# OS_DisableInterrupts_IrqAndFiq

## Syntax

  `#include <nitro/os.h>`
  `OSIntrMode OS_DisableInterrupts_IrqAndFiq( void );`

## Arguments

None.

## Return Values

Returns a value that indicates the state before this function was called.

The return value type is `OSIntrMode` (a `u32` typedef), but the return value is the logical sum of the `OSIntrMode_Irq` and `OSIntrMode_Fiq` enumerated types.
The `OSIntrMode_Irq` enumerated type:

Value | Previous state
--- | ---
OS_INTRMODE_IRQ_DISABLE | IRQ Disable (prohibited)
OS_INTRMODE_IRQ_ENABLE | IRQ Enable (permitted)

The `OSIntrMode_Fiq` enumerated type:

Value | Previous state
--- | ---
OS_INTRMODE_FIQ_DISABLE | FIQ Disable (prohibited)
OS_INTRMODE_FIQ_ENABLE | FIQ Enable (permitted)

## Description

This function disables IRQ and FIQ interrupts.

The master enable flag for all interrupts (the Interrupt Master Enable Flag) is what is disabled here. If IRQs are disabled with this function, no interrupts will occur even if IRQ interrupt causes are individually set to enable.

The return value indicates the state prior to calling the function.

## Internal Operation

The CPSR register (current program status register) IRQ and FIQ interrupt control bit are set (the set is disabled).

## See Also

`OS_EnableInterrupts_IrqAndFiq
OS_RestoreInterrupts_IrqAndFiq
OS_DisableInterrupts
`

## Revision History

2005/03/08 Standardized the Japanese word for "interrupt".
2004/03/04 Moved from `OS_DisableInterrupts`.

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