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 /*
  32  * PCI Firmware Specification, Revision 3.0
  33  * 4.1.2 MCFG Table Description.
  34  */
  35 void build_mcfg(GArray *table_data, BIOSLinker *linker, AcpiMcfgInfo *info,
  36                 const char *oem_id, const char *oem_table_id)
  37 {
  38     AcpiTable table = { .sig = "MCFG", .rev = 1,
  39                         .oem_id = oem_id, .oem_table_id = oem_table_id };
  40
  41     acpi_table_begin(&table, table_data);
  42
  43     /* Reserved */
  44     build_append_int_noprefix(table_data, 0, 8);
  45     /*
  46      * Memory Mapped Enhanced Configuration Space Base Address Allocation
  47      * Structure
  48      */
  49     /* Base address, processor-relative */
  50     build_append_int_noprefix(table_data, info->base, 8);
  51     /* PCI segment group number */
  52     build_append_int_noprefix(table_data, 0, 2);
  53     /* Starting PCI Bus number */
  54     build_append_int_noprefix(table_data, 0, 1);
  55     /* Final PCI Bus number */
  56     build_append_int_noprefix(table_data, PCIE_MMCFG_BUS(info->size - 1), 1);
  57     /* Reserved */
  58     build_append_int_noprefix(table_data, 0, 4);
  59
  60     acpi_table_end(linker, &table);
  61 }