/** * DOC: GuC MMIO based communication * * The MMIO based communication between Host and GuC relies on special * hardware registers which format could be defined by the software * (so called scratch registers). * * Each MMIO based message, both Host to GuC (H2G) and GuC to Host (G2H) * messages, which maximum length depends on number of available scratch * registers, is directly written into those scratch registers. * * For Gen9+, there are 16 software scratch registers 0xC180-0xC1B8, * but no H2G command takes more than 4 parameters and the GuC firmware * itself uses an 4-element array to store the H2G message. * * For Gen11+, there are additional 4 registers 0x190240-0x19024C, which * are, regardless on lower count, preferred over legacy ones. * * The MMIO based communication is mainly used during driver initialization * phase to setup the `CTB based communication`_ that will be used afterwards.
*/
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