WebSVN - shark - Blame - Rev 1085 - /demos/branches/pj/cash/cash.c

Rev	Author	Line No.	Line
1085	pj	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Paolo Gai <pj@gandalf.sssup.it>
		10	* Massimiliano Giorgi <massy@gandalf.sssup.it>
		11	* Luca Abeni <luca@gandalf.sssup.it>
		12	* (see the web pages for full authors list)
		13	*
		14	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		15	*
		16	* http://www.sssup.it
		17	* http://retis.sssup.it
		18	* http://shark.sssup.it
		19	*/
		20
		21	/**
		22	------------
		23	CVS : $Id: cash.c,v 1.1.1.1 2002-09-02 09:37:41 pj Exp $
		24
		25	File: $File$
		26	Revision: $Revision: 1.1.1.1 $
		27	Last update: $Date: 2002-09-02 09:37:41 $
		28	------------
		29
		30	This file contains the aperiodic server CBS (Total Bandwidth Server)
		31
		32	Read CBS.h for further details.
		33
		34	**/
		35
		36	/*
		37	* Copyright (C) 2000 Paolo Gai
		38	*
		39	* This program is free software; you can redistribute it and/or modify
		40	* it under the terms of the GNU General Public License as published by
		41	* the Free Software Foundation; either version 2 of the License, or
		42	* (at your option) any later version.
		43	*
		44	* This program is distributed in the hope that it will be useful,
		45	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		46	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		47	* GNU General Public License for more details.
		48	*
		49	* You should have received a copy of the GNU General Public License
		50	* along with this program; if not, write to the Free Software
		51	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		52	*
		53	*/
		54
		55
		56	#include "cash.h"
		57	#include <ll/stdio.h>
		58	#include <ll/string.h>
		59	#include <kernel/model.h>
		60	#include <kernel/descr.h>
		61	#include <kernel/var.h>
		62	#include <kernel/func.h>
		63
		64	/+ 4 debug purposes +/
		65	#undef CBS_TEST
		66
		67	#ifdef TESTG
		68	#include "drivers/glib.h"
		69	TIME x,oldx;
		70	extern TIME starttime;
		71	#endif
		72
		73
		74
		75
		76
		77
		78	/+ Status used in the level +/
		79	#define CBSGHD_IDLE APER_STATUS_BASE /+ waiting the activation +/
		80	#define CBSGHD_ZOMBIE APER_STATUS_BASE+1 /+ waiting the period end +/
		81	#define CBSGHD_DELAY APER_STATUS_BASE+2 /+ waiting the delay end +/
		82
		83	/* structure of an element of the capacity queue */
		84	struct cap_queue {
		85	int cap;
		86	struct timespec dead;
		87	struct cap_queue *next;
		88	};
		89
		90	/+ the level redefinition for the CBS_HD level +/
		91	typedef struct {
		92	level_des l; /+ the standard level descriptor +/
		93
		94	/* The wcet are stored in the task descriptor, but we need
		95	an array for the deadlines. We can't use the timespec_priority
		96	field because it is used by the master level!!!...
		97	Notice that however the use of the timespec_priority field
		98	does not cause any problem... */
		99
		100	struct timespec cbsghd_dline[MAX_PROC]; /+ CBSGHD deadlines +/
		101
		102	TIME period[MAX_PROC]; /+ CBSGHD activation period +/
		103
		104	TIME maxperiod[MAX_PROC]; /+ maximum period of each elastic task +/
		105
		106	int cremaining[MAX_PROC]; /+ instance remaining computation time +/
		107
		108	TIME act_period[MAX_PROC]; /*+ actual period of each elastic task: it
		109	must be less than maxperiod!!! +*/
		110
		111	TIME last_response_time[MAX_PROC]; /* response time of the last instance */
		112
		113	TIME cnormal[MAX_PROC]; /+ CBSGHD normal computation time +/
		114
		115	struct timespec reactivation_time[MAX_PROC];
		116	/+ the time at witch the reactivation timer is post +/
		117	int reactivation_timer[MAX_PROC];
		118	/+ the recativation timer +/
		119
		120	struct cap_queue queue; / pointer to the spare capacity queue */
		121
		122	int flags; /+ the init flags... +/
		123
		124	bandwidth_t U; /+ the used bandwidth by the server +/
		125
		126	int idle; /* the idle flag... */
		127
		128	struct timespec start_idle; /gives the start time of the last idle period /
		129
		130	LEVEL scheduling_level;
		131
		132	} CBSGHD_level_des;
		133
		134
		135	/* insert a capacity in the queue capacity ordering by deadline */
		136
		137	static int c_insert(struct timespec dead, int cap, struct cap_queue **que,
		138	PID p)
		139	{
		140	struct cap_queue prev, n, *new;
		141
		142	prev = NULL;
		143	n = *que;
		144
		145	while ((n != NULL) &&
		146	!TIMESPEC_A_LT_B(&dead, &n->dead)) {
		147	prev = n;
		148	n = n->next;
		149	}
		150
		151
		152	new = (struct cap_queue *)kern_alloc(sizeof(struct cap_queue));
		153	if (new == NULL) {
		154	kern_printf("\nNew cash_queue element failed\n");
		155	kern_raise(XUNVALID_TASK, p);
		156	return -1;
		157	}
		158	new->next = NULL;
		159	new->cap = cap;
		160	new->dead = dead;
		161
		162	if (prev != NULL)
		163	prev->next = new;
		164	else
		165	*que = new;
		166
		167	if (n != NULL)
		168	new->next = n;
		169	return 0;
		170	}
		171
		172	/* extract the first element from the capacity queue */
		173
		174	static int c_extractfirst(struct cap_queue **que)
		175	{
		176	struct cap_queue p = que;
		177
		178
		179	if (*que == NULL) return(-1);
		180
		181	que = (que)->next;
		182
		183	kern_free(p, sizeof(struct cap_queue));
		184	return(1);
		185	}
		186
		187	/* read data of the first element from the capacity queue */
		188
		189	static void c_readfirst(struct timespec d, int c, struct cap_queue *que)
		190	{
		191	*d = que->dead;
		192	*c = que->cap;
		193	}
		194
		195	/* write data of the first element from the capacity queue */
		196
		197	static void c_writefirst(struct timespec dead, int cap, struct cap_queue *que)
		198	{
		199	que->dead = dead;
		200	que->cap = cap;
		201	}
		202
		203
		204	static void CBSGHD_activation(CBSGHD_level_des *lev,
		205	PID p,
		206	struct timespec *acttime)
		207	{
		208	JOB_TASK_MODEL job;
		209
		210
		211	/* This rule is used when we recharge the budget at initial task activation
		212	and each time a new task instance must be activated */
		213
		214	if (TIMESPEC_A_GT_B(acttime, &lev->cbsghd_dline[p])) {
		215	/* we modify the deadline ... */
		216	TIMESPEC_ASSIGN(&lev->cbsghd_dline[p], acttime);
		217	}
		218
		219	lev->act_period[p] = 0;
		220
		221	if (proc_table[p].avail_time > 0)
		222	proc_table[p].avail_time = 0;
		223
		224
		225
		226
		227	/* there is a while because if the wcet is << than the system tick
		228	we need to postpone the deadline many times */
		229	while (proc_table[p].avail_time <= 0) {
		230
		231	/* A spare capacity is inserted in the capacity queue!! */
		232	ADDUSEC2TIMESPEC(lev->period[p], &lev->cbsghd_dline[p]);
		233	lev->act_period[p] += lev->period[p];
		234	c_insert(lev->cbsghd_dline[p], lev->cnormal[p], &lev->queue, p);
		235
		236
		237	/* it exploits available capacities from the capacity queue */
		238	while (proc_table[p].avail_time < (int)lev->cnormal[p] &&
		239	lev->queue != NULL) {
		240	struct timespec dead;
		241	int cap, delta;
		242	delta = lev->cnormal[p] - proc_table[p].avail_time;
		243	c_readfirst(&dead, &cap, lev->queue);
		244	if (!TIMESPEC_A_GT_B(&dead, &lev->cbsghd_dline[p])) {
		245	if (cap > delta) {
		246	proc_table[p].avail_time += delta;
		247	c_writefirst(dead, cap - delta, lev->queue);
		248	}
		249	else {
		250	proc_table[p].avail_time += cap;
		251	c_extractfirst(&lev->queue);
		252	}
		253	}
		254	else
		255	break;
		256	}
		257	}
		258
		259	lev->cremaining[p] = proc_table[p].wcet - proc_table[p].avail_time;
		260
		261
		262	#ifdef TESTG
		263	if (starttime && p == 3) {
		264	oldx = x;
		265	x = ((lev->cbsghd_dline[p].tv_sec*1000000+lev->cbsghd_dline[p].tv_nsec/1000)/5000 - starttime) + 20;
		266	// kern_printf("(a%d)",lev->cbsghd_dline[p].tv_sec*1000000+lev->cbsghd_dline[p].tv_nsec/1000);
		267	if (oldx > x) sys_end();
		268	if (x<640)
		269	grx_plot(x, 15, 8);
		270	}
		271	#endif
		272
		273	/* and, finally, we reinsert the task in the master level */
		274	job_task_default_model(job, lev->cbsghd_dline[p]);
		275	job_task_def_yesexc(job);
		276	level_table[ lev->scheduling_level ]->
		277	guest_create(lev->scheduling_level, p, (TASK_MODEL *)&job);
		278	level_table[ lev->scheduling_level ]->
		279	guest_activate(lev->scheduling_level, p);
		280	}
		281
		282
		283	static char *CBSGHD_status_to_a(WORD status)
		284	{
		285	if (status < MODULE_STATUS_BASE)
		286	return status_to_a(status);
		287
		288	switch (status) {
		289	case CBSGHD_IDLE : return "CBSGHD_Idle";
		290	case CBSGHD_ZOMBIE : return "CBSGHD_Zombie";
		291	case CBSGHD_DELAY : return "CBSGHD_Delay";
		292	default : return "CBSGHD_Unknown";
		293	}
		294	}
		295
		296
		297
		298
		299	/* this is the periodic reactivation of the task... */
		300	static void CBSGHD_timer_reactivate(void *par)
		301	{
		302	PID p = (PID) par;
		303	CBSGHD_level_des *lev;
		304
		305	lev = (CBSGHD_level_des *)level_table[proc_table[p].task_level];
		306
		307	if (proc_table[p].status == CBSGHD_IDLE) {
		308	/* the task has finished the current activation and must be
		309	reactivated */
		310
		311	/* request_time represents the time of the last instance release!! */
		312	TIMESPEC_ASSIGN(&proc_table[p].request_time, &lev->reactivation_time[p]);
		313
		314	/* If idle=1, then we have to discharge the capacities stored in
		315	the capacity queue up to the length of the idle interval */
		316	if (lev->idle == 1) {
		317	TIME interval;
		318	struct timespec delta;
		319	lev->idle = 0;
		320	SUBTIMESPEC(&proc_table[p].request_time, &lev->start_idle, &delta);
		321	/* length of the idle interval expressed in usec! */
		322	interval = TIMESPEC2NANOSEC(&delta) / 1000;
		323
		324	/* it discharge the available capacities from the capacity queue */
		325	while (interval > 0 && lev->queue != NULL) {
		326	struct timespec dead;
		327	int cap;
		328	c_readfirst(&dead, &cap, lev->queue);
		329	if (cap > interval) {
		330	c_writefirst(dead, cap - interval, lev->queue);
		331	interval = 0;
		332	}
		333	else {
		334	interval -= cap;
		335	c_extractfirst(&lev->queue);
		336	}
		337	}
		338	}
		339
		340	CBSGHD_activation(lev,p,&lev->reactivation_time[p]);
		341
		342	/* check the constraint on the maximum period permitted... */
		343	if (lev->act_period[p] > lev->maxperiod[p]) {
		344	kern_printf("Deadline miss(timer_react.! process:%d act_period:%lu maxperiod:%lu\n",
		345	p, lev->act_period[p], lev->maxperiod[p]);
		346	kern_raise(XDEADLINE_MISS,p);
		347	}
		348
		349
		350	/* Set the reactivation timer */
		351	TIMESPEC_ASSIGN(&lev->reactivation_time[p], &lev->cbsghd_dline[p]);
		352	lev->reactivation_timer[p] = kern_event_post(&lev->reactivation_time[p],
		353	CBSGHD_timer_reactivate,
		354	(void *)p);
		355	event_need_reschedule();
		356	}
		357	else {
		358	/* this situation cannot occur */
		359	kern_printf("Trying to reactivate a task which is not IDLE!!!/n");
		360	kern_raise(XUNVALID_TASK,p);
		361	}
		362	}
		363
		364
		365
		366
		367
		368	static void CBSGHD_avail_time_check(CBSGHD_level_des *lev, PID p)
		369	{
		370
		371	/*+ if the capacity became negative the remaining computation time
		372	is diminuished.... +*/
		373	/* if (p==4)
		374	kern_printf("(old dead:%d av_time:%d crem:%d)\n",
		375	lev->cbsghd_dline[p].tv_sec*1000000+
		376	lev->cbsghd_dline[p].tv_nsec/1000, proc_table[p].avail_time,
		377	lev->cremaining[p]); */
		378
		379
		380	if (proc_table[p].avail_time < 0)
		381	lev->cremaining[p] += proc_table[p].avail_time;
		382
		383	if (lev->cremaining[p] <= 0) {
		384	kern_printf("Task:%d WCET violation \n", p);
		385	kern_raise(XWCET_VIOLATION, p);
		386	ll_abort(666);
		387	}
		388
		389
		390	/* there is a while because if the wcet is << than the system tick
		391	we need to postpone the deadline many times */
		392	while (proc_table[p].avail_time <= 0) {
		393	/* it exploits available capacities from the capacity queue */
		394	while (proc_table[p].avail_time < lev->cremaining[p]
		395	&& lev->queue != NULL) {
		396	struct timespec dead;
		397	int cap, delta;
		398	delta = lev->cremaining[p] - proc_table[p].avail_time;
		399	c_readfirst(&dead, &cap, lev->queue);
		400	if (!TIMESPEC_A_GT_B(&dead, &lev->cbsghd_dline[p])) {
		401	if (cap > delta) {
		402	proc_table[p].avail_time += delta;
		403	c_writefirst(dead, cap - delta, lev->queue);
		404	}
		405	else {
		406	proc_table[p].avail_time += cap;
		407	c_extractfirst(&lev->queue);
		408	}
		409	}
		410	else
		411	break;
		412	}
		413
		414	/* if (p==5 && proc_table[p].avail_time <= 0 &&
		415	lev->cremaining[p] > lev->cnormal[p])
		416	kern_printf("(inter dead:%d av_time:%d crem:%d)\n",
		417	lev->cbsghd_dline[p].tv_sec*1000000+
		418	lev->cbsghd_dline[p].tv_nsec/1000, proc_table[p].avail_time,
		419	lev->cremaining[p]); */
		420
		421
		422	/* The remaining computation time is modified according
		423	to the new budget! */
		424	if (proc_table[p].avail_time > 0)
		425	lev->cremaining[p] -= proc_table[p].avail_time;
		426	else {
		427	/* the CBSGHD rule for recharging the capacity: */
		428	if (lev->cremaining[p] > lev->cnormal[p]) {
		429	ADDUSEC2TIMESPEC(lev->period[p], &lev->cbsghd_dline[p]);
		430	lev->act_period[p] += lev->period[p];
		431	/* A spare capacity is inserted in the capacity queue!! */
		432	c_insert(lev->cbsghd_dline[p], lev->cnormal[p], &lev->queue, p);
		433	}
		434	else {
		435	TIME t;
		436	t = (lev->cremaining[p] * lev->period[p]) / lev->cnormal[p];
		437	ADDUSEC2TIMESPEC(t, &lev->cbsghd_dline[p]);
		438	lev->act_period[p] += t;
		439	/* A spare capacity is inserted in the capacity queue!! */
		440	c_insert(lev->cbsghd_dline[p], lev->cremaining[p], &lev->queue, p);
		441	}
		442	}
		443	}
		444
		445	/* if (p==4)
		446	kern_printf("n dead:%d av_time:%d crem:%d)\n",
		447	lev->cbsghd_dline[p].tv_sec*1000000+
		448	lev->cbsghd_dline[p].tv_nsec/1000, proc_table[p].avail_time,
		449	lev->cremaining[p]); */
		450
		451	/* check the constraint on the maximum period permitted... */
		452	if (lev->act_period[p] > lev->maxperiod[p]) {
		453	/*kern_printf("n dead:%d av_time:%d crem:%d)\n",
		454	lev->cbsghd_dline[p].tv_sec*1000000+
		455	lev->cbsghd_dline[p].tv_nsec/1000, proc_table[p].avail_time,
		456	lev->cremaining[p]); */
		457	kern_printf("Deadline miss(av.time_check! process:%d act_period:%lu maxperiod:%lu\n",
		458	p, lev->act_period[p], lev->maxperiod[p]);
		459	kern_raise(XDEADLINE_MISS,p);
		460	}
		461
		462
		463
		464	if (TIMESPEC_A_LT_B(&lev->reactivation_time[p], &lev->cbsghd_dline[p])) {
		465	/* we delete the reactivation timer */
		466	event_delete(lev->reactivation_timer[p]);
		467	/* repost the event at the next instance deadline... */
		468	lev->reactivation_time[p] = lev->cbsghd_dline[p];
		469	lev->reactivation_timer[p] = kern_event_post(&lev->reactivation_time[p],
		470	CBSGHD_timer_reactivate,
		471	(void *)p);
		472	}
		473
		474	#ifdef TESTG
		475	if (starttime && p == 3) {
		476	oldx = x;
		477	x = ((lev->cbsghd_dline[p].tv_sec*1000000+
		478	lev->cbsghd_dline[p].tv_nsec/1000)/5000 - starttime) + 20;
		479	// kern_printf("(e%d avail%d)",lev->cbsghd_dline[p].tv_sec*1000000+
		480	lev->cbsghd_dline[p].tv_nsec/1000,proc_table[p].avail_time);
		481	if (oldx > x) sys_end();
		482	if (x<640)
		483	grx_plot(x, 15, 2);
		484	}
		485	#endif
		486
		487	}
		488
		489
		490	/*+ this function is called when a killed or ended task reach the
		491	period end +*/
		492	static void CBSGHD_timer_zombie(void *par)
		493	{
		494	PID p = (PID) par;
		495	CBSGHD_level_des *lev;
		496
		497	lev = (CBSGHD_level_des *)level_table[proc_table[p].task_level];
		498
		499	/* we finally put the task in the FREE status */
		500	proc_table[p].status = FREE;
		501	q_insertfirst(p,&freedesc);
		502
		503	/* and free the allocated bandwidth */
		504	lev->U -= (MAX_BANDWIDTH/lev->period[p]) * lev->cnormal[p];
		505
		506	}
		507
		508
		509	static int CBSGHD_level_accept_task_model(LEVEL l, TASK_MODEL *m)
		510	{
		511
		512
		513	if (m->pclass == ELASTIC_HARD_PCLASS \|\| m->pclass ==
		514	(ELASTIC_HARD_PCLASS \| l)) {
		515	ELASTIC_HARD_TASK_MODEL s = (ELASTIC_HARD_TASK_MODEL )m;
		516	bandwidth_t b1, b2;
		517	/* kern_printf("accept :ELASTIC TASK found!!!!!!\n"); */
		518	b1 = (MAX_BANDWIDTH / s->period) * s->cnormal;
		519	b2 = (MAX_BANDWIDTH / s->maxperiod) * s->wcet;
		520	if (s->wcet && s->cnormal && s->period && s->maxperiod &&
		521	s->wcet >= s->cnormal && b1 >= b2)
		522	return 0;
		523	/* kern_printf("period: %d maxperiod: %d cnormal: %d wcet: %d, b1: %d b2:
		524	%d\n", s->period, s->maxperiod, s->cnormal, s->wcet, b1, b2); */
		525	}
		526	return -1;
		527	}
		528
		529	static int CBSGHD_level_accept_guest_model(LEVEL l, TASK_MODEL *m)
		530	{
		531	return -1;
		532	}
		533
		534	static char *onoff(int i)
		535	{
		536	if (i)
		537	return "On ";
		538	else
		539	return "Off";
		540	}
		541
		542	static void CBSGHD_level_status(LEVEL l)
		543	{
		544	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		545	PID p;
		546
		547	kern_printf("On-line guarantee : %s\n",
		548	onoff(lev->flags & CBSGHD_ENABLE_GUARANTEE));
		549	kern_printf("Used Bandwidth : %u/%u\n",
		550	lev->U, MAX_BANDWIDTH);
		551
		552	for (p=0; p<MAX_PROC; p++)
		553	if (proc_table[p].task_level == l && proc_table[p].status != FREE )
		554	kern_printf("Pid: %2d Name: %10s Period: %9ld Dline: %9ld.%6ld Stat: %s\n",
		555	p,
		556	proc_table[p].name,
		557	lev->period[p],
		558	lev->cbsghd_dline[p].tv_sec,
		559	lev->cbsghd_dline[p].tv_nsec/1000,
		560	CBSGHD_status_to_a(proc_table[p].status));
		561	}
		562
		563	static PID CBSGHD_level_scheduler(LEVEL l)
		564	{
		565	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		566
		567	/* it stores the actual time and set the IDLE flag in order to handle
		568	the capacity queue discharging!!! */
		569	lev->idle = 1;
		570	ll_gettime(TIME_EXACT, &lev->start_idle);
		571
		572
		573	/* the CBSGHD don't schedule anything...
		574	it's an EDF level or similar that do it! */
		575	return NIL;
		576	}
		577
		578	/* The on-line guarantee is enabled only if the appropriate flag is set... */
		579	static int CBSGHD_level_guarantee(LEVEL l, bandwidth_t *freebandwidth)
		580	{
		581	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		582
		583	if (lev->flags & CBSGHD_FAILED_GUARANTEE) {
		584	*freebandwidth = 0;
		585	//kern_printf("guarantee :garanzia fallita!!!!!!\n");
		586	return 0;
		587	}
		588	else if (*freebandwidth >= lev->U) {
		589	*freebandwidth -= lev->U;
		590	return 1;
		591	}
		592	else {
		593	//kern_printf("guarantee :garanzia fallita per mancanza di banda!!!!!!\n");
		594	//kern_printf("freeband: %d request band: %d", *freebandwidth, lev->U);
		595	return 0;
		596	}
		597	}
		598
		599	static int CBSGHD_task_create(LEVEL l, PID p, TASK_MODEL *m)
		600	{
		601	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		602
		603	/* if the CBSGHD_task_create is called, then the pclass must be a
		604	valid pclass. */
		605	ELASTIC_HARD_TASK_MODEL s = (ELASTIC_HARD_TASK_MODEL )m;
		606
		607	/* Enable wcet check */
		608	proc_table[p].avail_time = 0;
		609	proc_table[p].wcet = s->wcet;
		610	proc_table[p].control \|= CONTROL_CAP;
		611
		612	lev->period[p] = s->period;
		613	lev->maxperiod[p] = s->maxperiod;
		614	lev->cnormal[p] = s->cnormal;
		615	NULL_TIMESPEC(&lev->cbsghd_dline[p]);
		616
		617
		618	/* update the bandwidth... */
		619	if (lev->flags & CBSGHD_ENABLE_GUARANTEE) {
		620	bandwidth_t b;
		621	b = (MAX_BANDWIDTH / s->period) * s->cnormal;
		622
		623	/* really update lev->U, checking an overflow... */
		624	if (MAX_BANDWIDTH - lev->U > b)
		625	lev->U += b;
		626	else
		627	/* The task can NOT be guaranteed (U>MAX_BANDWIDTH)...
		628	(see EDF.c) */
		629	lev->flags \|= CBSGHD_FAILED_GUARANTEE;
		630	}
		631
		632
		633
		634	return 0; /* OK, also if the task cannot be guaranteed... */
		635	}
		636
		637	static void CBSGHD_task_detach(LEVEL l, PID p)
		638	{
		639	/* the CBSGHD level doesn't introduce any dinamic allocated new field.
		640	we have only to reset the NO_GUARANTEE FIELD and decrement the allocated
		641	bandwidth */
		642
		643	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		644
		645	if (lev->flags & CBSGHD_FAILED_GUARANTEE)
		646	lev->flags &= ~CBSGHD_FAILED_GUARANTEE;
		647	else
		648	lev->U -= (MAX_BANDWIDTH / lev->period[p]) * lev->cnormal[p];
		649
		650
		651	}
		652
		653	static int CBSGHD_task_eligible(LEVEL l, PID p)
		654	{
		655	return 0; /* if the task p is chosen, it is always eligible */
		656	}
		657
		658	#ifdef __TEST1__
		659	extern int testactive;
		660	extern struct timespec s_stime[];
		661	extern TIME s_curr[];
		662	extern TIME s_PID[];
		663	extern int useds;
		664	#endif
		665
		666	static void CBSGHD_task_dispatch(LEVEL l, PID p, int nostop)
		667	{
		668	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		669	level_table[ lev->scheduling_level ]->
		670	guest_dispatch(lev->scheduling_level,p,nostop);
		671
		672	#ifdef __TEST1__
		673	if (testactive)
		674	{
		675	TIMESPEC_ASSIGN(&s_stime[useds], &schedule_time);
		676	s_curr[useds] = proc_table[p].avail_time;
		677	s_PID[useds] = p;
		678	useds++;
		679	}
		680	#endif
		681	}
		682
		683	static void CBSGHD_task_epilogue(LEVEL l, PID p)
		684	{
		685	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		686	JOB_TASK_MODEL job;
		687
		688	/* check if the budget is finished... */
		689	if ( proc_table[p].avail_time <= 0) {
		690	/* we kill the current activation */
		691	level_table[ lev->scheduling_level ]->
		692	guest_end(lev->scheduling_level, p);
		693
		694	/* we modify the deadline */
		695	CBSGHD_avail_time_check(lev, p);
		696
		697	/* and, finally, we reinsert the task in the master level */
		698	job_task_default_model(job, lev->cbsghd_dline[p]);
		699	job_task_def_yesexc(job);
		700	level_table[ lev->scheduling_level ]->
		701	guest_create(lev->scheduling_level, p, (TASK_MODEL *)&job);
		702	level_table[ lev->scheduling_level ]->
		703	guest_activate(lev->scheduling_level, p);
		704	// kern_printf("epil : dl %d per %d p %d \|\n",
		705	// lev->cbsghd_dline[p].tv_nsec/1000,lev->period[p],p);
		706
		707	}
		708	else
		709	/* the task has been preempted. it returns into the ready queue by
		710	calling the guest_epilogue... */
		711	level_table[ lev->scheduling_level ]->
		712	guest_epilogue(lev->scheduling_level,p);
		713	}
		714
		715	static void CBSGHD_task_activate(LEVEL l, PID p)
		716	{
		717	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		718
		719	ll_gettime(TIME_EXACT, &proc_table[p].request_time);
		720
		721	/* If idle=1, then we have to discharge the capacities stored in
		722	the capacity queue up to the length of the idle interval */
		723	if (lev->idle == 1) {
		724	TIME interval;
		725	struct timespec delta;
		726	lev->idle = 0;
		727	SUBTIMESPEC(&proc_table[p].request_time, &lev->start_idle, &delta);
		728	/* length of the idle interval expressed in usec! */
		729	interval = TIMESPEC2NANOSEC(&delta) / 1000;
		730
		731	/* it discharge the available capacities from the capacity queue */
		732	while (interval > 0 && lev->queue != NULL) {
		733	struct timespec dead;
		734	int cap;
		735	c_readfirst(&dead, &cap, lev->queue);
		736	if (cap > interval) {
		737	c_writefirst(dead, cap - interval, lev->queue);
		738	interval = 0;
		739	}
		740	else {
		741	interval -= cap;
		742	c_extractfirst(&lev->queue);
		743	}
		744	}
		745	}
		746
		747	CBSGHD_activation(lev, p, &proc_table[p].request_time);
		748
		749
		750	/* check the constraint on the maximum period permitted... */
		751	if (lev->act_period[p] > lev->maxperiod[p]) {
		752	kern_printf("Deadline miss(task_activ.! process:%d act_period:%lu maxperiod:%lu\n",
		753	p, lev->act_period[p], lev->maxperiod[p]);
		754	kern_raise(XDEADLINE_MISS,p);
		755	}
		756
		757	/* Set the reactivation timer */
		758	TIMESPEC_ASSIGN(&lev->reactivation_time[p], &lev->cbsghd_dline[p]);
		759	lev->reactivation_timer[p] = kern_event_post(&lev->reactivation_time[p],
		760	CBSGHD_timer_reactivate,
		761	(void *)p);
		762
		763	// kern_printf("act : %d %d \|",lev->cbsghd_dline[p].tv_nsec/1000,p);
		764	}
		765
		766	static void CBSGHD_task_insert(LEVEL l, PID p)
		767	{
		768	printk("CBSGHD_task_insert\n");
		769	kern_raise(XUNVALID_TASK,p);
		770	}
		771
		772	static void CBSGHD_task_extract(LEVEL l, PID p)
		773	{
		774	printk("CBSGHD_task_extract\n");
		775	kern_raise(XUNVALID_TASK,p);
		776	}
		777
		778	static void CBSGHD_task_endcycle(LEVEL l, PID p)
		779	{
		780	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		781	struct timespec act_time, res;
		782
		783	/* It computes the response time of the current instance... */
		784	ll_gettime(TIME_EXACT, &act_time);
		785	SUBTIMESPEC(&act_time, &proc_table[p].request_time, &res);
		786	/* response time expressed in usec! */
		787	lev->last_response_time[p] = TIMESPEC2NANOSEC(&res) / 1000;
		788
		789	level_table[ lev->scheduling_level ]->
		790	guest_end(lev->scheduling_level,p);
		791
		792
		793	/* A spare capacity is inserted in the capacity queue!! */
		794	if (proc_table[p].avail_time > 0) {
		795	c_insert(lev->cbsghd_dline[p], proc_table[p].avail_time, &lev->queue, p);
		796	proc_table[p].avail_time = 0;
		797	}
		798
		799
		800	proc_table[p].status = CBSGHD_IDLE;
		801	}
		802
		803	static void CBSGHD_task_end(LEVEL l, PID p)
		804	{
		805	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		806
		807	/* check if the capacity became negative... */
		808	/* there is a while because if the wcet is << than the system tick
		809	we need to postpone the deadline many times */
		810	while (proc_table[p].avail_time < 0) {
		811	/* the CBSGHD rule for recharging the capacity */
		812	proc_table[p].avail_time += lev->cnormal[p];
		813	ADDUSEC2TIMESPEC(lev->period[p], &lev->cbsghd_dline[p]);
		814	}
		815
		816	level_table[ lev->scheduling_level ]->
		817	guest_end(lev->scheduling_level,p);
		818
		819	/* we delete the reactivation timer */
		820	event_delete(lev->reactivation_timer[p]);
		821	lev->reactivation_timer[p] = -1;
		822
		823
		824	/* Finally, we post the zombie event. when the end period is reached,
		825	the task descriptor and banwidth are freed */
		826	proc_table[p].status = CBSGHD_ZOMBIE;
		827	lev->reactivation_timer[p] = kern_event_post(&lev->cbsghd_dline[p],
		828	CBSGHD_timer_zombie,
		829	(void *)p);
		830	}
		831
		832	static void CBSGHD_task_sleep(LEVEL l, PID p)
		833	{
		834	printk("CBSGHD_task_sleep\n");
		835	kern_raise(XUNVALID_TASK,p);
		836	}
		837
		838	static void CBSGHD_task_delay(LEVEL l, PID p, TIME usdelay)
		839	{
		840	printk("CBSGHD_task_delay\n");
		841	kern_raise(XUNVALID_TASK,p);
		842	}
		843
		844
		845	static int CBSGHD_guest_create(LEVEL l, PID p, TASK_MODEL *m)
		846	{ kern_raise(XUNVALID_GUEST,exec_shadow); return 0; }
		847
		848	static void CBSGHD_guest_detach(LEVEL l, PID p)
		849	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		850
		851	static void CBSGHD_guest_dispatch(LEVEL l, PID p, int nostop)
		852	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		853
		854	static void CBSGHD_guest_epilogue(LEVEL l, PID p)
		855	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		856
		857	static void CBSGHD_guest_activate(LEVEL l, PID p)
		858	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		859
		860	static void CBSGHD_guest_insert(LEVEL l, PID p)
		861	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		862
		863	static void CBSGHD_guest_extract(LEVEL l, PID p)
		864	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		865
		866	static void CBSGHD_guest_endcycle(LEVEL l, PID p)
		867	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		868
		869	static void CBSGHD_guest_end(LEVEL l, PID p)
		870	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		871
		872	static void CBSGHD_guest_sleep(LEVEL l, PID p)
		873	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		874
		875	static void CBSGHD_guest_delay(LEVEL l, PID p,DWORD tickdelay)
		876	{ kern_raise(XUNVALID_GUEST,exec_shadow); }
		877
		878
		879
		880
		881	/* Registration functions */
		882
		883	/*+ Registration function:
		884	int flags the init flags ... see CBS.h +*/
		885	void CBSGHD_register_level(int flags, LEVEL master)
		886	{
		887	LEVEL l; /* the level that we register */
		888	CBSGHD_level_des lev; / for readableness only */
		889	PID i; /* a counter */
		890
		891	printk("CBSGHD_register_level\n");
		892
		893	/* request an entry in the level_table */
		894	l = level_alloc_descriptor();
		895
		896	printk(" alloco descrittore %d %d\n",l,sizeof(CBSGHD_level_des));
		897
		898	/* alloc the space needed for the CBSGHD_level_des */
		899	lev = (CBSGHD_level_des *)kern_alloc(sizeof(CBSGHD_level_des));
		900
		901	printk(" lev=%d\n",(int)lev);
		902
		903	/* update the level_table with the new entry */
		904	level_table[l] = (level_des *)lev;
		905
		906	/* fill the standard descriptor */
		907	strncpy(lev->l.level_name, CBSGHD_LEVELNAME, MAX_LEVELNAME);
		908	lev->l.level_code = CBSGHD_LEVEL_CODE;
		909	lev->l.level_version = CBSGHD_LEVEL_VERSION;
		910
		911	lev->l.level_accept_task_model = CBSGHD_level_accept_task_model;
		912	lev->l.level_accept_guest_model = CBSGHD_level_accept_guest_model;
		913	lev->l.level_status = CBSGHD_level_status;
		914	lev->l.level_scheduler = CBSGHD_level_scheduler;
		915
		916	if (flags & CBSGHD_ENABLE_GUARANTEE)
		917	lev->l.level_guarantee = CBSGHD_level_guarantee;
		918	else
		919	lev->l.level_guarantee = NULL;
		920
		921	lev->l.task_create = CBSGHD_task_create;
		922	lev->l.task_detach = CBSGHD_task_detach;
		923	lev->l.task_eligible = CBSGHD_task_eligible;
		924	lev->l.task_dispatch = CBSGHD_task_dispatch;
		925	lev->l.task_epilogue = CBSGHD_task_epilogue;
		926	lev->l.task_activate = CBSGHD_task_activate;
		927	lev->l.task_insert = CBSGHD_task_insert;
		928	lev->l.task_extract = CBSGHD_task_extract;
		929	lev->l.task_endcycle = CBSGHD_task_endcycle;
		930	lev->l.task_end = CBSGHD_task_end;
		931	lev->l.task_sleep = CBSGHD_task_sleep;
		932	lev->l.task_delay = CBSGHD_task_delay;
		933
		934	lev->l.guest_create = CBSGHD_guest_create;
		935	lev->l.guest_detach = CBSGHD_guest_detach;
		936	lev->l.guest_dispatch = CBSGHD_guest_dispatch;
		937	lev->l.guest_epilogue = CBSGHD_guest_epilogue;
		938	lev->l.guest_activate = CBSGHD_guest_activate;
		939	lev->l.guest_insert = CBSGHD_guest_insert;
		940	lev->l.guest_extract = CBSGHD_guest_extract;
		941	lev->l.guest_endcycle = CBSGHD_guest_endcycle;
		942	lev->l.guest_end = CBSGHD_guest_end;
		943	lev->l.guest_sleep = CBSGHD_guest_sleep;
		944	lev->l.guest_delay = CBSGHD_guest_delay;
		945
		946	/* fill the CBSGHD descriptor part */
		947	for (i=0; i<MAX_PROC; i++) {
		948	NULL_TIMESPEC(&lev->cbsghd_dline[i]);
		949	lev->period[i] = 0;
		950	lev->last_response_time[i] = 0;
		951	NULL_TIMESPEC(&lev->reactivation_time[i]);
		952	lev->reactivation_timer[i] = -1;
		953	}
		954
		955
		956	lev->U = 0;
		957	lev->idle = 0;
		958	lev->queue = NULL;
		959
		960	lev->scheduling_level = master;
		961
		962	lev->flags = flags & 0x07;
		963	}
		964
		965
		966	int CBSGHD_get_response_time(LEVEL l, PID p)
		967	{
		968	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		969	return lev->last_response_time[p];
		970	}
		971
		972
		973	bandwidth_t CBSGHD_usedbandwidth(LEVEL l)
		974	{
		975	CBSGHD_level_des lev = (CBSGHD_level_des )(level_table[l]);
		976	if (lev->l.level_code == CBSGHD_LEVEL_CODE &&
		977	lev->l.level_version == CBSGHD_LEVEL_VERSION)
		978	return lev->U;
		979	else
		980	return 0;
		981	}
		982

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