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Added lock count and get EMB block information call.

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@201
This commit is contained in:
Sjoerd van der Berg 2002-08-21 22:23:10 +00:00
parent c1b9030aaa
commit 3650edab85
1 changed files with 17 additions and 0 deletions
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17
src/ints/xms.cpp
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@ -58,6 +58,7 @@ struct XMS_Block {
Bit16u prev,next;
Bit16u size; /* Size in kb's */
PhysPt phys;
Bit8u locked;
void * data;
bool active;
};
@ -155,8 +156,10 @@ foundnew:
xms_handles[new_index].next=xms_handles[index].next;
xms_handles[new_index].prev=index;
xms_handles[index].next=new_index;
xms_handles[index].locked=0;
xms_handles[new_index].active=true;
xms_handles[new_index].data=0;
xms_handles[new_index].locked=0;
xms_handles[new_index].size=xms_handles[index].size-reg_dx;
xms_handles[new_index].phys=xms_handles[index].phys+reg_dx*1024;
xms_handles[index].size=reg_dx;
@ -275,6 +278,7 @@ foundnew:
reg_bl=XMS_INVALID_HANDLE;
return CBRET_NONE;
}
if (xms_handles[reg_dx].locked<255) xms_handles[reg_dx].locked++;
reg_bx=(Bit16u)(xms_handles[reg_dx].phys & 0xFFFF);
reg_dx=(Bit16u)(xms_handles[reg_dx].phys>>16);
reg_ax=1;
@ -287,9 +291,21 @@ foundnew:
reg_bl=XMS_INVALID_HANDLE;
return CBRET_NONE;
}
if (xms_handles[reg_dx].locked) xms_handles[reg_dx].locked--;
reg_ax=1;reg_bl=0;
break;
case XMS_GET_EMB_HANDLE_INFORMATION: /* 0e */
/* Check for a valid handle */
if (!reg_dx || (reg_dx>=XMS_HANDLES) || !xms_handles[reg_dx].active || !xms_handles[reg_dx].data ) {
reg_ax=0;
reg_bl=XMS_INVALID_HANDLE;
return CBRET_NONE;
}
reg_bh=xms_handles[reg_dx].locked;
/* Find available blocks */
reg_bx=0;{ for (Bitu i=0;i<XMS_HANDLES;i++) if (!xms_handles[i].data) reg_bx++;}
reg_dx=xms_handles[reg_dx].size;
break;
case XMS_RESIZE_EXTENDED_MEMORY_BLOCK: /* 0f */
LOG_WARN("XMS:Unhandled call %2X",reg_ah);
break;
@ -321,6 +337,7 @@ void XMS_Init(void) {
xms_handles[i].next=0xffff;
xms_handles[i].prev=0xffff;
xms_handles[i].size=0;
xms_handles[i].locked=0;
}
/* Disable the 0 handle */
xms_handles[0].active=true;