diff options
Diffstat (limited to 'nuttx/arch/arm/src/armv7-m/up_doirq.c')
-rw-r--r-- | nuttx/arch/arm/src/armv7-m/up_doirq.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/armv7-m/up_doirq.c b/nuttx/arch/arm/src/armv7-m/up_doirq.c new file mode 100644 index 000000000..7ac1ec34d --- /dev/null +++ b/nuttx/arch/arm/src/armv7-m/up_doirq.c @@ -0,0 +1,123 @@ +/**************************************************************************** + * arch/arm/src/armv7-m/up_doirq.c + * + * Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * 3. Neither the name NuttX nor the names of its contributors may be + * used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS + * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED + * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + * POSSIBILITY OF SUCH DAMAGE. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> + +#include <stdint.h> +#include <assert.h> + +#include <nuttx/irq.h> +#include <nuttx/arch.h> +#include <arch/board/board.h> + +#include "up_arch.h" +#include "os_internal.h" +#include "up_internal.h" + +/**************************************************************************** + * Pre-processor Definitions + ****************************************************************************/ + +/**************************************************************************** + * Public Data + ****************************************************************************/ + +/**************************************************************************** + * Private Data + ****************************************************************************/ + +/**************************************************************************** + * Private Functions + ****************************************************************************/ + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +uint32_t *up_doirq(int irq, uint32_t *regs) +{ + up_ledon(LED_INIRQ); +#ifdef CONFIG_SUPPRESS_INTERRUPTS + PANIC(OSERR_ERREXCEPTION); +#else + uint32_t *savestate; + + /* Nested interrupts are not supported in this implementation. If you want + * implemented nested interrupts, you would have to (1) change the way that + * current regs is handled and (2) the design associated with + * CONFIG_ARCH_INTERRUPTSTACK. + */ + + /* Current regs non-zero indicates that we are processing an interrupt; + * current_regs is also used to manage interrupt level context switches. + */ + + savestate = (uint32_t*)current_regs; + current_regs = regs; + + /* Mask and acknowledge the interrupt */ + + up_maskack_irq(irq); + + /* Deliver the IRQ */ + + irq_dispatch(irq, regs); + + /* If a context switch occurred while processing the interrupt then + * current_regs may have change value. If we return any value different + * from the input regs, then the lower level will know that a context + * switch occurred during interrupt processing. + */ + + regs = (uint32_t*)current_regs; + + /* Restore the previous value of current_regs. NULL would indicate that + * we are no longer in an interrupt handler. It will be non-NULL if we + * are returning from a nested interrupt. + */ + + current_regs = savestate; + + /* Unmask the last interrupt (global interrupts are still disabled) */ + + up_enable_irq(irq); +#endif + up_ledoff(LED_INIRQ); + return regs; +} |