ref: af02c3dbfd171f8d8a8da3ebce9cc1af7e31847d
dir: /opl/opl_linux.c/
// // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // DESCRIPTION: // OPL Linux interface. // #include "config.h" #if (defined(__i386__) || defined(__x86_64__)) && defined(HAVE_IOPERM) #include <stdio.h> #include <string.h> #include <errno.h> #include <unistd.h> #include <sys/io.h> #include "opl.h" #include "opl_internal.h" #include "opl_timer.h" static unsigned int opl_port_base; static int OPL_Linux_Init(unsigned int port_base) { // Try to get permissions: if (ioperm(port_base, 2, 1) < 0) { fprintf(stderr, "Failed to get I/O port permissions for 0x%x: %s\n", port_base, strerror(errno)); if (errno == EPERM) { fprintf(stderr, "\tYou may need to run the program as root in order\n" "\tto acquire I/O port permissions for OPL MIDI playback.\n"); } return 0; } opl_port_base = port_base; // Start callback thread if (!OPL_Timer_StartThread()) { ioperm(port_base, 2, 0); return 0; } return 1; } static void OPL_Linux_Shutdown(void) { // Stop callback thread OPL_Timer_StopThread(); // Release permissions ioperm(opl_port_base, 2, 0); } static unsigned int OPL_Linux_PortRead(opl_port_t port) { return inb(opl_port_base + port); } static void OPL_Linux_PortWrite(opl_port_t port, unsigned int value) { outb(value, opl_port_base + port); } opl_driver_t opl_linux_driver = { "Linux", OPL_Linux_Init, OPL_Linux_Shutdown, OPL_Linux_PortRead, OPL_Linux_PortWrite, OPL_Timer_SetCallback, OPL_Timer_ClearCallbacks, OPL_Timer_Lock, OPL_Timer_Unlock, OPL_Timer_SetPaused, OPL_Timer_AdjustCallbacks, }; #endif /* #if (defined(__i386__) || defined(__x86_64__)) && defined(HAVE_IOPERM) */