include/linux/firmware/trusted_foundations.h

Source file repositories/reference/linux-study-clean/include/linux/firmware/trusted_foundations.h

File Facts

System
Linux kernel
Corpus path
include/linux/firmware/trusted_foundations.h
Extension
.h
Size
2559 bytes
Lines
93
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct trusted_foundations_platform_data {
	unsigned int version_major;
	unsigned int version_minor;
};

#if IS_ENABLED(CONFIG_TRUSTED_FOUNDATIONS)

void register_trusted_foundations(struct trusted_foundations_platform_data *pd);
void of_register_trusted_foundations(void);
bool trusted_foundations_registered(void);

#else /* CONFIG_TRUSTED_FOUNDATIONS */
static inline void tf_dummy_write_sec(unsigned long val, unsigned int reg)
{
}

static inline void register_trusted_foundations(
				   struct trusted_foundations_platform_data *pd)
{
	/*
	 * If the system requires TF and we cannot provide it, continue booting
	 * but disable features that cannot be provided.
	 */
	pr_err("No support for Trusted Foundations, continuing in degraded mode.\n");
	pr_err("Secondary processors as well as CPU PM will be disabled.\n");
#if IS_ENABLED(CONFIG_CACHE_L2X0)
	pr_err("L2X0 cache will be kept disabled.\n");
	outer_cache.write_sec = tf_dummy_write_sec;
#endif
#if IS_ENABLED(CONFIG_SMP)
	setup_max_cpus = 0;
#endif
	cpu_idle_poll_ctrl(true);
}

static inline void of_register_trusted_foundations(void)
{
	struct device_node *np = of_find_compatible_node(NULL, NULL, "tlm,trusted-foundations");

	if (!np)
		return;
	of_node_put(np);
	/*
	 * If we find the target should enable TF but does not support it,
	 * fail as the system won't be able to do much anyway
	 */
	register_trusted_foundations(NULL);
}

static inline bool trusted_foundations_registered(void)
{
	return false;
}
#endif /* CONFIG_TRUSTED_FOUNDATIONS */

#endif

Annotation

Implementation Notes