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-rw-r--r--hw/kdrive/src/vga.c288
1 files changed, 288 insertions, 0 deletions
diff --git a/hw/kdrive/src/vga.c b/hw/kdrive/src/vga.c
new file mode 100644
index 000000000..0e0c53878
--- /dev/null
+++ b/hw/kdrive/src/vga.c
@@ -0,0 +1,288 @@
+/*
+ * $Id$
+ *
+ * Copyright © 1999 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of Keith Packard not be used in
+ * advertising or publicity pertaining to distribution of the software without
+ * specific, written prior permission. Keith Packard makes no
+ * representations about the suitability of this software for any purpose. It
+ * is provided "as is" without express or implied warranty.
+ *
+ * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+/* $XFree86: $ */
+
+#include "vga.h"
+#include <stdio.h>
+
+#ifdef linux
+#define extern
+#include <asm/io.h>
+#undef extern
+
+#define _VgaInb(r) inb(r)
+#define _VgaOutb(v,r) outb(v,r)
+
+#endif
+
+#if 0
+#define VGA_DEBUG(a) fprintf a
+#else
+#define VGA_DEBUG(a)
+#endif
+
+VGA8
+VgaInb (VGA16 r)
+{
+ return _VgaInb(r);
+}
+
+void
+VgaOutb (VGA8 v, VGA16 r)
+{
+ _VgaOutb (v,r);
+}
+
+VGA8
+VgaFetch (VgaCard *card, VGA16 reg)
+{
+ VgaMap map;
+ VGAVOL8 *mem;
+ VGA8 value;
+
+ (*card->map) (card, reg, &map, VGAFALSE);
+ switch (map.access) {
+ case VgaAccessMem:
+ mem = (VGAVOL8 *) map.port;
+ value = *mem;
+ break;
+ case VgaAccessIo:
+ value = _VgaInb (map.port);
+ VGA_DEBUG ((stderr, "%4x -> %2x\n", map.port, value));
+ break;
+ case VgaAccessIndMem:
+ mem = (VGAVOL8 *) map.port;
+ mem[map.addr] = map.index;
+ value = mem[map.value];
+ break;
+ case VgaAccessIndIo:
+ _VgaOutb (map.index, map.port + map.addr);
+ value = _VgaInb (map.port + map.value);
+ VGA_DEBUG ((stderr, "%4x/%2x -> %2x\n", map.port, map.index, value));
+ break;
+ case VgaAccessDone:
+ value = map.value;
+ VGA_DEBUG ((stderr, "direct %4x -> %2x\n", reg, value));
+ break;
+ }
+ return value;
+}
+
+void
+VgaStore (VgaCard *card, VGA16 reg, VGA8 value)
+{
+ VgaMap map;
+ VGAVOL8 *mem;
+
+ map.value = value;
+ (*card->map) (card, reg, &map, VGATRUE);
+ switch (map.access) {
+ case VgaAccessMem:
+ mem = (VGAVOL8 *) map.port;
+ *mem = value;
+ break;
+ case VgaAccessIo:
+ VGA_DEBUG ((stderr, "%4x <- %2x\n", map.port, value));
+ _VgaOutb (value, map.port);
+ break;
+ case VgaAccessIndMem:
+ mem = (VGAVOL8 *) map.port;
+ mem[map.addr] = map.index;
+ mem[map.value] = value;
+ break;
+ case VgaAccessIndIo:
+ VGA_DEBUG ((stderr, "%4x/%2x <- %2x\n", map.port, map.index, value));
+ _VgaOutb (map.index, map.port + map.addr);
+ _VgaOutb (value, map.port + map.value);
+ break;
+ case VgaAccessDone:
+ VGA_DEBUG ((stderr, "direct %4x <- %2x\n", reg, value));
+ break;
+ }
+}
+
+void
+VgaPreserve (VgaCard *card)
+{
+ VgaSave *s;
+ VGA16 id;
+
+ for (s = card->saves; s->first != VGA_REG_NONE; s++)
+ {
+ for (id = s->first; id <= s->last; id++)
+ {
+ card->values[id].cur = VgaFetch (card, id);
+ card->values[id].save = card->values[id].cur;
+ card->values[id].flags = VGA_VALUE_VALID | VGA_VALUE_SAVED;
+ }
+ }
+}
+
+void
+VgaRestore (VgaCard *card)
+{
+ VgaSave *s;
+ VGA16 id;
+
+ for (s = card->saves; s->first != VGA_REG_NONE; s++)
+ {
+ for (id = s->first; id <= s->last; id++)
+ {
+ if (card->values[id].flags & VGA_VALUE_SAVED)
+ {
+ VgaStore (card, id, card->values[id].save);
+ card->values[id].cur = card->values[id].save;
+ }
+ }
+ }
+}
+
+void
+VgaFinish (VgaCard *card)
+{
+ VGA16 id;
+
+ for (id = 0; id < card->max; id++)
+ card->values[id].flags = 0;
+}
+
+void
+_VgaSync (VgaCard *card, VGA16 id)
+{
+ if (!(card->values[id].flags & VGA_VALUE_VALID))
+ {
+ card->values[id].cur = VgaFetch (card, id);
+ card->values[id].flags |= VGA_VALUE_VALID;
+ }
+}
+
+void
+VgaSet (VgaCard *card, VgaReg *reg, VGA32 value)
+{
+ VGA8 v, mask, new;
+
+ while (reg->len)
+ {
+ if (reg->id != VGA_REG_NONE)
+ {
+ _VgaSync (card, reg->id);
+ mask = ((1 << reg->len) - 1);
+ new = value & mask;
+ mask <<= reg->base;
+ new <<= reg->base;
+ v = card->values[reg->id].cur;
+ v = v & ~mask | new;
+ card->values[reg->id].cur = v;
+ card->values[reg->id].flags |= VGA_VALUE_MODIFIED|VGA_VALUE_DIRTY;
+ }
+ value >>= reg->len;
+ reg++;
+ }
+}
+
+void
+VgaFlushReg (VgaCard *card, VgaReg *reg)
+{
+ while (reg->len)
+ {
+ if (reg->id != VGA_REG_NONE)
+ {
+ if (card->values[reg->id].flags & VGA_VALUE_DIRTY)
+ {
+ VgaStore (card, reg->id, card->values[reg->id].cur);
+ card->values[reg->id].flags &= ~VGA_VALUE_DIRTY;
+ }
+ }
+ reg++;
+ }
+
+}
+
+void
+VgaSetImm (VgaCard *card, VgaReg *reg, VGA32 value)
+{
+ VgaSet (card, reg, value);
+ VgaFlushReg (card, reg);
+}
+
+VGA32
+VgaGet (VgaCard *card, VgaReg *reg)
+{
+ VGA32 value, offset, v;
+ VGA8 mask;
+
+ value = 0;
+ offset = 0;
+ while (reg->len)
+ {
+ if (reg->id != VGA_REG_NONE)
+ {
+ _VgaSync (card, reg->id);
+ mask = ((1 << reg->len) - 1);
+ v = (card->values[reg->id].cur >> reg->base) & mask;
+ value |= (v << offset);
+ }
+ offset += reg->len;
+ reg++;
+ }
+ return value;
+}
+
+VGA32
+VgaGetImm (VgaCard *card, VgaReg *reg)
+{
+ VgaReg *r = reg;
+
+ while (r->len)
+ {
+ if (r->id != VGA_REG_NONE)
+ card->values[r->id].flags &= ~VGA_VALUE_VALID;
+ r++;
+ }
+ return VgaGet (card, reg);
+}
+
+void
+VgaFlush (VgaCard *card)
+{
+ VGA16 id;
+
+ for (id = 0; id < card->max; id++)
+ {
+ if (card->values[id].flags & VGA_VALUE_DIRTY)
+ {
+ VgaStore (card, id, card->values[id].cur);
+ card->values[id].flags &= ~VGA_VALUE_DIRTY;
+ }
+ }
+}
+
+void
+VgaFill (VgaCard *card, VGA16 low, VGA16 high)
+{
+ VGA16 id;
+
+ for (id = low; id < high; id++)
+ _VgaSync (card, id);
+}
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