-/*!
+/**
* \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction. Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License. This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
* Copyright 2004 Develer S.r.l. (http://www.develer.com/)
- * All Rights Reserved.
+ *
+ * -->
*
* \version $Id$
*
* \brief DSP5680x task switching support
*/
-/*
- * $Log$
- * Revision 1.1 2004/05/23 17:27:00 bernie
- * Import kern/ subdirectory.
- *
- */
+/*#*
+ *#* $Log$
+ *#* Revision 1.7 2006/07/19 12:56:27 bernie
+ *#* Convert to new Doxygen style.
+ *#*
+ *#* Revision 1.6 2006/02/24 01:17:05 bernie
+ *#* Update for new emulator.
+ *#*
+ *#* Revision 1.5 2005/11/04 16:20:02 bernie
+ *#* Fix reference to README.devlib in header.
+ *#*
+ *#* Revision 1.4 2004/08/25 14:12:09 rasky
+ *#* Aggiornato il comment block dei log RCS
+ *#*
+ *#* Revision 1.3 2004/07/30 14:24:16 rasky
+ *#* Task switching con salvataggio perfetto stato di interrupt (SR)
+ *#* Kernel monitor per dump informazioni su stack dei processi
+ *#*
+ *#* Revision 1.2 2004/06/03 11:27:09 bernie
+ *#* Add dual-license information.
+ *#*
+ *#* Revision 1.1 2004/05/23 17:27:00 bernie
+ *#* Import kern/ subdirectory.
+ *#*
+ *#*/
void asm_switch_context(void ** new_sp/*R2*/, void ** save_sp/*R3*/);
asm void asm_switch_context(void ** new_sp, void ** save_sp)
{
lea (SP)+
- move n,x:(SP)+
- move x0,x:(SP)+
- move y0,x:(SP)+
- move y1,x:(SP)+
- move a0,x:(SP)+
- move a1,x:(SP)+
- move a2,x:(SP)+
- move b0,x:(SP)+
- move b1,x:(SP)+
- move b2,x:(SP)+
- move r0,x:(SP)+
- move r1,x:(SP)+
- move r2,x:(SP)+
- move r3,x:(SP)+
-
- move omr,x:(SP)+
- move la,x:(SP)+
- move m01,x:(SP)+
- move lc,x:(SP)+
-
- ;
- ; save hardware stack
- ;
- move hws,x:(SP)+
- move hws,x:(SP)+
; From the manual:
; The compiler uses page 0 address locations X: 0x0030 - 0x003F as register
move y1,x:(SP)+
move x:<$3F,y1
move y1,x:(SP)
-
- ;
- ; 28 words have been pushed on the stack.
+
+ ;
+ ; Switch stacks
nop
move SP, x:(R3)
nop
move x:(R2), SP
nop
+ ;
+ ; restore all saved registers
+ ;
pop y1
move y1,x:<$3F
pop y1
pop y1
move y1,x:<$38
- ;
- ; restore hardware stack
- ;
- move hws,la ; Clear HWS to ensure proper reload
- move hws,la
- pop HWS
- pop HWS
-
- ;
- ; restore all saved registers
- ;
- pop lc
- pop m01
- pop la
- pop omr
-
- pop r3
- pop r2
- pop r1
- pop r0
- pop b2
- pop b1
- pop b0
- pop a2
- pop a1
- pop a0
-
- pop y1
- pop y0
- pop x0
+ ; SR is already pushed on the stack (normal call context). Use RTI to restore
+ ; it, so that interrupt status is preserved across the tasks.
+ rti
+}
- pop n
-
- rts
+int asm_switch_version(void);
+int asm_switch_version(void)
+{
+ return 1;
}