Resize Linear Memory Block

Changes the size of a memory block that was previously
allocated with the Allocate Linear Memory Block function
(Int 31H Fn 0504H).

Call With:

   AX     = 0505H
   ESI    = memory block handle
   ECX    = new block size (bytes, must be nonzero)
   EDX    = flags
           Bit    Significance
           0      0 = create uncommitted pages
                  1 = create committed pages
           1      0 = do not update segment descriptors
                  1 = segment descriptor update required
           2-31   reserved, must be zero

   and, if bit 1 of EDX is set (1):
   ES:EBX = selector:offset of a buffer containing an array
           of selectors, 1 word (16 bits) per selector
   EDI    = count of selectors in array

Returns:

   if function successful
   Carry flag= clear
   EBX    = new linear base address of memory block
   ESI    = new handle for memory block

   if function unsuccessful
   Carry flag= set
   AX     = error code
           8001H   unsupported function (16-bit host)
           8012H   linear memory unavailable
           8013H   physical memory unavailable
           8014H   backing store unavailable
           8016H   handle unavailable
           8021H   invalid value (ECX=0)
           8023H   invalid handle (in ESI)

Notes:

o  A DPMI 1.0 host that is 16-bit only will not support this
   function.
o  A 16-bit client of a 32-bit DPMI 1.0 host can use this
function.
o  After this function returns, the previous handle for the
   memory block is invalid and should not be used.
o  If this function fails, the block's size and base address
   are always unmodified.
o  If the size of the block is increased, the new pages are
   committed or uncommitted according to the value of bit 0
   of EDX, and the block's linear base address may change.
   If the size of the block is decreased, pages at the end
   of the block are freed, and the block's base address is
   always unchanged.
o  If the block's linear base address is changed by this
   function, and the function was called with bit 1 of EDX
   set (1), the DPMI host updates the descriptors f
or each of the segments in the update list which fall within the
   memory block.  Descriptors for segments which do not fall
   within the memory block are not modified.  Expand-up
   segments fall within the memory block if the segment base
   is within the block.   Expand-down segments fall within
   the memory block if the (segment base + the limit - 1) is
   within the block.  In either case, the segment base is
   modified by the distance the block moves, and the segment
   limit is not changed. The moving of the memory block and
   the updating of descriptors is performed atomically; i.e.
   the host will not deliver any hardware interrupts to the
   client during the update.
o  Int 31H Fn 0503H, which also resizes linear memory
   blocks, does not necessarily page-align blocks and cannot
   create uncommitted pages or update descriptors.