A fast and easily customised operating system
for ARM devices
HAL_PCIAddresses
Hardware Abstraction Layer
HAL entry points from RISC OS
ยป HAL_PCIAddresses
HAL_PCIAddresses
(HAL entry #96)
int HAL_PCIAddresses(pcimem *buffer, int bufsize)
| Entry | |
|---|---|
| buffer | Buffer pointer |
| bufsize | Size of buffer |
| Exit | |
|---|---|
| - | Returns number of bytes written to buffer |
Use
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.
This call reads information about the PCI address space.
struct pcimem
{
int32_t mem_to_phys_offset; // Number to add to PCI memory address to get ARM physical address
int32_t mem_lowest; // Lowest PCI memory address available for allocation
int32_t mem_highest; // Highest (inclusive) PCI memory address avaialable for allocation
int32_t io_to_phys_offset; // Number to add to PCI I/O address to get ARM physical address
int32_t io_lowest; // Lowest PCI memory address available for allocation
int32_t io_highest; // Highest (inclusive) PCI memory address available for allocation
int32_t ram_to_pci_mem_offst; // Value to add to physical RAM address to get PCI memory address
}