diff options
Diffstat (limited to 'nuttx/arch/pjrc-8051/src/up_irq.c')
-rw-r--r-- | nuttx/arch/pjrc-8051/src/up_irq.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/nuttx/arch/pjrc-8051/src/up_irq.c b/nuttx/arch/pjrc-8051/src/up_irq.c new file mode 100644 index 000000000..c524fe3e7 --- /dev/null +++ b/nuttx/arch/pjrc-8051/src/up_irq.c @@ -0,0 +1,157 @@ +/************************************************************ + * up_irq.c + * + * Copyright (C) 2007 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 Gregory Nutt 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 <sys/types.h> +#include <nuttx/irq.h> +#include "up_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +/************************************************************ + * Public Data + ************************************************************/ + +/************************************************************ + * Private Data + ************************************************************/ + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Public Funtions + ************************************************************/ + +/************************************************************ + * Name: irq_initialize + ************************************************************/ + +void up_irqinitialize(void) +{ +} + +/************************************************************ + * Name: irqsave + * + * Description: + * Disable all IRQs + * + ************************************************************/ + +irqstate_t irqsave(void) _naked +{ + _asm + mov ie, dpl + clr ea + ret + _endasm; +} + +/************************************************************ + * Name: irqrestore + * + * Description: + * Restore a previous interrupt state + * + ************************************************************/ + +void irqrestore(irqstate_t flags) __naked +{ + flags; /* Avoid compiler warning about unused argument */ + _asm + mov ie, dpl + ret + _endasm; +} + +/************************************************************ + * Name: up_disable_irq + * + * Description: + * Disable the IRQ specified by 'irq' + * + ************************************************************/ + +static void _up_disable_irq(ubyte iebit) __naked +{ + _asm + mov a, ie + orl a, dpl + mov ie, a + ret + _endasm; +} + +void up_disable_irq(int irq) +{ + if ((unsigned)irq < NR_IRQS) + { + _up_disable_irq(1 << irq); + } +} + +/************************************************************ + * Name: up_enable_irq + * + * Description: + * Enable the IRQ specified by 'irq' + * + ************************************************************/ + +static void _up_enable_irq(ubyte iebit) __naked +{ + _asm + mov a, ie + anl a, dpl + mov ie, a + ret + _endasm; +} + +void up_enable_irq(int irq) +{ + if ((unsigned)irq < NR_IRQS) + { + _up_enable_irq(~(1 << irq)); + } +} |