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Kernel: Implemented banos - a WIP C driver API

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Banos is a stable WIP C driver API that is supposed to provide a simple
interface to interact with the kernel and load the modules dynamically.
It is WIP and atm this just implements module loading with a custom
banos_install syscall. Banos will not try to substitute parts of the
kernel instead it will just expose kernel functionality via a stable
BINARY API. Meaning binaries (should) remain forward and backward
compatible on a binary level.

Banos modules work similarly to those in linux, you expose symbols via
BANOS_EXPORT which allows you to export a name + addr paired symbol.
It puts it in the .banos-export section. Drivers provide metadata about
themselves in the REQUIRED .banos-driver section. Symbols are resolved
at runtime. The kernel exposes the driver functionality via the same
.banos-export export mechanism.

Banos modules are elf RELOCATABLE files (object files) which have
partial linking (only banos symbols should remain). Modules will
eventually define dependencies, will export symbols and will allow you
to build a complex object hierarchy.

This patch adds the banos_install syscall which takes in the driver
image to install and may only be executed by super users. The API
doesn't validate already loaded modules, as thats something the
userspace MAY choose to keep track of. Multi-instance functionality
shall be implemented via driver specific behaviuor (exposed in the dev
filesystem or some other means).

Modules are supposed to allow you to alter kernel behavior and extend
it, allowing you to create filesystems, drivers, networking
modifications, schedulers, probers, and more (hopefully) whilst
remaining binary compatible with any version of the kernel (again,
hopefully).
This commit is contained in:
DcraftBg
2026-05-20 17:24:36 +03:00
committed by Bananymous
parent 718379ce3b
commit f1a72cc9da
13 changed files with 332 additions and 0 deletions
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27
kernel/include/banos/driver.h Normal file
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#pragma once
// Copyright (c) 2026 Dcraftbg
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#include "version.h"
#include "revision.h"
#define BANOS_DRIVER_REVISION_CURRENT 0
typedef struct Banos_Driver Banos_Driver;
struct Banos_Driver {
unsigned long driver_size;
banos_version_t minimal_banos_version;
const char* name;
const char* license;
banos_version_t version;
// NOTE: checkout BANOS_DRIVER_INSTANCE_SIZE.
// You may use this instance data for anything you wish to store.
// If you need more than that just allocate it on the heap or
// globally if you add the proper verification of having your driver run only
// within a single instance
int (*init)(Banos_Driver* drv);
int (*uninit)(Banos_Driver* drv);
};
#define BANOS_DRIVER_API static __attribute__((section(".banos-driver"), used, aligned(8)))