Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

ddi_intr_hilevel(9f) [opensolaris 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 This interface is obsolete.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)

Check Out this Related 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)

Featured Tech Videos