patch #6822 (Add option to place memory pools in separate arrays) - new config option MEMP_SEPARATE_POOLS

CHANGELOG

@@ -19,6 +19,10 @@ HISTORY
 
   ++ New features:
 
+  2010-01-10: Simon Goldschmidt (Bill Auerbach)
+  * opt.h, memp.c: patch #6822 (Add option to place memory pools in
+    separate arrays)
+
   2010-01-10: Simon Goldschmidt
   * init.c, igmp.c: patch #6463 (IGMP - Adding Random Delay): added define
     LWIP_RAND() for lwip-wide randomization (to be defined in cc.h)

src/core/memp.c

@@ -143,12 +143,33 @@ static const char *memp_desc[MEMP_MAX] = {
 };
 #endif /* LWIP_DEBUG */
 
-/** This is the actual memory used by the pools. */
+#if MEMP_SEPARATE_POOLS
+
+/** This creates each memory pool. These are named memp_memory_XXX (where XXX
+ * is the name of the pool defined in memp_std.h).
+ * To relocate a pool, declare it as extern in cc.h. Example for GCC:
+ *   extern u8_t __attribute__((section(".onchip_mem"))) memp_memory_UDP_PCB[];
+ */
+#define LWIP_MEMPOOL(name,num,size,desc) u8_t memp_memory_ ## name \
+  ## [((num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size)))];   
+#include "lwip/memp_std.h"
+
+/** This array holds the base of each memory pool. */
+static u8_t *const memp_bases[] = { 
+#define LWIP_MEMPOOL(name,num,size,desc) memp_memory_ ## name,   
+#include "lwip/memp_std.h"
+};
+
+#else /* MEMP_SEPARATE_POOLS */
+
+/** This is the actual memory used by the pools (all pools in one big block). */
 static u8_t memp_memory[MEM_ALIGNMENT - 1 
 #define LWIP_MEMPOOL(name,num,size,desc) + ( (num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size) ) )
 #include "lwip/memp_std.h"
 ];
 
+#endif /* MEMP_SEPARATE_POOLS */
+
 #if MEMP_SANITY_CHECK
 /**
  * Check that memp-lists don't form a circle
@@ -270,10 +291,15 @@ memp_init(void)
     MEMP_STATS_AVAIL(avail, i, memp_num[i]);
   }
 
+#if !MEMP_SEPARATE_POOLS
   memp = LWIP_MEM_ALIGN(memp_memory);
+#endif /* !MEMP_SEPARATE_POOLS */
   /* for every pool: */
   for (i = 0; i < MEMP_MAX; ++i) {
     memp_tab[i] = NULL;
+#if MEMP_SEPARATE_POOLS
+    memp = (struct memp*)memp_bases[i];
+#endif /* MEMP_SEPARATE_POOLS */
     /* create a linked list of memp elements */
     for (j = 0; j < memp_num[i]; ++j) {
       memp->next = memp_tab[i];

src/include/lwip/opt.h

@@ -124,6 +124,15 @@
 #define MEM_SIZE                        1600
 #endif
 
+/**
+ * MEMP_SEPARATE_POOLS: if defined to 1, each pool is placed in its own array.
+ * This can be used to individually change the location of each pool.
+ * Default is one big array for all pools
+ */
+#ifndef MEMP_SEPARATE_POOLS
+#define MEMP_SEPARATE_POOLS             0
+#endif
+
 /**
  * MEMP_OVERFLOW_CHECK: memp overflow protection reserves a configurable
  * amount of bytes before and after each memp element in every pool and fills