Remove lazy FPU switch support from amd64.
It is incompatible with some future features. Sponsored by: The FreeBSD Foundation MFC after: 1 week
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99b81dcb9e
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=348802
@ -154,11 +154,6 @@ static void fpu_clean_state(void);
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SYSCTL_INT(_hw, HW_FLOATINGPT, floatingpoint, CTLFLAG_RD,
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SYSCTL_NULL_INT_PTR, 1, "Floating point instructions executed in hardware");
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int lazy_fpu_switch = 0;
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SYSCTL_INT(_hw, OID_AUTO, lazy_fpu_switch, CTLFLAG_RWTUN | CTLFLAG_NOFETCH,
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&lazy_fpu_switch, 0,
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"Lazily load FPU context after context switch");
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int use_xsave; /* non-static for cpu_switch.S */
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uint64_t xsave_mask; /* the same */
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static uma_zone_t fpu_save_area_zone;
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@ -269,7 +264,6 @@ fpuinit_bsp1(void)
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uint64_t xsave_mask_user;
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bool old_wp;
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TUNABLE_INT_FETCH("hw.lazy_fpu_switch", &lazy_fpu_switch);
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if (!use_xsave)
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return;
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cpuid_count(0xd, 0x0, cp);
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@ -774,8 +768,7 @@ void
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fpu_activate_sw(struct thread *td)
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{
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if (lazy_fpu_switch || (td->td_pflags & TDP_KTHREAD) != 0 ||
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!PCB_USER_FPU(td->td_pcb)) {
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if ((td->td_pflags & TDP_KTHREAD) != 0 || !PCB_USER_FPU(td->td_pcb)) {
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PCPU_SET(fpcurthread, NULL);
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start_emulating();
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} else if (PCPU_GET(fpcurthread) != td) {
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