XBIOS in interrupt not usable under MiNT

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401096

README.MiNT

@@ -204,7 +204,7 @@ VBL timer driver:
 
 Audio drivers:
 	Cookies _SND, MCSN, STFA and GSXB used to detect supported audio
-	capabilities.
+	capabilities. Note: XBIOS and MCSN drivers can not be used under MiNT.
 
 	STE, Mega STE, TT:
 		8 bits DMA (hardware access)

src/audio/mint/SDL_mintaudio_mcsn.c

@@ -82,8 +82,14 @@ static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
 
 static int Audio_Available(void)
 {
+	unsigned long dummy;
 	const char *envr = getenv("SDL_AUDIODRIVER");
 
+	/* We can't use XBIOS in interrupt under MiNT */
+	if (Getcookie(C_MiNT, &dummy) == C_FOUND) {
+		return(0);
+	}
+
 	/* Check if user asked a different audio driver */
 	if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
 		DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));

src/audio/mint/SDL_mintaudio_xbios.c

@@ -82,8 +82,14 @@ static void Mint_InitAudio(_THIS, SDL_AudioSpec *spec);
 
 static int Audio_Available(void)
 {
+	unsigned long dummy;
 	const char *envr = getenv("SDL_AUDIODRIVER");
 
+	/* We can't use XBIOS in interrupt under MiNT */
+	if (Getcookie(C_MiNT, &dummy) == C_FOUND) {
+		return(0);
+	}
+
 	/* Check if user asked a different audio driver */
 	if ((envr) && (strcmp(envr, MINT_AUDIO_DRIVER_NAME)!=0)) {
 		DEBUG_PRINT((DEBUG_NAME "user asked a different audio driver\n"));