The use of I/O ports in the Linux driver to directly control OPL chips
is x86 specific and only really makes sense for x86-based PC's with
compatible hardware.
For some architectures (e.g. ARM), ioperm, inb and outb do exist and are
detected by the configure script (via AC_CHECK_FUNCS(ioperm)), but their
use is inappropriate in these cases and should be avoided.
In some other scenarios, like when using a GNU toolchain + uClibc for
PowerPC, the build even fails with the following error:
opl_linux.c:26:20: fatal error: sys/io.h: No such file or directory
That is so because ioperm() is exported by uClibc and gets detected by
configure, which enables the "Linux" driver via definition of
HAVE_IOPERM, but in practice 'sys/io.h' is missing for ppc (inb/outb is
not implemented, and the call to ioperm() would return EIO anyway).
So, besides testing for HAVE_IOPERM, also test if either __i386__ or
__x86_64__ are defined before enabling this OPL driver.
When the tempo is changed, the times on all active timers must be
adjusted to match the new timing values. Add an API to do this and
invoke it when a tempo change meta event is read.
This change rewrites and simplifies the copyright headers at the top
of all source files:
* Remove "Emacs style mode select" line; this line was included in
the headers for the originally released source files and appears
to be to set the file type for old versions of Emacs. I'm not sure
entirely why it was required but I don't think it is any more.
* Remove "You should have received a copy of..." text from copyright
header. This refers to the old 59 Temple Place address where the
FSF headquarters used to be located and is no longer correct.
Rather than change to the new address, just remove the paragraph
as it is superfluous anyway. This fixes#311.
* Remove ---- separator lines so that the file headers are barer
and more simplified.
