PCR_SPEED_HALF     36 drivers/cpufreq/maple-cpufreq.c #define PCR_SPEED_HALF		0x00020000U	/* 1:2 speed value */
PCR_SPEED_HALF     42 drivers/cpufreq/pmac64-cpufreq.c #define PCR_SPEED_HALF		0x00020000U	/* 1:2 speed value */