[Qemu-devel] [PATCH RFC 03/17] hw/apci: add _PRT method for extra root busses

[Marcel Apfelbaum <marcel@redhat.com>]

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/i386/acpi-build.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 9837120..cb77fa3 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -643,6 +643,82 @@ static void build_append_pci_bus_devices(AcpiAml *parent_scope, PCIBus *bus,
     aml_append(parent_scope, method);
 }
 
+static AcpiAml build_prt(void)
+{
+    AcpiAml method, pkg, if_ctx, while_ctx;
+
+    method = acpi_method("_PRT", 0);
+
+    aml_append(&method, acpi_store(acpi_package(128), acpi_local0()));
+    aml_append(&method, acpi_store(acpi_int(0), acpi_local1()));
+    while_ctx = acpi_while(acpi_lless(acpi_local1(), acpi_int(128)));
+    {
+        aml_append(&while_ctx,
+                acpi_store(acpi_shiftright(acpi_local1(), 2),
+                    acpi_local2()));
+        aml_append(&while_ctx, acpi_store(
+                    acpi_and(acpi_add(acpi_local1(), acpi_local2()), acpi_int(3)), acpi_local3()));
+
+        if_ctx = acpi_if(acpi_equal(acpi_local3(), acpi_int(0)));
+        {
+            pkg = acpi_package(4);
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_name("LNKD"));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&if_ctx, acpi_store(pkg, acpi_local4()));
+        }
+        aml_append(&while_ctx, if_ctx);
+
+        if_ctx = acpi_if(acpi_equal(acpi_local3(), acpi_int(1)));
+        {
+            pkg = acpi_package(4);
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_name("LNKA"));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&if_ctx, acpi_store(pkg, acpi_local4()));
+        }
+        aml_append(&while_ctx, if_ctx);
+
+        if_ctx = acpi_if(acpi_equal(acpi_local3(), acpi_int(2)));
+        {
+            pkg = acpi_package(4);
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_name("LNKB"));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&if_ctx, acpi_store(pkg, acpi_local4()));
+        }
+        aml_append(&while_ctx, if_ctx);
+
+        if_ctx = acpi_if(acpi_equal(acpi_local3(), acpi_int(3)));
+        {
+            pkg = acpi_package(4);
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&pkg, acpi_name("LNKC"));
+            aml_append(&pkg, acpi_int(0));
+            aml_append(&if_ctx, acpi_store(pkg, acpi_local4()));
+        }
+        aml_append(&while_ctx, if_ctx);
+
+        aml_append(&while_ctx, acpi_store(
+                    acpi_or(acpi_shiftleft(acpi_local2(), 16), acpi_int(0xFFFF)),
+                    acpi_index(acpi_local4(), acpi_int(0))));
+        aml_append(&while_ctx, acpi_store(
+                    acpi_and(acpi_local1(), acpi_int(3)),
+                    acpi_index(acpi_local4(), acpi_int(1))));
+        aml_append(&while_ctx, acpi_store(
+                    acpi_local4(), acpi_index(acpi_local0(), acpi_local1())));
+        aml_append(&while_ctx, acpi_increment(acpi_local1()));
+    }
+    aml_append(&method, while_ctx);
+    aml_append(&method, acpi_return(acpi_local0()));
+
+    return method;
+ }
+
 static void
 build_ssdt(AcpiAml *table_aml, GArray *linker,
            AcpiCpuInfo *cpu, AcpiPmInfo *pm, AcpiMiscInfo *misc,
@@ -685,6 +761,7 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
             aml_append(&dev, acpi_name_decl("_HID", acpi_string("PNP0A03")));
             aml_append(&dev,
                 acpi_name_decl("_BBN", acpi_int((uint8_t)bus_info->bus)));
+            aml_append(&dev, build_prt());
             aml_append(&scope, dev);
             aml_append(&ssdt, scope);
         }
-- 
2.1.0