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Sweden-Number/dlls/winedos/int67.c

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/*
* Int67 (EMS) emulation
*
* Copyright 2002 Jukka Heinonen
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include "wine/winbase16.h"
#include "dosexe.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
/*
* EMS page size == 16 kilobytes.
*/
#define EMS_PAGE_SIZE (16*1024)
/*
* Linear address of EMS page.
*/
#define EMS_PAGE_ADDRESS(base,page) (((char*)base) + EMS_PAGE_SIZE * page)
/*
* Maximum number of pages that can be allocated using EMS.
*/
#define EMS_MAX_PAGES 1024
/*
* Maximum number of EMS handles (allocated blocks).
*/
#define EMS_MAX_HANDLES 256
/*
* Global EMM Import Record.
* Applications can get address of this record
* and directly access allocated memory if they use
* IOCTL interface.
*
* FIXME: Missing lots of fields, packing is not correct.
*/
static struct {
struct {
UCHAR hindex; /* handle number */
BYTE flags; /* bit 0: normal handle rather than system handle */
char name[8]; /* handle name */
WORD pages; /* allocated pages */
void *address; /* physical address*/
} handle[EMS_MAX_HANDLES];
/* Wine specific fields... */
int used_pages; /* Number of allocated pages. */
void *frame_address; /* Address of 64k EMS page frame */
WORD frame_selector; /* Segment of 64k EMS page frame */
struct {
UCHAR hindex; /* handle number */
WORD logical_page; /* logical page */
} mapping[4];
struct {
UCHAR hindex; /* handle number */
WORD logical_page; /* logical page */
} mapping_save_area[EMS_MAX_HANDLES][4];
} *EMS_record;
/**********************************************************************
* EMS_init
*
* Allocates and initialized page frame and EMS global import record.
*/
static void EMS_init(void)
{
/*
* Start of 64k EMS frame.
*/
ULONG base = 0xc0000;
if(EMS_record)
return;
EMS_record = HeapAlloc(GetProcessHeap(),
HEAP_ZERO_MEMORY,
sizeof(*EMS_record));
EMS_record->frame_address = (void *)base;
EMS_record->frame_selector = base >> 4;
}
/**********************************************************************
* EMS_alloc
*
* Get handle and allocate memory.
*/
static void EMS_alloc( CONTEXT86 *context )
{
int hindex = 1; /* handle zero is reserved for system */
while(hindex < EMS_MAX_HANDLES && EMS_record->handle[hindex].address)
hindex++;
if(hindex == EMS_MAX_HANDLES) {
SET_AH( context, 0x85 ); /* status: no more handles available */
} else {
int pages = BX_reg(context);
void *buffer = HeapAlloc( GetProcessHeap(), 0, pages * EMS_PAGE_SIZE );
if(!buffer) {
SET_AH( context, 0x88 ); /* status: insufficient pages available */
} else {
EMS_record->handle[hindex].address = buffer;
EMS_record->handle[hindex].pages = pages;
EMS_record->used_pages += pages;
SET_DX( context, hindex ); /* handle to allocated memory*/
SET_AH( context, 0 ); /* status: ok */
}
}
}
/**********************************************************************
* EMS_access_name
*
* Get/set handle name.
*/
static void EMS_access_name( CONTEXT86 *context )
{
char *ptr;
int hindex = DX_reg(context);
if(hindex < 0 || hindex >= EMS_MAX_HANDLES) {
SET_AH( context, 0x83 ); /* invalid handle */
return;
}
switch AL_reg(context) {
case 0x00: /* get name */
ptr = PTR_REAL_TO_LIN(context->SegEs, DI_reg(context));
memcpy(ptr, EMS_record->handle[hindex].name, 8);
SET_AH( context, 0 );
break;
case 0x01: /* set name */
ptr = PTR_REAL_TO_LIN(context->SegDs, SI_reg(context));
memcpy(EMS_record->handle[hindex].name, ptr, 8);
SET_AH( context, 0 );
break;
default:
INT_BARF(context,0x67);
break;
}
}
/**********************************************************************
* EMS_map
*
* Map logical page into physical page.
*/
static BYTE EMS_map( WORD physical_page, WORD new_hindex, WORD new_logical_page )
{
int old_hindex;
int old_logical_page;
void *physical_address;
if(physical_page > 3)
return 0x8b; /* status: invalid physical page */
old_hindex = EMS_record->mapping[physical_page].hindex;
old_logical_page = EMS_record->mapping[physical_page].logical_page;
physical_address = EMS_PAGE_ADDRESS(EMS_record->frame_address, physical_page);
/* unmap old page */
if(old_hindex) {
void *ptr = EMS_PAGE_ADDRESS(EMS_record->handle[old_hindex].address,
old_logical_page);
memcpy(ptr, physical_address, EMS_PAGE_SIZE);
}
/* map new page */
if(new_hindex && new_logical_page != 0xffff) {
void *ptr = EMS_PAGE_ADDRESS(EMS_record->handle[new_hindex].address,
new_logical_page);
if(new_hindex >= EMS_MAX_HANDLES || !EMS_record->handle[new_hindex].address)
return 0x83; /* status: invalid handle */
if(new_logical_page >= EMS_record->handle[new_hindex].pages)
return 0x8a; /* status: invalid logical page */
memcpy(physical_address, ptr, EMS_PAGE_SIZE);
EMS_record->mapping[physical_page].hindex = new_hindex;
EMS_record->mapping[physical_page].logical_page = new_logical_page;
} else {
EMS_record->mapping[physical_page].hindex = 0;
EMS_record->mapping[physical_page].logical_page = 0;
}
return 0; /* status: ok */
}
/**********************************************************************
* EMS_map_multiple
*
* Map multiple logical pages into physical pages.
*/
static void EMS_map_multiple( CONTEXT86 *context )
{
WORD *ptr = PTR_REAL_TO_LIN(context->SegDs, SI_reg(context));
BYTE status = 0;
int i;
for(i=0; i<CX_reg(context) && !status; i++, ptr += 2)
switch(AL_reg(context)) {
case 0x00:
status = EMS_map( ptr[1],
DX_reg(context), ptr[0] );
break;
case 0x01:
status = EMS_map( (ptr[1] - EMS_record->frame_selector) >> 10,
DX_reg(context), ptr[0] );
break;
default:
status = 0x8f; /* status: undefined subfunction */
}
SET_AH( context, status );
}
/**********************************************************************
* EMS_free
*
* Free memory and release handle.
*/
static void EMS_free( CONTEXT86 *context )
{
int hindex = DX_reg(context);
int i;
if(hindex < 0 || hindex >= EMS_MAX_HANDLES) {
SET_AH( context, 0x83 ); /* status: invalid handle */
return;
}
if(!EMS_record->handle[hindex].address) {
SET_AH( context, 0 ); /* status: ok */
return;
}
EMS_record->used_pages -= EMS_record->handle[hindex].pages;
/* unmap pages */
for(i=0; i<4; i++)
if(EMS_record->mapping[i].hindex == hindex)
EMS_record->mapping[i].hindex = 0;
/* free block */
HeapFree( GetProcessHeap(), 0, EMS_record->handle[hindex].address );
EMS_record->handle[hindex].address = 0;
SET_AH( context, 0 ); /* status: ok */
}
/**********************************************************************
* EMS_save_context
*
* Save physical page mappings into handle specific save area.
*/
static void EMS_save_context( CONTEXT86 *context )
{
WORD h = DX_reg(context);
int i;
for(i=0; i<4; i++) {
EMS_record->mapping_save_area[h][i].hindex = EMS_record->mapping[i].hindex;
EMS_record->mapping_save_area[h][i].logical_page = EMS_record->mapping[i].logical_page;
}
SET_AX( context, 0 ); /* status: ok */
}
/**********************************************************************
* EMS_restore_context
*
* Restore physical page mappings from handle specific save area.
*/
static void EMS_restore_context( CONTEXT86 *context )
{
WORD handle = DX_reg(context);
int i;
for(i=0; i<4; i++) {
int hindex = EMS_record->mapping_save_area[handle][i].hindex;
int logical_page = EMS_record->mapping_save_area[handle][i].logical_page;
if(EMS_map( i, hindex, logical_page )) {
SET_AX( context, 0x8e ); /* status: restore of mapping context failed */
return;
}
}
SET_AX( context, 0 ); /* status: ok */
}
/**********************************************************************
* DOSVM_Int67Handler (WINEDOS16.203)
*
* Handler for interrupt 67h EMS routines.
*/
void WINAPI DOSVM_Int67Handler( CONTEXT86 *context )
{
switch AH_reg(context) {
case 0x40: /* EMS - GET MANAGER STATUS */
SET_AH( context, 0 ); /* status: ok */
break;
case 0x41: /* EMS - GET PAGE FRAME SEGMENT */
EMS_init();
SET_BX( context, EMS_record->frame_selector ); /* segment of page frame */
SET_AH( context, 0 ); /* status: ok */
break;
case 0x42: /* EMS - GET NUMBER OF PAGES */
EMS_init();
/* unallocated 16k pages */
SET_BX( context, EMS_MAX_PAGES - EMS_record->used_pages );
/* total number of 16k pages */
SET_DX( context, EMS_MAX_PAGES );
/* status: ok */
SET_AH( context, 0 );
break;
case 0x43: /* EMS - GET HANDLE AND ALLOCATE MEMORY */
EMS_init();
EMS_alloc(context);
break;
case 0x44: /* EMS - MAP MEMORY */
EMS_init();
SET_AH( context, EMS_map( AL_reg(context), DX_reg(context), BX_reg(context) ) );
break;
case 0x45: /* EMS - RELEASE HANDLE AND MEMORY */
EMS_init();
EMS_free(context);
break;
case 0x46: /* EMS - GET EMM VERSION */
SET_AL( context, 0x40 ); /* version 4.0 */
SET_AH( context, 0 ); /* status: ok */
break;
case 0x47: /* EMS - SAVE MAPPING CONTEXT */
EMS_init();
EMS_save_context(context);
break;
case 0x48: /* EMS - RESTORE MAPPING CONTEXT */
EMS_init();
EMS_restore_context(context);
break;
case 0x49: /* EMS - reserved - GET I/O PORT ADDRESSES */
case 0x4a: /* EMS - reserved - GET TRANSLATION ARRAY */
INT_BARF(context,0x67);
break;
case 0x4b: /* EMS - GET NUMBER OF EMM HANDLES */
SET_BX( context, EMS_MAX_HANDLES ); /* EMM handles */
SET_AH( context, 0 ); /* status: ok */
break;
case 0x4c: /* EMS - GET PAGES OWNED BY HANDLE */
case 0x4d: /* EMS - GET PAGES FOR ALL HANDLES */
case 0x4e: /* EMS - GET OR SET PAGE MAP */
case 0x4f: /* EMS 4.0 - GET/SET PARTIAL PAGE MAP */
INT_BARF(context,0x67);
break;
case 0x50: /* EMS 4.0 - MAP/UNMAP MULTIPLE HANDLE PAGES */
EMS_init();
EMS_map_multiple(context);
break;
case 0x51: /* EMS 4.0 - REALLOCATE PAGES */
case 0x52: /* EMS 4.0 - GET/SET HANDLE ATTRIBUTES */
INT_BARF(context,0x67);
break;
case 0x53: /* EMS 4.0 - GET/SET HANDLE NAME */
EMS_init();
EMS_access_name(context);
break;
case 0x54: /* EMS 4.0 - GET HANDLE DIRECTORY */
case 0x55: /* EMS 4.0 - ALTER PAGE MAP AND JUMP */
case 0x56: /* EMS 4.0 - ALTER PAGE MAP AND CALL */
case 0x57: /* EMS 4.0 - MOVE/EXCHANGE MEMORY REGION */
case 0x58: /* EMS 4.0 - GET MAPPABLE PHYSICAL ADDRESS ARRAY */
INT_BARF(context,0x67);
break;
case 0x59: /* EMS 4.0 - GET EXPANDED MEMORY HARDWARE INFORMATION */
if(AL_reg(context) == 0x01) {
EMS_init();
/* unallocated raw pages */
SET_BX( context, EMS_MAX_PAGES - EMS_record->used_pages );
/* total number raw pages */
SET_DX( context, EMS_MAX_PAGES );
/* status: ok */
SET_AH( context, 0 );
} else
INT_BARF(context,0x67);
break;
case 0x5a: /* EMS 4.0 - ALLOCATE STANDARD/RAW PAGES */
case 0x5b: /* EMS 4.0 - ALTERNATE MAP REGISTER SET */
case 0x5c: /* EMS 4.0 - PREPARE EXPANDED MEMORY HARDWARE FOR WARM BOOT */
case 0x5d: /* EMS 4.0 - ENABLE/DISABLE OS FUNCTION SET FUNCTIONS */
INT_BARF(context,0x67);
break;
case 0xde: /* Virtual Control Program Interface (VCPI) */
if(AL_reg(context) == 0x00) {
/*
* VCPI INSTALLATION CHECK
* (AH_reg() != 0) means VCPI is not present
*/
TRACE("- VCPI installation check\n");
return;
} else
INT_BARF(context,0x67);
break;
default:
INT_BARF(context,0x67);
}
}
/**********************************************************************
* EMS_Ioctl_Handler
*
* Handler for interrupt 21h IOCTL routine for device "EMMXXXX0".
*/
void WINAPI EMS_Ioctl_Handler( CONTEXT86 *context )
{
assert(AH_reg(context) == 0x44);
switch AL_reg(context) {
case 0x00: /* IOCTL - GET DEVICE INFORMATION */
RESET_CFLAG(context); /* operation was successful */
SET_DX( context, 0x4080 ); /* bit 14 (support ioctl read) and
* bit 7 (is_device) */
break;
case 0x02: /* EMS - GET MEMORY MANAGER INFORMATION */
/*
* This is what is called "Windows Global EMM Import Specification".
* Undocumented of course! Supports three requests:
* GET API ENTRY POINT
* GET EMM IMPORT STRUCTURE ADDRESS
* GET MEMORY MANAGER VERSION
*/
INT_BARF(context,0x21);
break;
case 0x07: /* IOCTL - GET OUTPUT STATUS */
RESET_CFLAG(context); /* operation was successful */
SET_AL( context, 0xff ); /* device is ready */
break;
default:
INT_BARF(context,0x21);
break;
}
}
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