74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* SPDX-FileCopyrightText: Copyright (c) 2015 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: MIT
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#if !defined(NVKMS_IOCTL_H)
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#define NVKMS_IOCTL_H
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#include "nvtypes.h"
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/*!
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* Some of the NVKMS ioctl parameter data structures are quite large
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* and would exceed the parameter size constraints on at least SunOS.
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*
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* Redirect ioctls through a level of indirection: user-space assigns
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* NvKmsIoctlParams with the real command, size, and pointer, and
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* passes the NvKmsIoctlParams through the ioctl.
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*/
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struct NvKmsIoctlParams {
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NvU32 cmd;
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NvU32 size;
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NvU64 address NV_ALIGN_BYTES(8);
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};
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#define NVKMS_IOCTL_MAGIC 'm'
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#define NVKMS_IOCTL_CMD 0
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#define NVKMS_IOCTL_IOWR \
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_IOWR(NVKMS_IOCTL_MAGIC, NVKMS_IOCTL_CMD, struct NvKmsIoctlParams)
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/*!
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* User-space pointers are always passed to NVKMS in an NvU64.
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* This user-space address is eventually passed into the platform's
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* copyin/copyout functions, in a void* argument.
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*
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* This utility function converts from an NvU64 to a pointer.
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*/
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static inline void *nvKmsNvU64ToPointer(NvU64 value)
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{
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return (void *)(NvUPtr)value;
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}
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/*!
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* Before casting the NvU64 to a void*, check that casting to a pointer
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* size within the kernel does not lose any precision in the current
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* environment.
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*/
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static inline NvBool nvKmsNvU64AddressIsSafe(NvU64 address)
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{
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return address == (NvU64)(NvUPtr)address;
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}
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#endif /* NVKMS_IOCTL_H */
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