u-boot/arch/x86/include/asm/cache.h

/*
 * Copyright (c) 2011 The Chromium OS Authors.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef __X86_CACHE_H__
#define __X86_CACHE_H__

/*
 * If CONFIG_SYS_CACHELINE_SIZE is defined use it for DMA alignment.  Otherwise
 * use 64-bytes, a safe default for x86.
 */
#ifdef CONFIG_SYS_CACHELINE_SIZE
#define ARCH_DMA_MINALIGN	CONFIG_SYS_CACHELINE_SIZE
#else
#define ARCH_DMA_MINALIGN	64
#endif

static inline void wbinvd(void)
{
	asm volatile ("wbinvd" : : : "memory");
}

static inline void invd(void)
{
	asm volatile("invd" : : : "memory");
}

/* Enable caches and write buffer */
void enable_caches(void);

/* Disable caches and write buffer */
void disable_caches(void);

#endif /* __X86_CACHE_H__ */