TheeCSDump: PSD_IRQ

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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PsdIrqMask

PSD_IRQ_MASK