From d484bfaf001faeb48fee28d046149108ab52a394 Mon Sep 17 00:00:00 2001
From: Simon Howard
Date: Wed, 30 Sep 2009 00:11:44 +0000
Subject: Add Win9x native OPL driver (untested).

Subversion-branch: /branches/opl-branch
Subversion-revision: 1696
---
 opl/Makefile.am |   5 ++-
 opl/opl.c       |   6 +++
 opl/opl_win9x.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 146 insertions(+), 2 deletions(-)
 create mode 100644 opl/opl_win9x.c

diff --git a/opl/Makefile.am b/opl/Makefile.am
index 9a757fdb..8bbed9f0 100644
--- a/opl/Makefile.am
+++ b/opl/Makefile.am
@@ -8,10 +8,11 @@ noinst_LIBRARIES=libopl.a
 libopl_a_SOURCES =                                \
                             opl_internal.h        \
         opl.c               opl.h                 \
-        opl_obsd.c          opl_obsd.h            \
         opl_linux.c                               \
-        opl_sdl.c                                 \
+        opl_obsd.c                                \
         opl_queue.c         opl_queue.h           \
+        opl_sdl.c                                 \
         opl_timer.c         opl_timer.h           \
+        opl_win9x.c                               \
         fmopl.c             fmopl.h
 
diff --git a/opl/opl.c b/opl/opl.c
index 00c9b04a..749c19d1 100644
--- a/opl/opl.c
+++ b/opl/opl.c
@@ -45,6 +45,9 @@ extern opl_driver_t opl_linux_driver;
 #ifdef HAVE_LIBI386
 extern opl_driver_t opl_openbsd_driver;
 #endif
+#ifdef _WIN32
+extern opl_driver_t opl_win9x_driver;
+#endif
 extern opl_driver_t opl_sdl_driver;
 
 static opl_driver_t *drivers[] =
@@ -54,6 +57,9 @@ static opl_driver_t *drivers[] =
 #endif
 #ifdef HAVE_LIBI386
     &opl_openbsd_driver,
+#endif
+#ifdef _WIN32
+    &opl_win9x_driver,
 #endif
     &opl_sdl_driver,
     NULL
diff --git a/opl/opl_win9x.c b/opl/opl_win9x.c
new file mode 100644
index 00000000..04555760
--- /dev/null
+++ b/opl/opl_win9x.c
@@ -0,0 +1,137 @@
+// 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:
+
+    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 */
+
-- 
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