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stub: Do a single PCI read to get the vendor and device ID

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This commit is contained in:
Daan De Meyer
2026-04-02 14:58:42 +02:00
committed by Daan De Meyer
parent f9339b9087
commit 1653ac8db5
1 changed files with 5 additions and 6 deletions
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src/boot/stub.c
+5 -6
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@@ -1276,15 +1276,14 @@ static bool has_virtio_console_pci_device(void) {
if (BS->HandleProtocol(handles[i], MAKE_GUID_PTR(EFI_PCI_IO_PROTOCOL), (void **) &pci_io) != EFI_SUCCESS)
continue;
uint16_t vendor_id = 0, device_id = 0;
if (pci_io->Pci.Read(pci_io, EfiPciIoWidthUint16, 0x00, 1, &vendor_id) != EFI_SUCCESS)
continue;
if (pci_io->Pci.Read(pci_io, EfiPciIoWidthUint16, 0x02, 1, &device_id) != EFI_SUCCESS)
/* Read PCI vendor ID and device ID (at offsets 0x00 and 0x02 in PCI config space) */
uint16_t pci_id[2] = {};
if (pci_io->Pci.Read(pci_io, EfiPciIoWidthUint16, /* offset= */ 0x00, /* count= */ 2, pci_id) != EFI_SUCCESS)
continue;
log_debug("PCI device %zu: vendor=%04x device=%04x", i, vendor_id, device_id);
log_debug("PCI device %zu: vendor=%04x device=%04x", i, pci_id[0], pci_id[1]);
if (vendor_id == PCI_VENDOR_ID_REDHAT && device_id == PCI_DEVICE_ID_VIRTIO_CONSOLE)
if (pci_id[0] == PCI_VENDOR_ID_REDHAT && pci_id[1] == PCI_DEVICE_ID_VIRTIO_CONSOLE)
n_virtio_console++;
if (n_virtio_console > 1) {