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//
// 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 */
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