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| author | David Gibson <david@gibson.dropbear.id.au> | 2016-01-27 11:07:29 +1100 |
|---|---|---|
| committer | David Gibson <david@gibson.dropbear.id.au> | 2016-01-30 23:37:38 +1100 |
| commit | bcd81230037f60a2fc9c2e903f8f07db68f86ce8 (patch) | |
| tree | ac88c4bf9067a8fa3e89586699fa99224bd70d75 /target-ppc/mmu_helper.c | |
| parent | 7ef23068bfa413605de8ae7e3e654d9198369fa8 (diff) | |
| download | qemu-bcd81230037f60a2fc9c2e903f8f07db68f86ce8.tar.gz | |
target-ppc: Rework ppc_store_slb
ppc_store_slb updates the SLB for PPC cpus with 64-bit hash MMUs.
Currently it takes two parameters, which contain values encoded as the
register arguments to the slbmte instruction, one register contains the
ESID portion of the SLBE and also the slot number, the other contains the
VSID portion of the SLBE.
We're shortly going to want to do some SLB updates from other code where
it is more convenient to supply the slot number and ESID separately, so
rework this function and its callers to work this way.
As a bonus, this slightly simplifies the emulation of segment registers for
when running a 32-bit OS on a 64-bit CPU.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Reviewed-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'target-ppc/mmu_helper.c')
| -rw-r--r-- | target-ppc/mmu_helper.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/target-ppc/mmu_helper.c b/target-ppc/mmu_helper.c index 2446bba13c..727788950c 100644 --- a/target-ppc/mmu_helper.c +++ b/target-ppc/mmu_helper.c @@ -2089,21 +2089,17 @@ void helper_store_sr(CPUPPCState *env, target_ulong srnum, target_ulong value) (int)srnum, value, env->sr[srnum]); #if defined(TARGET_PPC64) if (env->mmu_model & POWERPC_MMU_64) { - uint64_t rb = 0, rs = 0; + uint64_t esid, vsid; /* ESID = srnum */ - rb |= ((uint32_t)srnum & 0xf) << 28; - /* Set the valid bit */ - rb |= SLB_ESID_V; - /* Index = ESID */ - rb |= (uint32_t)srnum; + esid = ((uint64_t)(srnum & 0xf) << 28) | SLB_ESID_V; /* VSID = VSID */ - rs |= (value & 0xfffffff) << 12; + vsid = (value & 0xfffffff) << 12; /* flags = flags */ - rs |= ((value >> 27) & 0xf) << 8; + vsid |= ((value >> 27) & 0xf) << 8; - ppc_store_slb(cpu, rb, rs); + ppc_store_slb(cpu, srnum, esid, vsid); } else #endif if (env->sr[srnum] != value) { |