ARM: Add a cmpxchg implementation to the "comm page". This implementation does what it's supposed to (I think), but it's not atomic and doesn't have memory barriers like the kernel's version.
ARM: Add a cmpxchg implementation to the "comm page".
This implementation does what it's supposed to (I think), but it's not atomic
and doesn't have memory barriers like the kernel's version.

haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,haowu4682/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5,LingxiaoJIA/gem5,haowu4682/gem5,LingxiaoJIA/gem5