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include vmm.inc
 
VMMcall _GetDescriptor, <Selector, VM, flags>
 
mov     ecx, eax                ; zero in eax and edx if error
or      ecx, edx
jz      error
 
mov     [DescDWORD1], edx       ; high doubleword of descriptor
mov     [DescDWORD2], eax       ; low doubleword of descriptor
 
The _GetDescriptor service retrieves a copy of the descriptor associated
with the given LDT or GDT selector.
 
Parameter  Description
────────────────────────────────────────────────────────────────────────────
 
Selector   Specifies a GDT or LDT selector.
 
VM         Specifies a handle identifying the virtual machine to which the
           specified LDT selector belongs. The service ignores this
           parameter if Selector is a GDT selector. Otherwise, the handle
           must be valid for LDT selectors.
 
flags      Specifies the operation flags. This parameter must be set to 0.
 
Return Value
 
The EAX register contains the low doubleword of the descriptor and the EDX
register contain the high doubleword of the descriptor. Both EAX and EDX
contain zero to indicate an error, such as an invalid selector or an invalid
virtual machine handle.
 
Comments
 
This service ignores the high 16-bits of the Selector parameter; the 80386
CPU often sets these bits to random values when doubleword operations are
performed on segment registers.
 
This service ignores the RPL bits of the selector.
 
Uses
 
EAX, EDX
 
See Also
 
_BuildDescriptorDWORDs, _SetDescriptor
 
 
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