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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/*
* This code is based on original Soltys source code
* Copyright (c) 1994-1995 Janus B. Wisniewski and L.K. Avalon
*/
#include "cge/general.h"
namespace CGE {
#define EMS_INT 0x67
#define PAGE_MASK 0x3FFF
#define SIZ(n) ((n) ? ((long)n) : (0x10000L))
enum EMM_FUN { GET_STATUS = 0x40,
GET_FRAME,
GET_SIZE,
OPEN_HANDLE,
MAP_PAGE,
CLOSE_HANDLE,
GET_VER,
SAVE_CONTEXT,
REST_CONTEXT,
GET_PAGES = 0x4B,
GET_HANDLES,
GET_INFO,
CONTROL };
void *EMM::Frame = NULL;
EMM::EMM (long size): Han(-1), Top(0), Lim(0), List(NULL) {
/*
if (Test())
{
asm mov ah,GET_FRAME // get EMS frame segment
asm int EMS_INT // do it!
asm or ah,ah // see status
asm jnz xit // abort on error
Frame = (void _seg *) _BX; // save frame segment
if (size == 0)
{
asm mov ah,GET_SIZE // get EMS memory size
asm int EMS_INT // do it!
asm or ah,ah // see status
asm jnz xit // abort on error
asm or bx,bx // test page count
asm jz xit // abort if no free pages
// number of available pages in BX is ready to use by OPEN
}
else _BX = (uint16) ((size + PAGE_MASK) >> 14);
asm mov ah,OPEN_HANDLE // open EMM handle
asm int EMS_INT // do it!
asm or ah,ah // see status
asm jnz xit // abort on error
Han = _DX;
Lim = _BX;
Lim <<= 14;
_DX = Han;
asm mov ah,SAVE_CONTEXT // save mapping context
asm int EMS_INT // do it!
}
xit:
*/
warning("STUB: EMM:EMM");
}
EMM::~EMM(void) {
/*
Release();
if (Han >= 0)
{
_DX = Han;
asm mov ah,REST_CONTEXT
asm int EMS_INT
asm mov ah,CLOSE_HANDLE
asm int EMS_INT
}
*/
warning("STUB: EMM::~EMM");
}
bool EMM::Test(void) {
/*
static char e[] = "EMMXXXX0";
asm mov ax,0x3D40
asm mov dx,offset e
asm int 0x21
asm jc fail
asm push ax
asm mov bx,ax
asm mov ax,0x4407
asm int 0x21
asm pop bx
asm push ax
asm mov ax,0x3E00
asm int 0x21
asm pop ax
asm cmp al,0x00
asm je fail
success:
return TRUE;
fail:
return FALSE;
*/
warning("EMM::Test");
return FALSE;
}
EMS * EMM::Alloc (uint16 siz) {
/*
long size = SIZ(siz),
top = Top;
uint16 pgn = (uint16) (top >> 14),
cnt = (uint16) ((top + size + PAGE_MASK) >> 14) - pgn;
if (cnt > 4)
{
top = (top + PAGE_MASK) & 0xFFFFC000L;
++ pgn;
-- cnt;
}
if (size <= Lim - top)
{
EMS * e = new EMS, * f;
if (e)
{
Top = (e->Ptr = top) + (e->Siz = siz);
e->Emm = this;
if (List)
{
for (f = List; f->Nxt; f = f->Nxt);
return (f->Nxt = e); // existing list: link to the end
}
else
{
return (List = e); // empty list: link to the head
}
}
}
fail: return NULL;
*/
warning("STUB: EMM::Alloc");
return NULL;
}
void EMM::Release (void) {
while (List)
{
EMS * e = List;
List = e->Nxt;
delete e;
}
Top = 0;
}
EMS::EMS (void)
: Ptr(0), Siz(0), Nxt(NULL)
{
}
void * EMS::operator & () const
{
/*
uint16 pgn = (uint16) (Ptr >> 14),
off = (uint16) Ptr & PAGE_MASK,
cnt = (uint16) ((Ptr + SIZ(Siz) + PAGE_MASK) >> 14) - pgn,
cmd = MAP_PAGE << 8;
_DX = Emm->Han; // take EMM handle
asm dec cnt // prapare for deferred checking
asm or dx,dx // see if valid
asm jns more // negative handle = unavailable
fail: return NULL;
more:
asm mov ax,cmd // command + page frame index
asm mov bx,pgn // logical page number
asm int EMS_INT // do it!
asm or ah,ah // check error code
asm jnz fail // exit on error
asm inc cmd // advance page frame index
asm inc pgn // advance logical page number
asm cmp al,byte ptr cnt // all pages?
asm jb more
return (void *) (EMM::Frame + (void *) off);
*/
warning("STUB: EMS::operator &");
return NULL;
}
uint16 EMS::Size (void)
{
return Siz;
}
} // End of namespace CGE
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