acrn-config: get default pci mmcfg base address

parse default pci mmcfg base address from target board.

Tracked-On: #4173
Signed-off-by: Wei Liu <weix.w.liu@intel.com>
Acked-by: Victor Sun <victor.sun@intel.com>

Author: Wei Liu

misc/acrn-config/board_config/acpi_platform_h.py

@@ -168,6 +168,7 @@ def platform_info_parser(config, default_platform):
     write_direct_info_parser(config, "<WAKE_VECTOR_INFO>", "</WAKE_VECTOR_INFO>")
     write_direct_info_parser(config, "<RESET_REGISTER_INFO>", "</RESET_REGISTER_INFO>")
     drhd_info_parser(config)
+    write_direct_info_parser(config, "<MMCFG_BASE_INFO>", "</MMCFG_BASE_INFO>")
 
 
 def generate_file(config, default_platform):

misc/acrn-config/target/acpi.py

@@ -115,6 +115,9 @@ def style_check_2(self):
 PACK_TYPE_LEN = 12
 WAKE_VECTOR_OFFSET_32 = 12
 WAKE_VECTOR_OFFSET_64 = 24
+MCFG_OFFSET = 4
+MCFG_ENTRY1_OFFSET = 60
+MCFG_ENTRY0_BASE_OFFSET = 44
 
 S3_PKG = SxPkg()
 S5_PKG = SxPkg()
@@ -559,6 +562,23 @@ def store_px_data(sysnode, config):
 
         p_cnt += 1
 
+def store_mmcfg_base_data(mmcfg_node, config):
+
+    print("\t/* PCI mmcfg base of MCFG */", file=config)
+    with open(mmcfg_node, 'rb') as mmcfg:
+        mmcfg.read(MCFG_OFFSET)
+        mmcfg_len_obj = mmcfg.read(DWORD_LEN)
+        mmcfg_len_int = int.from_bytes(mmcfg_len_obj, 'little')
+
+        if mmcfg_len_int > MCFG_ENTRY1_OFFSET:
+            parser_lib.print_red("Multiple PCI segment groups is not supported!", err=True)
+            sys.exit(1)
+
+        mmcfg.seek(MCFG_ENTRY0_BASE_OFFSET, 0)
+        mmcfg_base_addr_obj = mmcfg.read(DWORD_LEN)
+        mmcfg_base_addr = int.from_bytes(mmcfg_base_addr_obj, 'little')
+        print("\t#define DEFAULT_PCI_MMCFG_BASE   {}UL".format(hex(mmcfg_base_addr)), file=config)
+
 
 def gen_acpi_info(config):
     """This will parser the sys node form SYS_PATH and generate ACPI info
@@ -590,6 +610,10 @@ def gen_acpi_info(config):
     store_px_data(SYS_PATH[2], config)
     print("{0}".format("\t</PX_INFO>\n"), file=config)
 
+    print("{0}".format("\t<MMCFG_BASE_INFO>"), file=config)
+    store_mmcfg_base_data(SYS_PATH[1] + 'MCFG', config)
+    print("{0}".format("\t</MMCFG_BASE_INFO>\n"), file=config)
+
 
 def generate_info(board_file):
     """This will generate ACPI info from board file