Switch interrupt function in Keil for ARM

/* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
    Function name: DisableInterruptFunction
   description: Disable interrupts
   Entry parameters: None
   Exit parameters: None
   Global variables: 
   Creation time:
   Modification time:
    Note: Disabling interrupts must be executed in interrupt mode, and SPSR can only be recognized in arm mode
*/     
// $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ The function declared in the above prototype is used by this function to call
void DisableInterrupt(void) __arm __swi(9)
{       
    //uint32 t;
       __asm
   ​​{                       
      MRS R0, SPSR
      ORR R0, R0, #0xc0
      MSR SPSR_c, R0           
   }
}




/* $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$
    Function name: EnableInterruptFunction
   description: Enable interrupt
   Entry parameters: None
   Exit parameters: None
   Global variables: 
   Creation time:
   Modification time:
    Note: Disabling interrupts must be executed in interrupt mode and SPSR can only be recognized in arm mode
*/     
// $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ The function declared in the above prototype is used by this function to call
void EnableInterrupt(void) __arm __swi(8)
{
    __asm
   ​​{                       
      MRS R0, SPSR
      BIC R0, R0, #0xc0
      MSR SPSR_c, R0           
   }          
}