PCISPACE structure

Describes an extended (64-bit) address space from a pair of BARs. Used by the call PciGetExtendedAddressSpace.

typedef struct {
        QWORD start;
        QWORD size;
        DWORD flags;
} PCISPACE;

The fields are defined as follows:

start The base physical address of the space described by the BAR pair. The type of space (memory or I/O) is indicated in the flags field.

size The size of the address space indicated by the BAR pair.

flags

A mask which indicates the type and capabilities of the corresponding BAR. This may contain one or more of the following flags:

`IOSPACE_IO`	The space described resides in I/O space.
`IOSPACE_MEM`	The space described resides in memory space.
`IOSPACE_PREFETCH`	The memory space described is pre-fetchable (see the PCI specification for details).
`IOSPACE_READONLY`	The memory space described is not writable.
`IOSPACE_CACHEABLE`	The memory space described is cacheable.
`IOSPACE_64BIT`	The memory space described is a 64-bit space.
`IOSPACE_BAR_INDEX_MASK`	A subfield containing the index of the original BAR for this space.