diff options
| author | David S. Miller <davem@sunset.davemloft.net> | 2006-02-04 00:10:01 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2006-03-20 01:11:36 -0800 |
| commit | 314ef6859750b6539eac48d78059bb7986f29cb1 (patch) | |
| tree | 26c7da386349c1cf377225356e1012ae62da6f07 /arch/sparc64/kernel/rtrap.S | |
| parent | ffe483d55229fadbaf4cc7316d47024a24ecd1a2 (diff) | |
[SPARC64]: Refine register window trap handling.
When saving and restoing trap state, do the window spill/fill
handling inline so that we never trap deeper than 2 trap levels.
This is important for chips like Niagara.
The window fixup code is massively simplified, and many more
improvements are now possible.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/rtrap.S')
| -rw-r--r-- | arch/sparc64/kernel/rtrap.S | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S index 61bd45e7697e..ecfbbdc56125 100644 --- a/arch/sparc64/kernel/rtrap.S +++ b/arch/sparc64/kernel/rtrap.S @@ -267,15 +267,69 @@ rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1 wrpr %l2, %g0, %canrestore wrpr %l1, %g0, %wstate - wrpr %g0, %g0, %otherwin + brnz,pt %l2, user_rtt_restore + wrpr %g0, %g0, %otherwin + + ldx [%g6 + TI_FLAGS], %g3 + wr %g0, ASI_AIUP, %asi + rdpr %cwp, %g1 + andcc %g3, _TIF_32BIT, %g0 + sub %g1, 1, %g1 + bne,pt %xcc, user_rtt_fill_32bit + wrpr %g1, %cwp + ba,a,pt %xcc, user_rtt_fill_64bit + +user_rtt_fill_fixup: + rdpr %cwp, %g1 + add %g1, 1, %g1 + wrpr %g1, 0x0, %cwp + + rdpr %wstate, %g2 + sll %g2, 3, %g2 + wrpr %g2, 0x0, %wstate + + /* We know %canrestore and %otherwin are both zero. */ + + sethi %hi(sparc64_kern_pri_context), %g2 + ldx [%g2 + %lo(sparc64_kern_pri_context)], %g2 + mov PRIMARY_CONTEXT, %g1 + stxa %g2, [%g1] ASI_DMMU + sethi %hi(KERNBASE), %g1 + flush %g1 + + or %g4, FAULT_CODE_WINFIXUP, %g4 + stb %g4, [%g6 + TI_FAULT_CODE] + stx %g5, [%g6 + TI_FAULT_ADDR] + + mov %g6, %l1 + wrpr %g0, 0x0, %tl + wrpr %g0, RTRAP_PSTATE, %pstate + mov %l1, %g6 + ldx [%g6 + TI_TASK], %g4 + LOAD_PER_CPU_BASE(%g5, %g6, %g1, %g2, %g3) + call do_sparc64_fault + add %sp, PTREGS_OFF, %o0 + ba,pt %xcc, rtrap + nop + +user_rtt_pre_restore: + add %g1, 1, %g1 + wrpr %g1, 0x0, %cwp + +user_rtt_restore: restore rdpr %canrestore, %g1 wrpr %g1, 0x0, %cleanwin retry nop -kern_rtt: restore +kern_rtt: rdpr %canrestore, %g1 + brz,pn %g1, kern_rtt_fill + nop +kern_rtt_restore: + restore retry + to_kernel: #ifdef CONFIG_PREEMPT ldsw [%g6 + TI_PRE_COUNT], %l5 |