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b4f2a13f7f
dosbox-wii/src/ints/xms.cpp
retro100 b4f2a13f7f Sync to DOSBox SVN r4301
2021-02-06 16:06:31 +01:00

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/*
* Copyright (C) 2002-2019 The DOSBox Team
*
* 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.
*/
#include <stdlib.h>
#include <string.h>
#include <stddef.h>
#include "dosbox.h"
#include "callback.h"
#include "mem.h"
#include "regs.h"
#include "dos_inc.h"
#include "setup.h"
#include "inout.h"
#include "xms.h"
#include "bios.h"
#define XMS_HANDLES 50 /* 50 XMS Memory Blocks */
#define XMS_VERSION 0x0300 /* version 3.00 */
#define XMS_DRIVER_VERSION 0x0301 /* my driver version 3.01 */
#define XMS_GET_VERSION 0x00
#define XMS_ALLOCATE_HIGH_MEMORY 0x01
#define XMS_FREE_HIGH_MEMORY 0x02
#define XMS_GLOBAL_ENABLE_A20 0x03
#define XMS_GLOBAL_DISABLE_A20 0x04
#define XMS_LOCAL_ENABLE_A20 0x05
#define XMS_LOCAL_DISABLE_A20 0x06
#define XMS_QUERY_A20 0x07
#define XMS_QUERY_FREE_EXTENDED_MEMORY 0x08
#define XMS_ALLOCATE_EXTENDED_MEMORY 0x09
#define XMS_FREE_EXTENDED_MEMORY 0x0a
#define XMS_MOVE_EXTENDED_MEMORY_BLOCK 0x0b
#define XMS_LOCK_EXTENDED_MEMORY_BLOCK 0x0c
#define XMS_UNLOCK_EXTENDED_MEMORY_BLOCK 0x0d
#define XMS_GET_EMB_HANDLE_INFORMATION 0x0e
#define XMS_RESIZE_EXTENDED_MEMORY_BLOCK 0x0f
#define XMS_ALLOCATE_UMB 0x10
#define XMS_DEALLOCATE_UMB 0x11
#define XMS_QUERY_ANY_FREE_MEMORY 0x88
#define XMS_ALLOCATE_ANY_MEMORY 0x89
#define XMS_GET_EMB_HANDLE_INFORMATION_EXT 0x8e
#define XMS_RESIZE_ANY_EXTENDED_MEMORY_BLOCK 0x8f
#define XMS_FUNCTION_NOT_IMPLEMENTED 0x80
#define HIGH_MEMORY_NOT_EXIST 0x90
#define HIGH_MEMORY_IN_USE 0x91
#define HIGH_MEMORY_NOT_ALLOCATED 0x93
#define XMS_OUT_OF_SPACE 0xa0
#define XMS_OUT_OF_HANDLES 0xa1
#define XMS_INVALID_HANDLE 0xa2
#define XMS_INVALID_SOURCE_HANDLE 0xa3
#define XMS_INVALID_SOURCE_OFFSET 0xa4
#define XMS_INVALID_DEST_HANDLE 0xa5
#define XMS_INVALID_DEST_OFFSET 0xa6
#define XMS_INVALID_LENGTH 0xa7
#define XMS_BLOCK_NOT_LOCKED 0xaa
#define XMS_BLOCK_LOCKED 0xab
#define UMB_ONLY_SMALLER_BLOCK 0xb0
#define UMB_NO_BLOCKS_AVAILABLE 0xb1
struct XMS_Block {
Bitu size;
MemHandle mem;
Bit8u locked;
bool free;
};
#ifdef _MSC_VER
#pragma pack (1)
#endif
struct XMS_MemMove{
Bit32u length;
Bit16u src_handle;
union {
RealPt realpt;
Bit32u offset;
} src;
Bit16u dest_handle;
union {
RealPt realpt;
Bit32u offset;
} dest;
} GCC_ATTRIBUTE(packed);
#ifdef _MSC_VER
#pragma pack ()
#endif
Bitu XMS_EnableA20(bool enable) {
Bit8u val = IO_Read (0x92);
if (enable) IO_Write(0x92,val | 2);
else IO_Write(0x92,val & ~2);
return 0;
}
Bitu XMS_GetEnabledA20(void) {
return (IO_Read(0x92)&2)>0;
}
static RealPt xms_callback;
static bool umb_available;
static XMS_Block xms_handles[XMS_HANDLES];
static INLINE bool InvalidHandle(Bitu handle) {
return (!handle || (handle>=XMS_HANDLES) || xms_handles[handle].free);
}
Bitu XMS_QueryFreeMemory(Bit16u& largestFree, Bit16u& totalFree) {
/* Scan the tree for free memory and find largest free block */
totalFree=(Bit16u)(MEM_FreeTotal()*4);
largestFree=(Bit16u)(MEM_FreeLargest()*4);
if (!totalFree) return XMS_OUT_OF_SPACE;
return 0;
}
Bitu XMS_AllocateMemory(Bitu size, Bit16u& handle) { // size = kb
/* Find free handle */
Bit16u index=1;
while (!xms_handles[index].free) {
if (++index>=XMS_HANDLES) return XMS_OUT_OF_HANDLES;
}
MemHandle mem;
if (size!=0) {
Bitu pages=(size/4) + ((size & 3) ? 1 : 0);
mem=MEM_AllocatePages(pages,true);
if (!mem) return XMS_OUT_OF_SPACE;
} else {
mem=MEM_GetNextFreePage();
if (mem==0) LOG(LOG_MISC,LOG_ERROR)("XMS:Allocate zero pages with no memory left");
}
xms_handles[index].free=false;
xms_handles[index].mem=mem;
xms_handles[index].locked=0;
xms_handles[index].size=size;
handle=index;
return 0;
}
Bitu XMS_FreeMemory(Bitu handle) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
MEM_ReleasePages(xms_handles[handle].mem);
xms_handles[handle].mem=-1;
xms_handles[handle].size=0;
xms_handles[handle].free=true;
return 0;
}
Bitu XMS_MoveMemory(PhysPt bpt) {
/* Read the block with mem_read's */
Bitu length=mem_readd(bpt+offsetof(XMS_MemMove,length));
Bitu src_handle=mem_readw(bpt+offsetof(XMS_MemMove,src_handle));
union {
RealPt realpt;
Bit32u offset;
} src,dest;
src.offset=mem_readd(bpt+offsetof(XMS_MemMove,src.offset));
Bitu dest_handle=mem_readw(bpt+offsetof(XMS_MemMove,dest_handle));
dest.offset=mem_readd(bpt+offsetof(XMS_MemMove,dest.offset));
PhysPt srcpt,destpt;
if (src_handle) {
if (InvalidHandle(src_handle)) {
return XMS_INVALID_SOURCE_HANDLE;
}
if (src.offset>=(xms_handles[src_handle].size*1024U)) {
return XMS_INVALID_SOURCE_OFFSET;
}
if (length>xms_handles[src_handle].size*1024U-src.offset) {
return XMS_INVALID_LENGTH;
}
srcpt=(xms_handles[src_handle].mem*4096)+src.offset;
} else {
srcpt=Real2Phys(src.realpt);
}
if (dest_handle) {
if (InvalidHandle(dest_handle)) {
return XMS_INVALID_DEST_HANDLE;
}
if (dest.offset>=(xms_handles[dest_handle].size*1024U)) {
return XMS_INVALID_DEST_OFFSET;
}
if (length>xms_handles[dest_handle].size*1024U-dest.offset) {
return XMS_INVALID_LENGTH;
}
destpt=(xms_handles[dest_handle].mem*4096)+dest.offset;
} else {
destpt=Real2Phys(dest.realpt);
}
// LOG_MSG("XMS move src %X dest %X length %X",srcpt,destpt,length);
mem_memcpy(destpt,srcpt,length);
return 0;
}
Bitu XMS_LockMemory(Bitu handle, Bit32u& address) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
if (xms_handles[handle].locked<255) xms_handles[handle].locked++;
address = xms_handles[handle].mem*4096;
return 0;
}
Bitu XMS_UnlockMemory(Bitu handle) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
if (xms_handles[handle].locked) {
xms_handles[handle].locked--;
return 0;
}
return XMS_BLOCK_NOT_LOCKED;
}
Bitu XMS_GetHandleInformation(Bitu handle, Bit8u& lockCount, Bit8u& numFree, Bit16u& size) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
lockCount = xms_handles[handle].locked;
/* Find available blocks */
numFree=0;
for (Bitu i=1;i<XMS_HANDLES;i++) {
if (xms_handles[i].free) numFree++;
}
size=(Bit16u)(xms_handles[handle].size);
return 0;
}
Bitu XMS_ResizeMemory(Bitu handle, Bitu newSize) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
// Block has to be unlocked
if (xms_handles[handle].locked>0) return XMS_BLOCK_LOCKED;
Bitu pages=newSize/4 + ((newSize & 3) ? 1 : 0);
if (MEM_ReAllocatePages(xms_handles[handle].mem,pages,true)) {
xms_handles[handle].size = newSize;
return 0;
} else return XMS_OUT_OF_SPACE;
}
static bool multiplex_xms(void) {
switch (reg_ax) {
case 0x4300: /* XMS installed check */
reg_al=0x80;
return true;
case 0x4310: /* XMS handler seg:offset */
SegSet16(es,RealSeg(xms_callback));
reg_bx=RealOff(xms_callback);
return true;
}
return false;
}
INLINE void SET_RESULT(Bitu res,bool touch_bl_on_succes=true) {
if(touch_bl_on_succes || res) reg_bl = (Bit8u)res;
reg_ax = (res==0);
}
Bitu XMS_Handler(void) {
// LOG(LOG_MISC,LOG_ERROR)("XMS: CALL %02X",reg_ah);
switch (reg_ah) {
case XMS_GET_VERSION: /* 00 */
reg_ax=XMS_VERSION;
reg_bx=XMS_DRIVER_VERSION;
reg_dx=0; /* No we don't have HMA */
break;
case XMS_ALLOCATE_HIGH_MEMORY: /* 01 */
reg_ax=0;
reg_bl=HIGH_MEMORY_NOT_EXIST;
break;
case XMS_FREE_HIGH_MEMORY: /* 02 */
reg_ax=0;
reg_bl=HIGH_MEMORY_NOT_EXIST;
break;
case XMS_GLOBAL_ENABLE_A20: /* 03 */
case XMS_LOCAL_ENABLE_A20: /* 05 */
SET_RESULT(XMS_EnableA20(true));
break;
case XMS_GLOBAL_DISABLE_A20: /* 04 */
case XMS_LOCAL_DISABLE_A20: /* 06 */
SET_RESULT(XMS_EnableA20(false));
break;
case XMS_QUERY_A20: /* 07 */
reg_ax = XMS_GetEnabledA20();
reg_bl = 0;
break;
case XMS_QUERY_FREE_EXTENDED_MEMORY: /* 08 */
reg_bl = XMS_QueryFreeMemory(reg_ax,reg_dx);
break;
case XMS_ALLOCATE_ANY_MEMORY: /* 89 */
reg_edx &= 0xffff;
// fall through
case XMS_ALLOCATE_EXTENDED_MEMORY: /* 09 */
{
Bit16u handle = 0;
SET_RESULT(XMS_AllocateMemory(reg_dx,handle));
reg_dx = handle;
}; break;
case XMS_FREE_EXTENDED_MEMORY: /* 0a */
SET_RESULT(XMS_FreeMemory(reg_dx));
break;
case XMS_MOVE_EXTENDED_MEMORY_BLOCK: /* 0b */
SET_RESULT(XMS_MoveMemory(SegPhys(ds)+reg_si),false);
break;
case XMS_LOCK_EXTENDED_MEMORY_BLOCK: { /* 0c */
Bit32u address;
Bitu res = XMS_LockMemory(reg_dx, address);
if(res) reg_bl = (Bit8u)res;
reg_ax = (res==0);
if (res==0) { // success
reg_bx=(Bit16u)(address & 0xFFFF);
reg_dx=(Bit16u)(address >> 16);
};
}; break;
case XMS_UNLOCK_EXTENDED_MEMORY_BLOCK: /* 0d */
SET_RESULT(XMS_UnlockMemory(reg_dx));
break;
case XMS_GET_EMB_HANDLE_INFORMATION: /* 0e */
SET_RESULT(XMS_GetHandleInformation(reg_dx,reg_bh,reg_bl,reg_dx),false);
break;
case XMS_RESIZE_ANY_EXTENDED_MEMORY_BLOCK: /* 0x8f */
if(reg_ebx > reg_bx) LOG_MSG("64MB memory limit!");
//fall through
case XMS_RESIZE_EXTENDED_MEMORY_BLOCK: /* 0f */
SET_RESULT(XMS_ResizeMemory(reg_dx, reg_bx));
break;
case XMS_ALLOCATE_UMB: { /* 10 */
if (!umb_available) {
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
break;
}
Bit16u umb_start=dos_infoblock.GetStartOfUMBChain();
if (umb_start==0xffff) {
reg_ax=0;
reg_bl=UMB_NO_BLOCKS_AVAILABLE;
reg_dx=0; // no upper memory available
break;
}
/* Save status and linkage of upper UMB chain and link upper
memory to the regular MCB chain */
Bit8u umb_flag=dos_infoblock.GetUMBChainState();
if ((umb_flag&1)==0) DOS_LinkUMBsToMemChain(1);
Bit8u old_memstrat=DOS_GetMemAllocStrategy()&0xff;
DOS_SetMemAllocStrategy(0x40); // search in UMBs only
Bit16u size=reg_dx;Bit16u seg;
if (DOS_AllocateMemory(&seg,&size)) {
reg_ax=1;
reg_bx=seg;
} else {
reg_ax=0;
if (size==0) reg_bl=UMB_NO_BLOCKS_AVAILABLE;
else reg_bl=UMB_ONLY_SMALLER_BLOCK;
reg_dx=size; // size of largest available UMB
}
/* Restore status and linkage of upper UMB chain */
Bit8u current_umb_flag=dos_infoblock.GetUMBChainState();
if ((current_umb_flag&1)!=(umb_flag&1)) DOS_LinkUMBsToMemChain(umb_flag);
DOS_SetMemAllocStrategy(old_memstrat);
}
break;
case XMS_DEALLOCATE_UMB: /* 11 */
if (!umb_available) {
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
break;
}
if (dos_infoblock.GetStartOfUMBChain()!=0xffff) {
if (DOS_FreeMemory(reg_dx)) {
reg_ax=0x0001;
break;
}
}
reg_ax=0x0000;
reg_bl=UMB_NO_BLOCKS_AVAILABLE;
break;
case XMS_QUERY_ANY_FREE_MEMORY: /* 88 */
reg_bl = XMS_QueryFreeMemory(reg_ax,reg_dx);
reg_eax &= 0xffff;
reg_edx &= 0xffff;
reg_ecx = (MEM_TotalPages()*MEM_PAGESIZE)-1; // highest known physical memory address
break;
case XMS_GET_EMB_HANDLE_INFORMATION_EXT: { /* 8e */
Bit8u free_handles;
Bitu result = XMS_GetHandleInformation(reg_dx,reg_bh,free_handles,reg_dx);
if (result != 0) reg_bl = result;
else {
reg_edx &= 0xffff;
reg_cx = free_handles;
}
reg_ax = (result==0);
} break;
default:
LOG(LOG_MISC,LOG_ERROR)("XMS: unknown function %02X",reg_ah);
reg_ax=0;
reg_bl=XMS_FUNCTION_NOT_IMPLEMENTED;
}
// LOG(LOG_MISC,LOG_ERROR)("XMS: CALL Result: %02X",reg_bl);
return CBRET_NONE;
}
Bitu GetEMSType(Section_prop * section);
class XMS: public Module_base {
private:
CALLBACK_HandlerObject callbackhandler;
public:
XMS(Section* configuration):Module_base(configuration){
Section_prop * section=static_cast<Section_prop *>(configuration);
umb_available=false;
if (!section->Get_bool("xms")) return;
Bitu i;
BIOS_ZeroExtendedSize(true);
DOS_AddMultiplexHandler(multiplex_xms);
/* place hookable callback in writable memory area */
xms_callback=RealMake(DOS_GetMemory(0x1)-1,0x10);
callbackhandler.Install(&XMS_Handler,CB_HOOKABLE,Real2Phys(xms_callback),"XMS Handler");
// pseudocode for CB_HOOKABLE:
// jump near skip
// nop,nop,nop
// label skip:
// callback XMS_Handler
// retf
for (i=0;i<XMS_HANDLES;i++) {
xms_handles[i].free=true;
xms_handles[i].mem=-1;
xms_handles[i].size=0;
xms_handles[i].locked=0;
}
/* Disable the 0 handle */
xms_handles[0].free = false;
/* Set up UMB chain */
umb_available=section->Get_bool("umb");
bool ems_available = GetEMSType(section)>0;
DOS_BuildUMBChain(section->Get_bool("umb"),ems_available);
}
~XMS(){
Section_prop * section = static_cast<Section_prop *>(m_configuration);
/* Remove upper memory information */
dos_infoblock.SetStartOfUMBChain(0xffff);
if (umb_available) {
dos_infoblock.SetUMBChainState(0);
umb_available=false;
}
if (!section->Get_bool("xms")) return;
/* Undo biosclearing */
BIOS_ZeroExtendedSize(false);
/* Remove Multiplex */
DOS_DelMultiplexHandler(multiplex_xms);
/* Free used memory while skipping the 0 handle */
for (Bitu i = 1;i<XMS_HANDLES;i++)
if(!xms_handles[i].free) XMS_FreeMemory(i);
}
};
static XMS* test;
void XMS_ShutDown(Section* /*sec*/) {
delete test;
}
void XMS_Init(Section* sec) {
test = new XMS(sec);
sec->AddDestroyFunction(&XMS_ShutDown,true);
}
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