New extended memory API

git-svn-id: svn://svn.cc65.org/cc65/trunk@1678 b7a2c559-68d2-44c3-8de9-860c34a00d81
2002-11-29 14:46:56 +00:00
parent 5de8af4f8f
commit 4c4e5def21
11 changed files with 456 additions and 0 deletions
--- a/libsrc/em/em_unload.s
+++ b/libsrc/em/em_unload.s
@@ -0,0 +1,32 @@
+;
+; Ullrich von Bassewitz, 2002-11-29
+;
+; unsigned char __fastcall__ em_unload (void);
+; /* Unload the currently loaded driver. */
+
+
+        .include        "em-kernel.inc"
+        .include        "em-error.inc"
+        .include        "modload.inc"
+
+	.import		return0
+
+
+_em_unload:
+	lda	_em_drv
+	ora	_em_drv+1
+       	beq    	no_driver		; No driver
+
+	jsr	_em_deinstall		; Deinstall the driver
+
+        lda     _em_drv
+        ldx     _em_drv+1
+        jsr     _mod_free               ; Free the driver
+
+	jmp	return0
+
+no_driver:
+	tax				; X = 0
+	lda	#EM_ERR_NO_DRIVER
+	rts
+