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[PULL,22/25] target-arm: Implement dummy MDCCINT_EL1

Message ID 1476729644-4595-23-git-send-email-peter.maydell@linaro.org
State New
Headers show

Commit Message

Peter Maydell Oct. 17, 2016, 6:40 p.m. UTC 
MDCCINT_EL1 is part of the DCC debugger communication
channel between the CPU and an attached external debugger.
QEMU doesn't implement this, but since Linux may try
to access this register we need to provide at least
a dummy implementation.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Message-id: 1476294876-12340-2-git-send-email-peter.maydell@linaro.org
---
 target-arm/helper.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index 70e2742..a65f4f2 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -4060,6 +4060,14 @@  static const ARMCPRegInfo debug_cp_reginfo[] = {
       .cp = 14, .opc1 = 0, .crn = 0, .crm = 7, .opc2 = 0,
       .access = PL1_RW, .accessfn = access_tda,
       .type = ARM_CP_NOP },
+    /* Dummy MDCCINT_EL1, since we don't implement the Debug Communications
+     * Channel but Linux may try to access this register. The 32-bit
+     * alias is DBGDCCINT.
+     */
+    { .name = "MDCCINT_EL1", .state = ARM_CP_STATE_BOTH,
+      .cp = 14, .opc0 = 2, .opc1 = 0, .crn = 0, .crm = 2, .opc2 = 0,
+      .access = PL1_RW, .accessfn = access_tda,
+      .type = ARM_CP_NOP },
     REGINFO_SENTINEL
 };