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+.. SPDX-License-Identifier: GPL-2.0
+
+==============================
+Kernel subsystem documentation
+==============================
+
+These books get into the details of how specific kernel subsystems work
+from the point of view of a kernel developer.  Much of the information here
+is taken directly from the kernel source, with supplemental material added
+as needed (or at least as we managed to add it — probably *not* all that is
+needed).
+
+Core subsystems
+---------------
+
+.. toctree::
+   :maxdepth: 1
+
+   core-api/index
+   driver-api/index
+   mm/index
+   power/index
+   scheduler/index
+   timers/index
+   locking/index
+
+Human interfaces
+----------------
+
+.. toctree::
+   :maxdepth: 1
+
+   input/index
+   hid/index
+   sound/index
+   gpu/index
+   fb/index
+   leds/index
+
+Networking interfaces
+---------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   networking/index
+   netlabel/index
+   infiniband/index
+   isdn/index
+   mhi/index
+
+Storage interfaces
+------------------
+
+.. toctree::
+   :maxdepth: 1
+
+   filesystems/index
+   block/index
+   cdrom/index
+   scsi/index
+   target/index
+
+Other subsystems
+----------------
+**Fixme**: much more organizational work is needed here.
+
+.. toctree::
+   :maxdepth: 1
+
+   accounting/index
+   cpu-freq/index
+   fpga/index
+   i2c/index
+   iio/index
+   pcmcia/index
+   spi/index
+   w1/index
+   watchdog/index
+   virt/index
+   hwmon/index
+   accel/index
+   security/index
+   crypto/index
+   bpf/index
+   usb/index
+   PCI/index
+   misc-devices/index
+   peci/index
+   wmi/index
+   tee/index