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/*
* Copyright © 2025 Collabora Ltd.
*
* 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 UTIL_CACHE_OPS_H
#define UTIL_CACHE_OPS_H
#include <stdbool.h>
#include <stddef.h>
#include "detect_arch.h"
#include "u_cpu_detect.h"
#ifdef __cplusplus
extern "C" {
#endif
/** Returns true if we have cache operations available */
static inline bool
util_has_cache_ops(void)
{
/* TODO: Port to MSVC if and when we have Windows hardware drivers that
* need cache flushing ops.
*/
#if defined(_MSC_VER)
return false;
#endif
#if DETECT_ARCH_X86
return util_get_cpu_caps()->has_sse2;
#elif DETECT_ARCH_X86_64 || DETECT_ARCH_AARCH64
return true;
#else
return false;
#endif
}
/** Returns the cache granularity
*
* This is the maximum number of bytes that may be overwritten as the result
* of a cache flush or cache line eviction. On big.LITTLE platforms, the
* cache flush helpers may sometimes operate at a smaller granularity but may
* also round up to at most util_cache_granularity().
*
* Vulkan drivers should return this as nonCoherentAtomSize.
*/
size_t util_cache_granularity(void);
/** Flushes a range to main memory */
void util_flush_range(void *start, size_t size);
/** Flushes a range to main memory and invalidates those cache lines */
void util_flush_inval_range(void *start, size_t size);
/** Flushes a range to main memory without fencing
*
* This is for the case where you have a lot of ranges to flush and want to
* avoid unnecessary fencing. In this case, call
*
* util_pre_flush_fence()
* util_flush_range_no_fence()
* util_flush_range_no_fence()
* util_post_flush_fence()
*/
void util_flush_range_no_fence(void *start, size_t size);
/** Flushes a range to main memory and invalidates those cache lines without
* fencing
*
* This is for the case where you have a lot of ranges to flush and invalidate
* and want to avoid unnecessary fencing. In this case, call
*
* util_pre_flush_fence()
* util_flush_inval_range_no_fence()
* util_flush_range_no_fence()
* util_flush_inval_range_no_fence()
* util_post_flush_inval_fence()
*/
void util_flush_inval_range_no_fence(void *start, size_t size);
/** Fence between memory access and cache flush operations
*
* see util_flush_range_no_fence()
*/
void util_pre_flush_fence(void);
/** Fence between cache flush operations and memory access
*
* see util_flush_range_no_fence()
*/
void util_post_flush_fence(void);
/** Fence between cache invalidate operations and memory access
*
* see util_flush_inval_range_no_fence()
*/
void util_post_flush_inval_fence(void);
#ifdef __cplusplus
}
#endif
#endif /* UTIL_CACHE_OPS_H */
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