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[v5,10/13] target/arm: PMU: Set PMCR.N to 4

Message ID 1529699547-17044-11-git-send-email-alindsay@codeaurora.org (mailing list archive)
State New, archived
Headers show

Commit Message

Aaron Lindsay June 22, 2018, 8:32 p.m. UTC 
This both advertises that we support four counters and adds them to the
implementation because the PMU_NUM_COUNTERS macro reads this value from
the PMCR.

Signed-off-by: Aaron Lindsay <alindsay@codeaurora.org>
---
 target/arm/helper.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/target/arm/helper.c b/target/arm/helper.c
index 92ebd21..3720239 100644
--- a/target/arm/helper.c
+++ b/target/arm/helper.c
@@ -1618,7 +1618,7 @@  static const ARMCPRegInfo v7_cp_reginfo[] = {
       .access = PL1_W, .type = ARM_CP_NOP },
     /* Performance monitors are implementation defined in v7,
      * but with an ARM recommended set of registers, which we
-     * follow (although we don't actually implement any counters)
+     * follow.
      *
      * Performance registers fall into three categories:
      *  (a) always UNDEF in PL0, RW in PL1 (PMINTENSET, PMINTENCLR)
@@ -5234,7 +5234,8 @@  void register_cp_regs_for_features(ARMCPU *cpu)
             .access = PL0_RW, .accessfn = pmreg_access,
             .type = ARM_CP_IO,
             .fieldoffset = offsetof(CPUARMState, cp15.c9_pmcr),
-            .resetvalue = cpu->midr & 0xff000000,
+            /* 4 counters enabled */
+            .resetvalue = (cpu->midr & 0xff000000) | (0x4 << PMCRN_SHIFT),
             .writefn = pmcr_write, .raw_writefn = raw_write,
         };
         define_one_arm_cp_reg(cpu, &pmcr);