More keyboard controller clean-ups and fixes to mem/mem.c and port_92.c - OS/2 1.3 now works on IBM PS/2 MCA machines.

src/port_92.c

@@ -69,11 +69,18 @@ port_92_readw(uint16_t port, void *priv)
     return ret;
 }
 
+/*
+   This does the exact same thing as keyboard controller reset.
+   TODO: ALi M1543(c) behavior.
+ */
 static void
 port_92_pulse(void *priv)
 {
-    resetx86();
+    softresetx86(); /* Pulse reset! */
     cpu_set_edx();
+    flushmmucache();
+
+    cpu_alt_reset = 1;
 }
 
 static void
@@ -166,6 +173,15 @@ port_92_remove(void *priv)
                          port_92_readb, NULL, NULL, port_92_writeb, NULL, NULL, dev);
 }
 
+static void
+port_92_reset(void *priv)
+{
+    cpu_alt_reset = 0;
+
+    mem_a20_alt = 0x00;
+    mem_a20_recalc();
+}
+
 static void
 port_92_close(void *priv)
 {
@@ -252,7 +268,7 @@ const device_t port_92_pci_device = {
     .local         = PORT_92_PCI,
     .init          = port_92_init,
     .close         = port_92_close,
-    .reset         = NULL,
+    .reset         = port_92_reset,
     { .available = NULL },
     .speed_changed = NULL,
     .force_redraw  = NULL,