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Diffstat (limited to 'opl/opl_win9x.c')
-rw-r--r-- | opl/opl_win9x.c | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/opl/opl_win9x.c b/opl/opl_win9x.c new file mode 100644 index 00000000..ff527b3e --- /dev/null +++ b/opl/opl_win9x.c @@ -0,0 +1,140 @@ +// Emacs style mode select -*- C++ -*- +//----------------------------------------------------------------------------- +// +// Copyright(C) 2009 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. +// +// You should have received a copy of the GNU General Public License +// along with this program; if not, write to the Free Software +// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA +// 02111-1307, USA. +// +// DESCRIPTION: +// OPL Win9x native interface. +// +//----------------------------------------------------------------------------- + +#include "config.h" + +#ifdef _WIN32 + +#define WIN32_LEAN_AND_MEAN +#include <windows.h> + +#include "opl.h" +#include "opl_internal.h" +#include "opl_timer.h" + +static unsigned int opl_port_base; + +// MingW? + +#if defined(__GNUC__) && defined(__i386__) + +static unsigned int OPL_Win9x_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_Win9x_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" + ); +} + +// TODO: MSVC version +// #elif defined(_MSC_VER) && defined(_M_IX6) ... + +#else + +// Not x86, or don't know how to do port R/W on this compiler. + +#define NO_PORT_RW + +static unsigned int OPL_Win9x_PortRead(opl_port_t port) +{ + return 0; +} + +static void OPL_Win9x_PortWrite(opl_port_t port, unsigned int value) +{ +} + +#endif + +static int OPL_Win9x_Init(unsigned int port_base) +{ +#ifndef NO_PORT_RW + + OSVERSIONINFO version_info; + + // Check that this is a Windows 9x series OS: + + memset(&version_info, 0, sizeof(version_info)); + version_info.dwOSVersionInfoSize = sizeof(version_info); + + GetVersionEx(&version_info); + + if (version_info.dwPlatformId == 1) + { + opl_port_base = port_base; + + // Start callback thread + + return OPL_Timer_StartThread(); + } + +#endif + + return 0; +} + +static void OPL_Win9x_Shutdown(void) +{ + // Stop callback thread + + OPL_Timer_StopThread(); +} + +opl_driver_t opl_win9x_driver = +{ + "Win9x", + OPL_Win9x_Init, + OPL_Win9x_Shutdown, + OPL_Win9x_PortRead, + OPL_Win9x_PortWrite, + OPL_Timer_SetCallback, + OPL_Timer_ClearCallbacks, + OPL_Timer_Lock, + OPL_Timer_Unlock, + OPL_Timer_SetPaused +}; + +#endif /* #ifdef _WIN32 */ + |