[Qemu-devel] [PULL 05/17] ppc: Improve emulation of THRM registers

[David Gibson]

From: Benjamin Herrenschmidt <address@hidden>

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>
[dwg: Fixed typo in comment, a number of minor checkpatch warnings,
 and a compile failure with CONFIG_USER_ONLY]
Signed-off-by: David Gibson <address@hidden>
---
 target-ppc/helper.h         |  1 +
 target-ppc/misc_helper.c    | 41 +++++++++++++++++++++++++++++++++++++++++
 target-ppc/translate_init.c | 15 ++++++++++++---
 3 files changed, 54 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..cb5ebf5 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 make MacOS not hang. These registers exist on some
+ * 75x and 74xx processors.
+ */
+void helper_fixup_thrm(CPUPPCState *env)
+{
+    target_ulong v, t;
+    int i;
+
+#define THRM1_TIN       (1 << 31)
+#define THRM1_TIV       (1 << 30)
+#define THRM1_THRES(x)  (((x) & 0x7f) << 23)
+#define THRM1_TID       (1 << 2)
+#define THRM1_TIE       (1 << 1)
+#define THRM1_V         (1 << 0)
+#define THRM3_E         (1 << 0)
+
+    if (!(env->spr[SPR_THRM3] & THRM3_E)) {
+        return;
+    }
+
+    /* Note: Thermal interrupts are unimplemented */
+    for (i = SPR_THRM1; i <= SPR_THRM2; i++) {
+        v = env->spr[i];
+        if (!(v & THRM1_V)) {
+            continue;
+        }
+        v |= THRM1_TIV;
+        v &= ~THRM1_TIN;
+        t = v & THRM1_THRES(127);
+        if ((v & THRM1_TID) && t < THRM1_THRES(24)) {
+            v |= THRM1_TIN;
+        }
+        if (!(v & THRM1_TID) && t > THRM1_THRES(24)) {
+            v |= THRM1_TIN;
+        }
+        env->spr[i] = v;
+    }
+}
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index ca894ff..c847a3e 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -1179,23 +1179,32 @@ static void gen_spr_amr(CPUPPCState *env, bool has_iamr)
 }
 #endif /* TARGET_PPC64 */
 
+#ifndef CONFIG_USER_ONLY
+static void spr_read_thrm(DisasContext *ctx, int gprn, int sprn)
+{
+    gen_helper_fixup_thrm(cpu_env);
+    gen_load_spr(cpu_gpr[gprn], sprn);
+    spr_load_dump_spr(sprn);
+}
+#endif /* !CONFIG_USER_ONLY */
+
 static void gen_spr_thrm (CPUPPCState *env)
 {
     /* Thermal management */
     /* XXX : not implemented */
     spr_register(env, SPR_THRM1, "THRM1",
                  SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
+                 &spr_read_thrm, &spr_write_generic,
                  0x00000000);
     /* XXX : not implemented */
     spr_register(env, SPR_THRM2, "THRM2",
                  SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
+                 &spr_read_thrm, &spr_write_generic,
                  0x00000000);
     /* XXX : not implemented */
     spr_register(env, SPR_THRM3, "THRM3",
                  SPR_NOACCESS, SPR_NOACCESS,
-                 &spr_read_generic, &spr_write_generic,
+                 &spr_read_thrm, &spr_write_generic,
                  0x00000000);
 }
 
-- 
2.5.5