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      1 /*	$NetBSD: i915_memcpy.h,v 1.2 2021/12/18 23:45:28 riastradh Exp $	*/
      2 
      3 /* SPDX-License-Identifier: MIT */
      4 /*
      5  * Copyright  2019 Intel Corporation
      6  */
      7 
      8 #ifndef __I915_MEMCPY_H__
      9 #define __I915_MEMCPY_H__
     10 
     11 #include <linux/types.h>
     12 
     13 struct drm_i915_private;
     14 
     15 void i915_memcpy_init_early(struct drm_i915_private *i915);
     16 
     17 bool i915_memcpy_from_wc(void *dst, const void *src, unsigned long len);
     18 void i915_unaligned_memcpy_from_wc(void *dst, void *src, unsigned long len);
     19 
     20 /* The movntdqa instructions used for memcpy-from-wc require 16-byte alignment,
     21  * as well as SSE4.1 support. i915_memcpy_from_wc() will report if it cannot
     22  * perform the operation. To check beforehand, pass in the parameters to
     23  * to i915_can_memcpy_from_wc() - since we only care about the low 4 bits,
     24  * you only need to pass in the minor offsets, page-aligned pointers are
     25  * always valid.
     26  *
     27  * For just checking for SSE4.1, in the foreknowledge that the future use
     28  * will be correctly aligned, just use i915_has_memcpy_from_wc().
     29  */
     30 #define i915_can_memcpy_from_wc(dst, src, len) \
     31 	i915_memcpy_from_wc((void *)((unsigned long)(dst) | (unsigned long)(src) | (len)), NULL, 0)
     32 
     33 #define i915_has_memcpy_from_wc() \
     34 	i915_memcpy_from_wc(NULL, NULL, 0)
     35 
     36 #endif /* __I915_MEMCPY_H__ */
     37