* function.
*/
unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg ) {
+ uint16_t cmd;
uint32_t start, size;
+ /* Save the original command register */
+ pci_read_config_word ( pci, PCI_COMMAND, &cmd );
/* Save the original bar */
pci_read_config_dword ( pci, reg, &start );
/* Compute which bits can be set */
/* Restore the original size */
pci_write_config_dword ( pci, reg, start );
/* Find the significant bits */
+ /* Restore the original command register. This reenables decoding. */
+ pci_write_config_word ( pci, PCI_COMMAND, cmd );
if ( start & PCI_BASE_ADDRESS_SPACE_IO ) {
size &= PCI_BASE_ADDRESS_IO_MASK;
} else {