HAL_PCISpecialCycle (changes)
Showing changes from revision #2 to #3:
Added | Removed | Changed
Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_PCISpecialCycle
HAL_PCISpecialCycle
(HAL entry #94)
void HAL_PCISpecialCycle(uint32_t message)
| Entry | |
|---|---|
| message | |
| b16-31 Message specific optional data |
| Exit | |
|---|---|
| - |
Use
Performs a special cycle on thePCI bus. bus 0, as defined in section 3.6.2 of thePCI 2.2 specification. The 32 bit sideband message value is placed on the bus during the data phase, and encodes a 16 bit message number plus optional 16 bit data value.
Special cycles cannot cross PCI bridges, a type 1 configuration write must be used in that instance, so this call only concerns bus 0.
This is an internal call for use by the PCI module and should not be used by user software. User software should use the PCI SWIs instead of talking to the HAL directly.
See also
Information source: HAL.Tungsten.doc.PCI_HALAPI in CVS
Social
Follow us on
and
and
ROOL Store
Buy RISC OS Open merchandise here, including SD cards for Raspberry Pi and more.