/*
 * Copyright (c) 2001, Swedish Institute of Computer Science.
 * All rights reserved. 
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions 
 * are met: 
 * 1. Redistributions of source code must retain the above copyright 
 *    notice, this list of conditions and the following disclaimer. 
 * 2. Redistributions in binary form must reproduce the above copyright 
 *    notice, this list of conditions and the following disclaimer in the 
 *    documentation and/or other materials provided with the distribution. 
 * 3. Neither the name of the Institute nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software 
 *    without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
 * SUCH DAMAGE. 
 *
 * This file is part of the lwIP TCP/IP stack.
 * 
 * Author: Adam Dunkels <adam@sics.se>
 *
 * $Id: memp.c,v 1.1 2004/04/15 12:38:25 reddawg Exp $
 */

#include <sys/types.h>

#include "net/lwipopts.h"

#include "net/memp.h"

#include "net/pbuf.h"
#include "net/udp.h"
#include "net/tcp.h"
#include "net/api.h"
#include "net/api_msg.h"
#include "net/tcpip.h"

#include "net/sys.h"
#include "net/stats.h"

struct memp {
  struct memp *next;
};



static struct memp *memp_tab[MEMP_MAX];

static const uInt16 memp_sizes[MEMP_MAX] = {
  sizeof(struct pbuf),
  sizeof(struct udp_pcb),
  sizeof(struct tcp_pcb),
  sizeof(struct tcp_pcb_listen),
  sizeof(struct tcp_seg),
  sizeof(struct netbuf),
  sizeof(struct netconn),
  sizeof(struct api_msg),
  sizeof(struct tcpip_msg),
  sizeof(struct sys_timeout)
};

static const uInt16 memp_num[MEMP_MAX] = {
  MEMP_NUM_PBUF,
  MEMP_NUM_UDP_PCB,
  MEMP_NUM_TCP_PCB,
  MEMP_NUM_TCP_PCB_LISTEN,
  MEMP_NUM_TCP_SEG,
  MEMP_NUM_NETBUF,
  MEMP_NUM_NETCONN,
  MEMP_NUM_API_MSG,
  MEMP_NUM_TCPIP_MSG,
  MEMP_NUM_SYS_TIMEOUT
};

static uInt8 memp_memory[(MEMP_NUM_PBUF *
			 MEM_ALIGN_SIZE(sizeof(struct pbuf) +
					sizeof(struct memp)) +
			MEMP_NUM_UDP_PCB *
			 MEM_ALIGN_SIZE(sizeof(struct udp_pcb) +
					sizeof(struct memp)) +
			MEMP_NUM_TCP_PCB *
			 MEM_ALIGN_SIZE(sizeof(struct tcp_pcb) +
					sizeof(struct memp)) +
			MEMP_NUM_TCP_PCB_LISTEN *
			 MEM_ALIGN_SIZE(sizeof(struct tcp_pcb_listen) +
					sizeof(struct memp)) +
			MEMP_NUM_TCP_SEG *
			 MEM_ALIGN_SIZE(sizeof(struct tcp_seg) +
					sizeof(struct memp)) +
			MEMP_NUM_NETBUF *
			 MEM_ALIGN_SIZE(sizeof(struct netbuf) +
					sizeof(struct memp)) +
			MEMP_NUM_NETCONN *
			 MEM_ALIGN_SIZE(sizeof(struct netconn) +
					sizeof(struct memp)) +
			MEMP_NUM_API_MSG *
			 MEM_ALIGN_SIZE(sizeof(struct api_msg) +
					sizeof(struct memp)) +
			MEMP_NUM_TCPIP_MSG *
			 MEM_ALIGN_SIZE(sizeof(struct tcpip_msg) +
					sizeof(struct memp)) +
			MEMP_NUM_SYS_TIMEOUT *
			 MEM_ALIGN_SIZE(sizeof(struct sys_timeout) +
					sizeof(struct memp)))];

#if MEMP_RECLAIM
struct memp_reclaim_ {
  struct memp_reclaim_ *next;
  memp_reclaim_func f;
  void *arg;  
};

static struct memp_reclaim_ *memp_reclaim_funcs[MEMP_MAX];

static uInt8 memp_reclaim(memp_t type);
#endif /* MEMP_RECLAIM */

/*-----------------------------------------------------------------------------------*/
static sys_sem_t mutex;
/*-----------------------------------------------------------------------------------*/
#ifdef LWIP_DEBUG
static int
memp_sanity(void)
{
  int i, c;
  struct memp *m, *n;
  
  for(i = 0; i < MEMP_MAX; i++) {
    for(m = memp_tab[i]; m != NULL; m = m->next) {
      c = 1;
      for(n = memp_tab[i]; n != NULL; n = n->next) {
	if(n == m) {
	  --c;
	}
	if(c < 0)
	  abort();
      }
    }
  }
  return 1;
}
#endif /* LWIP_DEBUG */
/*-----------------------------------------------------------------------------------*/
void
memp_init(void)
{
  struct memp *m, *memp;
  uInt16 i, j;
  uInt16 size;
      
#ifdef MEMP_STATS
  for(i = 0; i < MEMP_MAX; ++i) {
    stats.memp[i].used = stats.memp[i].max =
      stats.memp[i].err = stats.memp[i].reclaimed = 0;
    stats.memp[i].avail = memp_num[i];
  }
#endif /* MEMP_STATS */

  memp = (struct memp *)&memp_memory[0];
  for(i = 0; i < MEMP_MAX; ++i) {
    size = MEM_ALIGN_SIZE(memp_sizes[i] + sizeof(struct memp));
    if(memp_num[i] > 0) {
      memp_tab[i] = memp;
      m = memp;
      
      for(j = 0; j < memp_num[i]; ++j) {
	m->next = (struct memp *)MEM_ALIGN((uInt8 *)m + size);
	memp = m;
	m = m->next;
      }
      memp->next = NULL;
      memp = m;
    } else {
      memp_tab[i] = NULL;
    }
  }

  mutex = sys_sem_new(1);

#if MEMP_RECLAIM
  for(i = 0; i < MEMP_MAX; ++i) {
    memp_reclaim_funcs[i] = NULL;
  }
#endif /* MEMP_RECLAIM */
  
}
/*-----------------------------------------------------------------------------------*/
void *
memp_malloc(memp_t type)
{
  struct memp *memp;

  ASSERT("memp_malloc: type < MEMP_MAX", type < MEMP_MAX);

  memp = memp_tab[type];
  
  if(memp != NULL) {    
    memp_tab[type] = memp->next;    
    memp->next = NULL;
#ifdef MEMP_STATS
    ++stats.memp[type].used;
    if(stats.memp[type].used > stats.memp[type].max) {
      stats.memp[type].max = stats.memp[type].used;
    }
#endif /* MEMP_STATS */
    ASSERT("memp_malloc: memp properly aligned",
	   ((u32_t)MEM_ALIGN((uInt8 *)memp + sizeof(struct memp)) % MEM_ALIGNMENT) == 0);

    return MEM_ALIGN((uInt8 *)memp + sizeof(struct memp));
  } else {
    DEBUGF(MEMP_DEBUG, ("memp_malloc: out of memory in pool %d\n", type));
#ifdef MEMP_STATS
    ++stats.memp[type].err;
#endif /* MEMP_STATS */
    return NULL;
  }
}
/*-----------------------------------------------------------------------------------*/
void *
memp_mallocp(memp_t type)
{
  void *mem;
  sys_sem_wait(mutex);
  mem = memp_malloc(type);
  sys_sem_signal(mutex);
  return mem;
}
/*-----------------------------------------------------------------------------------*/
void *
memp_malloc2(memp_t type)
{
  void *mem;

  mem = memp_malloc(type);
#if MEMP_RECLAIM
  if(mem == NULL) {
    memp_reclaim(type);
    mem = memp_malloc(type);
  }
#endif /* MEMP_RECLAIM */
  return mem;
}
/*-----------------------------------------------------------------------------------*/
void *
memp_realloc(memp_t fromtype, memp_t totype, void *mem)
{
  void *rmem;
  uInt16 size;
  
  if(mem == NULL) {
    return NULL;
  }
  
  rmem = memp_malloc(totype);
  if(rmem != NULL) { 
    size = memp_sizes[totype];
    if(memp_sizes[fromtype] < size) {
      size = memp_sizes[fromtype];
    }
    bcopy(mem, rmem, size);
    memp_free(fromtype, mem);
  }
  return rmem;
}
/*-----------------------------------------------------------------------------------*/
void
memp_free(memp_t type, void *mem)
{
  struct memp *memp;

  if(mem == NULL) {
    return;
  }
  memp = (struct memp *)((uInt8 *)mem - sizeof(struct memp));

#ifdef MEMP_STATS
  stats.memp[type].used--; 
#endif /* MEMP_STATS */
  
  memp->next = memp_tab[type]; 
  memp_tab[type] = memp;

  ASSERT("memp sanity", memp_sanity());
  return;
}
/*-----------------------------------------------------------------------------------*/
void 
memp_freep(memp_t type, void *mem)
{
  sys_sem_wait(mutex);
  memp_free(type, mem);
  sys_sem_signal(mutex);
}
/*-----------------------------------------------------------------------------------*/
#if MEMP_RECLAIM
static uInt8
memp_reclaim(memp_t type)
{
  struct memp_reclaim_ *mr;
    
  for(mr = memp_reclaim_funcs[type]; mr != NULL; mr = mr->next) {
    DEBUGF(MEMP_DEBUG, ("memp_reclaim: calling reclaimer for type %d\n", type));
    if(mr->f(mr->arg, type) != 0) {
#ifdef MEMP_STATS
      ++stats.memp[type].reclaimed;
#endif /* MEMP_STATS */
      return 1;
    }
  }
  return 0;
}
/*-----------------------------------------------------------------------------------*/
void
memp_register_reclaim(memp_t type, memp_reclaim_func f, void *arg)
{
  struct memp_reclaim_ *mr;

  mr = mem_malloc(sizeof(struct memp_reclaim_));
  if(mr == NULL) {
    return;
  }
  mr->next = memp_reclaim_funcs[type];
  memp_reclaim_funcs[type] = mr;  
  mr->f = f;
  mr->arg = arg;
  DEBUGF(MEMP_DEBUG, ("memp_register_reclaim: registering reclaimer for type %d\n", type));
}
#endif /* MEMP_RECLAIM */
/*-----------------------------------------------------------------------------------*/
