Stub of an axis interface library

Attempts to mmap the axis AXI4Lite memory region.

lib/Makefile

@@ -0,0 +1,34 @@
+CC = gcc
+CFLAGS := -c -fpic -Wall -Werror
+INCLUDES := -I.
+LIBOPTS := -shared
+
+
+.PHONY : all
+all : interface
+
+
+interface.o :
+	$(CC) $(CFLAGS) $(INCLUDES) interface.c
+
+
+interface : interface.o
+	$(CC) *.o $(LIBOPTS) -o libinterface.so
+
+
+install :
+	sudo cp ${PWD}/libinterface.so /usr/lib
+	sudo cp ${PWD}/interface.h /usr/include
+	sudo chmod 0755 /usr/lib/libinterface.so
+	sudo ldconfig
+
+
+uninstall :
+	sudo rm /usr/lib/libinterface.so
+	sudo rm /usr/include/interface.h
+	sudo ldconfig
+
+
+.PHONY : clean
+clean :
+	rm -f *.o libinterface.so

lib/interface.c

@@ -0,0 +1,24 @@
+#include "interface.h"
+
+#include <assert.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+static void *cfg;
+
+int axis_init(const char *path)
+{
+	int fd;
+	assert((fd = open(path, O_RDWR)) >= 0);
+
+	cfg =
+	    mmap(NULL, REGISTER_NB, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+
+	close(fd);
+	if (cfg == MAP_FAILED) {
+		return -1;	// failure
+	}
+
+	return 0;
+}

lib/interface.h

@@ -0,0 +1,15 @@
+#ifndef INTERFACE_H
+#define INTERFACE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define REGISTER_NB 32
+
+	int axis_init(const char *path);
+
+#ifdef __cplusplus
+}
+#endif
+#endif				/* INTERFACE_H */