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where __volatile is defined as volatile in sys/cdefs.h. I couldn't find the definition for __asm, but I assume it's the same as asm.

References

Extended Asm in the GCC manual describes how to use inline assembly in gcc. Unfortunately, it is not very precise or thorough.

Sandeep.S's GCC-Inline-Assembly-HOWTO is a nice introduction to writing inline assembly in gcc. Unfortunately, it does not mention the + (plus) constraint modifier, and it is wrong about the semantics of asm volatile (see Warning box above).