target-arm: Define and use ARM_FEATURE_CBAR

Some processors (notably A9 within Highbank) define and use the
CP15 configuration base address (CBAR). This is vendor specific
so its best implemented as a CPU property (otherwise we would need
vendor specific child classes for every ARM implementation).

This patch prepares support for converting CBAR reset value to
a CPU property by moving the CP registration out of the CPU
init fn, as registration will need to happen at realize time
to pick up any property updates. The easiest way to do this
is via definition of a new ARM_FEATURE to flag the existence
of the register.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 9f697ef1e2ee60a3b9ef971a7f3bc3fa6752a9b7.1387160489.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 3 insertions, 9 deletions

diff --git a/target-arm/cpu.c b/target-arm/cpu.c
index a03743f4ee..f21e995e2f 100644
--- a/target-arm/cpu.c
+++ b/target-arm/cpu.c
@@ -617,6 +617,7 @@ static void cortex_a9_initfn(Object *obj)
      * and valid configurations; we don't model A9UP).
      */
     set_feature(&cpu->env, ARM_FEATURE_V7MP);
+    set_feature(&cpu->env, ARM_FEATURE_CBAR);
     cpu->midr = 0x410fc090;
     cpu->reset_fpsid = 0x41033090;
     cpu->mvfr0 = 0x11110222;
@@ -639,15 +640,7 @@ static void cortex_a9_initfn(Object *obj)
     cpu->clidr = (1 << 27) | (1 << 24) | 3;
     cpu->ccsidr[0] = 0xe00fe015; /* 16k L1 dcache. */
     cpu->ccsidr[1] = 0x200fe015; /* 16k L1 icache. */
-    {
-        ARMCPRegInfo cbar = {
-            .name = "CBAR", .cp = 15, .crn = 15,  .crm = 0, .opc1 = 4,
-            .opc2 = 0, .access = PL1_R|PL3_W, .resetvalue = cpu->reset_cbar,
-            .fieldoffset = offsetof(CPUARMState, cp15.c15_config_base_address)
-        };
-        define_one_arm_cp_reg(cpu, &cbar);
-        define_arm_cp_regs(cpu, cortexa9_cp_reginfo);
-    }
+    define_arm_cp_regs(cpu, cortexa9_cp_reginfo);
 }
 
 #ifndef CONFIG_USER_ONLY
@@ -686,6 +679,7 @@ static void cortex_a15_initfn(Object *obj)
     set_feature(&cpu->env, ARM_FEATURE_ARM_DIV);
     set_feature(&cpu->env, ARM_FEATURE_GENERIC_TIMER);
     set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
+    set_feature(&cpu->env, ARM_FEATURE_CBAR);
     set_feature(&cpu->env, ARM_FEATURE_LPAE);
     cpu->kvm_target = QEMU_KVM_ARM_TARGET_CORTEX_A15;
     cpu->midr = 0x412fc0f1;