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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
2011,2012 Giovanni Di Sirio.
This file is part of ChibiOS/RT.
ChibiOS/RT 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 3 of the License, or
(at your option) any later version.
ChibiOS/RT 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, see <http://www.gnu.org/licenses/>.
*/
/**
* @file MSP430/chcore.c
* @brief MSP430 architecture port code.
*
* @addtogroup MSP430_CORE
* @{
*/
#include "ch.h"
/**
* @brief Performs a context switch between two threads.
* @details This is the most critical code in any port, this function
* is responsible for the context switch between 2 threads.
* @note The implementation of this code affects <b>directly</b> the context
* switch performance so optimize here as much as you can.
* @note The function is declared as a weak symbol, it is possible to
* redefine it in your application code.
*
* @param[in] ntp the thread to be switched in
* @param[in] otp the thread to be switched out
*/
#if defined(__IAR_SYSTEMS_ICC__)
#if !defined(__DOXYGEN__)
#pragma no_epilogue
#endif
void port_switch(Thread *ntp, Thread *otp) {
asm ("pushm.a #8, r11");
asm ("mova sp, 10(r13)"); /* Save the current stack pointer (otp-Thread). */
asm ("mova 10(r12), sp"); /* Restore old pointer (of ntp-Thread). */
asm ("popm.a #8, r11");
}
#else
#if !defined(__DOXYGEN__)
__attribute__((naked, weak))
#endif
void port_switch(Thread *ntp, Thread *otp) {
register struct intctx *sp asm("r1");
asm volatile ("pushm.a #8, r11" : : : "memory");
otp->p_ctx.sp = sp;
sp = ntp->p_ctx.sp;
asm volatile ("popm.a #8, r11 \n\t" \
"reta" : : "r" (sp) : "memory");
}
#endif
/**
* @brief Halts the system.
* @details This function is invoked by the operating system when an
* unrecoverable error is detected (for example because a programming
* error in the application code that triggers an assertion while in
* debug mode).
* @note The function is declared as a weak symbol, it is possible to
* redefine it in your application code.
*/
#if !defined(__DOXYGEN__)
#if !defined(__IAR_SYSTEMS_ICC__)
__attribute__((weak))
#endif
#endif
void port_halt(void) {
port_disable();
while (TRUE) {
}
}
#if defined(__IAR_SYSTEMS_ICC__)
#pragma required=chThdExit /* http://tech.groups.yahoo.com/group/msp430/message/32860 */
#endif
/**
* @brief Start a thread by invoking its work function.
* @details If the work function returns @p chThdExit() is automatically
* invoked.
*/
void _port_thread_start(void) {
chSysUnlock();
#if defined(__IAR_SYSTEMS_ICC__)
asm("mova r11, r12"); /* Pass arg to thread (with IAR-Compiler). */
#else
asm("mova r11, r15"); /* Pass arg to thread (with GCC-Compiler). */
#endif
asm("calla r10"); /* Start thread. */
asm("calla #chThdExit"); /* Perform clean up on thread return. */
}
/** @} */
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