hw/acpi/pci.c

   1 /*
   2  * Support for generating PCI related ACPI tables and passing them to Guests
   3  *
   4  * Copyright (C) 2006 Fabrice Bellard
   5  * Copyright (C) 2008-2010  Kevin O'Connor <kevin@koconnor.net>
   6  * Copyright (C) 2013-2019 Red Hat Inc
   7  * Copyright (C) 2019 Intel Corporation
   8  *
   9  * Author: Wei Yang <richardw.yang@linux.intel.com>
  10  * Author: Michael S. Tsirkin <mst@redhat.com>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21
  22  * You should have received a copy of the GNU General Public License along
  23  * with this program; if not, see <http://www.gnu.org/licenses/>.
  24  */
  25
  26 #include "qemu/osdep.h"
  27 #include "hw/acpi/aml-build.h"
  28 #include "hw/acpi/pci.h"
  29 #include "hw/pci/pcie_host.h"
  30
  31 void build_mcfg(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info)
  32 {
  33     int mcfg_start = table_data->len;
  34
  35     /*
  36      * PCI Firmware Specification, Revision 3.0
  37      * 4.1.2 MCFG Table Description.
  38      */
  39     acpi_data_push(table_data, sizeof(AcpiTableHeader));
  40     /* Reserved */
  41     build_append_int_noprefix(table_data, 0, 8);
  42
  43     /*
  44      * Memory Mapped Enhanced Configuration Space Base Address Allocation
  45      * Structure
  46      */
  47     /* Base address, processor-relative */
  48     build_append_int_noprefix(table_data, info->base, 8);
  49     /* PCI segment group number */
  50     build_append_int_noprefix(table_data, 0, 2);
  51     /* Starting PCI Bus number */
  52     build_append_int_noprefix(table_data, 0, 1);
  53     /* Final PCI Bus number */
  54     build_append_int_noprefix(table_data, PCIE_MMCFG_BUS(info->size - 1), 1);
  55     /* Reserved */
  56     build_append_int_noprefix(table_data, 0, 4);
  57
  58     build_header(linker, table_data, (void *)(table_data->data + mcfg_start),
  59                  "MCFG", table_data->len - mcfg_start, 1, NULL, NULL);
  60 }
  61