Try to hard-reboot on rerun of post even on emulators.

Extend the hard-reboot logic to qemu and kvm.  On qemu, a reboot will
not reset the memory settings for 0xc0000-0xfffff, so copy that memory
area manually before rebooting.  Unfortunately, kvm does not keep a
pristine copy of the BIOS at 0xffff0000, so detect that case and
shutdown the machine.

1 files changed, 10 insertions, 4 deletions

diff --git a/src/apm.c b/src/apm.c
index 1b151e9..2029ae2 100644
--- a/src/apm.c
+++ b/src/apm.c
@@ -105,6 +105,15 @@ handle_155306(struct bregs *regs)
     set_success(regs);
 }
 
+void
+apm_shutdown(void)
+{
+    irq_disable();
+    out_str("Shutdown");
+    for (;;)
+        hlt();
+}
+
 // APM Set Power State
 static void
 handle_155307(struct bregs *regs)
@@ -121,10 +130,7 @@ handle_155307(struct bregs *regs)
         out_str("Suspend");
         break;
     case 3:
-        irq_disable();
-        out_str("Shutdown");
-        for (;;)
-            hlt();
+        apm_shutdown();
         break;
     }
     set_success(regs);