nuttx/arch/sim/include/irq.h

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/****************************************************************************
2016-08-07 02:16:31 +02:00
* arch/sim/include/irq.h
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/* This file should never be included directly but, rather,
* only indirectly through nuttx/irq.h
*/
#ifndef __ARCH_SIM_INCLUDE_IRQ_H
#define __ARCH_SIM_INCLUDE_IRQ_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <arch/setjmp.h>
#include <sys/types.h>
#ifndef __ASSEMBLY__
# include <stdbool.h>
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define NR_IRQS 64
/****************************************************************************
* Public Types
****************************************************************************/
#ifndef __ASSEMBLY__
/* This struct defines the way the registers are stored */
struct xcptcontext
{
void *sigdeliver; /* Actual type is sig_deliver_t */
jmp_buf regs;
};
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/****************************************************************************
* Public Data
****************************************************************************/
/* g_current_regs[] holds a references to the current interrupt level
* register storage structure. If is non-NULL only during interrupt
* processing. Access to g_current_regs[] must be through the macro
* CURRENT_REGS for portability.
*/
/* For the case of architectures with multiple CPUs, then there must be one
* such value for each processor that can receive an interrupt.
*/
EXTERN volatile void *g_current_regs[CONFIG_SMP_NCPUS];
#define CURRENT_REGS (g_current_regs[up_cpu_index()])
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: up_cpu_index
*
* Description:
* Return an index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
* corresponds to the currently executing CPU.
*
* Input Parameters:
* None
*
* Returned Value:
* An integer index in the range of 0 through (CONFIG_SMP_NCPUS-1) that
* corresponds to the currently executing CPU.
*
****************************************************************************/
#ifdef CONFIG_SMP
int up_cpu_index(void);
#else
# define up_cpu_index() (0)
#endif
/* Name: up_irq_save, up_irq_restore, and friends.
*
* NOTE: These functions should never be called from application code and,
* as a general rule unless you really know what you are doing, this
* function should not be called directly from operation system code either:
* Typically, the wrapper functions, enter_critical_section() and
* leave_critical section(), are probably what you really want.
*/
irqstate_t up_irq_flags(void);
irqstate_t up_irq_save(void);
void up_irq_restore(irqstate_t flags);
/****************************************************************************
* Inline functions
****************************************************************************/
/* Return the current value of the stack pointer */
static inline uintptr_t up_getsp(void)
{
#ifdef _MSC_VER
uintptr_t regval;
__asm mov regval, esp;
return regval;
#else
return (uintptr_t)__builtin_frame_address(0);
#endif
}
/****************************************************************************
* Name: up_interrupt_context
*
* Description:
* Return true is we are currently executing in the interrupt
* handler context.
*
****************************************************************************/
static inline bool up_interrupt_context(void)
{
#ifdef CONFIG_SMP
irqstate_t flags = up_irq_save();
#endif
bool ret = CURRENT_REGS != NULL;
#ifdef CONFIG_SMP
up_irq_restore(flags);
#endif
return ret;
}
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* !__ASSEMBLY__ */
#endif /* __ARCH_SIM_INCLUDE_IRQ_H */