/*
* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org)
* Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/list.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/sched/debug.h>
#include <linux/proc_fs.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
#include <linux/utsname.h>
#include <linux/socket.h>
#include <linux/un.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/file.h>
#include <linux/uaccess.h>
#include <asm/switch_to.h>
#include <init.h>
#include <irq_kern.h>
#include <irq_user.h>
#include <kern_util.h>
#include "mconsole.h"
#include "mconsole_kern.h"
#include <os.h>
static int do_unlink_socket(struct notifier_block *notifier,
unsigned long what, void *data)
{
return mconsole_unlink_socket();
}
static struct notifier_block reboot_notifier = {
.notifier_call = do_unlink_socket,
.priority = 0,
};
/* Safe without explicit locking for now. Tasklets provide their own
* locking, and the interrupt handler is safe because it can't interrupt
* itself and it can only happen on CPU 0.
*/
static LIST_HEAD(mc_requests);
static void mc_work_proc(struct work_struct *unused)
{
struct mconsole_entry *req;
unsigned long flags;
while (!list_empty(&mc_requests)) {
local_irq_save(flags);
req = list_entry(mc_requests.next, struct mconsole_entry, list);
list_del(&req->list);
local_irq_restore(flags);
req->request.cmd->handler(&req->request);
kfree(req);
}
}
static DECLARE_WORK(mconsole_work, mc_work_proc);
static irqreturn_t mconsole_interrupt(int irq, void *dev_id)
{
/* long to avoid size mismatch warnings from gcc */
long fd;
struct mconsole_entry *new;
static struct mc_request req; /* that's OK */
fd = (long) dev_id;
while (mconsole_get_request(fd, &req)) {
if (req.cmd->context == MCONSOLE_INTR)
(*req.cmd->handler)(&req);
else {
new = kmalloc(sizeof(*new), GFP_NOWAIT);
if (new == NULL)
mconsole_reply(&req, "Out of memory", 1, 0);
else {
new->request = req;
new->request.regs = get_irq_regs()->regs;
list_add(&new->list, &mc_requests);
}
}
}
if (!list_empty(&mc_requests))
schedule_work(&mconsole_work);
return IRQ_HANDLED;
}
void mconsole_version(struct mc_request *req)
{
char version[256];
sprintf(version, "%s %s %s %s %s", utsname()->sysname,
utsname()->nodename, utsname()->release, utsname()->version,
utsname()->machine);
mconsole_reply(req, version, 0, 0);
}
void mconsole_log(struct mc_request *req)
{
int len;
char *ptr = req->request.data;
ptr += strlen("log ");
len = req->len - (ptr - req->request.data);
printk(KERN_WARNING "%.*s", len, ptr);
mconsole_reply(req, "", 0, 0);
}
void mconsole_proc(struct mc_request *req)
{
struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
char *buf;
int len;
struct file *file;
int first_chunk = 1;
char *ptr = req->request.data;
loff_t pos = 0;
ptr += strlen("proc");
ptr = skip_spaces(ptr);
file = file_open_root(mnt->mnt_root, mnt, ptr, O_RDONLY, 0);
if (IS_ERR(file)) {
mconsole_reply(req, "Failed to open file", 1, 0);
printk(KERN_ERR "open /proc/%s: %ld\n", ptr, PTR_ERR(file));
goto out;
}
buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
if (buf == NULL) {
mconsole_reply(req, "Failed to allocate buffer", 1, 0);
goto out_fput;
}
do {
len = kernel_read(file, buf, PAGE_SIZE - 1, &pos);
if (len < 0) {
mconsole_reply(req, "Read of file failed", 1, 0);
goto out_free;
}
/* Begin the file content on his own line. */
if (first_chunk) {
mconsole_reply(req, "\n", 0, 1);
first_chunk = 0;
}
buf[len] = '\0';
mconsole_reply(req, buf, 0, (len > 0));
} while (len > 0);
out_free:
kfree(buf);
out_fput:
fput(file);
out: ;
}
#define UML_MCONSOLE_HELPTEXT \
"Commands: \n\
version - Get kernel version \n\
help - Print this message \n\
halt -