PTB               280 sound/pci/emu10k1/emu10k1_main.c 	snd_emu10k1_ptr_write(emu, PTB, 0, emu->ptb_pages.addr);
PTB               444 sound/pci/emu10k1/emu10k1_main.c 	snd_emu10k1_ptr_write(emu, PTB, 0, 0);