static void build_processor_devices(Aml *sb_scope, unsigned acpi_cpus, AcpiCpuInfo *cpu, AcpiPmInfo *pm) { int i; Aml *dev; Aml *crs; Aml *pkg; Aml *field; Aml *ifctx; Aml *method; /* The current AML generator can cover the APIC ID range [0..255], * inclusive, for VCPU hotplug. */ QEMU_BUILD_BUG_ON(ACPI_CPU_HOTPLUG_ID_LIMIT > 256); g_assert(acpi_cpus <= ACPI_CPU_HOTPLUG_ID_LIMIT); /* create PCI0.PRES device and its _CRS to reserve CPU hotplug MMIO */ dev = aml_device("PCI0." stringify(CPU_HOTPLUG_RESOURCE_DEVICE)); aml_append(dev, aml_name_decl("_HID", aml_eisaid("PNP0A06"))); aml_append(dev, aml_name_decl("_UID", aml_string("CPU Hotplug resources")) ); /* 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, pm->cpu_hp_io_base, pm->cpu_hp_io_base, 1, pm->cpu_hp_io_len) ); aml_append(dev, aml_name_decl("_CRS", crs)); aml_append(sb_scope, dev); /* declare CPU hotplug MMIO region and PRS field to access it */ aml_append(sb_scope, aml_operation_region( "PRST", AML_SYSTEM_IO, aml_int(pm->cpu_hp_io_base), pm->cpu_hp_io_len)); field = aml_field("PRST", AML_BYTE_ACC, AML_NOLOCK, AML_PRESERVE); aml_append(field, aml_named_field("PRS", 256)); aml_append(sb_scope, field); /* build Processor object for each processor */ for (i = 0; i < acpi_cpus; i++) { dev = aml_processor(i, 0, 0, "CP%.02X", i); method = aml_method("_MAT", 0, AML_NOTSERIALIZED); aml_append(method, aml_return(aml_call1(CPU_MAT_METHOD, aml_int(i)))); aml_append(dev, method); method = aml_method("_STA", 0, AML_NOTSERIALIZED); aml_append(method, aml_return(aml_call1(CPU_STATUS_METHOD, aml_int(i)))); aml_append(dev, method); method = aml_method("_EJ0", 1, AML_NOTSERIALIZED); aml_append(method, aml_return(aml_call2(CPU_EJECT_METHOD, aml_int(i), aml_arg(0))) ); aml_append(dev, method); aml_append(sb_scope, dev); } /* build this code: * Method(NTFY, 2) {If (LEqual(Arg0, 0x00)) {Notify(CP00, Arg1)} ...} */ /* Arg0 = Processor ID = APIC ID */ method = aml_method(AML_NOTIFY_METHOD, 2, AML_NOTSERIALIZED); for (i = 0; i < acpi_cpus; i++) { ifctx = aml_if(aml_equal(aml_arg(0), aml_int(i))); aml_append(ifctx, aml_notify(aml_name("CP%.02X", i), aml_arg(1)) ); aml_append(method, ifctx); } aml_append(sb_scope, method); /* build "Name(CPON, Package() { One, One, ..., Zero, Zero, ... })" * * Note: The ability to create variable-sized packages was first * introduced in ACPI 2.0. ACPI 1.0 only allowed fixed-size packages * ith up to 255 elements. Windows guests up to win2k8 fail when * VarPackageOp is used. */ pkg = acpi_cpus <= 255 ? aml_package(acpi_cpus) : aml_varpackage(acpi_cpus); for (i = 0; i < acpi_cpus; i++) { uint8_t b = test_bit(i, cpu->found_cpus) ? 0x01 : 0x00; aml_append(pkg, aml_int(b)); } aml_append(sb_scope, aml_name_decl(CPU_ON_BITMAP, pkg)); }