/*
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 .
*/
/**
* @file chsys.h
* @brief System related macros and structures.
*
* @addtogroup system
* @{
*/
#ifndef _CHSYS_H_
#define _CHSYS_H_
/**
* @name Macro Functions
* @{
*/
#if !CH_NO_IDLE_THREAD || defined(__DOXYGEN__)
/**
* @brief Returns a pointer to the idle thread.
* @pre In order to use this function the option @p CH_NO_IDLE_THREAD
* must be disabled.
* @note The reference counter of the idle thread is not incremented but
* it is not strictly required being the idle thread a static
* object.
*
* @return Pointer to the idle thread.
*
* @api
*/
#define chSysGetIdleThread() (rlist.r_queue.p_prev)
#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 Can be invoked from any system state.
*
* @special
*/
#if !defined(SYSTEM_HALT_HOOK) || defined(__DOXYGEN__)
#define chSysHalt() port_halt()
#else
#define chSysHalt() { \
SYSTEM_HALT_HOOK(); \
port_halt(); \
}
#endif
/**
* @brief Performs a context switch.
* @note Not a user function, it is meant to be invoked by the scheduler
* itself or from within the port layer.
*
* @param[in] ntp the thread to be switched in
* @param[in] otp the thread to be switched out
*
* @special
*/
#define chSysSwitch(ntp, otp) { \
dbg_trace(otp); \
THREAD_CONTEXT_SWITCH_HOOK(ntp, otp); \
port_switch(ntp, otp); \
}
/**
* @brief Raises the system interrupt priority mask to the maximum level.
* @details All the maskable interrupt sources are disabled regardless their
* hardware priority.
* @note Do not invoke this API from within a kernel lock.
*
* @special
*/
#define chSysDisable() { \
port_disable(); \
dbg_check_disable(); \
}
/**
* @brief Raises the system interrupt priority mask to system level.
* @details The interrupt sources that should not be able to preempt the kernel
* are disabled, interrupt sources with higher priority are still
* enabled.
* @note Do not invoke this API from within a kernel lock.
* @note This API is no replacement for @p chSysLock(), the @p chSysLock()
* could do more than just disable the interrupts.
*
* @special
*/
#define chSysSuspend() { \
port_suspend(); \
dbg_check_suspend(); \
}
/**
* @brief Lowers the system interrupt priority mask to user level.
* @details All the interrupt sources are enabled.
* @note Do not invoke this API from within a kernel lock.
* @note This API is no replacement for @p chSysUnlock(), the
* @p chSysUnlock() could do more than just enable the interrupts.
*
* @special
*/
#define chSysEnable() { \
dbg_check_enable(); \
port_enable(); \
}
/**
* @brief Enters the kernel lock mode.
*
* @special
*/
#define chSysLock() { \
port_lock(); \
dbg_check_lock(); \
}
/**
* @brief Leaves the kernel lock mode.
*
* @special
*/
#define chSysUnlock() { \
dbg_check_unlock(); \
port_unlock(); \
}
/**
* @brief Enters the kernel lock mode from within an interrupt handler.
* @note This API may do nothing on some architectures, it is required
* because on ports that support preemptable interrupt handlers
* it is required to raise the interrupt mask to the same level of
* the system mutual exclusion zone.
* It is good practice to invoke this API before invoking any I-class
* syscall from an interrupt handler.
* @note This API must be invoked exclusively from interrupt handlers.
*
* @special
*/
#define chSysLockFromIsr() { \
port_lock_from_isr(); \
dbg_check_lock_from_isr(); \
}
/**
* @brief Leaves the kernel lock mode from within an interrupt handler.
*
* @note This API may do nothing on some architectures, it is required
* because on ports that support preemptable interrupt handlers
* it is required to raise the interrupt mask to the same level of
* the system mutual exclusion zone.
* It is good practice to invoke this API after invoking any I-class
* syscall from an interrupt handler.
* @note This API must be invoked exclusively from interrupt handlers.
*
* @special
*/
#define chSysUnlockFromIsr() { \
dbg_check_unlock_from_isr(); \
port_unlock_from_isr(); \
}
/** @} */
/**
* @name ISRs abstraction macros
*/
/**
* @brief IRQ handler enter code.
* @note Usually IRQ handlers functions are also declared naked.
* @note On some architectures this macro can be empty.
*
* @special
*/
#define CH_IRQ_PROLOGUE() \
PORT_IRQ_PROLOGUE(); \
dbg_check_enter_isr();
/**
* @brief IRQ handler exit code.
* @note Usually IRQ handlers function are also declared naked.
* @note This macro usually performs the final reschedule by using
* @p chSchIsPreemptionRequired() and @p chSchDoReschedule().
*
* @special
*/
#define CH_IRQ_EPILOGUE() \
dbg_check_leave_isr(); \
PORT_IRQ_EPILOGUE();
/**
* @brief Standard normal IRQ handler declaration.
* @note @p id can be a function name or a vector number depending on the
* port implementation.
*
* @special
*/
#define CH_IRQ_HANDLER(id) PORT_IRQ_HANDLER(id)
/** @} */
/**
* @name Fast ISRs abstraction macros
*/
/**
* @brief Standard fast IRQ handler declaration.
* @note @p id can be a function name or a vector number depending on the
* port implementation.
* @note Not all architectures support fast interrupts.
*
* @special
*/
#define CH_FAST_IRQ_HANDLER(id) PORT_FAST_IRQ_HANDLER(id)
/** @} */
#ifdef __cplusplus
extern "C" {
#endif
void chSysInit(void);
void chSysTimerHandlerI(void);
#ifdef __cplusplus
}
#endif
#endif /* _CHSYS_H_ */
/** @} */