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__disable_fiq intrinsic

Non-ConfidentialPDF file icon PDF versionARM DUI0375H
ARM® Compiler v5.06 for µVision® armcc User GuideVersion 5
Home > Compiler-specific Features > __disable_fiq intrinsic

9.108 __disable_fiq intrinsic

This intrinsic disables FIQ interrupts.

Note

Typically, this intrinsic disables FIQ interrupts by setting the F-bit in the CPSR. However, for v7-M it sets the fault mask register (FAULTMASK). FIQ interrupts are not supported in v6-M.

Syntax

int __disable_fiq(void)
void __disable_fiq(void)

Usage

int __disable_fiq(void); disables fast interrupts and returns the value the FIQ interrupt mask has in the PSR before disabling interrupts.
void __disable_fiq(void); disables fast interrupts.

Return value

int __disable_fiq(void); returns the value the FIQ interrupt mask has in the PSR before disabling FIQ interrupts.

Restrictions

int __disable_fiq(void); is not supported when compiling with --cpu=7. This is because of the difference between the generic ARMv7 architecture and the ARMv7 R and M-profiles in the exception handling model. This means that when you compile with --cpu=7, the compiler is unable to generate an instruction sequence that works on all ARMv7 processors and therefore int __disable_fiq(void); is not supported. You can use the void __disable_fiq(void); function prototype with --cpu=7.
The __disable_fiq intrinsic can only be executed in privileged modes, that is, in non-user modes. In User mode this intrinsic does not change the interrupt flags in the CPSR.

Example

void foo(void)
{
    int was_masked = __disable_fiq();
    /* ... */
    if (!was_masked)
        __enable_fiq();
}
Related reference
Non-ConfidentialPDF file icon PDF versionARM DUI0375H
Copyright © 2007, 2008, 2011, 2012, 2014-2016 ARM. All rights reserved. 
Home > Compiler-specific Features > __disable_fiq intrinsic

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