Commit 25b9cadb authored by Elizabeth Figura's avatar Elizabeth Figura Committed by Greg Kroah-Hartman
Browse files

ntsync: Introduce the ntsync driver and character device. 



ntsync uses a misc device as the simplest and least intrusive uAPI interface.

Each file description on the device represents an isolated NT instance, intended
to correspond to a single NT virtual machine.

Signed-off-by: default avatarElizabeth Figura <zfigura@codeweavers.com>
Link: https://lore.kernel.org/r/20240329000621.148791-2-zfigura@codeweavers.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 26f0d3b1

drivers/misc/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -506,6 +506,17 @@ config OPEN_DICE 


	  If unsure, say N.



config NTSYNC

	tristate "NT synchronization primitive emulation"

	help

	  This module provides kernel support for emulation of Windows NT

	  synchronization primitives. It is not a hardware driver.



	  To compile this driver as a module, choose M here: the

	  module will be called ntsync.



	  If unsure, say N.



config VCPU_STALL_DETECTOR

	tristate "Guest vCPU stall detector"

	depends on OF && HAS_IOMEM

drivers/misc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ obj-$(CONFIG_PVPANIC) += pvpanic/ 
obj-$(CONFIG_UACCE)		+= uacce/

obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o

obj-$(CONFIG_HISI_HIKEY_USB)	+= hisi_hikey_usb.o

obj-$(CONFIG_NTSYNC)		+= ntsync.o

obj-$(CONFIG_HI6421V600_IRQ)	+= hi6421v600-irq.o

obj-$(CONFIG_OPEN_DICE)		+= open-dice.o

obj-$(CONFIG_GP_PCI1XXXX)	+= mchp_pci1xxxx/

drivers/misc/ntsync.c

0 → 100644
+52 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only

/*

 * ntsync.c - Kernel driver for NT synchronization primitives

 *

 * Copyright (C) 2024 Elizabeth Figura <zfigura@codeweavers.com>

 */



#include <linux/fs.h>

#include <linux/miscdevice.h>

#include <linux/module.h>



#define NTSYNC_NAME	"ntsync"



static int ntsync_char_open(struct inode *inode, struct file *file)

{

	return nonseekable_open(inode, file);

}



static int ntsync_char_release(struct inode *inode, struct file *file)

{

	return 0;

}



static long ntsync_char_ioctl(struct file *file, unsigned int cmd,

			      unsigned long parm)

{

	switch (cmd) {

	default:

		return -ENOIOCTLCMD;

	}

}



static const struct file_operations ntsync_fops = {

	.owner		= THIS_MODULE,

	.open		= ntsync_char_open,

	.release	= ntsync_char_release,

	.unlocked_ioctl	= ntsync_char_ioctl,

	.compat_ioctl	= compat_ptr_ioctl,

	.llseek		= no_llseek,

};



static struct miscdevice ntsync_misc = {

	.minor		= MISC_DYNAMIC_MINOR,

	.name		= NTSYNC_NAME,

	.fops		= &ntsync_fops,

};



module_misc_device(ntsync_misc);



MODULE_AUTHOR("Elizabeth Figura <zfigura@codeweavers.com>");

MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");

MODULE_LICENSE("GPL");