#include <dos.h>
//
//      Save FPU state.
//
//      This uses a magic spell taken from Intel application note AP-113.
//
void fpusave (char far* t)
{
    //_ES = FP_SEG (t);
    //_BX = FP_OFF (t);
    __asm les bx,t
    __asm  fnstcw  es:[bx]     // save IEM bit status
    __asm  nop                 // delay while control word saved
    __asm  fndisi              // disable BUSY signal
    __asm  mov     ax, es:[bx] // get original control word in AX
    __asm  fsave   es:[bx]     // save FPU state
    __asm  fwait               // wait for save to complete
    __asm  mov     es:[bx],ax  // put original control word in saved state
}

//
//      Restore FPU state.
//
void fpurest (char far* t)
{
    //_ES = FP_SEG (t);
    //_BX = FP_OFF (t);
    __asm les bx,t
    __asm frstor es:[bx]
}