tests

kern.c

@@ -179,6 +179,51 @@ int KERN_C_CALL Net_Call_F2_C(unsigned int function,
   return (int)(ret_ax & 0x00ff);
 }
 
+/*
+ * Fully generic INT 21h register test wrapper.
+ * Used for reproducing the NWCREQUEST/NWCSHELLREQ register calls seen in
+ * DeveloperNet 1997 clndos16.lib.
+ */
+int KERN_C_CALL Net_Call_F2X_C(unsigned int ax,
+                               unsigned int bx,
+                               unsigned int cx,
+                               unsigned int dx,
+                               void *req,
+                               void *repl)
+{
+  union REGS inregs;
+  union REGS outregs;
+  struct SREGS segregs;
+  unsigned int ret_ax;
+
+  memset(&inregs, 0, sizeof(inregs));
+  memset(&outregs, 0, sizeof(outregs));
+  memset(&segregs, 0, sizeof(segregs));
+  net_call_c_clear();
+
+  inregs.x.ax = ax;
+  inregs.x.bx = bx;
+  inregs.x.cx = cx;
+  inregs.x.dx = dx;
+  inregs.x.si = FP_OFF(req);
+  inregs.x.di = FP_OFF(repl);
+  segregs.ds  = FP_SEG(req);
+  segregs.es  = FP_SEG(repl);
+
+  net_call_c_save_in(&inregs, &segregs, req, repl);
+
+  int86x(0x21, &inregs, &outregs, &segregs);
+
+  ret_ax = outregs.x.ax & 0x00ff;
+  if (ret_ax)
+    ret_ax |= 0x8900;
+
+  net_call_c_save_out(&outregs, ret_ax);
+
+  return (int)(ret_ax & 0x00ff);
+}
+
+
 void KERN_C_CALL Net_Call_C_Dump(void)
 {
   fprintf(stdout, "NETCALLC in : AX=%04X BX=%04X CX=%04X DX=%04X DS:SI=%04X:%04X ES:DI=%04X:%04X\n",