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/*
* Id: vga.c,v 1.1 1999/11/02 03:54:46 keithp Exp $
*
* 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: xc/programs/Xserver/hw/kdrive/vga.c,v 1.2 1999/12/30 03:03:07 robin Exp $ */
#include "vga.h"
#include <stdio.h>
#ifdef linux
#define extern static
#include <asm/io.h>
#undef extern
#define _VgaInb(r) inb(r)
#define _VgaOutb(v,r) outb(v,r)
#define _VgaByteAddr(a) ((VGAVOL8 *) (a))
#define _VgaBytePort(a) (a)
#endif
#ifdef VXWORKS
#define _VgaInb(r) 0
#define _VgaOutb(v,r) 0
#define _VgaByteAddr(a) ((VGAVOL8 *) ((VGA32) (a) ^ 3))
#define _VgaBytePort(a) 0
#undef stderr
#define stderr stdout
#endif
#undef VGA_DEBUG_REGISTERS
#ifdef VGA_DEBUG_REGISTERS
#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
VgaReadMemb (VGA32 addr)
{
return *_VgaByteAddr(addr);
}
void
VgaWriteMemb (VGA8 v, VGA32 addr)
{
*_VgaByteAddr(addr) = v;
}
VGA8
VgaFetch (VgaCard *card, VGA16 reg)
{
VgaMap map;
VGA8 value;
(*card->map) (card, reg, &map, VGAFALSE);
switch (map.access) {
case VgaAccessMem:
value = VgaReadMemb (map.port);
VGA_DEBUG ((stderr, "%08x -> %2x\n", map.port, value));
break;
case VgaAccessIo:
value = _VgaInb (map.port);
VGA_DEBUG ((stderr, "%4x -> %2x\n", map.port, value));
break;
case VgaAccessIndMem:
VgaWriteMemb (map.index, map.port + map.addr);
value = VgaReadMemb (map.port + map.value);
VGA_DEBUG ((stderr, "%4x/%2x -> %2x\n", map.port, map.index, 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;
map.value = value;
(*card->map) (card, reg, &map, VGATRUE);
switch (map.access) {
case VgaAccessMem:
VGA_DEBUG ((stderr, "%8x <- %2x\n", map.port, value));
VgaWriteMemb (map.value, map.port);
break;
case VgaAccessIo:
VGA_DEBUG ((stderr, "%4x <- %2x\n", map.port, value));
_VgaOutb (value, map.port);
break;
case VgaAccessIndMem:
VgaWriteMemb (map.index, map.port + map.addr);
VgaWriteMemb (value, map.port + map.value);
VGA_DEBUG ((stderr, "%4x/%2x <- %2x\n", map.port, map.index, 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
VgaInvalidate (VgaCard *card)
{
VGA16 id;
for (id = 0; id < card->max; id++)
card->values[id].flags &= ~VGA_VALUE_VALID;
}
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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