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OPAL_PCI_MAP_PE_DMA_WINDOW_REAL
===============================
::
#define OPAL_PCI_MAP_PE_DMA_WINDOW_REAL 45
**WARNING:** following documentation is from old sources, and is possibly
not representative of OPALv3 as implemented by skiboot. This should be
used as a starting point for full documentation.
The host calls this function to initialize the specified DMA window for
untranslated DMA addresses. This allows a PE to DMA directly to system memory
without TCE translation. The DMA window PCI memory address is equal to the
system memory real address. The PHB passes PCI address bits 04:63 directly to
system real address bits 04:63 when PCI address bits 04:39 are within the
region specified by mem_addr t0 mem_addr + window_size.
The addresses must be 16MB aligned and a multiple of 16MB in size.
``phb_id``
is the value from the PHB node ibm,opal-phbid property.
``dma_window_number``
specifies the DMA window
For ibm,opal-ioda PHBs the dma_window_number is an index from 0 to the PHB
total number of windows minus 1. For ibm,opal-ioda2 PHBs the DMA window_number
is an index from 0 to n-1, where n is the number of windows per window set,
within the window set associated with the specified PE number.
``pe_number``
is the index of the PE that is authorized to DMA to this window
address space in PCI memory,
``mem_addr``
is the starting 64-bit system real address mapped directly to the
starting address in PCI memory. Addresses below 4GB are zero in bits above
bit 32. This value must be aligned on a 16MB boundary; OPAL returns
OPAL_PARAMETER for any value that is not a multiple of 16MB.
``window_size``
is the size, in bytes, of the address range defined by this
window. This value must be a multiple of 16MB; OPAL returns OPAL_PARAMETER
for any value that is not a multiple of 16MB. A value of '0' indicates to
disable this DMA window.
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