2e855ffeb6
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.
103 lines
2.3 KiB
C
103 lines
2.3 KiB
C
//
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// Copyright(C) 2005-2014 Simon Howard
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// DESCRIPTION:
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// OPL Linux interface.
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//
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#include "config.h"
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#if (defined(__i386__) || defined(__x86_64__)) && defined(HAVE_IOPERM)
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/io.h>
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#include "opl.h"
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#include "opl_internal.h"
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#include "opl_timer.h"
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static unsigned int opl_port_base;
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static int OPL_Linux_Init(unsigned int port_base)
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{
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// Try to get permissions:
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if (ioperm(port_base, 2, 1) < 0)
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{
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fprintf(stderr, "Failed to get I/O port permissions for 0x%x: %s\n",
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port_base, strerror(errno));
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if (errno == EPERM)
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{
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fprintf(stderr,
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"\tYou may need to run the program as root in order\n"
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"\tto acquire I/O port permissions for OPL MIDI playback.\n");
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}
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return 0;
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}
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opl_port_base = port_base;
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// Start callback thread
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if (!OPL_Timer_StartThread())
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{
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ioperm(port_base, 2, 0);
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return 0;
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}
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return 1;
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}
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static void OPL_Linux_Shutdown(void)
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{
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// Stop callback thread
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OPL_Timer_StopThread();
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// Release permissions
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ioperm(opl_port_base, 2, 0);
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}
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static unsigned int OPL_Linux_PortRead(opl_port_t port)
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{
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return inb(opl_port_base + port);
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}
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static void OPL_Linux_PortWrite(opl_port_t port, unsigned int value)
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{
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outb(value, opl_port_base + port);
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}
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opl_driver_t opl_linux_driver =
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{
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"Linux",
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OPL_Linux_Init,
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OPL_Linux_Shutdown,
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OPL_Linux_PortRead,
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OPL_Linux_PortWrite,
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OPL_Timer_SetCallback,
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OPL_Timer_ClearCallbacks,
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OPL_Timer_Lock,
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OPL_Timer_Unlock,
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OPL_Timer_SetPaused,
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OPL_Timer_AdjustCallbacks,
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};
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#endif /* #if (defined(__i386__) || defined(__x86_64__)) && defined(HAVE_IOPERM) */
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