[Qemu-devel] [PATCH v4 3/7] arm: add dummy v7 cp15 config_base_register

[Mark Langsdorf <mark.langsdorf@calxeda.com>]

Add a cp15 config_base_register that currently defaults to 0.
After the QOM CPU support is added, the value will be properly
set to the periphal base value.

Signed-off-by: Mark Langsdorf <mark.langsdorf@calxeda.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
Changes from v3
	None
Changes from v2
        Added test against op2 
Changes from v1
        renamed the register
        added comments about how it will change when QOM CPUs are added

 target-arm/cpu.h    |    1 +
 target-arm/helper.c |   14 ++++++++++++++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/target-arm/cpu.h b/target-arm/cpu.h
index c4d742f..449e620 100644
--- a/target-arm/cpu.h
+++ b/target-arm/cpu.h
@@ -149,6 +149,7 @@ typedef struct CPUARMState {
         uint32_t c15_i_max; /* Maximum D-cache dirty line index.  */
         uint32_t c15_i_min; /* Minimum D-cache dirty line index.  */
         uint32_t c15_threadid; /* TI debugger thread-ID.  */
+        uint32_t c15_config_base_address; /* SCU base address.  */
     } cp15;
 
     struct {
diff --git a/target-arm/helper.c b/target-arm/helper.c
index 65f4fbf..b235fed 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -2111,6 +2111,20 @@ uint32_t HELPER(get_cp15)(CPUState *env, uint32_t insn)
              * 0x200 << ($rn & 0xfff), when MMU is off.  */
             goto bad_reg;
         }
+        if (ARM_CPUID(env) == ARM_CPUID_CORTEXA9) {
+            switch (crm) {
+            case 0:
+                /* The config_base_address should hold the value of
+                 * the peripheral base. ARM should get this from a CPU
+                 * object property, but that support isn't available in
+                 * December 2011. Default to 0 for now and board models
+                 * that care can set it by a private hook */
+                if ((op1 == 4) && (op2 == 0)) {
+                    return env->cp15.c15_config_base_address;
+                }
+            }
+            goto bad_reg;
+        }
         return 0;
     }
 bad_reg:
-- 
1.7.5.4