linux/include/linux/cc_platform.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Confidential Computing Platform Capability checks
 *
 * Copyright (C) 2021 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <[email protected]>
 */

#ifndef _LINUX_CC_PLATFORM_H
#define _LINUX_CC_PLATFORM_H

#include <linux/types.h>
#include <linux/stddef.h>

/**
 * enum cc_attr - Confidential computing attributes
 *
 * These attributes represent confidential computing features that are
 * currently active.
 */
enum cc_attr { … };

#ifdef CONFIG_ARCH_HAS_CC_PLATFORM

/**
 * cc_platform_has() - Checks if the specified cc_attr attribute is active
 * @attr: Confidential computing attribute to check
 *
 * The cc_platform_has() function will return an indicator as to whether the
 * specified Confidential Computing attribute is currently active.
 *
 * Context: Any context
 * Return:
 * * TRUE  - Specified Confidential Computing attribute is active
 * * FALSE - Specified Confidential Computing attribute is not active
 */
bool cc_platform_has(enum cc_attr attr);
void cc_platform_set(enum cc_attr attr);
void cc_platform_clear(enum cc_attr attr);

#else	/* !CONFIG_ARCH_HAS_CC_PLATFORM */

static inline bool cc_platform_has(enum cc_attr attr) { return false; }
static inline void cc_platform_set(enum cc_attr attr) { }
static inline void cc_platform_clear(enum cc_attr attr) { }

#endif	/* CONFIG_ARCH_HAS_CC_PLATFORM */

#endif	/* _LINUX_CC_PLATFORM_H */