Date: Thu, 14 Apr 2005 03:09:00 GMT From: David Xu <davidxu@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 75128 for review Message-ID: <200504140309.j3E390bD014975@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=75128 Change 75128 by davidxu@davidxu_celeron on 2005/04/14 03:08:49 Implement cpu_set_user_tls. Affected files ... .. //depot/projects/davidxu_thread/src/sys/i386/i386/vm_machdep.c#7 edit Differences ... ==== //depot/projects/davidxu_thread/src/sys/i386/i386/vm_machdep.c#7 (text+ko) ==== @@ -469,6 +469,48 @@ (int)arg); } +void +cpu_set_user_tls(struct thread *td, void *tls_base, size_t tls_size, + int tls_seg) +{ + struct segment_descriptor sd; + uint32_t base; + + /* + * Construct a descriptor and store it in the pcb for + * the next context switch. Also store it in the gdt + * so that the load of tf_fs into %fs will activate it + * at return to userland. + */ + base = (uint32_t)tls_base; + sd.sd_lobase = base & 0xffffff; + sd.sd_hibase = (base >> 24) & 0xff; + sd.sd_lolimit = 0xffff; /* 4GB limit, wraps around */ + sd.sd_hilimit = 0xf; + sd.sd_type = SDT_MEMRWA; + sd.sd_dpl = SEL_UPL; + sd.sd_p = 1; + sd.sd_xx = 0; + sd.sd_def32 = 1; + sd.sd_gran = 1; + mtx_lock_spin(&sched_lock); + if (tls_seg == 0) { + /* set %gs */ + td->td_pcb->pcb_gsd = sd; + if (td == curthread) { + PCPU_GET(fsgs_gdt)[1] = sd; + load_gs(GSEL(GUGS_SEL, SEL_UPL)); + } + } else { + /* set %fs */ + td->td_pcb->pcb_fsd = sd; + if (td == curthread) + PCPU_GET(fsgs_gdt)[0] = sd; + td->td_frame->tf_fs = GSEL(GUFS_SEL, SEL_UPL); + } + mtx_unlock_spin(&sched_lock); +} + /* * Convert kernel VA to physical address */
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