98 lines
3.6 KiB
ArmAsm
98 lines
3.6 KiB
ArmAsm
/* irq_lock.s - interrupt locking */
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/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _IRQ_LOCK__H_
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#define _IRQ_LOCK__H_
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#define _ASMLANGUAGE
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#include <nanok.h>
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#include <offsets.h>
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#include <toolchain.h>
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#include <nanokernel/cpu.h>
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/*******************************************************************************
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*
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* irq_lock - disable all interrupts on the local CPU
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*
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* This routine disables interrupts. It can be called from either interrupt,
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* task or fiber level. This routine returns an architecture-dependent
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* lock-out key representing the "interrupt disable state" prior to the call;
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* this key can be passed to irq_unlock() to re-enable interrupts.
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*
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* The lock-out key should only be used as the argument to the
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* irq_unlock() API. It should never be used to manually re-enable
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* interrupts or to inspect or manipulate the contents of the source register.
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*
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* WARNINGS
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* Invoking a VxMicro routine with interrupts locked may result in
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* interrupts being re-enabled for an unspecified period of time. If the
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* called routine blocks, interrupts will be re-enabled while another
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* context executes, or while the system is idle.
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*
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* The "interrupt disable state" is an attribute of a context. Thus, if a
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* fiber or task disables interrupts and subsequently invokes a VxMicro
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* system routine that causes the calling context to block, the interrupt
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* disable state will be restored when the context is later rescheduled
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* for execution.
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*
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* RETURNS: An architecture-dependent lock-out key representing the
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* "interrupt disable state" prior to the call.
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*
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* \NOMANUAL
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*/
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SECTION_FUNC(TEXT, irq_lock)
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j_s.d [blink]
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clri r0
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/*******************************************************************************
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*
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* irq_unlock - enable all interrupts on the local CPU
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*
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* This routine re-enables interrupts on the local CPU. The <key> parameter
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* is an architecture-dependent lock-out key that is returned by a previous
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* invocation of irq_lock().
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*
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* This routine can be called from either interrupt, task or fiber level.
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*
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* RETURNS: N/A
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*
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* \NOMANUAL
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*/
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SECTION_FUNC(TEXT, irq_unlock)
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j_s.d [blink]
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seti r0
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#endif /* _IRQ_LOCK__H_ */
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