fc48d54386bd80eb56e831c7803dbac2f6293d6c
2 * Copyright © 2018 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
30 #include <sys/ioctl.h>
32 static inline uint64_t
33 gen_canonical_address(uint64_t v
)
35 /* From the Broadwell PRM Vol. 2a, MI_LOAD_REGISTER_MEM::MemoryAddress:
37 * "This field specifies the address of the memory location where the
38 * register value specified in the DWord above will read from. The
39 * address specifies the DWord location of the data. Range =
40 * GraphicsVirtualAddress[63:2] for a DWord register GraphicsAddress
41 * [63:48] are ignored by the HW and assumed to be in correct
42 * canonical form [63:48] == [47]."
44 const int shift
= 63 - 47;
45 return (int64_t)(v
<< shift
) >> shift
;
49 * This returns a 48-bit address with the high 16 bits zeroed.
51 * It's the opposite of gen_canonicalize_address.
53 static inline uint64_t
54 gen_48b_address(uint64_t v
)
56 const int shift
= 63 - 47;
57 return (uint64_t)(v
<< shift
) >> shift
;
61 * Call ioctl, restarting if it is interupted
64 gen_ioctl(int fd
, unsigned long request
, void *arg
)
69 ret
= ioctl(fd
, request
, arg
);
70 } while (ret
== -1 && (errno
== EINTR
|| errno
== EAGAIN
));
74 #endif /* GEN_GEM_H */