Added a memlayout.txt, revised README, reduced env size to 4kb

tasks/libposix/env.c

@@ -0,0 +1,34 @@
+/*
+ * Environment accessor functions
+ *
+ * Copyright (C) 2008 Bahadir Balban
+ */
+#include <string.h>
+#include <stdlib.h>
+
+char **__environ;
+
+/*
+ * Search for given name in name=value string pairs located
+ * in the environment segment, and return the pointer to value
+ * string.
+ */
+char *getenv(const char *name)
+{
+	char **envp = __environ;
+	int length;
+
+	if (!envp)
+		return 0;
+	length = strlen(name);
+
+	while(*envp) {
+		if (memcmp(name, *envp, length) == 0 &&
+		    (*envp)[length] == '=')
+			return *envp + length + 1;
+		envp++;
+	}
+
+	return 0;
+}
+

tasks/mm0/include/task.h

@@ -20,7 +20,7 @@
 #define TASK_FILES_MAX			32
 
 /* POSIX minimum is 4Kb */
-#define DEFAULT_ENV_SIZE		SZ_16K
+#define DEFAULT_ENV_SIZE		SZ_4K
 #define DEFAULT_STACK_SIZE		SZ_16K
 #define DEFAULT_UTCB_SIZE		PAGE_SIZE