Updated LAN driver

- changed directory layout
- Multicast support (automatic RX filter adjustment)
- MC68000 target in Makefile
- clarified licensing (GPLv3)
- README files

Driver/baxnet/source/compiler.h

@@ -0,0 +1,65 @@
+/*
+  compiler.h
+
+  (C) 2018 Henryk Richter <henryk.richter@gmx.net>
+
+  Interface macros for ASM subroutines for VBCC, GCC and SAS/C
+
+  syntax:
+   ASM SAVEDS int some_asm_subroutine(   
+                         ASMR(d3) unsigned int   some_data    ASMREG(d3),
+                         ASMR(a0) unsigned char *some_address ASMREG(a0) 
+			             );
+
+  Reason for the double spec of An/Dn: some compilers (SAS) require the register
+  on the left hand side, gcc on the right hand side. I wanted to avoid a big macro
+  for the whole argument and moved the stuff into two macros per argument.
+
+*/
+#ifndef _INC_ASMINTERFACE_H
+#define _INC_ASMINTERFACE_H
+
+#ifdef __SASC
+
+#define ASM __asm
+#define ASMR(x) register __ ## x 
+#define ASMREG(x) 
+#define SAVEDS __saveds
+#define STRUCTOFFSET OFFSET /* exec/initializers.h */
+#define INLINE __inline static
+
+#else /* __SASC */
+
+#ifdef __GNUC__
+
+#define ASM
+#define ASMR(x) register
+#define ASMREG(x) __asm("" #x "")
+//#define SAVEDS __saveds
+#define SAVEDS
+#define STRUCTOFFSET OFFSET /* exec/initializers.h */
+#define INLINE static inline 
+
+#else /* __GNUC__ */
+
+#ifdef __VBCC__
+
+#define ASM
+#define ASMR(x) __reg("" #x "")
+#define ASMREG(x)
+#define SAVEDS __saveds
+#define STRUCTOFFSET(_a_,_b_) offsetof(struct _a_, _b_) /* stddef.h */
+#include <stddef.h>
+/* sorry, I ran into some issues inlining stuff with VBCC, disabling it */
+#define INLINE 
+
+#else /* __VBCC__ */
+
+#error "Compiler not supported yet in compiler.h"
+
+#endif /* __VBCC__ */
+#endif /* __GNUC__ */
+#endif /* __SASC */
+
+
+#endif /* _INC_ASMINTERFACE_H */