4  * Module Name: evglock - Global Lock support
29  * DESCRIPTION: Install a handler for the global lock release event
39 	/* If Hardware Reduced flag is set, there is no global lock */  in acpi_ev_init_global_lock_handler()
49 	/* Attempt installation of the global lock handler */  in acpi_ev_init_global_lock_handler()
56 	 * If the global lock does not exist on this platform, the attempt to  in acpi_ev_init_global_lock_handler()
58 	 * Map to AE_OK, but mark global lock as not present. Any attempt to  in acpi_ev_init_global_lock_handler()
59 	 * actually use the global lock will be flagged with an error.  in acpi_ev_init_global_lock_handler()
64 			    "No response from Global Lock hardware, disabling lock"));  in acpi_ev_init_global_lock_handler()
87  * DESCRIPTION: Remove the handler for the Global Lock
113  * DESCRIPTION: Invoked directly from the SCI handler when a global lock
127 	 * If a request for the global lock is not actually pending,  in acpi_ev_global_lock_handler()
128 	 * we are done. This handles "spurious" global lock interrupts  in acpi_ev_global_lock_handler()
136 	 * Send a unit to the global lock semaphore. The actual acquisition  in acpi_ev_global_lock_handler()
137 	 * of the global lock will be performed by the waiting thread.  in acpi_ev_global_lock_handler()
141 		ACPI_ERROR((AE_INFO, "Could not signal Global Lock semaphore"));  in acpi_ev_global_lock_handler()
160  * DESCRIPTION: Attempt to gain ownership of the Global Lock.
165  * Global Lock, and the OS would hold the lock until the last thread had
169  * allows only one thread to acquire the HW Global Lock at a time, and makes
170  * the global lock appear as a standard mutex on the OS side.
194 	 * Update the global lock handle and check for wraparound. The handle is  in acpi_ev_acquire_global_lock()
195 	 * only used for the external global lock interfaces, but it is updated  in acpi_ev_acquire_global_lock()
207 	 * Make sure that a global lock actually exists. If not, just  in acpi_ev_acquire_global_lock()
225 					  "Acquired hardware Global Lock\n"));  in acpi_ev_acquire_global_lock()
231 		 * we must now wait until we receive the global lock  in acpi_ev_acquire_global_lock()
238 				  "Waiting for hardware Global Lock\n"));  in acpi_ev_acquire_global_lock()
241 		 * Wait for handshake with the global lock interrupt handler.  in acpi_ev_acquire_global_lock()
266  * DESCRIPTION: Releases ownership of the Global Lock.
281 			      "Cannot release the ACPI Global Lock, it has not been acquired"));  in acpi_ev_release_global_lock()
303 				  "Released hardware Global Lock\n"));  in acpi_ev_release_global_lock()