm_ops, cpu, "m5208-rcm", 0x00000080);
+    memory_region_add_subregion(address_space, 0xfc0a0000, iomem);
     /* SDRAMC.  */
+    iomem = g_new(MemoryRegion, 1);
     memory_region_init_io(iomem, NULL, &m5208_sys_ops, NULL, "m5208-sys", 0x00004000);
     memory_region_add_subregion(address_space, 0xfc0a8000, iomem);
     /* Timers.  */
@@ -265,7 +310,7 @@ static void mcf5208evb_init(MachineState *machine)
     mcf_uart_create_mmap(0xfc064000, pic[27], serial_hd(1));
     mcf_uart_create_mmap(0xfc068000, pic[28], serial_hd(2));
 
-    mcf5208_sys_init(address_space_mem, pic);
+    mcf5208_sys_init(address_space_mem, pic, cpu);
 
     mcf_fec_init(address_space_mem, 0xfc030000, pic + 36);
 
-- 
2.44.0