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authorDavid Gibson <david@gibson.dropbear.id.au>2020-01-06 17:26:24 +1100
committerDavid Gibson <david@gibson.dropbear.id.au>2020-03-17 09:41:15 +1100
commit3a56a55ccb2e31e3a52d74db2ddd8ea603ea667b (patch)
tree3be220e10e3b668ce3939eef60727592db192e96 /target/ppc
parentd37b40daf647aaf2f5e4c4dfcd62c9412ff05009 (diff)
target/ppc: Only calculate RMLS derived RMA limit on demand
When the LPCR is written, we update the env->rmls field with the RMA limit it implies. Simplify things by just calculating the value directly from the LPCR value when we need it. It's possible this is a little slower, but it's unlikely to be significant, since this is only for real mode accesses in a translation configuration that's not used very often, and the whole thing is behind the qemu TLB anyway. Therefore, keeping the number of state variables down and not having to worry about making sure it's always in sync seems the better option. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Greg Kurz <groug@kaod.org> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Diffstat (limited to 'target/ppc')
-rw-r--r--target/ppc/cpu.h1
-rw-r--r--target/ppc/mmu-hash64.c9
2 files changed, 6 insertions, 4 deletions
diff --git a/target/ppc/cpu.h b/target/ppc/cpu.h
index 8077fdb068..f9871b1233 100644
--- a/target/ppc/cpu.h
+++ b/target/ppc/cpu.h
@@ -1046,7 +1046,6 @@ struct CPUPPCState {
uint64_t insns_flags2;
#if defined(TARGET_PPC64)
ppc_slb_t vrma_slb;
- target_ulong rmls;
#endif
int error_code;
diff --git a/target/ppc/mmu-hash64.c b/target/ppc/mmu-hash64.c
index fcccaabb88..4fd7b7ee74 100644
--- a/target/ppc/mmu-hash64.c
+++ b/target/ppc/mmu-hash64.c
@@ -837,8 +837,10 @@ int ppc_hash64_handle_mmu_fault(PowerPCCPU *cpu, vaddr eaddr,
goto skip_slb_search;
} else {
+ target_ulong limit = rmls_limit(cpu);
+
/* Emulated old-style RMO mode, bounds check against RMLS */
- if (raddr >= env->rmls) {
+ if (raddr >= limit) {
if (rwx == 2) {
ppc_hash64_set_isi(cs, SRR1_PROTFAULT);
} else {
@@ -1000,8 +1002,10 @@ hwaddr ppc_hash64_get_phys_page_debug(PowerPCCPU *cpu, target_ulong addr)
return -1;
}
} else {
+ target_ulong limit = rmls_limit(cpu);
+
/* Emulated old-style RMO mode, bounds check against RMLS */
- if (raddr >= env->rmls) {
+ if (raddr >= limit) {
return -1;
}
return raddr | env->spr[SPR_RMOR];
@@ -1091,7 +1095,6 @@ void ppc_store_lpcr(PowerPCCPU *cpu, target_ulong val)
CPUPPCState *env = &cpu->env;
env->spr[SPR_LPCR] = val & pcc->lpcr_mask;
- env->rmls = rmls_limit(cpu);
ppc_hash64_update_vrma(cpu);
}