Adding a DOS port to run on x86 single board computer.

bacnet-stack/ports/dos/pchwio.c

@@ -0,0 +1,70 @@
+/*
+**  PCHWIO.C - SNIPPETS portable hardware I/O access under DOS
+**
+**  public domain by Bob Stout
+*/
+
+#include "pchwio.h"
+#include "mk_fp.h"
+
+#if defined(__ZTC__) && !defined(__SC__)
+
+void FAR * getvect(unsigned intnum)
+{
+      unsigned seg, off;
+
+      int_getvector(intnum, &off, &seg);
+      return MK_FP(seg, off);
+}
+
+void setvect(unsigned intnum, void (INTERRUPT FAR *handler)())
+{
+      unsigned seg = FP_SEG(handler), off = FP_OFF(handler);
+
+      int_setvector(intnum, off, seg);
+}
+
+#endif /* ZTC getvect(), setvect() */
+
+
+
+#if defined(_MSC_VER) || defined(__WATCOMC__) || \
+      defined(__ZTC__) || defined(__SC__)
+
+#if !defined(MK_FP)
+ #define MK_FP(seg,off) ((void far *)(((long)(seg) << 16)|(unsigned)(off)))
+#endif
+
+unsigned char Peekb(unsigned seg, unsigned ofs)
+{
+        unsigned char FAR *ptr;
+
+        ptr = MK_FP(seg, ofs);
+        return *ptr;
+}
+
+unsigned short Peekw(unsigned seg, unsigned ofs)
+{
+        unsigned FAR *ptr;
+
+        ptr = MK_FP(seg, ofs);
+        return *ptr;
+}
+
+void Pokeb(unsigned seg, unsigned ofs, unsigned char ch)
+{
+        unsigned char FAR *ptr;
+
+        ptr = MK_FP(seg, ofs);
+        *ptr = ch;
+}
+
+void Pokew(unsigned seg, unsigned ofs, unsigned short num)
+{
+        unsigned FAR *ptr;
+
+        ptr = MK_FP(seg, ofs);
+        *ptr = num;
+}
+
+#endif /* MSC/ZTC/WC Peek(), poke() */