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fixed bug in xms resize mem

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@943
This commit is contained in:
Ulf Wohlers 2003-04-19 11:59:22 +00:00
parent 619c351959
commit 74574ecc81
1 changed files with 25 additions and 24 deletions
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49
src/ints/xms.cpp
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@ -284,30 +284,28 @@ Bitu XMS_ResizeMemory(Bitu handle, Bitu newSize)
Bit16u sizeDelta = xms_handles[handle].size - newSize;
Bit16u next = xms_handles[handle].next;
if (next<XMS_HANDLES) {
if (xms_handles[next].active && !xms_handles[next].allocated) {
// add size / set phys
xms_handles[next].size += sizeDelta;
xms_handles[next].phys -= sizeDelta*1024;
} else {
// next block is in use, create a new lonely unused one :)
Bit16u newindex=1;
while (newindex<XMS_HANDLES) {
if (!xms_handles[newindex].active) break;
newindex++;
}
if (newindex>=XMS_HANDLES) return XMS_OUT_OF_HANDLES;
xms_handles[newindex].active = true;
xms_handles[newindex].allocated = false;
xms_handles[newindex].locked = 0;
xms_handles[newindex].prev = handle;
xms_handles[newindex].next = next;
xms_handles[newindex].phys = xms_handles[handle].phys+newSize*1024;
xms_handles[newindex].size = sizeDelta;
xms_handles[handle] .next = newindex;
xms_handles[next] .prev = newindex;
if ((next<XMS_HANDLES) && (xms_handles[next].active && !xms_handles[next].allocated)) {
// add size / set phys
xms_handles[next].size += sizeDelta;
xms_handles[next].phys -= sizeDelta*1024;
} else {
// next block is in use, create a new lonely unused one :)
Bit16u newindex=1;
while (newindex<XMS_HANDLES) {
if (!xms_handles[newindex].active) break;
newindex++;
}
if (newindex>=XMS_HANDLES) return XMS_OUT_OF_HANDLES;
xms_handles[newindex].active = true;
xms_handles[newindex].allocated = false;
xms_handles[newindex].locked = 0;
xms_handles[newindex].prev = handle;
xms_handles[newindex].next = next;
xms_handles[newindex].phys = xms_handles[handle].phys+newSize*1024;
xms_handles[newindex].size = sizeDelta;
xms_handles[handle] .next = newindex;
if (next<XMS_HANDLES) xms_handles[next].prev = newindex;
}
// Resize and allocate new mem
xms_handles[handle].size = newSize;
@ -362,6 +360,7 @@ static bool multiplex_xms(void) {
};
Bitu XMS_Handler(void) {
LOG(LOG_ERROR,"XMS: CALL %02X",reg_ah);
switch (reg_ah) {
case XMS_GET_VERSION: /* 00 */
@ -395,7 +394,8 @@ Bitu XMS_Handler(void) {
case XMS_QUERY_FREE_EXTENDED_MEMORY: /* 08 */
reg_bl = XMS_QueryFreeMemory(reg_ax,reg_dx);
break;
case XMS_ALLOCATE_EXTENDED_MEMORY: { /* 09 */
case XMS_ALLOCATE_EXTENDED_MEMORY: /* 09 */
{
Bit16u handle = 0;
reg_bl = XMS_AllocateMemory(reg_dx,handle);
reg_dx = handle;
@ -440,6 +440,7 @@ Bitu XMS_Handler(void) {
break;
}
LOG(LOG_ERROR,"XMS: CALL Result: %02X",reg_bl);
return CBRET_NONE;
}