| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <inttypes.h> |
| #include <limits.h> |
| #include <sys/types.h> |
| #include <zircon/assert.h> |
| #include <zircon/compiler.h> |
| #include <zircon/process.h> |
| #include <zircon/syscalls.h> |
| #include <zircon/syscalls/iommu.h> |
| #include <zircon/syscalls/resource.h> |
| #include <zircon/threads.h> |
| |
| #include <variant> |
| #include <vector> |
| |
| #include <acpica/acpi.h> |
| #include <ddk/debug.h> |
| #include <ddk/protocol/acpi.h> |
| #include <ddk/protocol/pciroot.h> |
| #include <ddk/protocol/sysmem.h> |
| #include <fbl/auto_lock.h> |
| |
| #include "acpi-private.h" |
| #include "acpi.h" |
| #include "dev.h" |
| #include "errors.h" |
| #include "iommu.h" |
| #include "methods.h" |
| #include "nhlt.h" |
| #include "pci.h" |
| #include "power.h" |
| #include "resources.h" |
| #include "sysmem.h" |
| |
| ACPI_STATUS AcpiDevice::AddResource(ACPI_RESOURCE* res) { |
| if (resource_is_memory(res)) { |
| resource_memory_t mem; |
| zx_status_t st = resource_parse_memory(res, &mem); |
| // only expect fixed memory resource. resource_parse_memory sets minimum == maximum |
| // for this memory resource type. |
| if ((st != ZX_OK) || (mem.minimum != mem.maximum)) { |
| return AE_ERROR; |
| } |
| mmio_resources_.emplace_back(mem); |
| |
| } else if (resource_is_address(res)) { |
| resource_address_t addr; |
| zx_status_t st = resource_parse_address(res, &addr); |
| if (st != ZX_OK) { |
| return AE_ERROR; |
| } |
| if ((addr.resource_type == RESOURCE_ADDRESS_MEMORY) && addr.min_address_fixed && |
| addr.max_address_fixed && (addr.maximum < addr.minimum)) { |
| mmio_resources_.emplace_back(/* writeable= */ true, addr.min_address_fixed, |
| /* alignment= */ 0, static_cast<uint32_t>(addr.address_length)); |
| } |
| |
| } else if (resource_is_io(res)) { |
| resource_io_t io; |
| zx_status_t st = resource_parse_io(res, &io); |
| if (st != ZX_OK) { |
| return AE_ERROR; |
| } |
| |
| pio_resources_.emplace_back(io); |
| |
| } else if (resource_is_irq(res)) { |
| resource_irq_t irq; |
| zx_status_t st = resource_parse_irq(res, &irq); |
| if (st != ZX_OK) { |
| return AE_ERROR; |
| } |
| for (auto i = 0; i < irq.pin_count; i++) { |
| irqs_.emplace_back(irq, i); |
| } |
| } |
| |
| return AE_OK; |
| } |
| |
| zx_status_t AcpiDevice::ReportCurrentResources() { |
| if (got_resources_) { |
| return ZX_OK; |
| } |
| |
| // call _CRS to fill in resources |
| ACPI_STATUS acpi_status = AcpiWalkResources( |
| acpi_handle_, (char*)"_CRS", |
| [](ACPI_RESOURCE* res, void* ctx) { |
| return reinterpret_cast<AcpiDevice*>(ctx)->AddResource(res); |
| }, |
| this); |
| if ((acpi_status != AE_NOT_FOUND) && (acpi_status != AE_OK)) { |
| return acpi_to_zx_status(acpi_status); |
| } |
| |
| zxlogf(TRACE, "acpi-bus[%s]: found %zd port resources %zd memory resources %zx irqs", |
| device_get_name(zxdev_), pio_resources_.size(), mmio_resources_.size(), irqs_.size()); |
| if (zxlog_level_enabled(SPEW)) { |
| zxlogf(SPEW, "port resources:"); |
| for (size_t i = 0; i < pio_resources_.size(); i++) { |
| zxlogf(SPEW, " %02zd: addr=0x%x length=0x%x align=0x%x", i, pio_resources_[i].base_address, |
| pio_resources_[i].address_length, pio_resources_[i].alignment); |
| } |
| zxlogf(SPEW, "memory resources:"); |
| for (size_t i = 0; i < mmio_resources_.size(); i++) { |
| zxlogf(SPEW, " %02zd: addr=0x%x length=0x%x align=0x%x writeable=%d", i, |
| mmio_resources_[i].base_address, mmio_resources_[i].address_length, |
| mmio_resources_[i].alignment, mmio_resources_[i].writeable); |
| } |
| zxlogf(SPEW, "irqs:"); |
| for (size_t i = 0; i < irqs_.size(); i++) { |
| const char* trigger; |
| switch (irqs_[i].trigger) { |
| case ACPI_IRQ_TRIGGER_EDGE: |
| trigger = "edge"; |
| break; |
| case ACPI_IRQ_TRIGGER_LEVEL: |
| trigger = "level"; |
| break; |
| default: |
| trigger = "bad_trigger"; |
| break; |
| } |
| const char* polarity; |
| switch (irqs_[i].polarity) { |
| case ACPI_IRQ_ACTIVE_BOTH: |
| polarity = "both"; |
| break; |
| case ACPI_IRQ_ACTIVE_LOW: |
| polarity = "low"; |
| break; |
| case ACPI_IRQ_ACTIVE_HIGH: |
| polarity = "high"; |
| break; |
| default: |
| polarity = "bad_polarity"; |
| break; |
| } |
| zxlogf(SPEW, " %02zd: pin=%u %s %s %s %s", i, irqs_[i].pin, trigger, polarity, |
| (irqs_[i].sharable == ACPI_IRQ_SHARED) ? "shared" : "exclusive", |
| irqs_[i].wake_capable ? "wake" : "nowake"); |
| } |
| } |
| |
| got_resources_ = true; |
| |
| return ZX_OK; |
| } |
| |
| zx_status_t AcpiDevice::AcpiGetPio(uint32_t index, zx::resource* out_pio) { |
| fbl::AutoLock<fbl::Mutex> guard{&lock_}; |
| zx_status_t st = ReportCurrentResources(); |
| if (st != ZX_OK) { |
| return st; |
| } |
| |
| if (index >= pio_resources_.size()) { |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| const AcpiDevicePioResource& res = pio_resources_[index]; |
| |
| // Please do not use get_root_resource() in new code. See ZX-1467. |
| // TODO: figure out what to pass to name here |
| return zx::resource::create(*zx::unowned_resource{get_root_resource()}, ZX_RSRC_KIND_IOPORT, |
| res.base_address, res.address_length, device_get_name(zxdev_), 0, |
| out_pio); |
| } |
| |
| zx_status_t AcpiDevice::AcpiGetMmio(uint32_t index, acpi_mmio* out_mmio) { |
| fbl::AutoLock<fbl::Mutex> guard{&lock_}; |
| zx_status_t st = ReportCurrentResources(); |
| if (st != ZX_OK) { |
| return st; |
| } |
| |
| if (index >= mmio_resources_.size()) { |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| const AcpiDeviceMmioResource& res = mmio_resources_[index]; |
| if (((res.base_address & (PAGE_SIZE - 1)) != 0) || |
| ((res.address_length & (PAGE_SIZE - 1)) != 0)) { |
| zxlogf(ERROR, "acpi-bus[%s]: memory id=%d addr=0x%08x len=0x%x is not page aligned", |
| device_get_name(zxdev_), index, res.base_address, res.address_length); |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| zx_handle_t vmo; |
| size_t size{res.address_length}; |
| // Please do not use get_root_resource() in new code. See ZX-1467. |
| st = zx_vmo_create_physical(get_root_resource(), res.base_address, size, &vmo); |
| if (st != ZX_OK) { |
| return st; |
| } |
| |
| out_mmio->offset = 0; |
| out_mmio->size = size; |
| out_mmio->vmo = vmo; |
| |
| return ZX_OK; |
| } |
| |
| zx_status_t AcpiDevice::AcpiMapInterrupt(int64_t which_irq, zx::interrupt* out_handle) { |
| fbl::AutoLock<fbl::Mutex> guard{&lock_}; |
| zx_status_t st = ReportCurrentResources(); |
| if (st != ZX_OK) { |
| return st; |
| } |
| |
| if ((uint)which_irq >= irqs_.size()) { |
| return ZX_ERR_NOT_FOUND; |
| } |
| |
| const AcpiDeviceIrqResource& irq = irqs_[which_irq]; |
| uint32_t mode; |
| mode = ZX_INTERRUPT_MODE_DEFAULT; |
| st = ZX_OK; |
| switch (irq.trigger) { |
| case ACPI_IRQ_TRIGGER_EDGE: |
| switch (irq.polarity) { |
| case ACPI_IRQ_ACTIVE_BOTH: |
| mode = ZX_INTERRUPT_MODE_EDGE_BOTH; |
| break; |
| case ACPI_IRQ_ACTIVE_LOW: |
| mode = ZX_INTERRUPT_MODE_EDGE_LOW; |
| break; |
| case ACPI_IRQ_ACTIVE_HIGH: |
| mode = ZX_INTERRUPT_MODE_EDGE_HIGH; |
| break; |
| default: |
| st = ZX_ERR_INVALID_ARGS; |
| break; |
| } |
| break; |
| case ACPI_IRQ_TRIGGER_LEVEL: |
| switch (irq.polarity) { |
| case ACPI_IRQ_ACTIVE_LOW: |
| mode = ZX_INTERRUPT_MODE_LEVEL_LOW; |
| break; |
| case ACPI_IRQ_ACTIVE_HIGH: |
| mode = ZX_INTERRUPT_MODE_LEVEL_HIGH; |
| break; |
| default: |
| st = ZX_ERR_INVALID_ARGS; |
| break; |
| } |
| break; |
| default: |
| st = ZX_ERR_INVALID_ARGS; |
| break; |
| } |
| if (st != ZX_OK) { |
| return st; |
| } |
| // Please do not use get_root_resource() in new code. See ZX-1467. |
| return zx::interrupt::create(*zx::unowned_resource{get_root_resource()}, irq.pin, |
| ZX_INTERRUPT_REMAP_IRQ | mode, out_handle); |
| } |
| |
| zx_status_t AcpiDevice::AcpiGetBti(uint32_t bdf, uint32_t index, zx::bti* bti) { |
| // The x86 IOMMU world uses PCI BDFs as the hardware identifiers, so there |
| // will only be one BTI per device. |
| ZX_ASSERT(index == 0); |
| // For dummy IOMMUs, the bti_id just needs to be unique. For Intel IOMMUs, |
| // the bti_ids correspond to PCI BDFs. |
| zx_handle_t iommu_handle; |
| zx_status_t status = iommu_manager_iommu_for_bdf(bdf, &iommu_handle); |
| if (status != ZX_OK) { |
| return status; |
| } |
| return zx::bti::create(*zx::unowned_iommu{iommu_handle}, 0, bdf, bti); |
| } |
| |
| zx_status_t AcpiDevice::AcpiConnectSysmem(zx::channel connection) { |
| fbl::AutoLock<fbl::Mutex> guard{&lock_}; |
| sysmem_protocol_t sysmem; |
| zx_status_t st = device_get_protocol(platform_bus_, ZX_PROTOCOL_SYSMEM, &sysmem); |
| if (st != ZX_OK) { |
| return st; |
| } |
| return sysmem_connect(&sysmem, connection.release()); |
| } |
| |
| zx_status_t AcpiDevice::AcpiRegisterSysmemHeap(uint64_t heap, zx::channel connection) { |
| fbl::AutoLock<fbl::Mutex> guard{&lock_}; |
| sysmem_protocol_t sysmem; |
| zx_status_t st = device_get_protocol(platform_bus_, ZX_PROTOCOL_SYSMEM, &sysmem); |
| if (st != ZX_OK) { |
| return st; |
| } |
| return sysmem_register_heap(&sysmem, heap, connection.release()); |
| } |
| |
| static const char* hid_from_acpi_devinfo(ACPI_DEVICE_INFO* info) { |
| const char* hid = nullptr; |
| if ((info->Valid & ACPI_VALID_HID) && (info->HardwareId.Length > 0) && |
| ((info->HardwareId.Length - 1) <= sizeof(uint64_t))) { |
| hid = (const char*)info->HardwareId.String; |
| } |
| return hid; |
| } |
| |
| device_add_args_t get_device_add_args(const char* name, ACPI_DEVICE_INFO* info, |
| std::array<zx_device_prop_t, 4>* out_props) { |
| zx_device_prop_t* props = out_props->data(); |
| int propcount = 0; |
| |
| char acpi_name[5] = {0}; |
| if (!name) { |
| memcpy(acpi_name, &info->Name, sizeof(acpi_name) - 1); |
| name = (const char*)acpi_name; |
| } |
| |
| // Publish HID in device props |
| const char* hid = hid_from_acpi_devinfo(info); |
| if (hid) { |
| props[propcount].id = BIND_ACPI_HID_0_3; |
| props[propcount++].value = htobe32(*((uint32_t*)(hid))); |
| props[propcount].id = BIND_ACPI_HID_4_7; |
| props[propcount++].value = htobe32(*((uint32_t*)(hid + 4))); |
| } |
| |
| // Publish the first CID in device props |
| const char* cid = (const char*)info->CompatibleIdList.Ids[0].String; |
| if ((info->Valid & ACPI_VALID_CID) && (info->CompatibleIdList.Count > 0) && |
| ((info->CompatibleIdList.Ids[0].Length - 1) <= sizeof(uint64_t))) { |
| props[propcount].id = BIND_ACPI_CID_0_3; |
| |
| // Use memcpy() to safely access a uint32_t from a misaligned address. |
| uint32_t value; |
| memcpy(&value, cid, sizeof(value)); |
| props[propcount++].value = htobe32(value); |
| props[propcount].id = BIND_ACPI_CID_4_7; |
| |
| memcpy(&value, cid + 4, sizeof(value)); |
| props[propcount++].value = htobe32(value); |
| } |
| |
| if (zxlog_level_enabled(SPEW)) { |
| // ACPI names are always 4 characters in a uint32 |
| zxlogf(SPEW, "acpi: got device %s", acpi_name); |
| if (info->Valid & ACPI_VALID_HID) { |
| zxlogf(SPEW, " HID=%s", info->HardwareId.String); |
| } else { |
| zxlogf(SPEW, " HID=invalid"); |
| } |
| if (info->Valid & ACPI_VALID_ADR) { |
| zxlogf(SPEW, " ADR=0x%" PRIx64 "", (uint64_t)info->Address); |
| } else { |
| zxlogf(SPEW, " ADR=invalid"); |
| } |
| if (info->Valid & ACPI_VALID_CID) { |
| zxlogf(SPEW, " CIDS=%d", info->CompatibleIdList.Count); |
| for (uint i = 0; i < info->CompatibleIdList.Count; i++) { |
| zxlogf(SPEW, " [%u] %s", i, info->CompatibleIdList.Ids[i].String); |
| } |
| } else { |
| zxlogf(SPEW, " CID=invalid"); |
| } |
| zxlogf(SPEW, " devprops:"); |
| for (int i = 0; i < propcount; i++) { |
| zxlogf(SPEW, " [%d] id=0x%08x value=0x%08x", i, props[i].id, props[i].value); |
| } |
| } |
| |
| return {.name = name, |
| .props = (propcount > 0) ? props : nullptr, |
| .prop_count = static_cast<uint32_t>(propcount)}; |
| } |
| |
| zx_device_t* AcpiWalker::PublishAcpiDevice(const char* name, ACPI_HANDLE handle, |
| ACPI_DEVICE_INFO* info) { |
| auto device = std::make_unique<AcpiDevice>(acpi_root_, handle, platform_bus_); |
| std::array<zx_device_prop_t, 4> props; |
| if (zx_status_t status = device->DdkAdd(name, get_device_add_args(name, info, &props)); |
| status != ZX_OK) { |
| zxlogf(ERROR, "acpi: error %d in DdkAdd, parent=%s(%p)", status, device_get_name(acpi_root_), |
| acpi_root_); |
| return nullptr; |
| } else { |
| zxlogf(INFO, "acpi: published device %s(%p), parent=%s(%p), handle=%p", name, device.get(), |
| device_get_name(acpi_root_), acpi_root_, device->acpi_handle()); |
| // device_add takes ownership of device, but only on success. |
| return device.release()->zxdev(); |
| } |
| } |
| |
| static void acpi_apply_workarounds(ACPI_HANDLE object, ACPI_DEVICE_INFO* info) { |
| ACPI_STATUS acpi_status; |
| // Slate workaround: Turn on the HID controller. |
| if (!memcmp(&info->Name, "I2C0", 4)) { |
| ACPI_BUFFER buffer = { |
| .Length = ACPI_ALLOCATE_BUFFER, |
| .Pointer = nullptr, |
| }; |
| acpi_status = AcpiEvaluateObject(object, (char*)"H00A._PR0", nullptr, &buffer); |
| if (acpi_status == AE_OK) { |
| ACPI_OBJECT* pkg = static_cast<ACPI_OBJECT*>(buffer.Pointer); |
| for (unsigned i = 0; i < pkg->Package.Count; i++) { |
| ACPI_OBJECT* ref = &pkg->Package.Elements[i]; |
| if (ref->Type != ACPI_TYPE_LOCAL_REFERENCE) { |
| zxlogf(TRACE, "acpi: Ignoring wrong type 0x%x", ref->Type); |
| } else { |
| zxlogf(TRACE, "acpi: Enabling HID controller at I2C0.H00A._PR0[%u]", i); |
| acpi_status = AcpiEvaluateObject(ref->Reference.Handle, (char*)"_ON", nullptr, nullptr); |
| if (acpi_status != AE_OK) { |
| zxlogf(ERROR, "acpi: acpi error 0x%x in I2C0._PR0._ON", acpi_status); |
| } |
| } |
| } |
| AcpiOsFree(buffer.Pointer); |
| } |
| } |
| // Acer workaround: Turn on the HID controller. |
| else if (!memcmp(&info->Name, "I2C1", 4)) { |
| zxlogf(TRACE, "acpi: Enabling HID controller at I2C1"); |
| acpi_status = AcpiEvaluateObject(object, (char*)"_PS0", nullptr, nullptr); |
| if (acpi_status != AE_OK) { |
| zxlogf(ERROR, "acpi: acpi error in I2C1._PS0: 0x%x", acpi_status); |
| } |
| } |
| } |
| |
| ACPI_STATUS AcpiWalker::OnDescent(ACPI_HANDLE object) { |
| ACPI_DEVICE_INFO* info_rawptr = nullptr; |
| ACPI_STATUS acpi_status = AcpiGetObjectInfo(object, &info_rawptr); |
| auto acpi_free = [](auto mem) { ACPI_FREE(mem); }; |
| std::unique_ptr<ACPI_DEVICE_INFO, decltype(acpi_free)> info{info_rawptr, acpi_free}; |
| if (acpi_status != AE_OK) { |
| return acpi_status; |
| } |
| |
| acpi_apply_workarounds(object, info.get()); |
| if (!memcmp(&info->Name, "HDAS", 4)) { |
| // We must have already seen at least one PCI root due to traversal order. |
| if (last_pci_ == kNoLastPci) { |
| zxlogf(ERROR, "acpi: Found HDAS node, but no prior PCI root was discovered!"); |
| } else if (!(info->Valid & ACPI_VALID_ADR)) { |
| zxlogf(ERROR, "acpi: no valid ADR found for HDA device"); |
| } else { |
| // Attaching metadata to the HDAS device /dev/sys/pci/... |
| zx_status_t status = |
| nhlt_publish_metadata(sys_root_, last_pci_, (uint64_t)info->Address, object); |
| if ((status != ZX_OK) && (status != ZX_ERR_NOT_FOUND)) { |
| zxlogf(ERROR, "acpi: failed to publish NHLT metadata"); |
| } |
| } |
| } |
| |
| const char* hid = hid_from_acpi_devinfo(info.get()); |
| if (hid == nullptr) { |
| return AE_OK; |
| } |
| const char* cid = nullptr; |
| if ((info->Valid & ACPI_VALID_CID) && (info->CompatibleIdList.Count > 0) && |
| // IDs may be 7 or 8 bytes, and Length includes the null byte |
| (info->CompatibleIdList.Ids[0].Length == HID_LENGTH || |
| info->CompatibleIdList.Ids[0].Length == HID_LENGTH + 1)) { |
| cid = (const char*)info->CompatibleIdList.Ids[0].String; |
| } |
| |
| if ((!memcmp(hid, PCI_EXPRESS_ROOT_HID_STRING, HID_LENGTH) || |
| !memcmp(hid, PCI_ROOT_HID_STRING, HID_LENGTH))) { |
| pci_init(sys_root_, object, info.get(), this); |
| } else if (!memcmp(hid, BATTERY_HID_STRING, HID_LENGTH)) { |
| battery_init(acpi_root_, object); |
| } else if (!memcmp(hid, LID_HID_STRING, HID_LENGTH)) { |
| lid_init(acpi_root_, object); |
| } else if (!memcmp(hid, PWRSRC_HID_STRING, HID_LENGTH)) { |
| pwrsrc_init(acpi_root_, object); |
| } else if (!memcmp(hid, EC_HID_STRING, HID_LENGTH)) { |
| ec_init(acpi_root_, object); |
| } else if (!memcmp(hid, GOOGLE_TBMC_HID_STRING, HID_LENGTH)) { |
| tbmc_init(acpi_root_, object); |
| } else if (!memcmp(hid, GOOGLE_CROS_EC_HID_STRING, HID_LENGTH)) { |
| cros_ec_lpc_init(acpi_root_, object); |
| } else if (!memcmp(hid, DPTF_THERMAL_HID_STRING, HID_LENGTH)) { |
| thermal_init(acpi_root_, info.get(), object); |
| } else if (!memcmp(hid, I8042_HID_STRING, HID_LENGTH) || |
| (cid && !memcmp(cid, I8042_HID_STRING, HID_LENGTH))) { |
| PublishAcpiDevice("i8042", object, info.get()); |
| } else if (!memcmp(hid, RTC_HID_STRING, HID_LENGTH) || |
| (cid && !memcmp(cid, RTC_HID_STRING, HID_LENGTH))) { |
| PublishAcpiDevice("rtc", object, info.get()); |
| } else if (!memcmp(hid, GOLDFISH_PIPE_HID_STRING, HID_LENGTH)) { |
| PublishAcpiDevice("goldfish", object, info.get()); |
| } else if (!memcmp(hid, SERIAL_HID_STRING, HID_LENGTH)) { |
| PublishAcpiDevice("serial", object, info.get()); |
| } |
| return AE_OK; |
| } |
| |
| zx_status_t acpi_suspend(uint8_t requested_state, bool enable_wake, uint8_t suspend_reason, |
| uint8_t* out_state) { |
| switch (suspend_reason & DEVICE_MASK_SUSPEND_REASON) { |
| case DEVICE_SUSPEND_REASON_MEXEC: { |
| AcpiTerminate(); |
| return ZX_OK; |
| } |
| case DEVICE_SUSPEND_REASON_REBOOT: |
| if (suspend_reason == DEVICE_SUSPEND_REASON_REBOOT_BOOTLOADER) { |
| reboot_bootloader(); |
| } else if (suspend_reason == DEVICE_SUSPEND_REASON_REBOOT_RECOVERY) { |
| reboot_recovery(); |
| } else { |
| reboot(); |
| } |
| // Kill this driver so that the IPC channel gets closed; devmgr will |
| // perform a fallback that should shutdown or reboot the machine. |
| exit(0); |
| case DEVICE_SUSPEND_REASON_POWEROFF: |
| poweroff(); |
| exit(0); |
| case DEVICE_SUSPEND_REASON_SUSPEND_RAM: |
| return suspend_to_ram(); |
| default: |
| return ZX_ERR_NOT_SUPPORTED; |
| }; |
| } |
| |
| zx_status_t publish_acpi_devices(zx_device_t* parent, zx_device_t* sys_root, |
| zx_device_t* acpi_root_) { |
| zx_status_t status = pwrbtn_init(acpi_root_); |
| if (status != ZX_OK) { |
| zxlogf(ERROR, "acpi: failed to initialize pwrbtn device: %d", status); |
| } |
| |
| // Walk the ACPI namespace for devices and publish them |
| // Only publish a single PCI device |
| AcpiWalker walker{sys_root, acpi_root_, parent}; |
| ACPI_STATUS acpi_status = AcpiWalkNamespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT, |
| MAX_NAMESPACE_DEPTH, &AcpiWalker::OnDescentCallback, |
| &AcpiWalker::OnAscentCallback, &walker, nullptr); |
| if (acpi_status != AE_OK) { |
| return ZX_ERR_BAD_STATE; |
| } else { |
| return ZX_OK; |
| } |
| } |
