/**
* Write to PCI config space.
* @param bdf 16-bit bus/device/function ID of target.
* @param address Config space access address.
* @param value Value to be written.
* @param size Access size (1, 2 or 4 bytes).
*
* @see pci_read_config
*/
void pci_write_config(u16 bdf, u16 address, u32 value, unsigned int size)
{
void *mmcfg_addr = pci_get_device_mmcfg_base(bdf) + address;
if (!pci_space || PCI_BUS(bdf) > end_bus)
return arch_pci_write_config(bdf, address, value, size);
if (size == 1)
mmio_write8(mmcfg_addr, value);
else if (size == 2)
mmio_write16(mmcfg_addr, value);
else
mmio_write32(mmcfg_addr, value);
}
/**
* Handler for OUT 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_out_handler(struct registers *guest_regs, struct pci_device *device,
u16 address, unsigned int size)
{
u32 reg_data = get_rax_reg(guest_regs, size);
enum pci_access access;
access = pci_cfg_write_moderate(device, address, size, reg_data);
if (access == PCI_ACCESS_REJECT)
return -1;
if (access == PCI_ACCESS_PERFORM)
arch_pci_write_config(device->info->bdf, address, reg_data,
size);
return 1;
}