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Diffstat (limited to 'en/devices/architecture/hal-types.html')
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1 files changed, 17 insertions, 16 deletions
diff --git a/en/devices/architecture/hal-types.html b/en/devices/architecture/hal-types.html index 52cb869f..3df8d61c 100644 --- a/en/devices/architecture/hal-types.html +++ b/en/devices/architecture/hal-types.html @@ -21,19 +21,20 @@ limitations under the License. --> -<p>As part of the Android O rearchitecture of the lower layers of the Android OS -to support better modularity, devices running Android O must support binderized +<p>As part of the Android 8.0 rearchitecture of the lower layers of the Android OS +to support better modularity, devices running Android 8.0 must support binderized or passthrough HALs:</p> <ul> <li><strong>Binderized HALs</strong>. HALs expressed in HAL interface definition -language (HIDL). These HALs replace both conventional and legacy HALs used in -earlier versions of Android and can serve the HAL in binderized mode. All -devices launching with Android O or later must support binderized HALs only.</li> +language (HIDL). These HALs replace both conventional and legacy HALs used in earlier versions of +Android. In a Binderized HAL, the Android framework and HALs communicate with each other using +binder inter-process communication (IPC) calls. All devices launching with Android 8.0 or later must +support binderized HALs only.</li> <li><strong>Passthrough HALs</strong>. A HIDL-wrapped conventional or legacy HAL. These HALs wrap existing HALs and can serve the HAL in binderized and -same-process (passthrough) modes. Devices upgrading to Android O can use +same-process (passthrough) modes. Devices upgrading to Android 8.0 can use passthrough HALs.</li> </ul> @@ -49,7 +50,7 @@ passthrough HALs.</li> </tr> <tr> -<td><em>Launch with Android O</em></td> +<td><em>Launch with Android 8.0</em></td> <td>HALs listed in <a href="#passthrough">Passthrough HALs</a> must be passthrough.</td> <td>All other HALs are binderized (including HALs that are vendor @@ -57,7 +58,7 @@ extensions).</td> </tr> <tr> -<td rowspan=2><em>Upgrade to Android O</em></td> +<td rowspan=2><em>Upgrade to Android 8.0</em></td> <td>HALs listed in <a href="#passthrough">Passthrough HALs</a> must be passthrough.</td> <td>HALs listed in <a href="#binderized">Binderized HALs</a> must be @@ -78,19 +79,19 @@ devices regardless of whether they are launch devices or upgrade devices:</p> <ul> <li><code>android.hardware.biometrics.fingerprint@2.1</code>. Replaces -<code>fingerprintd</code> which is no longer in Android O.</li> -<li><code>android.hardware.configstore@1.0</code>. New in Android O.</li> +<code>fingerprintd</code> which is no longer in Android 8.0.</li> +<li><code>android.hardware.configstore@1.0</code>. New in Android 8.0.</li> <li><code>android.hardware.dumpstate@1.0</code>. The original interface provided by this HAL could not be shimmed and was changed. Because of this, <code>dumpstate_board</code> must be re-implemented on a given device (this is an optional HAL).</li> <li><code>android.hardware.graphics.allocator@2.0</code>. Required to be -binderized in Android O so file descriptors don't have to be shared between +binderized in Android 8.0 so file descriptors don't have to be shared between trusted and untrusted processes.</li> <li><code>android.hardware.radio@1.0</code>. Replaces the interface provided by <code>rild</code> which lives in its own process.</li> -<li><code>android.hardware.usb@1.0</code>. New in Android O.</li> -<li><code>android.hardware.wifi@1.0</code>. New in Android O, replaces the +<li><code>android.hardware.usb@1.0</code>. New in Android 8.0.</li> +<li><code>android.hardware.wifi@1.0</code>. New in Android 8.0, replaces the legacy Wi-Fi HAL library that was loaded into <code>system_server</code>.</li> <li><code>android.hardware.wifi.supplicant@1.0</code>. A HIDL interface over the existing <code>wpa_supplicant</code> process.</li> @@ -133,7 +134,7 @@ passthrough)</li> <h2 id=legacy>Conventional & legacy HALs</h2> -<p>Conventional HALs (deprecated in Android O) are interfaces that conform to a +<p>Conventional HALs (deprecated in Android 8.0) are interfaces that conform to a specific named and versioned application binary interface (ABI). The bulk of Android system interfaces (<a href="https://android.googlesource.com/platform/hardware/libhardware/+/master/include/hardware/camera3.h">camera</a>, @@ -142,10 +143,10 @@ Android system interfaces etc.) are in the form of conventional HALs, which are defined under <a href="https://android.googlesource.com/platform/hardware/libhardware/+/master/include/hardware">hardware/libhardware/include/hardware</a>.</p> -<p>Legacy HALs (also deprecated in Android O) are interfaces that predate +<p>Legacy HALs (also deprecated in Android 8.0) are interfaces that predate conventional HALs. A few important subsystems (Wi-Fi, Radio Interface Layer, and Bluetooth) are legacy HALs. While there's no uniform or standardized way to -describe a legacy HAL, anything predating Android O that is not a conventional +describe a legacy HAL, anything predating Android 8.0 that is not a conventional HAL is a legacy HAL. Parts of some legacy HALs are contained in <a href="https://android.googlesource.com/platform/hardware/libhardware_legacy/+/master">libhardware_legacy</a>, while other parts are interspersed throughout the codebase.</p> |