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i8259x2

Provided by

8259x2

Class Hierarchy

conf-object → log-object → i8259x2

Interfaces Implemented

log_object, event_poster, interrupt_cpu, simple_interrupt, io_memory

Description

The 8259x2 device implements the functionality of two cascaded 8259 interrupt controllers. The 8259x2 supplies 15 interrupt levels that connected devices can use to interrupt the cpu. The interrupt level to use should be set in the interrupting device. Limitations: Most registers in the 8259x2 device change hardware specific parameters. These are do-nothing in the 8259x2. Special Fully Nested Mode is not implemented. Buffered Mode is not implemented. Special Mask Mode is not implemented. Automatic End of Interrupt is not implemented. Rotate commands are not supported. Specific EOI commands are not supported.

Attributes

Attributes inherited from class conf-object

attributes, classname, component, iface, name, object_id, queue

Attributes inherited from class log-object

access_count, log_buffer, log_buffer_last, log_buffer_size, log_group_mask, log_groups, log_level, log_type_mask

Attribute List

aeoi

Optional attribute; read/write access; type: [ii].

(dev1,dev2) auto end of interrupt mode.

ic4_set

Optional attribute; read/write access; type: [ii].

(dev1,dev2) expect 4 init bytes.

init_seq

Optional attribute; read/write access; type: [ii].

(dev1,dev2) sequence in initialization writes.

irq_dev

Required attribute; read/write access; type: Object.

Interrupt device to use, implementing the 'interrupt-ack' interface.

irq_mask

Optional attribute; read/write access; type: [ii].

(dev1,dev2) interrupt mask.

irq_requested

Optional attribute; read/write access; type: Integer.

Interrupt of the cpu is requested.

issued

Optional attribute; read/write access; type: [ii].

(dev1,dev2) bit set for interrupt sent (and acked) to cpu (ISR).

level

Optional attribute; read/write access; type: [ii].

(dev1,dev2) bit set for level triggered, else edge.

line_status

Optional attribute; read/write access; type: [ii].

(dev1,dev2) interrupt input line status.

low_irq_pri

Optional attribute; read/write access; type: [ii].

(dev1,dev2) interrupt with lowest priority.

poll

Optional attribute; read/write access; type: [ii].

(dev1,dev2) poll command.

queued

Optional attribute; read/write access; type: [ii].

(dev1,dev2) bit set for interrupts received from device in level triggered mode. Used to handle re-issuing of level triggered interrupts. This bit is NOT used for the cascade line.

read_reg

Optional attribute; read/write access; type: [ii].

(dev1,dev2) IRR or ISR on next read.

reissue_pending

Optional attribute; read/write access; type: Integer.

Interrupt reissue event posted to CPU.

request

Optional attribute; read/write access; type: [ii].

(dev1,dev2) interrupt requested (IRR).

sfnm

Optional attribute; read/write access; type: [ii].

(dev1,dev2) special fully nested mode.

special_mask

Optional attribute; read/write access; type: [ii].

(dev1,dev2) special mask mode is set (may allow lower irq when ISR set).

vba

Optional attribute; read/write access; type: [ii].

(dev1,dev2) Interrupt Vector Base Address.

Command List

Commands defined by interface log_object

log, log-group, log-level, log-size, log-type

Commands

info	print information about the device
status	print status of the device

Command Descriptions

<i8259x2>.info

Synopsis

<i8259x2>.info

Description

Print detailed information about the configuration of the device.

<i8259x2>.status

Synopsis

<i8259x2>.status

Description

Print detailed information about the current status of the device.

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