HAL_FIQSource (changes)
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Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_FIQSource
HAL_FIQSource
(HAL entry #10)
int HAL_FIQSource(void)
| Entry | |
|---|---|
| - |
| Exit | |
|---|---|
| >= 0 | Device number that is the source of the current FIQ |
| -1 | No device is currently interrupting (indicates spurious interrupt) |
Use
On receipt of an FIQ, the kernel will call this function to determine what device/shared interrupt line is the cause. If -1 is returned, the kernel perform no further action and return to running user code. Otherwise the kernel will invoke the appropriate interrupt handler, or mask the interrupt via HAL_FIQDisable if no such handler exists.
Note: Currently, the number of supported devices is fixed for each kernel version.
See also
Information sources: Kernel.Docs.HAL.MoreEnts, HAL.Tungsten.s.Interrupts, HAL.OMAP3.s.Interrupts in CVS
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