aboutsummaryrefslogtreecommitdiffstats
path: root/arch/sparc64/kernel/rtrap.S
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2006-01-31 21:29:18 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 04:11:13 -0500
commit74bf4312fff083ab25c3f357cc653ada7995e5f6 (patch)
treec23dea461e32485f4cd7ca4b8c33c632655eb906 /arch/sparc64/kernel/rtrap.S
parent30d4d1ffed7098afe2641536d67eef150499da02 (diff)
[SPARC64]: Move away from virtual page tables, part 1.
We now use the TSB hardware assist features of the UltraSPARC MMUs. SMP is currently knowingly broken, we need to find another place to store the per-cpu base pointers. We hid them away in the TSB base register, and that obviously will not work any more :-) Another known broken case is non-8KB base page size. Also noticed that flush_tlb_all() is not referenced anywhere, only the internal __flush_tlb_all() (local cpu only) is used by the sparc64 port, so we can get rid of flush_tlb_all(). The kernel gets it's own 8KB TSB (swapper_tsb) and each address space gets it's own private 8K TSB. Later we can add code to dynamically increase the size of per-process TSB as the RSS grows. An 8KB TSB is good enough for up to about a 4MB RSS, after which the TSB starts to incur many capacity and conflict misses. We even accumulate OBP translations into the kernel TSB. Another area for refinement is large page size support. We could use a secondary address space TSB to handle those. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/rtrap.S')
-rw-r--r--arch/sparc64/kernel/rtrap.S6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/sparc64/kernel/rtrap.S b/arch/sparc64/kernel/rtrap.S
index b80eba0081ca..213eb4a9d8a4 100644
--- a/arch/sparc64/kernel/rtrap.S
+++ b/arch/sparc64/kernel/rtrap.S
@@ -223,10 +223,14 @@ rt_continue: ldx [%sp + PTREGS_OFF + PT_V9_G1], %g1
223 ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3 223 ldx [%sp + PTREGS_OFF + PT_V9_G3], %g3
224 ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4 224 ldx [%sp + PTREGS_OFF + PT_V9_G4], %g4
225 ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5 225 ldx [%sp + PTREGS_OFF + PT_V9_G5], %g5
226#ifdef CONFIG_SMP
227#error IMMU TSB usage must be fixed
226 mov TSB_REG, %g6 228 mov TSB_REG, %g6
227 brnz,a,pn %l3, 1f 229 brnz,a,pn %l3, 1f
228 ldxa [%g6] ASI_IMMU, %g5 230 ldxa [%g6] ASI_IMMU, %g5
2291: ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6 231#endif
2321:
233 ldx [%sp + PTREGS_OFF + PT_V9_G6], %g6
230 ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7 234 ldx [%sp + PTREGS_OFF + PT_V9_G7], %g7
231 wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate 235 wrpr %g0, RTRAP_PSTATE_AG_IRQOFF, %pstate
232 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0 236 ldx [%sp + PTREGS_OFF + PT_V9_I0], %i0