amd64: Use ifuncs to select suitable implementation of set_pcb_flags().
There is no reason to check for PCB_FULL_IRET if FSGSBASE instructions are not supported. Sponsored by: The FreeBSD Foundation MFC after: 1 week
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6d7f919489
commit
9775a6ebd2
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=339895
@ -2616,15 +2616,14 @@ set_pcb_flags_raw(struct pcb *pcb, const u_int flags)
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* the PCB_FULL_IRET flag is set. We disable interrupts to sync with
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* context switches.
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*/
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void
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set_pcb_flags(struct pcb *pcb, const u_int flags)
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static void
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set_pcb_flags_fsgsbase(struct pcb *pcb, const u_int flags)
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{
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register_t r;
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if (curpcb == pcb &&
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(flags & PCB_FULL_IRET) != 0 &&
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(pcb->pcb_flags & PCB_FULL_IRET) == 0 &&
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(cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0) {
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(pcb->pcb_flags & PCB_FULL_IRET) == 0) {
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r = intr_disable();
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if ((pcb->pcb_flags & PCB_FULL_IRET) == 0) {
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if (rfs() == _ufssel)
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@ -2639,6 +2638,13 @@ set_pcb_flags(struct pcb *pcb, const u_int flags)
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}
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}
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DEFINE_IFUNC(, void, set_pcb_flags, (struct pcb *, const u_int), static)
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{
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return ((cpu_stdext_feature & CPUID_STDEXT_FSGSBASE) != 0 ?
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set_pcb_flags_fsgsbase : set_pcb_flags_raw);
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}
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void
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clear_pcb_flags(struct pcb *pcb, const u_int flags)
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{
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