OpenEuphoria

2. Re: Free XMS

• Posted by Jacques Deschenes <desja at GLOBETROTTER.QC.CA> Aug 13, 1997
• 830 views
• Last edited Aug 14, 1997

At 20:37 13-08-97 -0400, you wrote:
>Hello all,
>
>I need a function to detect the amount of free xms memory during a program.
>I know how to detect if XMS driver is loaded and to get the driver Entry
>Point using interrupt 2Fh, however I do not know how to do a assembly
>function in Euphoria. The assembly looks something
>like this
>
>xmaadress is the 32 bit address of the entry point.
>dx stores the amount of free xms in K
>
>pushad
>mov ah, 08h
>call [xmaadress]
>mov [freemem], dx
>popad
>ret
>
>I need to be able to return the freemem value.
>
>Thanks for the help in advance,
>
>Greg Harris
>
>

from inside an euphoria program it's better to use DPMI services to get
information
about available memory. The following code is the demo for that.


-----------------  clip here -------------------------------
--  demo: getting information about available memory.
--
--  organisation of data_struct filled by DPMI service #500
--
--                       Offset           Description
--
--                        00h    Largest available free block in
--                               bytes
--
--                        04h    Maximum unlocked page allocation
--
--                        08h    Maximum locked page allocation
--
--                        0Ch    Linear addr space size in pages
--
--                        10h    Total number of unlocked pages
--
--                        14h    Number of free pages
--
--                        18h    Total number of physical pages
--
--                        1Ch    Free linear address space in pages
--
--                        20h    Size of paging file/partition in
--                               pages

include machine.e

atom data_struct
data_struct = allocate(#30)
if not data_struct then
        abort(1)
end if
mem_set(data_struct,0,#30)

constant sFree_mem = {
  #60,                              --   pushad
  #06,                              --   push es
  #1E,                              --   push ds
  #07,                              --   pop  es
  #BF}&int_to_bytes(data_struct)&{  --   mov edi, data_struct
  #B8,0,5,0,0,                      --   mov eax, #500
  #CD,#31,                          --   int #31
  #07,                              --   pop es
  #61,                              --   popad
  #C3                               --   ret
}
atom cFree_mem
cFree_mem = allocate(length(sFree_mem))
if not cFree_mem then
        free(data_struct)
        abort(1)
end if
poke(cFree_mem,sFree_mem)
call(cFree_mem)

atom free_block, max_unlocked, page_size, total_free, max_locked,
         total_virtual, total_number_unlocked, total_physical,
         free_linear, paging_file

  free_block = bytes_to_int(peek({data_struct,4}))
  max_unlocked = bytes_to_int(peek({data_struct+4,4}))
  page_size = free_block/max_unlocked
  max_locked = bytes_to_int(peek({data_struct+8,4}))
  total_virtual = bytes_to_int(peek({data_struct+#C,4}))*page_size
  total_number_unlocked = bytes_to_int(peek({data_struct+#10,4}))
  total_free = bytes_to_int(peek({data_struct+#14,4}))
  total_physical = bytes_to_int(peek({data_struct+#18,4}))
  free_linear = bytes_to_int(peek({data_struct+#1C,4}))
  paging_file = bytes_to_int(peek({data_struct+#20,4}))

printf(1,"00h Largest available free block = %10d bytes\n",
                 {free_block})
printf(1,"04h Maximum unlocked pages allocation = %5d pages\n",
                  {max_unlocked})
printf(1,"08h Maximum locked pages allocation = %5d pages\n",{max_locked})
printf(1,"0Ch total virtual memory = %10d\n",{total_virtual})
printf(1,"10h Total number of unlocked pages = %5d\n",{total_number_unlocked})
printf(1,"14h Number of free pages = %d\n",{total_free})
printf(1,"18h Total number of physical pages= %5d (%10d bytes)\n",
                  {total_physical,total_physical*page_size})
printf(1,"1Ch free linear address space = %5d pages\n",{free_linear})
printf(1,"20h size of paging file = %10d pages\n",{paging_file})

free(cFree_mem)
free(data_struct)

------   clip here --------------------------------------


Jacques Deschenes
Baie-Comeau, Quebec
Canada
desja at globetrotter.qc.ca