initial commit of lk (little kernel) project
diff --git a/lib/lwip/src/core/memp.c b/lib/lwip/src/core/memp.c
new file mode 100644
index 0000000..c0cfce2
--- /dev/null
+++ b/lib/lwip/src/core/memp.c
@@ -0,0 +1,274 @@
+/*
+ * Copyright (c) 2001-2004 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. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/memp.h"
+
+#include "lwip/pbuf.h"
+#include "lwip/udp.h"
+#include "lwip/raw.h"
+#include "lwip/tcp.h"
+#include "lwip/api.h"
+#include "lwip/api_msg.h"
+#include "lwip/tcpip.h"
+
+#include "lwip/sys.h"
+#include "lwip/stats.h"
+
+struct memp {
+ struct memp *next;
+};
+
+
+
+static struct memp *memp_tab[MEMP_MAX];
+
+static const u16_t memp_sizes[MEMP_MAX] = {
+ sizeof(struct pbuf),
+ sizeof(struct raw_pcb),
+ 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 u16_t memp_num[MEMP_MAX] = {
+ MEMP_NUM_PBUF,
+ MEMP_NUM_RAW_PCB,
+ 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 u8_t memp_memory[(MEMP_NUM_PBUF *
+ MEM_ALIGN_SIZE(sizeof(struct pbuf) +
+ sizeof(struct memp)) +
+ MEMP_NUM_RAW_PCB *
+ MEM_ALIGN_SIZE(sizeof(struct raw_pcb) +
+ 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 !SYS_LIGHTWEIGHT_PROT
+static sys_sem_t mutex;
+#endif
+
+#if MEMP_SANITY_CHECK
+static int
+memp_sanity(void)
+{
+ s16_t 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) return 0; /* LW was: abort(); */
+ }
+ }
+ }
+ return 1;
+}
+#endif /* MEMP_SANITY_CHECK*/
+
+void
+memp_init(void)
+{
+ struct memp *m, *memp;
+ u16_t i, j;
+ u16_t size;
+
+#if MEMP_STATS
+ for(i = 0; i < MEMP_MAX; ++i) {
+ lwip_stats.memp[i].used = lwip_stats.memp[i].max =
+ lwip_stats.memp[i].err = 0;
+ lwip_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((u8_t *)m + size);
+ memp = m;
+ m = m->next;
+ }
+ memp->next = NULL;
+ memp = m;
+ } else {
+ memp_tab[i] = NULL;
+ }
+ }
+
+#if !SYS_LIGHTWEIGHT_PROT
+ mutex = sys_sem_new(1);
+#endif
+
+
+}
+
+void *
+memp_malloc(memp_t type)
+{
+ struct memp *memp;
+ void *mem;
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_DECL_PROTECT(old_level);
+#endif
+
+ LWIP_ASSERT("memp_malloc: type < MEMP_MAX", type < MEMP_MAX);
+
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_PROTECT(old_level);
+#else /* SYS_LIGHTWEIGHT_PROT */
+ sys_sem_wait(mutex);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+
+ memp = memp_tab[type];
+
+ if (memp != NULL) {
+ memp_tab[type] = memp->next;
+ memp->next = NULL;
+#if MEMP_STATS
+ ++lwip_stats.memp[type].used;
+ if (lwip_stats.memp[type].used > lwip_stats.memp[type].max) {
+ lwip_stats.memp[type].max = lwip_stats.memp[type].used;
+ }
+#endif /* MEMP_STATS */
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_UNPROTECT(old_level);
+#else /* SYS_LIGHTWEIGHT_PROT */
+ sys_sem_signal(mutex);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+ LWIP_ASSERT("memp_malloc: memp properly aligned",
+ ((mem_ptr_t)MEM_ALIGN((u8_t *)memp + sizeof(struct memp)) % MEM_ALIGNMENT) == 0);
+
+ mem = MEM_ALIGN((u8_t *)memp + sizeof(struct memp));
+ return mem;
+ } else {
+ LWIP_DEBUGF(MEMP_DEBUG | 2, ("memp_malloc: out of memory in pool %"S16_F"\n", type));
+#if MEMP_STATS
+ ++lwip_stats.memp[type].err;
+#endif /* MEMP_STATS */
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_UNPROTECT(old_level);
+#else /* SYS_LIGHTWEIGHT_PROT */
+ sys_sem_signal(mutex);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+ return NULL;
+ }
+}
+
+void
+memp_free(memp_t type, void *mem)
+{
+ struct memp *memp;
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_DECL_PROTECT(old_level);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+
+ if (mem == NULL) {
+ return;
+ }
+ memp = (struct memp *)((u8_t *)mem - sizeof(struct memp));
+
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_PROTECT(old_level);
+#else /* SYS_LIGHTWEIGHT_PROT */
+ sys_sem_wait(mutex);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+
+#if MEMP_STATS
+ lwip_stats.memp[type].used--;
+#endif /* MEMP_STATS */
+
+ memp->next = memp_tab[type];
+ memp_tab[type] = memp;
+
+#if MEMP_SANITY_CHECK
+ LWIP_ASSERT("memp sanity", memp_sanity());
+#endif
+
+#if SYS_LIGHTWEIGHT_PROT
+ SYS_ARCH_UNPROTECT(old_level);
+#else /* SYS_LIGHTWEIGHT_PROT */
+ sys_sem_signal(mutex);
+#endif /* SYS_LIGHTWEIGHT_PROT */
+}
+