PSD_IRQ_MASK

PSD_IRQ_MASK keywords

Optional, Default, Can't Block

Description
Mask/Unmask IRQ levels

This function allows masking (disabling), or un-masking (enabling) of IRQ levels. When this function is invoked it should save the state of the interrupt flag, and disable interrupts before performing the mask operation. It should then restore the state of the interrupt flag.

Mode
Called in Kernel, and Interrupt Mode.

Entry
Pointer to PSD_IRQ structure.

Exit

NO_ERROR

operation completed successfully.
-1
operation failed.
Structures

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

data

is the logical IRQ levels to mask, or un-mask.
flags
indicate which type of operation is to be performed.

IRQ_MASK

mask (disable) IRQ levels
IRQ_UNMASK
unmask (enable) IRQ levels
IRQ_GETMASK
retrieves the masks for all IRQ levels
IRQ_NEWMASK
indicates that all the IRQ levels should reflect the state of the specified mask.
procnum
is the processor number of where the operation should take place.
Notes
If this function is omitted, OS/2 will perform all mask 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.

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