From 9332f9dafa33b085488a5369333213d549dbdc7f Mon Sep 17 00:00:00 2001
From: bellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>
Date: Sat, 26 Nov 2005 10:46:39 +0000
Subject: [PATCH] ARM CPU suspend/halt (Paul Brook)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1663 c046a42c-6fe2-441c-8c8c-71466251a162
---
 cpu-exec.c             | 11 +++++++++++
 target-arm/cpu.h       |  2 +-
 target-arm/op.c        |  7 +++++++
 target-arm/translate.c |  9 +++++++++
 4 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/cpu-exec.c b/cpu-exec.c
index f411eccf81..cddea532a4 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -274,6 +274,17 @@ int cpu_exec(CPUState *env1)
             return EXCP_HALTED;
         }
     }
+#elif defined(TARGET_ARM)
+    if (env1->halted) {
+        /* An interrupt wakes the CPU even if the I and F CPSR bits are
+           set.  */
+        if (env1->interrupt_request
+            & (CPU_INTERRUPT_FIQ | CPU_INTERRUPT_HARD)) {
+            env1->halted = 0;
+        } else {
+            return EXCP_HALTED;
+        }
+    }
 #endif
 
     cpu_single_env = env1; 
diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index 1c1233c198..3b36839e4b 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -90,7 +90,7 @@ typedef struct CPUARMState {
     int exception_index;
     int interrupt_request;
     int user_mode_only;
-    uint32_t address;
+    int halted;
 
     /* VFP coprocessor state.  */
     struct {
diff --git a/target-arm/op.c b/target-arm/op.c
index 09449f28e4..35419a1b71 100644
--- a/target-arm/op.c
+++ b/target-arm/op.c
@@ -878,6 +878,13 @@ void OPPROTO op_debug(void)
     cpu_loop_exit();
 }
 
+void OPPROTO op_wfi(void)
+{
+    env->exception_index = EXCP_HLT;
+    env->halted = 1;
+    cpu_loop_exit();
+}
+
 /* VFP support.  We follow the convention used for VFP instrunctions:
    Single precition routines have a "s" suffix, double precision a
    "d" suffix.  */
diff --git a/target-arm/translate.c b/target-arm/translate.c
index 8df10bebc8..930826cab9 100644
--- a/target-arm/translate.c
+++ b/target-arm/translate.c
@@ -496,6 +496,15 @@ static int disas_cp15_insn(DisasContext *s, uint32_t insn)
     if (IS_USER(s)) {
         return 1;
     }
+    if ((insn & 0x0fff0fff) == 0x0e070f90
+        || (insn & 0x0fff0fff) == 0x0e070f58) {
+        /* Wait for interrupt.  */
+        gen_op_movl_T0_im((long)s->pc);
+        gen_op_movl_reg_TN[0][15]();
+        gen_op_wfi();
+        s->is_jmp = DISAS_JUMP;
+        return 0;
+    }
     rd = (insn >> 12) & 0xf;
     if (insn & (1 << 20)) {
         gen_op_movl_T0_cp15(insn);
-- 
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