hw/apci: add _PRT method for extra PCI root busses
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Laszlo Ersek <lersek@redhat.com>
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@ -617,6 +617,86 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus,
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aml_append(parent_scope, method);
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aml_append(parent_scope, method);
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}
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}
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/*
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* initialize_route - Initialize the interrupt routing rule
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* through a specific LINK:
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* if (lnk_idx == idx)
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* route using link 'link_name'
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*/
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static Aml *initialize_route(Aml *route, const char *link_name,
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Aml *lnk_idx, int idx)
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{
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Aml *if_ctx = aml_if(aml_equal(lnk_idx, aml_int(idx)));
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Aml *pkg = aml_package(4);
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aml_append(pkg, aml_int(0));
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aml_append(pkg, aml_int(0));
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aml_append(pkg, aml_name("%s", link_name));
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aml_append(pkg, aml_int(0));
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aml_append(if_ctx, aml_store(pkg, route));
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return if_ctx;
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}
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/*
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* build_prt - Define interrupt rounting rules
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*
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* Returns an array of 128 routes, one for each device,
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* based on device location.
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* The main goal is to equaly distribute the interrupts
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* over the 4 existing ACPI links (works only for i440fx).
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* The hash function is (slot + pin) & 3 -> "LNK[D|A|B|C]".
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*
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*/
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static Aml *build_prt(void)
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{
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Aml *method, *while_ctx, *pin, *res;
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method = aml_method("_PRT", 0);
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res = aml_local(0);
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pin = aml_local(1);
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aml_append(method, aml_store(aml_package(128), res));
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aml_append(method, aml_store(aml_int(0), pin));
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/* while (pin < 128) */
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while_ctx = aml_while(aml_lless(pin, aml_int(128)));
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{
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Aml *slot = aml_local(2);
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Aml *lnk_idx = aml_local(3);
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Aml *route = aml_local(4);
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/* slot = pin >> 2 */
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aml_append(while_ctx,
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aml_store(aml_shiftright(pin, aml_int(2)), slot));
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/* lnk_idx = (slot + pin) & 3 */
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aml_append(while_ctx,
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aml_store(aml_and(aml_add(pin, slot), aml_int(3)), lnk_idx));
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/* route[2] = "LNK[D|A|B|C]", selection based on pin % 3 */
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aml_append(while_ctx, initialize_route(route, "LNKD", lnk_idx, 0));
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aml_append(while_ctx, initialize_route(route, "LNKA", lnk_idx, 1));
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aml_append(while_ctx, initialize_route(route, "LNKB", lnk_idx, 2));
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aml_append(while_ctx, initialize_route(route, "LNKC", lnk_idx, 3));
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/* route[0] = 0x[slot]FFFF */
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aml_append(while_ctx,
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aml_store(aml_or(aml_shiftleft(slot, aml_int(16)), aml_int(0xFFFF)),
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aml_index(route, aml_int(0))));
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/* route[1] = pin & 3 */
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aml_append(while_ctx,
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aml_store(aml_and(pin, aml_int(3)), aml_index(route, aml_int(1))));
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/* res[pin] = route */
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aml_append(while_ctx, aml_store(route, aml_index(res, pin)));
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/* pin++ */
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aml_append(while_ctx, aml_increment(pin));
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}
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aml_append(method, while_ctx);
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/* return res*/
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aml_append(method, aml_return(res));
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return method;
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}
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static void
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static void
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build_ssdt(GArray *table_data, GArray *linker,
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build_ssdt(GArray *table_data, GArray *linker,
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AcpiCpuInfo *cpu, AcpiPmInfo *pm, AcpiMiscInfo *misc,
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AcpiCpuInfo *cpu, AcpiPmInfo *pm, AcpiMiscInfo *misc,
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@ -655,6 +735,7 @@ build_ssdt(GArray *table_data, GArray *linker,
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aml_name_decl("_UID", aml_string("PC%.02X", bus_num)));
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aml_name_decl("_UID", aml_string("PC%.02X", bus_num)));
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aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A03")));
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aml_append(dev, aml_name_decl("_HID", aml_string("PNP0A03")));
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aml_append(dev, aml_name_decl("_BBN", aml_int(bus_num)));
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aml_append(dev, aml_name_decl("_BBN", aml_int(bus_num)));
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aml_append(dev, build_prt());
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aml_append(scope, dev);
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aml_append(scope, dev);
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aml_append(ssdt, scope);
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aml_append(ssdt, scope);
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}
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}
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