doc: move kernel services under kernel

Move all kernel documentation under kernel/services.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

doc/kernel/index.rst

@@ -1,127 +1,10 @@
-.. _kernel_api:
+.. _kernel:
 
-The Zephyr Kernel
-#################
-
-The Zephyr kernel lies at the heart of every Zephyr application. It provides
-a low footprint, high performance, multi-threaded execution environment
-with a rich set of available features. The rest of the Zephyr ecosystem,
-including device drivers, networking stack, and application-specific code,
-uses the kernel's features to create a complete application.
-
-The configurable nature of the kernel allows you to incorporate only those
-features needed by your application, making it ideal for systems with limited
-amounts of memory (as little as 2 KB!) or with simple multi-threading
-requirements (such as a set of interrupt handlers and a single background task).
-Examples of such systems include: embedded sensor hubs, environmental sensors,
-simple LED wearable, and store inventory tags.
-
-Applications requiring more memory (50 to 900 KB), multiple communication
-devices (like Wi-Fi and Bluetooth Low Energy), and complex multi-threading,
-can also be developed using the Zephyr kernel. Examples of such systems
-include: fitness wearables, smart watches, and IoT wireless gateways.
-
-Scheduling, Interrupts, and Synchronization
-*******************************************
-
-These pages cover basic kernel services related to thread scheduling and
-synchronization.
+Kernel
+######
 
 .. toctree::
    :maxdepth: 1
 
-   threads/index.rst
-   scheduling/index.rst
-   threads/system_threads.rst
-   threads/workqueue.rst
-   threads/nothread.rst
-   interrupts.rst
-   polling.rst
-   synchronization/semaphores.rst
-   synchronization/mutexes.rst
-   synchronization/condvar.rst
-   synchronization/events.rst
-   smp/smp.rst
-
-.. _kernel_data_passing_api:
-
-Data Passing
-************
-
-These pages cover kernel objects which can be used to pass data between
-threads and ISRs.
-
-The following table summarizes their high-level features.
-
-===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
-Object            Bidirectional?      Data structure         Data item size      Data Alignment   ISRs can receive?  ISRs can send?  Overrun handling
-===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
-FIFO              No                  Queue                  Arbitrary [1]              4 B [2]   Yes [3]            Yes             N/A
-LIFO              No                  Queue                  Arbitrary [1]              4 B [2]   Yes [3]            Yes             N/A
-Stack             No                  Array                  Word                          Word   Yes [3]            Yes             Undefined behavior
-Message queue     No                  Ring buffer            Power of two          Power of two   Yes [3]            Yes             Pend thread or return -errno
-Mailbox           Yes                 Queue                  Arbitrary [1]            Arbitrary   No                 No              N/A
-Pipe              No                  Ring buffer [4]        Arbitrary                Arbitrary   No                 No              Pend thread or return -errno
-===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
-
-[1] Callers allocate space for queue overhead in the data
-elements themselves.
-
-[2] Objects added with k_fifo_alloc_put() and k_lifo_alloc_put()
-do not have alignment constraints, but use temporary memory from the
-calling thread's resource pool.
-
-[3] ISRs can receive only when passing K_NO_WAIT as the timeout
-argument.
-
-[4] Optional.
-
-.. toctree::
-   :maxdepth: 1
-
-   data_passing/queues.rst
-   data_passing/fifos.rst
-   data_passing/lifos.rst
-   data_passing/stacks.rst
-   data_passing/message_queues.rst
-   data_passing/mailboxes.rst
-   data_passing/pipes.rst
-
-.. _kernel_memory_management_api:
-
-Memory Management
-*****************
-
-These pages cover memory allocation and management services.
-
-.. toctree::
-   :maxdepth: 1
-
-   memory/heap.rst
-   memory/slabs.rst
-
-Timing
-******
-
-These pages cover timing related services.
-
-.. toctree::
-   :maxdepth: 1
-
-   timing/clocks.rst
-   timing/timers.rst
-
-Other
-*****
-
-These pages cover other kernel services.
-
-.. toctree::
-   :maxdepth: 1
-
-   other/atomic.rst
-   other/float.rst
-   other/cxx_support.rst
-   other/version.rst
-   other/fatal.rst
-   other/thread_local_storage.rst
+   services/index.rst
+   drivers/index.rst

doc/kernel/services/index.rst

@@ -0,0 +1,127 @@
+.. _kernel_api:
+
+Kernel Services
+###############
+
+The Zephyr kernel lies at the heart of every Zephyr application. It provides
+a low footprint, high performance, multi-threaded execution environment
+with a rich set of available features. The rest of the Zephyr ecosystem,
+including device drivers, networking stack, and application-specific code,
+uses the kernel's features to create a complete application.
+
+The configurable nature of the kernel allows you to incorporate only those
+features needed by your application, making it ideal for systems with limited
+amounts of memory (as little as 2 KB!) or with simple multi-threading
+requirements (such as a set of interrupt handlers and a single background task).
+Examples of such systems include: embedded sensor hubs, environmental sensors,
+simple LED wearable, and store inventory tags.
+
+Applications requiring more memory (50 to 900 KB), multiple communication
+devices (like Wi-Fi and Bluetooth Low Energy), and complex multi-threading,
+can also be developed using the Zephyr kernel. Examples of such systems
+include: fitness wearables, smart watches, and IoT wireless gateways.
+
+Scheduling, Interrupts, and Synchronization
+*******************************************
+
+These pages cover basic kernel services related to thread scheduling and
+synchronization.
+
+.. toctree::
+   :maxdepth: 1
+
+   threads/index.rst
+   scheduling/index.rst
+   threads/system_threads.rst
+   threads/workqueue.rst
+   threads/nothread.rst
+   interrupts.rst
+   polling.rst
+   synchronization/semaphores.rst
+   synchronization/mutexes.rst
+   synchronization/condvar.rst
+   synchronization/events.rst
+   smp/smp.rst
+
+.. _kernel_data_passing_api:
+
+Data Passing
+************
+
+These pages cover kernel objects which can be used to pass data between
+threads and ISRs.
+
+The following table summarizes their high-level features.
+
+===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
+Object            Bidirectional?      Data structure         Data item size      Data Alignment   ISRs can receive?  ISRs can send?  Overrun handling
+===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
+FIFO              No                  Queue                  Arbitrary [1]              4 B [2]   Yes [3]            Yes             N/A
+LIFO              No                  Queue                  Arbitrary [1]              4 B [2]   Yes [3]            Yes             N/A
+Stack             No                  Array                  Word                          Word   Yes [3]            Yes             Undefined behavior
+Message queue     No                  Ring buffer            Power of two          Power of two   Yes [3]            Yes             Pend thread or return -errno
+Mailbox           Yes                 Queue                  Arbitrary [1]            Arbitrary   No                 No              N/A
+Pipe              No                  Ring buffer [4]        Arbitrary                Arbitrary   No                 No              Pend thread or return -errno
+===============   ==============      ===================    ==============      ==============   =================  ==============  ===============================
+
+[1] Callers allocate space for queue overhead in the data
+elements themselves.
+
+[2] Objects added with k_fifo_alloc_put() and k_lifo_alloc_put()
+do not have alignment constraints, but use temporary memory from the
+calling thread's resource pool.
+
+[3] ISRs can receive only when passing K_NO_WAIT as the timeout
+argument.
+
+[4] Optional.
+
+.. toctree::
+   :maxdepth: 1
+
+   data_passing/queues.rst
+   data_passing/fifos.rst
+   data_passing/lifos.rst
+   data_passing/stacks.rst
+   data_passing/message_queues.rst
+   data_passing/mailboxes.rst
+   data_passing/pipes.rst
+
+.. _kernel_memory_management_api:
+
+Memory Management
+*****************
+
+These pages cover memory allocation and management services.
+
+.. toctree::
+   :maxdepth: 1
+
+   memory/heap.rst
+   memory/slabs.rst
+
+Timing
+******
+
+These pages cover timing related services.
+
+.. toctree::
+   :maxdepth: 1
+
+   timing/clocks.rst
+   timing/timers.rst
+
+Other
+*****
+
+These pages cover other kernel services.
+
+.. toctree::
+   :maxdepth: 1
+
+   other/atomic.rst
+   other/float.rst
+   other/cxx_support.rst
+   other/version.rst
+   other/fatal.rst
+   other/thread_local_storage.rst

doc/reference/index.rst

@@ -13,7 +13,6 @@ API Reference
    canbus/index.rst
    crypto/index.rst
    devicetree/index.rst
-   drivers/index.rst
    display/index.rst
    edac/index.rst
    file_system/index.rst