amd64/start/bspreset.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsX8664AMD64
0007  *
0008  * @ingroup RTEMSBSPsX8664AMD64EFI
0009  *
0010  * @brief BSP reset code
0011  */
0012
0013 /*
0014  * Copyright (C) 2024 Matheus Pecoraro
0015  *
0016  * Redistribution and use in source and binary forms, with or without
0017  * modification, are permitted provided that the following conditions
0018  * are met:
0019  * 1. Redistributions of source code must retain the above copyright
0020  *    notice, this list of conditions and the following disclaimer.
0021  * 2. Redistributions in binary form must reproduce the above copyright
0022  *    notice, this list of conditions and the following disclaimer in the
0023  *    documentation and/or other materials provided with the distribution.
0024  *
0025  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0026  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0027  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0028  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0029  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0030  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0031  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0032  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0033  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0034  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0035  * POSSIBILITY OF SUCH DAMAGE.
0036  */
0037
0038 #include <acpi/acpica/acpi.h>
0039 #include <bsp/bootcard.h>
0040
0041 #define KEYBOARD_CONTROLLER_PORT 0x64
0042 #define PULSE_RESET_LINE         0xFE
0043
0044 void bsp_reset( rtems_fatal_source source, rtems_fatal_code code )
0045 {
0046   (void) source;
0047   (void) code;
0048
0049   /**
0050    * It is possible that AcpiEnterSleepStatePrep causes a thread dispatch
0051    * so we execute it with interrupts enabled
0052    */
0053   amd64_enable_interrupts();
0054   ACPI_STATUS status = AcpiEnterSleepStatePrep(ACPI_STATE_S5);
0055   amd64_disable_interrupts();
0056
0057   if (status == AE_OK) {
0058     AcpiEnterSleepState(ACPI_STATE_S5);
0059   }
0060
0061   /* Should be unreachable. As a fallback try the keyboard controller method */
0062   outport_byte(KEYBOARD_CONTROLLER_PORT, PULSE_RESET_LINE);
0063   RTEMS_UNREACHABLE();
0064 }