Initial. Don't... just don't ask.

obsolete/svpmi/svpmi.c

@@ -0,0 +1,185 @@
+/* This library is free software; you can redistribute it and/or   */
+/* modify it without any restrictions. This library is distributed */
+/* in the hope that it will be useful, but without any warranty.   */
+
+/* Copyright (C) 1994 Harm Hanemaayer */
+
+/*
+   Basic initial untested SVPMI skeleton driver.
+   Includes computer-generated mode setting/bank switching
+   routines and mode information table.
+
+   Untested, may not be finished.
+
+   A better way to do this would be to have a seperate svpmi server
+   program      set modes. This way there would be no need to recompile
+   the shared library. For performance it would be nice to move the
+   bank-switching over to svgalib. I imagine one way to do this would
+   be to encode the SVPMI procedure code (simple as it is, just a few
+   outs and a few basic bit operations) and have the svgalib driver
+   interpret that. This could also be used for mode setting.
+ */
+
+
+#include <stdio.h>
+#include "../vga.h"
+#include "../libvga.h"
+#include "../driver.h"
+
+#include "svpmi.h"
+#include "modes.svpmi"
+#include "modetable.svpmi"
+
+
+
+static svpmi_currentmode = NULL;
+
+static svpmi_modeentry *
+svpmi_lookupmode (int w, int h, int colors)
+{
+  int i;
+  for (i = 0; i < sizeof (svpmi_modes); i++)
+    if (w == svpmi_modes[i].width && h == svpmi_modes[i].height &&
+	colors = (1 << svpmi_mode[i].bitsperpixel))
+      return &svpmi_modes[i];
+  return NULL;
+}
+
+
+static int
+svpmi_getmodeinfo (int mode, vga_modeinfo * modeinfo)
+{
+  modeinfo->maxlogicalwidth = modeinfo->width;
+  modeinfo->startaddressrange = 0;
+  modeinfo->haveblit = 0;
+  modeinfo->flags &= ~HAVE_RWPAGE;
+  return 0;
+}
+
+
+/* Return non-zero if mode is available */
+
+static int
+svpmi_modeavailable (int mode)
+{
+  struct info *info;
+  svpmi_modeentry *sm;
+
+  if (mode < 10)
+    return vga_chipsetfunctions[CHIPSET_MODEAVAILABLE] (mode);
+  if (mode == 32)
+    return 0;
+
+  sm = svpmi_lookupmode (modeinfo->width, modeinfo->height,
+			 modeinfo->colors);
+  return (sm != NULL)
+}
+
+
+/* Set a mode */
+
+static int
+svpmi_setmode (int mode, int prv_mode)
+{
+  svpmi_modeentry *sm;
+
+  if (mode == TEXT)
+    {
+      svpmi_setmode_text ();
+      return 0;
+    }
+
+  if (!SVGAMODE (mode))
+    /* Let the standard VGA driver set standard VGA modes. */
+    return vga_chipsetfunctions[CHIPSET_SETMODE] (mode);
+
+  sm = svpmi_lookupmode (infotable[mode].width, infotable[mode].height,
+			 infotable[mode].colors);
+  if (sm == NULL)
+    return 1;			/* No match. */
+
+  sm->setmode ();		/* Call the SVPMI mode setting code. */
+  svpmi_currentmode = sm;
+
+  /* Hack similar to what the ATI mach32 driver does for some */
+  /* truecolor modes. I think S3 uses only a few fixed scanline */
+  /* widths (e.g. 1024, 1280) so may happen a lot. */
+  infotable[mode].xbytes = sm->bytesperscanline;
+}
+
+
+/* Indentify chipset; return non-zero if detected */
+
+static int
+svpmi_test ()
+{
+  /* Detection with environment variable -- better change into */
+  /* config file option. */
+  if (getenv ("SVGALIB_SVPMI"))
+    return 1;
+  return 0;
+}
+
+
+/* Bank switching function - set 64K bank number */
+
+static void
+svpmi_setpage (int page)
+{
+  svpmi_currentmode->setwindow (page *
+				(64 / svpmi_currentmode->windowgranularity));
+}
+
+
+/* Set display start address (not for 16 color modes) */
+
+static int
+svpmi_setdisplaystart (int address)
+{
+}
+
+
+/* Set logical scanline length (usually multiple of 8) */
+/* Multiples of 8 to 2040 */
+
+static int
+svpmi_setlogicalwidth (int width)
+{
+  outw (0x3d4, 0x13 + (width >> 3) * 256);	/* lw3-lw11 */
+  return 0;
+}
+
+static int
+nothing ()
+{
+}
+
+
+/* Function table (exported) */
+
+int (*svpmi_chipsetfunctions[]) () =
+{
+  (int (*)()) nothing,		/* saveregs */
+    (int (*)()) nothing,	/* setregs */
+    (int (*)()) nothing,	/* unlock */
+    (int (*)()) nothing,	/* lock */
+    svpmi_test,
+    svpmi_init,
+    (int (*)()) svpmi_setpage,
+    (int (*)()) nothing,
+    (int (*)()) nothing,
+    svpmi_setmode,
+    svpmi_modeavailable,
+    nothing,			/* setdisplaystart */
+    svmi_setlogicalwidth,
+    svpmi_getmodeinfo
+};
+
+
+/* Initialize chipset (called after detection) */
+
+static int
+svpmi_init (int force, int par1, int par2)
+{
+  /* Not required. */
+}