Add a fw_cfg device node to the ACPI SSDT. While the guest-side BIOS can't utilize this information (since it has to access the hard-coded fw_cfg device to extract ACPI tables to begin with), having fw_cfg listed in ACPI will help the guest kernel keep a more accurate inventory of in-use IO port regions.
Signed-off-by: Gabriel Somlo <so...@cmu.edu> --- hw/i386/acpi-build.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 95e0c65..9d0ec22 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1071,6 +1071,25 @@ build_ssdt(GArray *table_data, GArray *linker, aml_append(scope, aml_name_decl("_S5", pkg)); aml_append(ssdt, scope); + if (guest_info->fw_cfg) { + scope = aml_scope("\\_SB"); + dev = aml_device("FWCF"); + + aml_append(dev, aml_name_decl("_HID", aml_string("FWCF0001"))); + /* device present, functioning, decoding, not shown in UI */ + aml_append(dev, aml_name_decl("_STA", aml_int(0xB))); + + crs = aml_resource_template(); + aml_append(crs, + aml_io(AML_DECODE16, FW_CFG_IO_BASE, FW_CFG_IO_BASE, + 0x01, FW_CFG_IO_SIZE) + ); + aml_append(dev, aml_name_decl("_CRS", crs)); + + aml_append(scope, dev); + aml_append(ssdt, scope); + } + if (misc->applesmc_io_base) { scope = aml_scope("\\_SB.PCI0.ISA"); dev = aml_device("SMC"); -- 2.4.3