memdev.c File Reference

The memory devices: the character devices of major 1, as on Linux. More...

#include <core/system.h>
#include <core/module.h>
#include <dev/dev.h>
#include <memdev.h>

Go to the source code of this file.

Functions
struct dev *	memdev_mux (struct devid *dd)
	Picks the driver of a memory device, by its minor.
int	memdev_probe ()
	Registers the memory devices, as character devices of major 1.

Variables
struct dev	memdev

Detailed Description

The memory devices: the character devices of major 1, as on Linux.

Each minor is a device of its own, with its own driver: /dev/null (3), /dev/zero (5), /dev/random and /dev/urandom (8, 9) and /dev/kmsg (11). memdev_mux() picks the driver by minor. The other minors Linux has (/dev/mem, /dev/port, /dev/full, ...) aren't there.

Definition in file memdev.c.

Function Documentation

memdev_mux()

struct dev * memdev_mux

(

struct devid *

dd

)

Picks the driver of a memory device, by its minor.

Parameters

dd	the device's number

Returns

its driver, or NULL for a minor that has none

Definition at line 25 of file memdev.c.

References kmsgdev, memdev_mux(), devid::minor, NULL, nulldev, randomdev, and zerodev.

Referenced by memdev_mux().

memdev_probe()

int memdev_probe

(

)

Registers the memory devices, as character devices of major 1.

Returns

0

Definition at line 59 of file memdev.c.

References kdev_chrdev_register(), memdev, and memdev_probe().

Referenced by memdev_probe().

Variable Documentation

memdev

struct dev memdev

Initial value:

         = {
    .name = "memdev",
    .mux  = memdev_mux,
}

Definition at line 17 of file memdev.c.

Referenced by memdev_probe().