/**
* Read from PCI config space.
* @param bdf 16-bit bus/device/function ID of target.
* @param address Config space access address.
* @param size Access size (1, 2 or 4 bytes).
*
* @return Read value.
*
* @see pci_write_config
*/
u32 pci_read_config(u16 bdf, u16 address, unsigned int size)
{
void *mmcfg_addr = pci_get_device_mmcfg_base(bdf) + address;
if (!pci_space || PCI_BUS(bdf) > end_bus)
return arch_pci_read_config(bdf, address, size);
if (size == 1)
return mmio_read8(mmcfg_addr);
else if (size == 2)
return mmio_read16(mmcfg_addr);
else
return mmio_read32(mmcfg_addr);
}
/**
* Handler for IN accesses to data port.
* @param guest_regs Guest register set.
* @param device Structure describing PCI device.
* @param address Config space access address.
* @param size Access size (1, 2 or 4 bytes).
*
* @return 1 if handled successfully, -1 on access error.
*
* @private
*/
static int
data_port_in_handler(struct registers *guest_regs, struct pci_device *device,
u16 address, unsigned int size)
{
u32 reg_data;
if (pci_cfg_read_moderate(device, address,
size, ®_data) == PCI_ACCESS_PERFORM)
reg_data = arch_pci_read_config(device->info->bdf, address,
size);
set_rax_reg(guest_regs, reg_data, size);
return 1;
}