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[PULL,03/10] target-arm: implement WFE/YIELD as a yield for AArch64

Message ID 1398956107-7411-4-git-send-email-peter.maydell@linaro.org
State Accepted
Commit 252ec4057685cd9bf6a13f96528c843754af8fad
Headers show

Commit Message

Peter Maydell May 1, 2014, 2:55 p.m. UTC 
From: Rob Herring <rob.herring@linaro.org>

Like was done for AArch32 for WFE, implement both WFE and YIELD as a
yield operation. This speeds up multi-core system emulation.

Signed-off-by: Rob Herring <rob.herring@linaro.org>
Message-id: 1397588401-20366-1-git-send-email-robherring2@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/translate-a64.c | 6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/target-arm/translate-a64.c b/target-arm/translate-a64.c
index d86b8ff..e31e069 100644
--- a/target-arm/translate-a64.c
+++ b/target-arm/translate-a64.c
@@ -1151,6 +1151,8 @@  static void handle_hint(DisasContext *s, uint32_t insn,
         return;
     case 1: /* YIELD */
     case 2: /* WFE */
+        s->is_jmp = DISAS_WFE;
+        return;
     case 4: /* SEV */
     case 5: /* SEVL */
         /* we treat all as NOP at least for now */
@@ -10765,6 +10767,10 @@  void gen_intermediate_code_internal_a64(ARMCPU *cpu,
         case DISAS_EXC:
         case DISAS_SWI:
             break;
+        case DISAS_WFE:
+            gen_a64_set_pc_im(dc->pc);
+            gen_helper_wfe(cpu_env);
+            break;
         case DISAS_WFI:
             /* This is a special case because we don't want to just halt the CPU
              * if trying to debug across a WFI.