/*
* if haven't started using the FPU the record that we're using it and init
* it. If already using it, then restore its state
*/
static void fpu_device_handler(int trapno, u_int eip)
{
u_short cpu = sys_get_cpu_id();
assert(cpu < 32);
cpulock_acquire();
/* clear the TS bit */
sys_clts();
if ((UAREA.u_fpu & (1<<cpu)) == 0)
{
asm volatile ("fninit\n");
UAREA.u_fpu |= (1<<cpu);
}
else
{
/* if haven't started using the FPU the record that we're using it and init
it. If already using it, then restore its state */
static void fpu_device_handler(int trapno, u_int eip) {
dlockputs(__UAREA_LD, "fpu_device_handler get lock ");
EXOS_LOCK(UAREA_LOCK);
dlockputs(__UAREA_LD, "... got lock\n");
EnterCritical();
/* clear the TS bit */
sys_clts();
if (UAREA.u_fpu == 0) {
asm("fninit\n");
UAREA.u_fpu = 1;
} else
asm("frstor __exos_fpus\n");
_exos_fpu_used_ctxt = 1;
EXOS_UNLOCK(UAREA_LOCK);
dlockputs(__UAREA_LD, "fpu_device_handler release lock\n");
ExitCritical();
}
