PCCS_MAGIC
cisr.cis_magic = PCCS_MAGIC;
csr.cs_magic = PCCS_MAGIC;
if (cisr->cis_magic != PCCS_MAGIC ||
csr.cs_magic = PCCS_MAGIC;
if (reg->cs_magic != PCCS_MAGIC ||
#define CS_MAGIC PCCS_MAGIC