PSD_IRQ_REG

Access IRQ related registers.

This function permits access to the IRQ related registers.

Mode: Called in Kernel, and Interrupt Mode.

Syntax

PSD_IRQ_REG <keywords>

Parameters

Entry: Pointer to PSD_IRQ structure.

  ulong_t flags;    (Input)
  ulong_t data;     (Input/Output)
  ulong_t procnum;  (Input)

flags

indicate which type of operation is to be performed.

IRQ_READ_IRR read the interrupt request register.

IRQ_READ_ISR read the in service register.

data: contains the data read from a read request, or the data to write if a write request.
procnum: is the processor number of where the operation should take place.

Return Code

NO_ERROR: operation completed successfully.
-1: operation failed.

Remarks

Optional: the function is not required.
The OS/2 kernel provides default handling for that specific function.
The function can not call a PSD help that may block.

Notes : If this function is omitted, OS/2 will perform all register operations for an 8259 Master/Slave based PIC system. The requests will be sent to CPU0 depending on the state of the INIT_GLOBAL_IRQ_ACCESS flag.

Structure

typedef struct psd_irq_s {
   ulong_t flags;    (Input)
   ulong_t data;     (Input/Output)
   ulong_t procnum;  (Input)
} PSD_IRQ;