APM_CS 2299 arch/x86/kernel/apm_32.c apm_bios_entry.segment = APM_CS; APM_CS 2312 arch/x86/kernel/apm_32.c set_base(gdt[APM_CS >> 3], APM_CS 39 include/linux/apm_bios.h #define APM_CS_16 (APM_CS + 8)