amd64/acpi/acpi.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsX8664AMD64
0007  *
0008  * @ingroup RTEMSBSPsX8664AMD64EFI
0009  *
0010  * @brief ACPI implementation
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 <assert.h>
0039 #include <acpi/acpi.h>
0040 #include <rtems/sysinit.h>
0041
0042 uint64_t acpi_rsdp_addr = 0;
0043
0044 static bool acpi_tables_initialized = false;
0045
0046 bool acpi_tables_initialize(void)
0047 {
0048   ACPI_STATUS status;
0049
0050   status = AcpiInitializeTables(NULL, ACPI_MAX_INIT_TABLES, FALSE);
0051
0052   if (status == (AE_OK)) {
0053     acpi_tables_initialized = true;
0054     return true;
0055   }
0056   return false;
0057 }
0058
0059 void acpi_walk_subtables(
0060   ACPI_TABLE_HEADER* table,
0061   size_t size_of_header,
0062   void (*handler)(ACPI_SUBTABLE_HEADER*)
0063 )
0064 {
0065   ACPI_SUBTABLE_HEADER* entry;
0066   ACPI_SUBTABLE_HEADER* end;
0067
0068   if (table == NULL) {
0069     return;
0070   }
0071
0072   entry = (ACPI_SUBTABLE_HEADER*) ((uint8_t*) table + size_of_header);
0073   end = (ACPI_SUBTABLE_HEADER*) ((uint8_t*) table + table->Length);
0074
0075   while (entry < end) {
0076     handler(entry);
0077     entry = (ACPI_SUBTABLE_HEADER*) ((uint8_t*) entry + entry->Length);
0078   }
0079 }
0080
0081 static void initialize_acpi(void)
0082 {
0083   ACPI_STATUS status;
0084   status = AcpiInitializeSubsystem();
0085   assert(status == (AE_OK));
0086
0087   if (acpi_tables_initialized == false) {
0088     status = AcpiInitializeTables(NULL, ACPI_MAX_INIT_TABLES, FALSE);
0089     assert(status == (AE_OK));
0090   }
0091
0092   status = AcpiLoadTables();
0093   assert(status == (AE_OK));
0094
0095   /* System Control Interrupts not supported */
0096   status = AcpiEnableSubsystem(ACPI_NO_HANDLER_INIT);
0097   assert(status == (AE_OK));
0098
0099   /* General Purpose Events not supported */
0100   status = AcpiInitializeObjects(ACPI_NO_EVENT_INIT);
0101   assert(status == (AE_OK));
0102 }
0103
0104 RTEMS_SYSINIT_ITEM(
0105   initialize_acpi,
0106   RTEMS_SYSINIT_DEVICE_DRIVERS,
0107   RTEMS_SYSINIT_ORDER_MIDDLE
0108 );