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Documentation of kernel API

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Kyle J Cardoza 2024-07-09 11:55:22 -04:00
parent 4582df8946
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doc/syscalls.md
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@ -470,10 +470,22 @@ Argument Structure:
};
```
Device drivers in 65X-DOS identify themselves to the kernel by
means of their "major number" -- the index into the internal
device driver table at which the device driver's address can
be found. Specific devices managed by a driver are distinguished
from each other by "minor number" -- an arbitrary number which
holds meaning only to the driver.
Each device driver in 65X-DOS registers one or more major/minor
number pairs to one or more "default" aliases. These aliases are
number pairs to one or more "default" names. These aliases are
what appear in a fully qualified pathname for a file before the
`:` separator character.
`:` separator character. You might compare this to a "drive letter"
in MS-DOS type systems, or to entries in the `/dev` directory on
a Unix-like system. For example, the SD card driver might register
the device name `sd0` for the first SD card. Drivers which do not
expose file-like functionality still expose default names, because
they use the `ioctl` interface to control their settings.
This call attempts to add a secondary name to an existing device.
This alias will work exactly like the default name, which will still