diff options
Diffstat (limited to 'bsps/i386/shared/irq/elcr.h')
-rw-r--r-- | bsps/i386/shared/irq/elcr.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/bsps/i386/shared/irq/elcr.h b/bsps/i386/shared/irq/elcr.h new file mode 100644 index 0000000000..a006d4f149 --- /dev/null +++ b/bsps/i386/shared/irq/elcr.h @@ -0,0 +1,37 @@ +/* + * Copyright 2016 Chris Johns <chrisj@rtems.org> + * + * Header for the FreeBSD ported elcr.c + */ + +#ifndef _IRQ_ELCR_H_ +#define _IRQ_ELCR_H_ + +#include <sys/cdefs.h> + +enum intr_trigger { + INTR_TRIGGER_EDGE, + INTR_TRIGGER_LEVEL +}; + +/* + * Check to see if we have what looks like a valid ELCR. We do this by + * verifying that IRQs 0, 1, 2, and 13 are all edge triggered. + */ +int elcr_probe(void); + +/* + * Returns 1 for level trigger, 0 for edge. + */ +enum intr_trigger elcr_read_trigger(u_int irq); + +/* + * Set the trigger mode for a specified IRQ. Mode of 0 means edge triggered, + * and a mode of 1 means level triggered. + */ +void elcr_write_trigger(u_int irq, enum intr_trigger trigger); + +void elcr_resume(void); + + +#endif |