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https://github.com/zephyrproject-rtos/zephyr
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f7fffae8aa
Change all the Intel and Wind River code license from BSD-3 to Apache 2. Change-Id: Id8be2c1c161a06ea8a0b9f38e17660e11dbb384b Signed-off-by: Javier B Perez Hernandez <javier.b.perez.hernandez@linux.intel.com> Signed-off-by: Anas Nashif <anas.nashif@intel.com> Signed-off-by: Allan Stephens <allan.stephens@windriver.com> Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
106 lines
3.2 KiB
C
106 lines
3.2 KiB
C
/* arc/v2/irq.h - ARCv2 public interrupt handling */
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/*
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* Copyright (c) 2014 Wind River Systems, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* DESCRIPTION
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* ARCv2 nanokernel interrupt handling interface. Included by ARC/v2/arch.h.
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*/
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#ifndef _ARCH_ARC_V2_IRQ__H_
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#define _ARCH_ARC_V2_IRQ__H_
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#include <arch/arc/v2/aux_regs.h>
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#include <toolchain/common.h>
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#ifdef _ASMLANGUAGE
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GTEXT(_irq_exit);
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GTEXT(irq_connect)
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GTEXT(irq_enable)
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GTEXT(irq_disable)
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#else
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extern int irq_connect(unsigned int irq,
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unsigned int prio,
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void (*isr)(void *arg),
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void *arg);
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extern void irq_enable(unsigned int irq);
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extern void irq_disable(unsigned int irq);
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extern void _irq_exit(void);
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/**
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*
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* @brief 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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* This function can be called recursively: it will return a key to return the
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* state of interrupt locking to the previous level.
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*
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* WARNINGS
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* Invoking a kernel 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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* thread executes, or while the system is idle.
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*
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* The "interrupt disable state" is an attribute of a thread. Thus, if a
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* fiber or task disables interrupts and subsequently invokes a kernel
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* routine that causes the calling thread to block, the interrupt
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* disable state will be restored when the thread is later rescheduled
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* for execution.
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*
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* @return 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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static ALWAYS_INLINE unsigned int irq_lock(void)
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{
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unsigned int key;
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__asm__ volatile("clri %0" : "=r"(key));
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return key;
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}
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/**
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*
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* @brief 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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* @return N/A
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*/
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static ALWAYS_INLINE void irq_unlock(unsigned int key)
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{
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__asm__ volatile("seti %0" : : "ir"(key));
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}
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#endif /* _ASMLANGUAGE */
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#endif /* _ARCH_ARC_V2_IRQ__H_ */
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