UNDI will pass the virtual address of a buffer, direction of the data
flow from/to the mapped buffer (the constants are defined below)
and a place holder (pointer) for the mapped address.
This call will Map the given address to a physical DMA address and write
the result to the mapped_addr pointer. If there is no need to
map the given address to a lower address (i.e. the given address is
associated with a physical address that is already compatible to be
used with the DMA, it converts the given virtual address to it's
physical address and write that in the mapped address pointer.
This field can be set to zero if there is no mapping service available.
PXE_VOID Map_Mem(UINT64 unq_id, UINT64 virtual_addr, UINT32 size, UINT32 Direction, UINT64 mapped_addr);
UNDI will pass the virtual address of a buffer, direction of the data flow from/to the mapped buffer (the constants are defined below) and a place holder (pointer) for the mapped address. This call will Map the given address to a physical DMA address and write the result to the mapped_addr pointer. If there is no need to map the given address to a lower address (i.e. the given address is associated with a physical address that is already compatible to be used with the DMA, it converts the given virtual address to it's physical address and write that in the mapped address pointer.
This field can be set to zero if there is no mapping service available.