1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
new file mode 100644
index 000000000..f329b0167
--- /dev/null
+++ b/drivers/acpi/acpica/exsystem.c
@@ -0,0 +1,274 @@
+// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
+/******************************************************************************
+ *
+ * Module Name: exsystem - Interface to OS services
+ *
+ * Copyright (C) 2000 - 2020, Intel Corp.
+ *
+ *****************************************************************************/
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acinterp.h"
+
+#define _COMPONENT          ACPI_EXECUTER
+ACPI_MODULE_NAME("exsystem")
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_wait_semaphore
+ *
+ * PARAMETERS:  semaphore       - Semaphore to wait on
+ *              timeout         - Max time to wait
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Implements a semaphore wait with a check to see if the
+ *              semaphore is available immediately. If it is not, the
+ *              interpreter is released before waiting.
+ *
+ ******************************************************************************/
+acpi_status acpi_ex_system_wait_semaphore(acpi_semaphore semaphore, u16 timeout)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ex_system_wait_semaphore);
+
+	status = acpi_os_wait_semaphore(semaphore, 1, ACPI_DO_NOT_WAIT);
+	if (ACPI_SUCCESS(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (status == AE_TIME) {
+
+		/* We must wait, so unlock the interpreter */
+
+		acpi_ex_exit_interpreter();
+		status = acpi_os_wait_semaphore(semaphore, 1, timeout);
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "*** Thread awake after blocking, %s\n",
+				  acpi_format_exception(status)));
+
+		/* Reacquire the interpreter */
+
+		acpi_ex_enter_interpreter();
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_wait_mutex
+ *
+ * PARAMETERS:  mutex           - Mutex to wait on
+ *              timeout         - Max time to wait
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Implements a mutex wait with a check to see if the
+ *              mutex is available immediately. If it is not, the
+ *              interpreter is released before waiting.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_wait_mutex(acpi_mutex mutex, u16 timeout)
+{
+	acpi_status status;
+
+	ACPI_FUNCTION_TRACE(ex_system_wait_mutex);
+
+	status = acpi_os_acquire_mutex(mutex, ACPI_DO_NOT_WAIT);
+	if (ACPI_SUCCESS(status)) {
+		return_ACPI_STATUS(status);
+	}
+
+	if (status == AE_TIME) {
+
+		/* We must wait, so unlock the interpreter */
+
+		acpi_ex_exit_interpreter();
+		status = acpi_os_acquire_mutex(mutex, timeout);
+
+		ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+				  "*** Thread awake after blocking, %s\n",
+				  acpi_format_exception(status)));
+
+		/* Reacquire the interpreter */
+
+		acpi_ex_enter_interpreter();
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_do_stall
+ *
+ * PARAMETERS:  how_long        - The amount of time to stall,
+ *                                in microseconds
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Suspend running thread for specified amount of time.
+ *              Note: ACPI specification requires that Stall() does not
+ *              relinquish the processor, and delays longer than 100 usec
+ *              should use Sleep() instead. We allow stalls up to 255 usec
+ *              for compatibility with other interpreters and existing BIOSs.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_do_stall(u32 how_long)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_ENTRY();
+
+	if (how_long > 255) {	/* 255 microseconds */
+		/*
+		 * Longer than 255 usec, this is an error
+		 *
+		 * (ACPI specifies 100 usec as max, but this gives some slack in
+		 * order to support existing BIOSs)
+		 */
+		ACPI_ERROR((AE_INFO,
+			    "Time parameter is too large (%u)", how_long));
+		status = AE_AML_OPERAND_VALUE;
+	} else {
+		acpi_os_stall(how_long);
+	}
+
+	return (status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_do_sleep
+ *
+ * PARAMETERS:  how_long        - The amount of time to sleep,
+ *                                in milliseconds
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Sleep the running thread for specified amount of time.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_do_sleep(u64 how_long)
+{
+	ACPI_FUNCTION_ENTRY();
+
+	/* Since this thread will sleep, we must release the interpreter */
+
+	acpi_ex_exit_interpreter();
+
+	/*
+	 * For compatibility with other ACPI implementations and to prevent
+	 * accidental deep sleeps, limit the sleep time to something reasonable.
+	 */
+	if (how_long > ACPI_MAX_SLEEP) {
+		how_long = ACPI_MAX_SLEEP;
+	}
+
+	acpi_os_sleep(how_long);
+
+	/* And now we must get the interpreter again */
+
+	acpi_ex_enter_interpreter();
+	return (AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_signal_event
+ *
+ * PARAMETERS:  obj_desc        - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Provides an access point to perform synchronization operations
+ *              within the AML.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_signal_event(union acpi_operand_object * obj_desc)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(ex_system_signal_event);
+
+	if (obj_desc) {
+		status =
+		    acpi_os_signal_semaphore(obj_desc->event.os_semaphore, 1);
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_wait_event
+ *
+ * PARAMETERS:  time_desc       - The 'time to delay' object descriptor
+ *              obj_desc        - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Provides an access point to perform synchronization operations
+ *              within the AML. This operation is a request to wait for an
+ *              event.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_system_wait_event(union acpi_operand_object *time_desc,
+			  union acpi_operand_object *obj_desc)
+{
+	acpi_status status = AE_OK;
+
+	ACPI_FUNCTION_TRACE(ex_system_wait_event);
+
+	if (obj_desc) {
+		status =
+		    acpi_ex_system_wait_semaphore(obj_desc->event.os_semaphore,
+						  (u16) time_desc->integer.
+						  value);
+	}
+
+	return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_system_reset_event
+ *
+ * PARAMETERS:  obj_desc        - The object descriptor for this op
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Reset an event to a known state.
+ *
+ ******************************************************************************/
+
+acpi_status acpi_ex_system_reset_event(union acpi_operand_object *obj_desc)
+{
+	acpi_status status = AE_OK;
+	acpi_semaphore temp_semaphore;
+
+	ACPI_FUNCTION_ENTRY();
+
+	/*
+	 * We are going to simply delete the existing semaphore and
+	 * create a new one!
+	 */
+	status =
+	    acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
+	if (ACPI_SUCCESS(status)) {
+		(void)acpi_os_delete_semaphore(obj_desc->event.os_semaphore);
+		obj_desc->event.os_semaphore = temp_semaphore;
+	}
+
+	return (status);
+}