RealView Compilation Tools Compiler Reference Guide - ARM ...

Compiler-specific Features
}
if (!was_masked)
__enable_fiq();
See also
• __enable_fiq on page 4-73.
4.7.14 __disable_irq
This intrinsic disables IRQ interrupts.
Syntax
int __disable_irq(void)
Note
On ARMv7 and ARMv7-M, the __disable_irq intrinsic has prototype:
void __disable_irq(void)
Return value
__irq returns the value the IRQ interrupt mask has in the PSR prior to the disabling of
IRQ interrupts.
Example
void foo(void)
{
int was_masked = __disable_irq();
/* ... */
}
if (!was_masked)
__enable_irq();
Restrictions
The __disable_irq 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.
4-72 Copyright © 2007, 2010 ARM Limited. All rights reserved. ARM DUI 0348A
Non-Confidential