91 // This will return 1 if it was iDFC interrupted (0 otherwise).

    92 // As there is no Kernel interface for that, we have to 'fake' Kernel by

    93 // setting SVC mode before calling NKern::CurrentContext.

    94 // Without that, CurrentContext would always return EInterrupt.

    95 __NAKED__ TUint IDFCRunning()

    96     {

    97     asm("stmfd sp!, {r4-r5} "); 

    98 

    99     asm("mrs r5, cpsr");                            // r5 = cpsr_irq

   100     asm("bic r4, r5, #0xdf ");                      // clear interrupt mask & CPU mode

   101     asm("orr r4, r4, #0xd3 ");                      // disable all interrupts and set SVC mode

   102 

   103     asm("msr CPSR_cf, r4");                         // switch to SVC, (dissable FIQ, IRQ)

   104 

   105     // NKern::CurrentContext does not use sp (only r0,r1,r2)

   106     // It is just lr in svc mode we need to preserve.

   107     asm("mov r4, lr");                              // r4 = lr_svc

   108     asm("bl " CSM__ZN5NKern14CurrentContextEv );    // r0 = 1 if iDFC was running, 0 if a thread was running

   109     asm("mov lr, r4");                              // lr_svc is back to original state

   110 

   111     asm("msr CPSR_cf, r5");                         // return to IRQ mode

   112 

   113     asm("ldmfd sp!, {r4-r5} ");

   114     __JUMP(,lr);

   115     }