This patch adds support for PCI BAR1 and also changes
the pci_init(), instead of having one function for each `bar`
we now set the `bar` to pci_config_addr_t parameter before calling
the pci_init() function..
This patch adds the 'meta' field to the generic driver structure to
point to optional driver-defined metadata. It also modifies the
associated initialization routine to populate it and updates the 16X50
UART driver to use the new initialization routine signature. This
patch also adds a function to perform PCI configuration register
writes, definitions for the PCI Command configuration register address
and some of the bits in that register, and a function to set
additional bits in that register. Finally, it adds macros to help
with performing MMIO to and from PCI devices.
This patch adds a driver for an MMIO-accessible 16X50 UART. It
assumes that the boot firmware assigned an MMIO range to the UART. It
operates in polled mode with FIFOs enabled.
