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https://github.com/reactos/wine.git
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356 lines
9.7 KiB
C
356 lines
9.7 KiB
C
/*
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* Int67 (EMS) emulation
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*/
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#include <assert.h>
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#include "wine/winbase16.h"
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#include "dosexe.h"
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#include "miscemu.h"
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#include "debugtools.h"
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DEFAULT_DEBUG_CHANNEL(int);
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/*
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* EMS page size == 16 kilobytes.
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*/
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#define EMS_PAGE_SIZE (16*1024)
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/*
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* Linear address of EMS page.
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*/
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#define EMS_PAGE_ADDRESS(base,page) (((char*)base) + EMS_PAGE_SIZE * page)
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/*
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* Maximum number of pages that can be allocated using EMS.
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*/
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#define EMS_MAX_PAGES 1024
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/*
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* Maximum number of EMS handles (allocated blocks).
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*/
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#define EMS_MAX_HANDLES 256
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/*
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* Global EMM Import Record.
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* Applications can get address of this record
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* and directly access allocated memory if they use
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* IOCTL interface.
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*
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* FIXME: Missing lots of fields, packing is not correct.
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*/
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struct {
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struct {
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UCHAR hindex; /* handle number */
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BYTE flags; /* bit 0: normal handle rather than system handle */
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char name[8]; /* handle name */
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WORD pages; /* allocated pages */
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void *address; /* physical address*/
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} handle[EMS_MAX_HANDLES];
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/* Wine specific fields... */
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int used_pages; /* Number of allocated pages. */
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void *frame_address; /* Address of 64k EMS page frame */
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WORD frame_selector; /* Segment of 64k EMS page frame */
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struct {
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UCHAR hindex; /* handle number */
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WORD logical_page; /* logical page */
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} mapping[4];
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} *EMS_record = 0;
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/**********************************************************************
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* EMS_init
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*
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* Allocates and initialized page frame and EMS global import record.
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*/
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static void EMS_init(void)
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{
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/*
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* FIXME: Should dynamically allocate upper memory block for EMS frame.
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*/
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ULONG base = 0xd0000;
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if(EMS_record)
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return;
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EMS_record = HeapAlloc(GetProcessHeap(),
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HEAP_ZERO_MEMORY,
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sizeof(*EMS_record));
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EMS_record->frame_address = DOSMEM_MapDosToLinear(base);
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EMS_record->frame_selector = base >> 4;
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}
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/**********************************************************************
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* EMS_alloc
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*
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* Get handle and allocate memory.
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*/
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static void EMS_alloc( CONTEXT86 *context )
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{
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int hindex = 1; /* handle zero is reserved for system */
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while(hindex < EMS_MAX_HANDLES && EMS_record->handle[hindex].address)
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hindex++;
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if(hindex == EMS_MAX_HANDLES) {
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AH_reg(context) = 0x85; /* status: no more handles available */
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} else {
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int pages = BX_reg(context);
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void *buffer = HeapAlloc( GetProcessHeap(), 0, pages * EMS_PAGE_SIZE );
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if(!buffer) {
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AH_reg(context) = 0x88; /* status: insufficient pages available */
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} else {
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EMS_record->handle[hindex].address = buffer;
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EMS_record->handle[hindex].pages = pages;
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EMS_record->used_pages += pages;
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DX_reg(context) = hindex; /* handle to allocated memory*/
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AH_reg(context) = 0; /* status: ok */
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}
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}
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}
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/**********************************************************************
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* EMS_access_name
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*
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* Get/set handle name.
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*/
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static void EMS_access_name( CONTEXT86 *context )
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{
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char *ptr;
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int hindex = DX_reg(context);
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if(hindex < 0 || hindex >= EMS_MAX_HANDLES) {
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AH_reg(context) = 0x83; /* invalid handle */
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return;
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}
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switch AL_reg(context) {
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case 0x00: /* get name */
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ptr = MapSL(MAKESEGPTR(context->SegEs, DI_reg(context)));
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memcpy(ptr, EMS_record->handle[hindex].name, 8);
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AH_reg(context) = 0;
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break;
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case 0x01: /* set name */
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ptr = MapSL(MAKESEGPTR(context->SegDs, SI_reg(context)));
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memcpy(EMS_record->handle[hindex].name, ptr, 8);
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AH_reg(context) = 0;
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break;
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default:
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INT_BARF(context,0x67);
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break;
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}
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}
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/**********************************************************************
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* EMS_map
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*
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* Map logical page into physical page.
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*/
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static void EMS_map( CONTEXT86 *context )
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{
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int physical_page = AL_reg(context);
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int new_hindex = DX_reg(context);
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int new_logical_page = BX_reg(context);
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int old_hindex = EMS_record->mapping[physical_page].hindex;
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int old_logical_page = EMS_record->mapping[physical_page].logical_page;
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void *physical_address = EMS_PAGE_ADDRESS(EMS_record->frame_address,
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physical_page);
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/* unmap old page */
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if(old_hindex) {
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void *ptr = EMS_PAGE_ADDRESS(EMS_record->handle[old_hindex].address,
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old_logical_page);
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memcpy(ptr, physical_address, EMS_PAGE_SIZE);
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}
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/* map new page */
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if(new_hindex && new_logical_page != 0xffff) {
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void *ptr = EMS_PAGE_ADDRESS(EMS_record->handle[new_hindex].address,
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new_logical_page);
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memcpy(physical_address, ptr, EMS_PAGE_SIZE);
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EMS_record->mapping[physical_page].hindex = new_hindex;
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EMS_record->mapping[physical_page].logical_page = new_logical_page;
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} else {
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EMS_record->mapping[physical_page].hindex = 0;
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EMS_record->mapping[physical_page].logical_page = 0;
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}
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AH_reg(context) = 0; /* status: ok */
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}
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/**********************************************************************
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* EMS_free
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*
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* Free memory and release handle.
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*/
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static void EMS_free( CONTEXT86 *context )
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{
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int hindex = DX_reg(context);
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int i;
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if(hindex < 0 || hindex >= EMS_MAX_HANDLES) {
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AH_reg(context) = 0x83; /* status: invalid handle */
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return;
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}
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if(!EMS_record->handle[hindex].address) {
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AH_reg(context) = 0; /* status: ok */
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return;
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}
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EMS_record->used_pages -= EMS_record->handle[hindex].pages;
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/* unmap pages */
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for(i=0; i<4; i++)
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if(EMS_record->mapping[i].hindex == hindex)
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EMS_record->mapping[i].hindex = 0;
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/* free block */
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HeapFree( GetProcessHeap(), 0, EMS_record->handle[hindex].address );
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EMS_record->handle[hindex].address = 0;
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AH_reg(context) = 0; /* status: ok */
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}
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/**********************************************************************
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* DOSVM_Int67Handler
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*
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* Handler for interrupt 67h EMS routines.
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*/
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void WINAPI DOSVM_Int67Handler( CONTEXT86 *context )
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{
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switch AH_reg(context) {
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case 0x40: /* EMS - GET MANAGER STATUS */
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AH_reg(context) = 0; /* status: ok */
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break;
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case 0x41: /* EMS - GET PAGE FRAME SEGMENT */
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EMS_init();
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BX_reg(context) = EMS_record->frame_selector; /* segment of page frame */
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AH_reg(context) = 0; /* status: ok */
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break;
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case 0x42: /* EMS - GET NUMBER OF PAGES */
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EMS_init();
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/* unallocated 16k pages */
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BX_reg(context) = EMS_MAX_PAGES - EMS_record->used_pages;
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/* total number of 16k pages */
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DX_reg(context) = EMS_MAX_PAGES;
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/* status: ok */
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AH_reg(context) = 0;
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break;
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case 0x43: /* EMS - GET HANDLE AND ALLOCATE MEMORY */
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EMS_init();
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EMS_alloc(context);
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break;
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case 0x44: /* EMS - MAP MEMORY */
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EMS_init();
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EMS_map(context);
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break;
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case 0x45: /* EMS - RELEASE HANDLE AND MEMORY */
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EMS_init();
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EMS_free(context);
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break;
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case 0x46: /* EMS - GET EMM VERSION */
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AL_reg(context) = 0x40; /* version 4.0 */
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AH_reg(context) = 0; /* status: ok */
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break;
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case 0x47: /* EMS - SAVE MAPPING CONTEXT */
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case 0x48: /* EMS - RESTORE MAPPING CONTEXT */
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INT_BARF(context,0x67);
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break;
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case 0x49: /* EMS - reserved - GET I/O PORT ADDRESSES */
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case 0x4a: /* EMS - reserved - GET TRANSLATION ARRAY */
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INT_BARF(context,0x67);
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break;
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case 0x4b: /* EMS - GET NUMBER OF EMM HANDLES */
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BX_reg(context) = EMS_MAX_HANDLES; /* EMM handles */
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AH_reg(context) = 0; /* status: ok */
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break;
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case 0x4c: /* EMS - GET PAGES OWNED BY HANDLE */
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case 0x4d: /* EMS - GET PAGES FOR ALL HANDLES */
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case 0x4e: /* EMS - GET OR SET PAGE MAP */
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case 0x4f: /* EMS 4.0 - GET/SET PARTIAL PAGE MAP */
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case 0x50: /* EMS 4.0 - MAP/UNMAP MULTIPLE HANDLE PAGES */
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case 0x51: /* EMS 4.0 - REALLOCATE PAGES */
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case 0x52: /* EMS 4.0 - GET/SET HANDLE ATTRIBUTES */
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INT_BARF(context,0x67);
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break;
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case 0x53: /* EMS 4.0 - GET/SET HANDLE NAME */
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EMS_init();
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EMS_access_name(context);
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break;
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case 0x54: /* EMS 4.0 - GET HANDLE DIRECTORY */
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case 0x55: /* EMS 4.0 - ALTER PAGE MAP AND JUMP */
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case 0x56: /* EMS 4.0 - ALTER PAGE MAP AND CALL */
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case 0x57: /* EMS 4.0 - MOVE/EXCHANGE MEMORY REGION */
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case 0x58: /* EMS 4.0 - GET MAPPABLE PHYSICAL ADDRESS ARRAY */
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case 0x59: /* EMS 4.0 - GET EXPANDED MEMORY HARDWARE INFORMATION */
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case 0x5a: /* EMS 4.0 - ALLOCATE STANDARD/RAW PAGES */
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case 0x5b: /* EMS 4.0 - ALTERNATE MAP REGISTER SET */
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case 0x5c: /* EMS 4.0 - PREPARE EXPANDED MEMORY HARDWARE FOR WARM BOOT */
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case 0x5d: /* EMS 4.0 - ENABLE/DISABLE OS FUNCTION SET FUNCTIONS */
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default:
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INT_BARF(context,0x67);
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}
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}
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/**********************************************************************
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* EMS_Ioctl_Handler
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*
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* Handler for interrupt 21h IOCTL routine for device "EMMXXXX0".
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*/
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void WINAPI EMS_Ioctl_Handler( CONTEXT86 *context )
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{
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assert(AH_reg(context) == 0x44);
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switch AL_reg(context) {
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case 0x00: /* IOCTL - GET DEVICE INFORMATION */
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RESET_CFLAG(context); /* operation was successful */
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DX_reg(context) = 0x4080; /* bit 14 (support ioctl read) and
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* bit 7 (is_device) */
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break;
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case 0x02: /* EMS - GET MEMORY MANAGER INFORMATION */
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/*
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* This is what is called "Windows Global EMM Import Specification".
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* Undocumented of course! Supports three requests:
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* GET API ENTRY POINT
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* GET EMM IMPORT STRUCTURE ADDRESS
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* GET MEMORY MANAGER VERSION
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*/
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INT_BARF(context,0x21);
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break;
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case 0x07: /* IOCTL - GET OUTPUT STATUS */
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RESET_CFLAG(context); /* operation was successful */
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AL_reg(context) = 0xff; /* device is ready */
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break;
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default:
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INT_BARF(context,0x21);
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break;
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}
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}
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