ddi_intr_get_hilevel_pri(9f) [sunos man page]

ddi_intr_get_hilevel_pri(9F)											      ddi_intr_get_hilevel_pri(9F)

NAME

       ddi_intr_get_hilevel_pri - get minimum priority level for a high-level interrupt

SYNOPSIS

       #include <sys/types.h>
       #include <sys/conf.h>
       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       int ddi_intr_get_hilevel_pri(void);

INTERFACE LEVEL

       Solaris DDI specific (Solaris DDI).

       Upon a successful return, the ddi_intr_get_hilevel_pri() function returns the minimum priority level for a high-level interrupt. The return
       priority value can be used to compare to other priority values, such as those returned from ddi_intr_get_pri(9F), to determine if  a  given
       interrupt priority is a high-level interrupt.

       High-level  interrupts  must be handled without using system services that manipulate thread or process states, because such interrupts are
       not blocked by the scheduler.

       In addition, high-level interrupt handlers must take care to do a minimum of work because they cannot be preempted.

       A typical high-level interrupt handler puts data into a circular buffer and schedule a soft  interrupt  by  calling  ddi_intr_trigger_soft-
       int(). The circular buffer can be protected by using a mutex that is properly initialized for the interrupt handler.

       The ddi_intr_get_hilevel_pri() function can be used before calling ddi_intr_add_handler() to help determine which type of interrupt handler
       can be used. Most device drivers are designed with the knowledge that supported devices always generate	low  level  interrupts.   On  some
       machines,  however,  interrupts	are  high-level  above the scheduler level and on other machines they are not. Devices such as those those
       using SBus interrupts or VME bus level 6 or 7 interrupts must use the ddi_intr_get_hilevel_pri() function to test  the  type  of  interrupt
       handler that can be used.

       The ddi_intr_get_hilevel_pri() function returns the priority value for a high-level interrupt.

CONTEXT

       The ddi_intr_get_hilevel_pri() function can be called from either user or kernel non-interrupt context.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       attributes(5),	ddi_intr_add_handler(9F),  ddi_intr_alloc(9F),	ddi_intr_enable(9F),  ddi_intr_get_pri(9F),  ddi_intr_trigger_softint(9F),
       mutex(9F)

								    07 Apr 2005 				      ddi_intr_get_hilevel_pri(9F)

Check Out this Related Man Page

ddi_intr_hilevel(9F)					   Kernel Functions for Drivers 				      ddi_intr_hilevel(9F)

NAME

       ddi_intr_hilevel - indicate interrupt handler type

SYNOPSIS

       #include <sys/ddi.h>
       #include <sys/sunddi.h>

       int ddi_intr_hilevel(dev_info_t *dip, uint_t inumber);

INTERFACE LEVEL

       Solaris	DDI specific (Solaris DDI). This interface is obsolete. Use the new interrupt interfaces referenced in Intro(9F). Refer to Writing
       Device Drivers for more information.

PARAMETERS

       dip	  Pointer to dev_info structure.

       inumber	  Interrupt number.

DESCRIPTION

       The ddi_intr_hilevel() function returns non-zero if the specified interrupt is a "high level" interrupt.

       High level interrupts must be handled without using system services that manipulate thread or process states, because these interrupts  are
       not blocked by the scheduler.

       In addition, high level interrupt handlers must take care to do a minimum of work because they are not preemptable.

       A  typical  high  level	interrupt handler would put data into a circular buffer and schedule a soft interrupt by calling ddi_trigger_soft-
       intr(). The circular buffer could be protected by using a mutex that was properly initialized for the interrupt handler.

       The ddi_intr_hilevel() function can be used before calling ddi_add_intr() to decide which type of interrupt handler should  be  used.  Most
       device  drivers	are  designed  with  the  knowledge  that the devices they support will always generate low level interrupts, however some
       devices, for example those using SBus or VME bus level 6 or 7 interrupts must use this test because on some machines those  interrupts  are
       high level (above the scheduler level) and on other machines they are not.

RETURN VALUES

       non-zero    indicates a high-level interrupt.

CONTEXT

       These functions can be called from useruser, interrupt, or kernel context.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Obsolete			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       ddi_add_intr(9F), Intro(9F), mutex(9F)

       Writing Device Drivers

SunOS 5.11							    16 Jan 2006 					      ddi_intr_hilevel(9F)

Linux and UNIX Man Pages

ddi_intr_get_hilevel_pri(9f) [sunos man page]

Check Out this Related Man Page