Altera Embedded Peripherals IP - Manual (Page 286)

VIC BSP Settings
The VIC driver scripts provide settings to the BSP. The number and naming of these settings depends on
your hardware system's configuration, specifically, the number of optional shadow register sets in the
Nios II processor, the number of VIC controllers in the system, and the number of interrupt ports each
VIC has.
Certain settings apply to all VIC instances in the system, while others apply to a specific VIC instance.
Settings that apply to each interrupt port apply only to the specified interrupt port number on that VIC
instance.
The remainder of this section lists details and descriptions of each VIC BSP setting.
altera_vic_driver.enable_preemption
Identifier: ALTERA_VIC_DRIVER_ISR_PREEMPTION_ENABLED
Type:
BooleanDefineOnly
Default
value:
1 when all components connected to the VICs support
preemption. 0 when any of the connected components don’t
support preemption.
Destina‐
tion file:
system.h
Descrip‐
tion:
Enables global interrupt preemption (nesting). When enabled
(set to 1), the macro
ALTERA_VIC_DRIVER_ISR_PREEMPTION_
ENABLED
is defined in system.h .
Two types of ISR preemption are available. This setting must be
enabled along with other settings to enable specific types of
preemption.
All preemption settings are dependant on whether the device
drivers in your BSP support interrupt preemption. For more
information about preemption, refer to the Exception Handling
chapter of the Nios II Software Developer’s Handbook.
Occurs: Once per VIC
altera_vic_driver.enable_preemption_into_new_register_set
Identifier: ALTERA_VIC_DRIVER_PREEMPTION_INTO_NEW_
REGISTER_SET_ENABLED
Type: BooleanDefineOnly
Default
value:
0
Destina‐
tion file:
system.h
UG-01085
2014.24.07
altera_vic_driver.enable_preemption 28-17
Vectored Interrupt Controller Core Altera Corporation
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