dm: Split the simple malloc() implementation into its own file
The simple malloc() implementation is used when memory is tight. It provides
a simple buffer with an incrementing pointer.
At present the implementation is inside dlmalloc. Move it into its own file
so that it is easier to find.
Rather than using relocation as a signal that the full malloc() is
available, add a special GD_FLG_FULL_MALLOC_INIT flag. This signals that the
simple malloc() should no longer be used.
In some cases, such as SPL, even the code space used by the full malloc() is
wasteful. Add a CONFIG_SYS_MALLOC_SIMPLE option to provide only the simple
malloc. In this case the full malloc is not available at all. It saves about
1KB of code space and about 0.5KB of data on Thumb 2.
Acked-by: Tom Rini <trini@ti.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/include/malloc.h b/include/malloc.h
index c33f3b4..5df6348 100644
--- a/include/malloc.h
+++ b/include/malloc.h
@@ -872,33 +872,46 @@
#else
-#ifdef USE_DL_PREFIX
-#define cALLOc dlcalloc
-#define fREe dlfree
-#define mALLOc dlmalloc
-#define mEMALIGn dlmemalign
-#define rEALLOc dlrealloc
-#define vALLOc dlvalloc
-#define pvALLOc dlpvalloc
-#define mALLINFo dlmallinfo
-#define mALLOPt dlmallopt
-#else /* USE_DL_PREFIX */
-#define cALLOc calloc
-#define fREe free
-#define mALLOc malloc
-#define mEMALIGn memalign
-#define rEALLOc realloc
-#define vALLOc valloc
-#define pvALLOc pvalloc
-#define mALLINFo mallinfo
-#define mALLOPt mallopt
-#endif /* USE_DL_PREFIX */
+#ifdef CONFIG_SYS_MALLOC_SIMPLE
+#define malloc malloc_simple
+#define realloc realloc_simple
+#define memalign memalign_simple
+static inline void free(void *ptr) {}
+void *calloc(size_t nmemb, size_t size);
+void *memalign_simple(size_t alignment, size_t bytes);
+void *realloc_simple(void *ptr, size_t size);
+#else
+
+# ifdef USE_DL_PREFIX
+# define cALLOc dlcalloc
+# define fREe dlfree
+# define mALLOc dlmalloc
+# define mEMALIGn dlmemalign
+# define rEALLOc dlrealloc
+# define vALLOc dlvalloc
+# define pvALLOc dlpvalloc
+# define mALLINFo dlmallinfo
+# define mALLOPt dlmallopt
+# else /* USE_DL_PREFIX */
+# define cALLOc calloc
+# define fREe free
+# define mALLOc malloc
+# define mEMALIGn memalign
+# define rEALLOc realloc
+# define vALLOc valloc
+# define pvALLOc pvalloc
+# define mALLINFo mallinfo
+# define mALLOPt mallopt
+# endif /* USE_DL_PREFIX */
#endif
/* Public routines */
-#if __STD_C
+/* Simple versions which can be used when space is tight */
+void *malloc_simple(size_t size);
+
+# if __STD_C
Void_t* mALLOc(size_t);
void fREe(Void_t*);
@@ -913,7 +926,7 @@
void malloc_stats(void);
int mALLOPt(int, int);
struct mallinfo mALLINFo(void);
-#else
+# else
Void_t* mALLOc();
void fREe();
Void_t* rEALLOc();
@@ -927,6 +940,7 @@
void malloc_stats();
int mALLOPt();
struct mallinfo mALLINFo();
+# endif
#endif
/*