Dodo Nethub support (#445)

* added support for XNS networking via Dodo-Nethub

* NetHub connection now optional (only if -nh-host is given); released NetHub-related changes to 'ether.c' to the public domain

* Added file using-dodo-networking-with-maiko.md

Documentation for building and using the Dodo-networking addition to Maiko

* Added support for running Maiko unter cygwin/x86_64-x

* Migrate Addr68k/NativeAlignment{2,4} in Nethub code, move timer/async defines to platform.h

* added missing include <netinet/in.h> for FreeBSD

* updated 'compile-flags' with added flags

* splitted ether.c in 3 (_common, _sunos, _nethub)

* reworks/modifications for nbriggs' pull-request review comments

* addintional additions for nbriggs' pull-request review comments

* get the Lisp packet lengths with 'LispInt2CInt'

* renamed variables in dblwordsSwap to indicate it's about double-words

* fixed wrong preprocessor directive unnoticed by clang

* added networking choice option to cmake build, fix to printf warning

- for cmake specify the networking to use with -DMAIKO_NETWORK_TYPE=<type>
- with <type> one of: NONE, SUN_DLPI, SUN_NIT, NETHUB
- e.g.: cmake .. -DMAIKO_NETWORK_TYPE=NETHUB

* integrated improvement to sendPacket() proposed by nbriggs

* integrated fix for SIGBUS on 32-bit big-endian, provided by nbriggs

* MAIKO_ENABLE_ETHERNET should not be unconditionally set on Solaris systems

* Receiving an ethernet packet is an ether interrupt but not an i/o interrupt.

Co-authored-by: dev hawala <devhawala@x.y>
Co-authored-by: Nick Briggs <nicholas.h.briggs@gmail.com>

inc/etherdefs.h

@@ -14,4 +14,10 @@ LispPTR check_ether(void);
 void init_ifpage_ether(void);
 void init_ether(void);
 LispPTR check_sum(LispPTR *args);
+
+void setNethubHost(char* host);
+void setNethubPort(int port);
+void setNethubMac(int m0, int m1, int m2, int m3, int m4, int m5);
+void setNethubLogLevel(int ll);
+void connectToHub();
 #endif

inc/maiko/platform.h

@@ -17,6 +17,8 @@
 #  define MAIKO_OS_CYGWIN 1
 #  define MAIKO_OS_NAME "Cygwin"
 #  define MAIKO_OS_UNIX_LIKE 1
+#  define MAIKO_EMULATE_TIMER_INTERRUPTS 1
+#  define MAIKO_EMULATE_ASYNC_INTERRUPTS 1
 #  define MAIKO_OS_DETECTED 1
 #endif
 

inc/version.h

@@ -218,17 +218,6 @@ typedef intptr_t INT;
 
 
 
-	/********************************************************/
-	/*							*/
-	/********************************************************/
-#ifdef OS5
-		/* Solaris, sort of SYSV-ish, but not really */
-#define MAIKO_ENABLE_ETHERNET
-#endif /* OS5 */
-
-
-
-
 	/********************************************************/
 	/*							*/
 	/********************************************************/