Add libmetal memset_io and memcpy_io

The memcpy/memset may not work on device memory on some architecture,
as some architecture assumes the memcpy/memset will only access
aligned device memory address. We add memset_io and memcpy_io
to allow memset/memcpy unaligned device memory access.

Signed-off-by: Wendy Liang <jliang@xilinx.com>

3 files changed, 107 insertions, 0 deletions

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 516afdc..48248f8 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -30,6 +30,7 @@ collect (PROJECT_LIB_SOURCES log.c)
 collect (PROJECT_LIB_SOURCES shmem.c)
 collect (PROJECT_LIB_SOURCES version.c)
 collect (PROJECT_LIB_SOURCES dma.c)
+collect (PROJECT_LIB_SOURCES io.c)
 
 add_subdirectory (compiler)
 add_subdirectory (processor)
diff --git a/lib/io.c b/lib/io.c
new file mode 100644
index 0000000..817b302
--- /dev/null
+++ b/lib/io.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright (c) 2015, Xilinx Inc. and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of Xilinx nor the names of its contributors may be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "metal/io.h"
+
+void *metal_generic_memset_io(void *dst, int c, size_t size)
+{
+        void *retdst = dst;
+        unsigned int cint = (unsigned char)c;
+        unsigned int i;
+        for (i = 1; i < sizeof(int); i++)
+                cint |= (c << (8 * i));
+
+        for (; size && ((uintptr_t)dst % sizeof(int)); dst++, size--)
+                *(unsigned char volatile *)dst = (unsigned char) c;
+        for(; size >= sizeof(int); dst += sizeof(int), size -= sizeof(int))
+                *(unsigned int volatile *)dst = cint;
+        for(; size != 0; dst++, size--)
+                *(unsigned char volatile*)dst = (unsigned char) c;
+        return retdst;
+}
+
+void *metal_generic_memcpy_io(void *dst, const void *src, size_t size)
+{
+        void *retdst = dst;
+        while (size && (
+                ((uintptr_t)dst % sizeof(int)) ||
+                ((uintptr_t)src % sizeof(int)))) {
+                *(unsigned char volatile *)dst =
+                        *(const unsigned char volatile *)src;
+                dst++;
+                src++;
+                size--;
+        }
+        for (; size >= sizeof(int);
+                dst += sizeof(int), src += sizeof(int), size -= sizeof(int))
+                *(unsigned int volatile *)dst =
+                        *(const unsigned int volatile *)src;
+        for (; size != 0; dst++, src++, size--)
+                *(unsigned char volatile *)dst =
+                        *(const unsigned char volatile *)src;
+        return retdst;
+}
+
+void *metal_memset_io(void *dst, int c, size_t size)
+{
+        return metal_generic_memset_io(dst, c, size);
+}
+
+void *metal_memcpy_io(void *dst, const void *src, size_t size)
+{
+        return metal_generic_memcpy_io(dst, src, size);
+}
diff --git a/lib/io.h b/lib/io.h
index badf84e..a0f8fcf 100644
--- a/lib/io.h
+++ b/lib/io.h
@@ -347,6 +347,32 @@ metal_io_write(struct metal_io_region *io, unsigned long offset,
 void *metal_io_mem_map(metal_phys_addr_t pa,
                      struct metal_io_region *io,
                      size_t size);
+
+/**
+ * @brief       libmetal set device memory
+ *
+ * This function is to fill the device memory with the specified value.
+ *
+ * @param[in]   dst  target memory
+ * @param[in]   c    val to fill
+ * @param[in]   size size of memory to fill.
+ * @return      pointer to the target memory
+ */
+void *metal_memset_io(void *dst, int c, size_t size);
+
+/**
+ * @brief       libmetal copy to target memory
+ *
+ * This function is to copy specified memory area.
+ * The source memory or the destination memory can be device memory.
+ *
+ * @param[in]   dst    target memory
+ * @param[in]   src    source memory
+ * @param[in]   size   size of memory to copy.
+ * @return      pointer to the target memory
+ */
+void *metal_memcpy_io(void *dst, const void *src, size_t size);
+
 #ifdef __cplusplus
 }
 #endif