Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / arch / powerpc / lib / memcpy_mpc5200.c

diff --git a/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c b/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c
new file mode 100644 (file)
index 0000000..75a3ef9
--- /dev/null
+++ b/qemu/roms/u-boot/arch/powerpc/lib/memcpy_mpc5200.c
@@ -0,0 +1,55 @@
+/*
+ * (C) Copyright 2010
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+/*
+ * This is a workaround for issues on the MPC5200, where unaligned
+ * 32-bit-accesses to the local bus will deliver corrupted data. This
+ * happens for example when trying to use memcpy() from an odd NOR
+ * flash address; the behaviour can be also seen when using "md" on an
+ * odd NOR flash address (but there it is not a bug in U-Boot, which
+ * only shows the behaviour of this processor).
+ *
+ * For memcpy(), we test if either the source or the target address
+ * are not 32 bit aligned, and - if so - if the source address is in
+ * NOR flash: in this case we perform a byte-wise (slow) then; for
+ * aligned operations of non-flash areas we use the optimized (fast)
+ * real __memcpy().  This way we minimize the performance impact of
+ * this workaround.
+ *
+ */
+
+#include <common.h>
+#include <flash.h>
+#include <linux/types.h>
+
+void *memcpy(void *trg, const void *src, size_t len)
+{
+       extern void* __memcpy(void *, const void *, size_t);
+       char *s = (char *)src;
+       char *t = (char *)trg;
+       void *dest = (void *)src;
+
+       /*
+        * Check is source address is in flash:
+        * If not, we use the fast assembler code
+        */
+       if (((((unsigned long)s & 3) == 0)      /* source aligned  */
+               &&                              /*      AND        */
+            (((unsigned long)t & 3) == 0))     /* target aligned, */
+               ||                              /*      or         */
+           (addr2info((ulong)s) == NULL)) {    /* source not in flash */
+               return __memcpy(trg, src, len);
+       }
+
+       /*
+        * Copying from flash, perform byte by byte copy.
+        */
+       while (len-- > 0)
+               *t++ = *s++;
+
+       return dest;
+}