ref: e96a59cceea7b516b7911ecf0a18f5ac1c09bc31
dir: /opl/opl_win32.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 Win32 native interface. // #include "config.h" #ifdef _WIN32 #include <stdio.h> #define WIN32_LEAN_AND_MEAN #include <windows.h> #include "opl.h" #include "opl_internal.h" #include "opl_timer.h" #include "ioperm_sys.h" static unsigned int opl_port_base; // MingW? #if defined(__GNUC__) && defined(__i386__) static unsigned int OPL_Win32_PortRead(opl_port_t port) { unsigned char result; __asm__ volatile ( "movl %1, %%edx\n" "inb %%dx, %%al\n" "movb %%al, %0" : "=m" (result) : "r" (opl_port_base + port) : "edx", "al", "memory" ); return result; } static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value) { __asm__ volatile ( "movl %0, %%edx\n" "movb %1, %%al\n" "outb %%al, %%dx" : : "r" (opl_port_base + port), "r" ((unsigned char) value) : "edx", "al" ); } // haleyjd 20110417: MSVC version #elif defined(_MSC_VER) && defined(_M_IX86) static unsigned int OPL_Win32_PortRead(opl_port_t port) { unsigned char result; opl_port_t dst_port = opl_port_base + port; __asm { mov edx, dword ptr [dst_port] in al, dx mov byte ptr [result], al } return result; } static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value) { opl_port_t dst_port = opl_port_base + port; __asm { mov edx, dword ptr [dst_port] mov al, byte ptr [value] out dx, al } } #else // Not x86, or don't know how to do port R/W on this compiler. #define NO_PORT_RW static unsigned int OPL_Win32_PortRead(opl_port_t port) { return 0; } static void OPL_Win32_PortWrite(opl_port_t port, unsigned int value) { } #endif static int OPL_Win32_Init(unsigned int port_base) { #ifndef NO_PORT_RW OSVERSIONINFO version_info; opl_port_base = port_base; // Check the OS version. memset(&version_info, 0, sizeof(version_info)); version_info.dwOSVersionInfoSize = sizeof(version_info); GetVersionEx(&version_info); // On NT-based systems, we must acquire I/O port permissions // using the ioperm.sys driver. if (version_info.dwPlatformId == VER_PLATFORM_WIN32_NT) { // Install driver. if (!IOperm_InstallDriver()) { return 0; } // Open port range. if (!IOperm_EnablePortRange(opl_port_base, 2, 1)) { IOperm_UninstallDriver(); return 0; } } // Start callback thread if (!OPL_Timer_StartThread()) { IOperm_UninstallDriver(); return 0; } return 1; #endif return 0; } static void OPL_Win32_Shutdown(void) { // Stop callback thread OPL_Timer_StopThread(); // Unload IOperm library. IOperm_UninstallDriver(); } opl_driver_t opl_win32_driver = { "Win32", OPL_Win32_Init, OPL_Win32_Shutdown, OPL_Win32_PortRead, OPL_Win32_PortWrite, OPL_Timer_SetCallback, OPL_Timer_ClearCallbacks, OPL_Timer_Lock, OPL_Timer_Unlock, OPL_Timer_SetPaused, OPL_Timer_AdjustCallbacks, }; #endif /* #ifdef _WIN32 */