cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

fsm.c (4136B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * finite state machine implementation
      4 *
      5 * Author       Karsten Keil <kkeil@novell.com>
      6 *
      7 * Thanks to    Jan den Ouden
      8 *              Fritz Elfert
      9 * Copyright 2008  by Karsten Keil <kkeil@novell.com>
     10 */
     11
     12#include <linux/kernel.h>
     13#include <linux/slab.h>
     14#include <linux/module.h>
     15#include <linux/string.h>
     16#include "fsm.h"
     17
     18#define FSM_TIMER_DEBUG 0
     19
     20int
     21mISDN_FsmNew(struct Fsm *fsm,
     22	     struct FsmNode *fnlist, int fncount)
     23{
     24	int i;
     25
     26	fsm->jumpmatrix =
     27		kzalloc(array3_size(sizeof(FSMFNPTR), fsm->state_count,
     28				    fsm->event_count),
     29			GFP_KERNEL);
     30	if (fsm->jumpmatrix == NULL)
     31		return -ENOMEM;
     32
     33	for (i = 0; i < fncount; i++)
     34		if ((fnlist[i].state >= fsm->state_count) ||
     35		    (fnlist[i].event >= fsm->event_count)) {
     36			printk(KERN_ERR
     37			       "mISDN_FsmNew Error: %d st(%ld/%ld) ev(%ld/%ld)\n",
     38			       i, (long)fnlist[i].state, (long)fsm->state_count,
     39			       (long)fnlist[i].event, (long)fsm->event_count);
     40		} else
     41			fsm->jumpmatrix[fsm->state_count * fnlist[i].event +
     42					fnlist[i].state] = (FSMFNPTR) fnlist[i].routine;
     43	return 0;
     44}
     45EXPORT_SYMBOL(mISDN_FsmNew);
     46
     47void
     48mISDN_FsmFree(struct Fsm *fsm)
     49{
     50	kfree((void *) fsm->jumpmatrix);
     51}
     52EXPORT_SYMBOL(mISDN_FsmFree);
     53
     54int
     55mISDN_FsmEvent(struct FsmInst *fi, int event, void *arg)
     56{
     57	FSMFNPTR r;
     58
     59	if ((fi->state >= fi->fsm->state_count) ||
     60	    (event >= fi->fsm->event_count)) {
     61		printk(KERN_ERR
     62		       "mISDN_FsmEvent Error st(%ld/%ld) ev(%d/%ld)\n",
     63		       (long)fi->state, (long)fi->fsm->state_count, event,
     64		       (long)fi->fsm->event_count);
     65		return 1;
     66	}
     67	r = fi->fsm->jumpmatrix[fi->fsm->state_count * event + fi->state];
     68	if (r) {
     69		if (fi->debug)
     70			fi->printdebug(fi, "State %s Event %s",
     71				       fi->fsm->strState[fi->state],
     72				       fi->fsm->strEvent[event]);
     73		r(fi, event, arg);
     74		return 0;
     75	} else {
     76		if (fi->debug)
     77			fi->printdebug(fi, "State %s Event %s no action",
     78				       fi->fsm->strState[fi->state],
     79				       fi->fsm->strEvent[event]);
     80		return 1;
     81	}
     82}
     83EXPORT_SYMBOL(mISDN_FsmEvent);
     84
     85void
     86mISDN_FsmChangeState(struct FsmInst *fi, int newstate)
     87{
     88	fi->state = newstate;
     89	if (fi->debug)
     90		fi->printdebug(fi, "ChangeState %s",
     91			       fi->fsm->strState[newstate]);
     92}
     93EXPORT_SYMBOL(mISDN_FsmChangeState);
     94
     95static void
     96FsmExpireTimer(struct timer_list *t)
     97{
     98	struct FsmTimer *ft = from_timer(ft, t, tl);
     99#if FSM_TIMER_DEBUG
    100	if (ft->fi->debug)
    101		ft->fi->printdebug(ft->fi, "FsmExpireTimer %lx", (long) ft);
    102#endif
    103	mISDN_FsmEvent(ft->fi, ft->event, ft->arg);
    104}
    105
    106void
    107mISDN_FsmInitTimer(struct FsmInst *fi, struct FsmTimer *ft)
    108{
    109	ft->fi = fi;
    110#if FSM_TIMER_DEBUG
    111	if (ft->fi->debug)
    112		ft->fi->printdebug(ft->fi, "mISDN_FsmInitTimer %lx", (long) ft);
    113#endif
    114	timer_setup(&ft->tl, FsmExpireTimer, 0);
    115}
    116EXPORT_SYMBOL(mISDN_FsmInitTimer);
    117
    118void
    119mISDN_FsmDelTimer(struct FsmTimer *ft, int where)
    120{
    121#if FSM_TIMER_DEBUG
    122	if (ft->fi->debug)
    123		ft->fi->printdebug(ft->fi, "mISDN_FsmDelTimer %lx %d",
    124				   (long) ft, where);
    125#endif
    126	del_timer(&ft->tl);
    127}
    128EXPORT_SYMBOL(mISDN_FsmDelTimer);
    129
    130int
    131mISDN_FsmAddTimer(struct FsmTimer *ft,
    132		  int millisec, int event, void *arg, int where)
    133{
    134
    135#if FSM_TIMER_DEBUG
    136	if (ft->fi->debug)
    137		ft->fi->printdebug(ft->fi, "mISDN_FsmAddTimer %lx %d %d",
    138				   (long) ft, millisec, where);
    139#endif
    140
    141	if (timer_pending(&ft->tl)) {
    142		if (ft->fi->debug) {
    143			printk(KERN_WARNING
    144			       "mISDN_FsmAddTimer: timer already active!\n");
    145			ft->fi->printdebug(ft->fi,
    146					   "mISDN_FsmAddTimer already active!");
    147		}
    148		return -1;
    149	}
    150	ft->event = event;
    151	ft->arg = arg;
    152	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
    153	add_timer(&ft->tl);
    154	return 0;
    155}
    156EXPORT_SYMBOL(mISDN_FsmAddTimer);
    157
    158void
    159mISDN_FsmRestartTimer(struct FsmTimer *ft,
    160		      int millisec, int event, void *arg, int where)
    161{
    162
    163#if FSM_TIMER_DEBUG
    164	if (ft->fi->debug)
    165		ft->fi->printdebug(ft->fi, "mISDN_FsmRestartTimer %lx %d %d",
    166				   (long) ft, millisec, where);
    167#endif
    168
    169	if (timer_pending(&ft->tl))
    170		del_timer(&ft->tl);
    171	ft->event = event;
    172	ft->arg = arg;
    173	ft->tl.expires = jiffies + (millisec * HZ) / 1000;
    174	add_timer(&ft->tl);
    175}
    176EXPORT_SYMBOL(mISDN_FsmRestartTimer);