G_00015C_MC_FB_TOP 37 drivers/gpu/drm/radeon/rs100d.h #define G_00015C_MC_FB_TOP(x) (((x) >> 16) & 0xFFFF) G_00015C_MC_FB_TOP 44 drivers/gpu/drm/radeon/rs400d.h #define G_00015C_MC_FB_TOP(x) (((x) >> 16) & 0xFFFF)