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