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HAL_ControllerAddress
Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_ControllerAddress
HAL_ControllerAddress
(HAL entry #60)
void *HAL_ControllerAddress(unsigned ignored,unsigned controller)
| Entry | |
|---|---|
| ignored | This parameter is ignored |
| controller | See OS_Memory 9 Controller Numbers |
| Exit | |
|---|---|
| - | On success, returns the logical address of the chosen controller. |
| On failure, returns -1 (controller number not recognised) or zero (controller not present) |
Use
Asks the HAL where various controllers might or might not be. Podule manager uses this information to determine at run time whether or not to bother doing anything. The ADFS, SerialDeviceDriver & ParallelDeviceDriver modules use it to get the 82C710 address for providing floppy/serial/parallel support.
This HAL call is used in the implementation of SWI OS_Memory 9. User software should always prefer to use that SWI call instead of calling the HAL directly. OS_Memory 9 will convert a return value of -1 to an error, while a value of 0 will be returned directly.