GDT_LWPGS
set_usegd(&gdt[GDT_LWPGS], SDP_SHORT, NULL, SDP_LIMIT_MAX, SDT_MEMRWA,
ASSERT(bcmp(&CPU->cpu_gdt[GDT_LWPGS], &lwp->lwp_pcb.pcb_gsdesc,
gdt_update_usegd(GDT_LWPGS, &pcb->pcb_gsdesc);
gdt_update_usegd(GDT_LWPGS, &pcb->pcb_gsdesc);
#define LWPGS_SEL SEL_GDT(GDT_LWPGS, SEL_UPL)
gdt_update_usegd(GDT_LWPGS, &pcb->pcb_gsdesc);