Lazy-initialize heap

libpsx/src/memory.c

@@ -12,6 +12,7 @@ extern int __bss_start[];
 extern int __bss_end[];
 
 static unsigned int first_free_page;
+static int init;
 
 // 1K granularity and "pages", so more allocations which are small can be done
 
@@ -22,7 +23,7 @@ static unsigned int  alloc_size[2048];
 // 0x80000000 - 0x8000FFFF		RAM used by the BIOS
 // 0x80010000 - 0x801FFFFF		Program memory
 
-void malloc_setup()
+static void malloc_setup()
 {
 	int x;
 
@@ -53,6 +54,14 @@ void malloc_setup()
 
 void *malloc(size_t size)
 {
+	if (!init)
+	{
+		// Setup memory allocation functions
+		malloc_setup();
+		dprintf("Finished setting up memory allocation functions.\n");
+		init = 1;
+	}
+
 	dprintf("malloc(%d)\n", size);
 
 	int x, y;

libpsx/src/memory.h

@@ -1,6 +0,0 @@
-#ifndef _PSXSDK_MEMORY_H
-#define _PSXSDK_MEMORY_H
-
-void malloc_setup();
-
-#endif

libpsx/src/setup.c

@@ -1,6 +1,5 @@
 #include <psx.h>
 #include <stdio.h>
-#include "memory.h"
 
 extern int __bss_start[];
 extern int __bss_end[];
@@ -38,11 +37,6 @@ void psxsdk_setup()
 		*((unsigned char*)x) = 0;
 
 	dprintf("BSS space cleared.\n");
-	
-// Setup memory allocation functions
-	malloc_setup();
-	
-	dprintf("Finished setting up memory allocation functions.\n");
 
 // Call static constructors
 	call_ctors();