Renamed 'secondary' to 'backyard' on popular demand ;-))

backyard/platform/c64/lib/mtarch.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2004, Adam Dunkels.
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ *
+ * This file is part of the Contiki operating system.
+ * 
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: mtarch.c,v 1.1 2007/05/23 23:11:28 oliverschmidt Exp $
+ */
+#include "mtarch.h"
+#include <string.h>
+
+unsigned char  mtarch_asm_threadspreg;
+unsigned char *mtarch_asm_threadsp;
+unsigned char *mtarch_asm_threadzp;
+unsigned char *mtarch_asm_threadstack;
+
+void mtarch_asm_start(void);
+void mtarch_asm_exec(void);
+
+
+/*--------------------------------------------------------------------------*/
+void
+mtarch_start(struct mtarch_thread *thread,
+	     void (* function)(void *data),
+	     void *data)
+{
+  memset(thread->cpustack, 0, sizeof(thread->cpustack));
+  memset(thread->cstack, 0, sizeof(thread->cstack));
+  
+  /* Create a CPU stack frame with the appropriate values... */
+  thread->cpustack[MTARCH_CPUSTACKSIZE - 2] = ((unsigned short)function) >> 8; /* high byte of return address. */
+  thread->cpustack[MTARCH_CPUSTACKSIZE - 3] = ((unsigned short)function) & 0xff; /* low byte of return address. */
+  thread->cpustack[MTARCH_CPUSTACKSIZE - 4] = 0x21; /* processor flags. */
+  thread->cpustack[MTARCH_CPUSTACKSIZE - 5] =       /* a register */
+    thread->cpustack[MTARCH_CPUSTACKSIZE - 6] =     /* x register */
+    thread->cpustack[MTARCH_CPUSTACKSIZE - 7] = 0;  /* y register */
+  thread->spreg = MTARCH_CPUSTACKSIZE - 8;
+
+  /* Setup the C stack with the data pointer. */
+  thread->sp = &thread->cstack[MTARCH_CSTACKSIZE - 1];
+  
+  mtarch_asm_threadzp    = &(thread->zp);  
+  mtarch_asm_start();
+}
+/*--------------------------------------------------------------------------*/
+void
+mtarch_exec(struct mtarch_thread *thread)
+{
+  /* Switch processor stack. The call to mtarch_asm_switch() will not
+     return until the process that we switch to calls yield(). */
+  mtarch_asm_threadspreg = thread->spreg;
+  mtarch_asm_threadsp    = thread->sp;
+
+  mtarch_asm_threadstack = &(thread->cpustack[0]);  
+  mtarch_asm_threadzp    = &(thread->zp[0]);
+  
+  mtarch_asm_exec();
+
+  thread->sp = mtarch_asm_threadsp;
+  thread->spreg = mtarch_asm_threadspreg;  
+}
+/*--------------------------------------------------------------------------*/
+void
+mtarch_init(void) {
+
+}
+/*--------------------------------------------------------------------------*/
+void
+mtarch_remove(void)
+{
+
+}