toaruos/modules/random.c

73 lines
1.8 KiB
C

/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2014-2018 K. Lange
*
* Provides access to the kernel RNG
*
*/
#include <kernel/system.h>
#include <kernel/logging.h>
#include <kernel/fs.h>
#include <kernel/module.h>
static uint32_t read_random(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
static uint32_t write_random(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer);
static void open_random(fs_node_t *node, unsigned int flags);
static void close_random(fs_node_t *node);
static uint32_t read_random(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
uint32_t s = 0;
while (s < size) {
buffer[s] = krand() % 0xFF;
offset++;
s++;
}
return size;
}
static uint32_t write_random(fs_node_t *node, uint32_t offset, uint32_t size, uint8_t *buffer) {
return size;
}
static void open_random(fs_node_t * node, unsigned int flags) {
return;
}
static void close_random(fs_node_t * node) {
return;
}
static fs_node_t * random_device_create(void) {
fs_node_t * fnode = malloc(sizeof(fs_node_t));
memset(fnode, 0x00, sizeof(fs_node_t));
fnode->inode = 0;
strcpy(fnode->name, "random");
fnode->uid = 0;
fnode->gid = 0;
fnode->mask = 0444;
fnode->length = 1024;
fnode->flags = FS_CHARDEVICE;
fnode->read = read_random;
fnode->write = write_random;
fnode->open = open_random;
fnode->close = close_random;
fnode->readdir = NULL;
fnode->finddir = NULL;
fnode->ioctl = NULL;
return fnode;
}
static int random_initialize(void) {
vfs_mount("/dev/random", random_device_create());
vfs_mount("/dev/urandom", random_device_create());
return 0;
}
static int random_finalize(void) {
return 0;
}
MODULE_DEF(random, random_initialize, random_finalize);