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31 #include <sys/ioctl.h>
33 static inline uint64_t
34 gen_canonical_address(uint64_t v
)
36 /* From the Broadwell PRM Vol. 2a, MI_LOAD_REGISTER_MEM::MemoryAddress:
38 * "This field specifies the address of the memory location where the
39 * register value specified in the DWord above will read from. The
40 * address specifies the DWord location of the data. Range =
41 * GraphicsVirtualAddress[63:2] for a DWord register GraphicsAddress
42 * [63:48] are ignored by the HW and assumed to be in correct
43 * canonical form [63:48] == [47]."
45 const int shift
= 63 - 47;
46 return (int64_t)(v
<< shift
) >> shift
;
50 * This returns a 48-bit address with the high 16 bits zeroed.
52 * It's the opposite of gen_canonicalize_address.
54 static inline uint64_t
55 gen_48b_address(uint64_t v
)
57 const int shift
= 63 - 47;
58 return (uint64_t)(v
<< shift
) >> shift
;
62 * Call ioctl, restarting if it is interupted
65 gen_ioctl(int fd
, unsigned long request
, void *arg
)
70 ret
= ioctl(fd
, request
, arg
);
71 } while (ret
== -1 && (errno
== EINTR
|| errno
== EAGAIN
));
75 bool gen_gem_supports_syncobj_wait(int fd
);
77 #endif /* GEN_GEM_H */