[Qemu-devel] [PATCH 05/27] Implement missing parts of the logic for the POWER PURR

[David Gibson <david@gibson.dropbear.id.au>]

The PURR (Processor Utilization Resource Register) is a register found
on recent POWER CPUs.  The guts of implementing it at least enough to
get by are already present in qemu, however some of the helper
functions needed to actually wire it up are missing.

This patch adds the necessary glue, so that the PURR can be wired up
when we implement newer POWER CPU targets which include it.

Signed-off-by: David Gibson <dwg@au1.ibm.com>
---
 target-ppc/helper.h         |    1 +
 target-ppc/op_helper.c      |    5 +++++
 target-ppc/translate_init.c |    6 ++++++
 3 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/target-ppc/helper.h b/target-ppc/helper.h
index 1a69cf8..4227897 100644
--- a/target-ppc/helper.h
+++ b/target-ppc/helper.h
@@ -371,6 +371,7 @@ DEF_HELPER_0(load_tbl, tl)
 DEF_HELPER_0(load_tbu, tl)
 DEF_HELPER_0(load_atbl, tl)
 DEF_HELPER_0(load_atbu, tl)
+DEF_HELPER_0(load_purr, tl)
 DEF_HELPER_0(load_601_rtcl, tl)
 DEF_HELPER_0(load_601_rtcu, tl)
 #if !defined(CONFIG_USER_ONLY)
diff --git a/target-ppc/op_helper.c b/target-ppc/op_helper.c
index bdb1f17..b9b5ae2 100644
--- a/target-ppc/op_helper.c
+++ b/target-ppc/op_helper.c
@@ -86,6 +86,11 @@ target_ulong helper_load_atbu (void)
     return cpu_ppc_load_atbu(env);
 }
 
+target_ulong helper_load_purr (void)
+{
+    return (target_ulong)cpu_ppc_load_purr(env);
+}
+
 target_ulong helper_load_601_rtcl (void)
 {
     return cpu_ppc601_load_rtcl(env);
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 7c08b1c..f9ed0fa 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -251,6 +251,12 @@ static void spr_write_atbu (void *opaque, int sprn, int gprn)
 {
     gen_helper_store_atbu(cpu_gpr[gprn]);
 }
+
+__attribute__ (( unused ))
+static void spr_read_purr (void *opaque, int gprn, int sprn)
+{
+    gen_helper_load_purr(cpu_gpr[gprn]);
+}
 #endif
 
 #if !defined(CONFIG_USER_ONLY)
-- 
1.7.1