Add mmap allocator

src/platform.c

@@ -0,0 +1,37 @@
+#include "base_core.h"
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/mman.h>
+
+void *platform_malloc(size_t sz)
+{
+    return malloc(sz);
+}
+
+void platform_free(void *mem)
+{
+    free(mem);
+}
+
+
+void *memory_allocate(size_t sz)
+{
+    int page_size = getpagesize();
+    size_t aligned_sz = AlignUpPow2(sz, page_size);
+
+    void *mem = mmap(0, aligned_sz, PROT_READ | PROT_WRITE, MAP_ANONYMOUS  | MAP_PRIVATE, -1, 0);
+    if (mem == MAP_FAILED) {
+        mem = NULL;
+    }
+    return mem;
+}
+
+void memory_free(void *mem, size_t sz)
+{
+    int page_size = getpagesize();
+    size_t aligned_sz = AlignUpPow2(sz, page_size);
+
+    int rc = munmap(mem, aligned_sz);
+
+    Assert(rc == 0);
+}