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change callback code; get rid of several calls to DOSBOX_RunMachine()

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2677
This commit is contained in:
Sebastian Strohhäcker 2006-07-24 19:06:55 +00:00
parent fcd1a96808
commit 6215071ebc
8 changed files with 527 additions and 328 deletions
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45
src/ints/xms.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: xms.cpp,v 1.42 2006-05-07 20:00:05 qbix79 Exp $ */
/* $Id: xms.cpp,v 1.43 2006-07-24 19:06:55 c2woody Exp $ */
#include <stdlib.h>
#include <string.h>
@ -64,6 +64,11 @@
#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
@ -123,9 +128,7 @@ Bitu XMS_QueryFreeMemory(Bit16u& largestFree, Bit16u& totalFree) {
return 0;
};
Bitu XMS_AllocateMemory(Bitu size, Bit16u& handle)
// size = kb
{
Bitu XMS_AllocateMemory(Bitu size, Bit16u& handle) { // size = kb
/* Find free handle */
Bit16u index=1;
while (!xms_handles[index].free) {
@ -142,8 +145,7 @@ Bitu XMS_AllocateMemory(Bitu size, Bit16u& handle)
return 0;
};
Bitu XMS_FreeMemory(Bitu handle)
{
Bitu XMS_FreeMemory(Bitu handle) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
MEM_ReleasePages(xms_handles[handle].mem);
xms_handles[handle].mem=-1;
@ -166,13 +168,13 @@ Bitu XMS_MoveMemory(PhysPt bpt) {
PhysPt srcpt,destpt;
if (src_handle) {
if (InvalidHandle(src_handle)) {
return 0xa3; /* Src Handle invalid */
return XMS_INVALID_SOURCE_HANDLE;
}
if (src.offset>=(xms_handles[src_handle].size*1024U)) {
return 0xa4; /* Src Offset invalid */
return XMS_INVALID_SOURCE_OFFSET;
}
if (length>xms_handles[src_handle].size*1024U-src.offset) {
return 0xa7; /* Length invalid */
return XMS_INVALID_LENGTH;
}
srcpt=(xms_handles[src_handle].mem*4096)+src.offset;
} else {
@ -180,13 +182,13 @@ Bitu XMS_MoveMemory(PhysPt bpt) {
}
if (dest_handle) {
if (InvalidHandle(dest_handle)) {
return 0xa5; /* Dest Handle invalid */
return XMS_INVALID_DEST_HANDLE;
}
if (dest.offset>=(xms_handles[dest_handle].size*1024U)) {
return 0xa6; /* Dest Offset invalid */
return XMS_INVALID_DEST_OFFSET;
}
if (length>xms_handles[dest_handle].size*1024U-dest.offset) {
return 0xa7; /* Length invalid */
return XMS_INVALID_LENGTH;
}
destpt=(xms_handles[dest_handle].mem*4096)+dest.offset;
} else {
@ -197,16 +199,14 @@ Bitu XMS_MoveMemory(PhysPt bpt) {
return 0;
}
Bitu XMS_LockMemory(Bitu handle, Bit32u& address)
{
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)
{
Bitu XMS_UnlockMemory(Bitu handle) {
if (InvalidHandle(handle)) return XMS_INVALID_HANDLE;
if (xms_handles[handle].locked) {
xms_handles[handle].locked--;
@ -215,8 +215,7 @@ Bitu XMS_UnlockMemory(Bitu handle)
return XMS_BLOCK_NOT_LOCKED;
};
Bitu XMS_GetHandleInformation(Bitu handle, Bit8u& lockCount, Bit8u& numFree, Bit16u& size)
{
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 */
@ -228,8 +227,7 @@ Bitu XMS_GetHandleInformation(Bitu handle, Bit8u& lockCount, Bit8u& numFree, Bit
return 0;
};
Bitu XMS_ResizeMemory(Bitu handle, Bitu newSize)
{
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;
@ -417,9 +415,16 @@ public:
Bitu i;
BIOS_ZeroExtendedSize(true);
DOS_AddMultiplexHandler(multiplex_xms);
/* place hookable callback in writable memory area */
xms_callback=RealMake(DOS_GetMemory(0x1),0);
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;