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[pci] Save and restore PCI command register

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This seems to be necessary for some types of PCI devices. We had
problems when using gPXE in KVM virtual machines with direct
PCI device access.

Signed-off-by: Bernhard Kohl <bernhard.kohl@nsn.com>
Signed-off-by: Shao Miller <shao.miller@yrdsb.edu.on.ca>
Modified-by: Marty Connor <mdc@etherboot.org>
Signed-off-by: Marty Connor <mdc@etherboot.org>
This commit is contained in:
Bernhard Kohl 2010-01-21 18:13:48 -05:00 committed by Marty Connor
parent 93805d9765
commit 466d8fc234
1 changed files with 5 additions and 0 deletions
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5
src/drivers/bus/pciextra.c
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@ -60,8 +60,11 @@ int pci_find_capability ( struct pci_device *pci, int cap ) {
* 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 */
@ -70,6 +73,8 @@ unsigned long pci_bar_size ( struct pci_device *pci, unsigned int reg ) {
/* 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 {