The 75x and 74xx processors have some thermal monitoring SPRs that
some OSes such as MacOS do use. Our current "dumb" implementation
isn't good enough and will cause some versions of MacOS to hang during
boot.
This lifts an improved emulation from MacOnLinux and adapts it to
qemu, thus fixing the problem.
Signed-off-by: Benjamin Herrenschmidt <address@hidden>
---
target-ppc/helper.h | 1 +
target-ppc/misc_helper.c | 41 +++++++++++++++++++++++++++++++++++++++++
target-ppc/translate_init.c | 13 ++++++++++---
3 files changed, 52 insertions(+), 3 deletions(-)
diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index f4410a8..18eb52f 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -670,3 +670,4 @@ DEF_HELPER_4(dscli, void, env, fprp, fprp, i32)
DEF_HELPER_4(dscliq, void, env, fprp, fprp, i32)
DEF_HELPER_1(tbegin, void, env)
+DEF_HELPER_1(fixup_thrm, void, env)
diff --git a/target-ppc/misc_helper.c b/target-ppc/misc_helper.c
index 7d41b01..4315778 100644
--- a/target-ppc/misc_helper.c
+++ b/target-ppc/misc_helper.c
@@ -166,3 +166,44 @@ void ppc_store_msr(CPUPPCState *env, target_ulong value)
{
hreg_store_msr(env, value, 0);
}
+
+/* This code is lifted from MacOnLinux. It is called whenever
+ * THRM1,2 or 3 is read an fixes up the values in such a way
+ * that will mac MacOS not hang. These registers exist on some