kdrive: add KdOsInit

Kdrive X servers used to do the OS-speciffic init part using KdOsInit.
This was changed in modern Xorg because Xephyr is the only kdrive
X server there, so there was no need to keep this generic.
Since we want to eventually add Xfbdev, we need to add this back.

Signed-off-by: stefan11111 <stefan11111@shitposting.expert>

hw/kdrive/src/kdrive.c

@@ -91,6 +91,14 @@ const char *kdGlobalXkbLayout = NULL;
 const char *kdGlobalXkbVariant = NULL;
 const char *kdGlobalXkbOptions = NULL;
 
+
+/*
+ * Carry arguments from InitOutput through driver initialization
+ * to KdScreenInit
+ */
+
+KdOsFuncs *kdOsFuncs = NULL;
+
 void
 KdDisableScreen(ScreenPtr pScreen)
 {
@@ -517,6 +525,19 @@ KdProcessArgument(int argc, char **argv, int i)
     return 0;
 }
 
+void
+KdOsInit(KdOsFuncs * pOsFuncs)
+{
+    kdOsFuncs = pOsFuncs;
+    if (pOsFuncs) {
+        if (serverGeneration == 1) {
+            KdDoSwitchCmd("start");
+            if (pOsFuncs->Init)
+                (*pOsFuncs->Init) ();
+        }
+    }
+}
+
 static Bool
 KdAllocatePrivates(ScreenPtr pScreen)
 {

hw/kdrive/src/kdrive.h

@@ -278,6 +278,16 @@ int KdAddConfigKeyboard(const char *pointer);
 int KdAddKeyboard(KdKeyboardInfo * ki);
 void KdRemoveKeyboard(KdKeyboardInfo * ki);
 
+typedef struct _KdOsFuncs {
+    int (*Init) (void); /* Only called when the X server is started, when serverGeneration == 1 */
+    void (*Enable) (void);
+    Bool (*SpecialKey) (KeySym);
+    void (*Disable) (void);
+    void (*Fini) (void);
+    void (*pollEvents) (void);
+    void (*Bell) (int, int, int);
+} KdOsFuncs;
+
 typedef struct _KdPointerMatrix {
     int matrix[2][3];
 } KdPointerMatrix;
@@ -289,6 +299,8 @@ extern DevPrivateKeyRec kdScreenPrivateKeyRec;
 extern Bool kdEmulateMiddleButton;
 extern Bool kdDisableZaphod;
 
+extern KdOsFuncs *kdOsFuncs;
+
 #define KdGetScreenPriv(pScreen) ((KdPrivScreenPtr) \
     dixLookupPrivate(&(pScreen)->devPrivates, kdScreenPrivateKey))
 #define KdSetScreenPriv(pScreen,v) \
@@ -345,6 +357,9 @@ void
 int
  KdProcessArgument(int argc, char **argv, int i);
 
+void
+ KdOsInit(KdOsFuncs * pOsFuncs);
+
 void
  KdOsAddInputDrivers(void);