hw/i386/vmport: Define enum for all commands

No functional change.

Defining an enum for all VMPort commands have the following advantages:
* It gets rid of the error-prone requirement to update VMPORT_ENTRIES
when new VMPort commands are added to QEMU.
* It makes it clear to know by looking at one place at the source, what
are all the VMPort commands supported by QEMU.
Reviewed-by: NNikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: NLiran Alon <liran.alon@oracle.com>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20200312165431.82118-9-liran.alon@oracle.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/i386/vmmouse.c

@@ -34,12 +34,6 @@
 /* debug only vmmouse */
 //#define DEBUG_VMMOUSE
 
-/* VMMouse Commands */
-#define VMMOUSE_GETVERSION	10
-#define VMMOUSE_DATA		39
-#define VMMOUSE_STATUS		40
-#define VMMOUSE_COMMAND		41
-
 #define VMMOUSE_READ_ID			0x45414552
 #define VMMOUSE_DISABLE			0x000000f5
 #define VMMOUSE_REQUEST_RELATIVE	0x4c455252
@@ -217,10 +211,10 @@ static uint32_t vmmouse_ioport_read(void *opaque, uint32_t addr)
     command = data[2] & 0xFFFF;
 
     switch (command) {
-    case VMMOUSE_STATUS:
+    case VMPORT_CMD_VMMOUSE_STATUS:
         data[0] = vmmouse_get_status(s);
         break;
-    case VMMOUSE_COMMAND:
+    case VMPORT_CMD_VMMOUSE_COMMAND:
         switch (data[1]) {
         case VMMOUSE_DISABLE:
             vmmouse_disable(s);
@@ -239,7 +233,7 @@ static uint32_t vmmouse_ioport_read(void *opaque, uint32_t addr)
             break;
         }
         break;
-    case VMMOUSE_DATA:
+    case VMPORT_CMD_VMMOUSE_DATA:
         vmmouse_data(s, data, data[1]);
         break;
     default:
@@ -296,9 +290,9 @@ static void vmmouse_realizefn(DeviceState *dev, Error **errp)
         return;
     }
 
-    vmport_register(VMMOUSE_STATUS, vmmouse_ioport_read, s);
-    vmport_register(VMMOUSE_COMMAND, vmmouse_ioport_read, s);
-    vmport_register(VMMOUSE_DATA, vmmouse_ioport_read, s);
+    vmport_register(VMPORT_CMD_VMMOUSE_STATUS, vmmouse_ioport_read, s);
+    vmport_register(VMPORT_CMD_VMMOUSE_COMMAND, vmmouse_ioport_read, s);
+    vmport_register(VMPORT_CMD_VMMOUSE_DATA, vmmouse_ioport_read, s);
 }
 
 static Property vmmouse_properties[] = {

hw/i386/vmport.c

@@ -37,10 +37,6 @@
 #include "cpu.h"
 #include "trace.h"
 
-#define VMPORT_CMD_GETVERSION 0x0a
-#define VMPORT_CMD_GETRAMSIZE 0x14
-
-#define VMPORT_ENTRIES 0x2c
 #define VMPORT_MAGIC   0x564D5868
 
 /* Compatibility flags for migration */
@@ -71,12 +67,9 @@ typedef struct VMPortState {
 
 static VMPortState *port_state;
 
-void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque)
+void vmport_register(VMPortCommand command, VMPortReadFunc *func, void *opaque)
 {
-    if (command >= VMPORT_ENTRIES) {
-        return;
-    }
-
+    assert(command < VMPORT_ENTRIES);
     trace_vmport_register(command, func, opaque);
     port_state->func[command] = func;
     port_state->opaque[command] = opaque;

include/hw/i386/vmport.h

@@ -6,11 +6,20 @@
 #define TYPE_VMPORT "vmport"
 typedef uint32_t (VMPortReadFunc)(void *opaque, uint32_t address);
 
+typedef enum {
+    VMPORT_CMD_GETVERSION       = 10,
+    VMPORT_CMD_GETRAMSIZE       = 20,
+    VMPORT_CMD_VMMOUSE_DATA     = 39,
+    VMPORT_CMD_VMMOUSE_STATUS   = 40,
+    VMPORT_CMD_VMMOUSE_COMMAND  = 41,
+    VMPORT_ENTRIES
+} VMPortCommand;
+
 static inline void vmport_init(ISABus *bus)
 {
     isa_create_simple(bus, TYPE_VMPORT);
 }
 
-void vmport_register(unsigned char command, VMPortReadFunc *func, void *opaque);
+void vmport_register(VMPortCommand command, VMPortReadFunc *func, void *opaque);
 
 #endif