diff --git a/include/villas/fpga/dma.h b/include/villas/fpga/dma.h
index bf94399e9..f97965c93 100644
--- a/include/villas/fpga/dma.h
+++ b/include/villas/fpga/dma.h
@@ -18,20 +18,32 @@
 
 #include <xilinx/xaxidma.h>
 
+#define FPGA_DMA_BASEADDR	0x00000000
+#define FPGA_DMA_BOUNDARY	0x1000
+#define FPGA_DMA_BD_OFFSET	0xC0000000
+#define FPGA_DMA_BD_SIZE	(32 << 20) // 32 MB
+
 #define XAXIDMA_SR_SGINCL_MASK	0x00000008
 
-struct dma {
-	XAxiDma inst;
-};
-
 struct dma_mem {
-	uint32_t base_virt;
-	uint32_t base_phys;
+	char *base_virt;
+	char *base_phys;
 	size_t len;
 };
 
+struct dma {
+	XAxiDma inst;
+
+	struct dma_mem bd;
+};
+
 struct ip;
 
+int dma_mem_split(struct dma_mem *o, struct dma_mem *a, struct dma_mem *b);
+
+int dma_alloc(struct ip *c, struct dma_mem *mem, size_t len, int flags);
+int dma_free(struct ip *c, struct dma_mem *mem);
+
 int dma_write(struct ip *c, char *buf, size_t len);
 int dma_read(struct ip *c, char *buf, size_t len);
 int dma_read_complete(struct ip *c, char **buf, size_t *len);
diff --git a/lib/fpga/dma.c b/lib/fpga/dma.c
index f34baf9dd..9e63ae93c 100644
--- a/lib/fpga/dma.c
+++ b/lib/fpga/dma.c
@@ -11,6 +11,7 @@
 #include <sys/types.h>
 #include <unistd.h>
 #include <pthread.h>
+#include <sys/mman.h>
 
 #include <villas/log.h>
 
@@ -18,6 +19,60 @@
 #include "fpga/dma.h"
 #include "fpga/ip.h"
 
+int dma_mem_split(struct dma_mem *o, struct dma_mem *a, struct dma_mem *b)
+{
+	int split = o->len / 2;
+
+	a->base_virt = o->base_virt;
+	a->base_phys = o->base_phys;
+
+	b->base_virt = a->base_virt + split;
+	b->base_phys = a->base_phys + split;
+
+	a->len = split;
+	b->len = o->len - split;
+
+	return 0;
+}
+
+int dma_alloc(struct ip *c, struct dma_mem *mem, size_t len, int flags)
+{
+	int ret;
+
+	/* Align to next bigger page size chunk */
+	if (len & 0xFFF) {
+		len += 0x1000;
+		len &= ~0xFFF;
+	}
+
+	mem->len = len;
+	mem->base_phys = -1; /* find free */
+	mem->base_virt = mmap(0, mem->len, PROT_READ | PROT_WRITE, flags | MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, 0, 0);
+	if (mem->base_virt == MAP_FAILED)
+		return -1;
+
+	ret = vfio_map_dma(c->card->vd.group->container, mem);
+	if (ret)
+		return -2;
+
+	return 0;
+}
+
+int dma_free(struct ip *c, struct dma_mem *mem)
+{
+	int ret;
+	
+	ret = vfio_unmap_dma(c->card->vd.group->container, mem);
+	if (ret)
+		return ret;
+	
+	ret = munmap(mem->base_virt, mem->len);
+	if (ret)
+		return ret;
+	
+	return 0;
+}
+
 int dma_ping_pong(struct ip *c, char *src, char *dst, size_t len)
 {
 	int ret;