67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
|
/* vim: tabstop=4 shiftwidth=4 noexpandtab
|
||
|
|
* Provides access to the kernel RNG
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <system.h>
|
||
|
|
#include <logging.h>
|
||
|
|
#include <fs.h>
|
||
|
|
|
||
|
|
#include <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->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());
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int random_finalize(void) {
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
MODULE_DEF(random, random_initialize, random_finalize);
|