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/*
ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 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"
/**
* Performs a context switch between two threads.
* @param otp the thread to be switched out
* @param ntp the thread to be switched in
* @note The function is declared as a weak symbol, it is possible to redefine
* it in your application code.
*/
/** @cond never */
__attribute__((naked, weak))
/** @endcond */
void port_switch(Thread *otp, Thread *ntp) {
register struct intctx *sp asm("r1");
asm volatile ("push r11 \n\t" \
"push r10 \n\t" \
"push r9 \n\t" \
"push r8 \n\t" \
"push r7 \n\t" \
"push r6 \n\t" \
"push r6 \n\t" \
"push r4");
otp->p_ctx.sp = sp;
sp = ntp->p_ctx.sp;
asm volatile ("pop r4 \n\t" \
"pop r5 \n\t" \
"pop r6 \n\t" \
"pop r7 \n\t" \
"pop r8 \n\t" \
"pop r9 \n\t" \
"pop r10 \n\t" \
"pop r11 \n\t" \
"ret" : : "r" (sp));
}
/**
* Disables the interrupts and halts the system.
* @note The function is declared as a weak symbol, it is possible to redefine
* it in your application code.
*/
/** @cond never */
__attribute__((weak))
/** @endcond */
void port_halt(void) {
port_disable();
while (TRUE) {
}
}
/**
* Start a thread by invoking its work function.
* If the work function returns @p chThdExit() is automatically invoked.
*/
void threadstart(void) {
asm volatile ("eint \n\t" \
"mov r11, r15 \n\t" \
"call r10 \n\t" \
"call #chThdExit");
}
/** @} */
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