+++ /dev/null
-/**
- * \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/)
- *
- * -->
- *
- * \version $Id$
- *
- * \author Giovanni Bajo <rasky@develer.com>
- *
- * \brief DSP5680x task switching support
- */
-
-/*#*
- *#* $Log$
- *#* 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)+
-
- ; From the manual:
- ; The compiler uses page 0 address locations X: 0x0030 - 0x003F as register
- ; variables. Frequently accessed local variables are assigned to the page 0
- ; registers instead of to stack locations so that load and store instructions
- ; are shortened. Addresses X: 0x0030 - 0x0037 (page 0 registers MR0-MR7) are
- ; volatile registers and can be overwritten. The remaining registers (page 0
- ; registers MR8-MR15) are treated as non-volatile and, if used by a routine,
- ; must be saved on entry and restored on exit.
- ;
- ; So, register 0x30-0x37 are caller-save, while 0x38-0x3F are callee-save.
- move x:<$38,y1
- move y1,x:(SP)+
- move x:<$39,y1
- move y1,x:(SP)+
- move x:<$3A,y1
- move y1,x:(SP)+
- move x:<$3B,y1
- move y1,x:(SP)+
- move x:<$3C,y1
- move y1,x:(SP)+
- move x:<$3D,y1
- move y1,x:(SP)+
- move x:<$3E,y1
- move y1,x:(SP)+
- move x:<$3F,y1
- move y1,x:(SP)
-
- ;
- ; 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
- move y1,x:<$3E
- pop y1
- move y1,x:<$3D
- pop y1
- move y1,x:<$3C
- pop y1
- move y1,x:<$3B
- pop y1
- move y1,x:<$3A
- pop y1
- move y1,x:<$39
- pop y1
- move y1,x:<$38
-
- ; 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
-}
-
-int asm_switch_version(void);
-int asm_switch_version(void)
-{
- return 1;
-}
projects / bertos.git / blobdiff