arch/tile: Save and restore extra user state for tilegx
During context switch, save and restore a couple of additional bits of tilegx user state that can be persistently modified by userspace. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
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@@ -408,6 +408,15 @@ static void save_arch_state(struct thread_struct *t)
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#if CHIP_HAS_PROC_STATUS_SPR()
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t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
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#endif
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#if !CHIP_HAS_FIXED_INTVEC_BASE()
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t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
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#endif
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#if CHIP_HAS_TILE_RTF_HWM()
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t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
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#endif
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#if CHIP_HAS_DSTREAM_PF()
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t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
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#endif
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}
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static void restore_arch_state(const struct thread_struct *t)
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@@ -428,14 +437,14 @@ static void restore_arch_state(const struct thread_struct *t)
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#if CHIP_HAS_PROC_STATUS_SPR()
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__insn_mtspr(SPR_PROC_STATUS, t->proc_status);
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#endif
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#if !CHIP_HAS_FIXED_INTVEC_BASE()
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__insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
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#endif
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#if CHIP_HAS_TILE_RTF_HWM()
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/*
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* Clear this whenever we switch back to a process in case
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* the previous process was monkeying with it. Even if enabled
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* in CBOX_MSR1 via TILE_RTF_HWM_MIN, it's still just a
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* performance hint, so isn't worth a full save/restore.
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*/
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__insn_mtspr(SPR_TILE_RTF_HWM, 0);
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__insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
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#endif
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#if CHIP_HAS_DSTREAM_PF()
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__insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
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#endif
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}
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