102 lines
3.8 KiB
C
102 lines
3.8 KiB
C
/*
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ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
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This file is part of ChibiOS/RT.
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ChibiOS/RT is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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ChibiOS/RT is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file MSP430/chcore.c
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* @brief MSP430 architecture port code.
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*
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* @addtogroup MSP430_CORE
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* @{
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*/
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#include "ch.h"
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/**
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* @brief Performs a context switch between two threads.
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* @details This is the most critical code in any port, this function
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* is responsible for the context switch between 2 threads.
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* @note The implementation of this code affects <b>directly</b> the context
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* switch performance so optimize here as much as you can.
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* @note The function is declared as a weak symbol, it is possible to
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* redefine it in your application code.
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*
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* @param[in] ntp the thread to be switched in
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* @param[in] otp the thread to be switched out
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((naked, weak))
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#endif
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void port_switch(Thread *ntp, Thread *otp) {
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register struct intctx *sp asm("r1");
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asm volatile ("push r11 \n\t" \
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"push r10 \n\t" \
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"push r9 \n\t" \
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"push r8 \n\t" \
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"push r7 \n\t" \
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"push r6 \n\t" \
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"push r6 \n\t" \
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"push r4");
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otp->p_ctx.sp = sp;
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sp = ntp->p_ctx.sp;
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asm volatile ("pop r4 \n\t" \
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"pop r5 \n\t" \
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"pop r6 \n\t" \
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"pop r7 \n\t" \
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"pop r8 \n\t" \
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"pop r9 \n\t" \
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"pop r10 \n\t" \
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"pop r11 \n\t" \
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"ret" : : "r" (sp));
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}
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/**
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* @brief Halts the system.
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* @details This function is invoked by the operating system when an
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* unrecoverable error is detected (as example because a programming
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* error in the application code that triggers an assertion while in
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* debug mode).
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* @note The function is declared as a weak symbol, it is possible to
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* redefine it in your application code.
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*/
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#if !defined(__DOXYGEN__)
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__attribute__((weak))
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#endif
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void port_halt(void) {
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port_disable();
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while (TRUE) {
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}
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}
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/**
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* @brief Start a thread by invoking its work function.
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* @details If the work function returns @p chThdExit() is automatically
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* invoked.
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*/
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void _port_thread_start(void) {
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asm volatile ("eint \n\t" \
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"mov r11, r15 \n\t" \
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"call r10 \n\t" \
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"call #chThdExit");
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}
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/** @} */
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