XMS: Add dosbox.conf option to control the number of XMS handles

joncampbell123 · Aug 15, 2018 · 88e7d00 · 88e7d00
1 parent a9ce8a6
commit 88e7d00
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diff --git a/src/dosbox.cpp b/src/dosbox.cpp
@@ -2378,6 +2378,9 @@ void DOSBOX_SetupConfigSections(void) {
     Pbool = secprop->Add_bool("xms",Property::Changeable::WhenIdle,true);
     Pbool->Set_help("Enable XMS support.");
 
+    Pint = secprop->Add_int("xms handles",Property::Changeable::WhenIdle,0);
+    Pint->Set_help("Number of XMS handles available for the DOS environment, or 0 to use a reasonable default");
+
     Pbool = secprop->Add_bool("hma",Property::Changeable::WhenIdle,true);
     Pbool->Set_help("Report through XMS that HMA exists (not necessarily available)");
 

diff --git a/src/ints/xms.cpp b/src/ints/xms.cpp
@@ -632,6 +632,16 @@ class XMS: public Module_base {
 
 		if (!section->Get_bool("xms")) return;
 
+        XMS_HANDLES = section->Get_int("xms handles");
+        if (XMS_HANDLES == 0)
+            XMS_HANDLES = XMS_HANDLES_DEFAULT;
+        else if (XMS_HANDLES < XMS_HANDLES_MIN)
+            XMS_HANDLES = XMS_HANDLES_MIN;
+        else if (XMS_HANDLES > XMS_HANDLES_MAX)
+            XMS_HANDLES = XMS_HANDLES_MAX;
+
+        LOG_MSG("XMS: %u handles allocated for use by the DOS environment",XMS_HANDLES);
+
 		/* NTS: Disable XMS emulation if CPU type is less than a 286, because extended memory did not
 		 *      exist until the CPU had enough address lines to read past the 1MB mark.
 		 *