Cleanup of the debug stuff, prepared for blue screen debugging.

kernel_debugger() didn't do enough before; panic() did all the work - but
since the former is a public function as well, I moved all the functionality
to it. Also fixed a possible buffer overrun in panic().
Renamed dbg_* to debug_*.
"serial_debug_port" setting did not ignore negative values.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@12889 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/common/dprintf.cpp

@@ -88,14 +88,14 @@ dprintf_write(void *cookie, off_t pos, const void *buffer, size_t *_length)
 				memcpy(localBuffer, str, chunkSize);
 				localBuffer[chunkSize] = '\0';
 
-				dbg_puts(localBuffer);
+				debug_puts(localBuffer);
 
 				str += chunkSize;
 				bytesLeft -= chunkSize;
 			}
 		} else {
 			// null-terminated chunk -- just write it
-			dbg_puts(str);
+			debug_puts(str);
 
 			str += chunkSize + 1;
 			bytesLeft -= chunkSize + 1;