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>
This commit is contained in:
Chris Metcalf
2010-09-15 11:16:10 -04:00
parent 74fca9da09
commit a802fc6854
4 changed files with 34 additions and 7 deletions

View File

@@ -408,6 +408,15 @@ static void save_arch_state(struct thread_struct *t)
#if CHIP_HAS_PROC_STATUS_SPR()
t->proc_status = __insn_mfspr(SPR_PROC_STATUS);
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
t->interrupt_vector_base = __insn_mfspr(SPR_INTERRUPT_VECTOR_BASE_0);
#endif
#if CHIP_HAS_TILE_RTF_HWM()
t->tile_rtf_hwm = __insn_mfspr(SPR_TILE_RTF_HWM);
#endif
#if CHIP_HAS_DSTREAM_PF()
t->dstream_pf = __insn_mfspr(SPR_DSTREAM_PF);
#endif
}
static void restore_arch_state(const struct thread_struct *t)
@@ -428,14 +437,14 @@ static void restore_arch_state(const struct thread_struct *t)
#if CHIP_HAS_PROC_STATUS_SPR()
__insn_mtspr(SPR_PROC_STATUS, t->proc_status);
#endif
#if !CHIP_HAS_FIXED_INTVEC_BASE()
__insn_mtspr(SPR_INTERRUPT_VECTOR_BASE_0, t->interrupt_vector_base);
#endif
#if CHIP_HAS_TILE_RTF_HWM()
/*
* Clear this whenever we switch back to a process in case
* the previous process was monkeying with it. Even if enabled
* in CBOX_MSR1 via TILE_RTF_HWM_MIN, it's still just a
* performance hint, so isn't worth a full save/restore.
*/
__insn_mtspr(SPR_TILE_RTF_HWM, 0);
__insn_mtspr(SPR_TILE_RTF_HWM, t->tile_rtf_hwm);
#endif
#if CHIP_HAS_DSTREAM_PF()
__insn_mtspr(SPR_DSTREAM_PF, t->dstream_pf);
#endif
}