[PATCH v3 59/59] target/arm/hvf: Emulate PhysTimer registers

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

Emulate PhysTimer dispatching to TCG, like we do with GIC registers.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
---
TODO: audit it is safe
---
 target/arm/hvf/hvf.c | 30 +++++++++++++++++++-----------
 1 file changed, 19 insertions(+), 11 deletions(-)

diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c
index 113f1415011..a7b5e4711b0 100644
--- a/target/arm/hvf/hvf.c
+++ b/target/arm/hvf/hvf.c
@@ -189,6 +189,7 @@ void hvf_arm_init_debug(void)
 #define SYSREG_LORC_EL1       SYSREG(3, 0, 10, 4, 3)
 #define SYSREG_CNTPCT_EL0     SYSREG(3, 3, 14, 0, 1)
 #define SYSREG_CNTP_CTL_EL0   SYSREG(3, 3, 14, 2, 1)
+#define SYSREG_CNTP_CVAL_EL0  SYSREG(3, 3, 14, 2, 2)
 #define SYSREG_PMCR_EL0       SYSREG(3, 3, 9, 12, 0)
 #define SYSREG_PMUSERENR_EL0  SYSREG(3, 3, 9, 14, 0)
 #define SYSREG_PMCNTENSET_EL0 SYSREG(3, 3, 9, 12, 1)
@@ -201,6 +202,8 @@ void hvf_arm_init_debug(void)
 #define SYSREG_PMCEID1_EL0    SYSREG(3, 3, 9, 12, 7)
 #define SYSREG_PMCCNTR_EL0    SYSREG(3, 3, 9, 13, 0)
 
+#define SYSREG_CNTP_TVAL_EL0  SYSREG(3, 3, 14, 2, 0)
+#define SYSREG_CNTP_CVAL_EL0  SYSREG(3, 3, 14, 2, 2)
 #define SYSREG_CNTV_CTL_EL0   SYSREG(3, 3, 14, 3, 1)
 #define SYSREG_CNTV_CVAL_EL0  SYSREG(3, 3, 14, 3, 2)
 #define SYSREG_PMCCFILTR_EL0  SYSREG(3, 3, 14, 15, 7)
@@ -1249,16 +1252,20 @@ static int hvf_sysreg_read(CPUState *cpu, uint32_t reg, uint64_t *val)
     }
 
     switch (reg) {
-    case SYSREG_CNTPCT_EL0:
-        *val = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) /
-              gt_cntfrq_period_ns(arm_cpu);
-        return 0;
     case SYSREG_OSLSR_EL1:
         *val = env->cp15.oslsr_el1;
         return 0;
     case SYSREG_OSDLR_EL1:
         /* Dummy register */
         return 0;
+    case SYSREG_CNTP_CTL_EL0:
+    case SYSREG_CNTP_TVAL_EL0:
+    case SYSREG_CNTPCT_EL0:
+        /* Call the TCG sysreg handler. This is only safe for VTimer regs. */
+        if (hvf_sysreg_read_cp(cpu, "VTimer", reg, val)) {
+            return 0;
+        }
+        break;
     case SYSREG_ICC_AP0R0_EL1:
     case SYSREG_ICC_AP0R1_EL1:
     case SYSREG_ICC_AP0R2_EL1:
@@ -1571,19 +1578,20 @@ static int hvf_sysreg_write(CPUState *cpu, uint32_t reg, uint64_t val)
     case SYSREG_OSLAR_EL1:
         env->cp15.oslsr_el1 = val & 1;
         return 0;
-    case SYSREG_CNTP_CTL_EL0:
-        /*
-         * Guests should not rely on the physical counter, but macOS emits
-         * disable writes to it. Let it do so, but ignore the requests.
-         */
-        qemu_log_mask(LOG_UNIMP, "Unsupported write to CNTP_CTL_EL0\n");
-        return 0;
     case SYSREG_OSDLR_EL1:
         /* Dummy register */
         return 0;
     case SYSREG_LORC_EL1:
         /* Dummy register */
         return 0;
+    case SYSREG_CNTP_CTL_EL0:
+    case SYSREG_CNTP_CVAL_EL0:
+    case SYSREG_CNTP_TVAL_EL0:
+        /* Call the TCG sysreg handler. This is only safe for VTimer regs. */
+        if (hvf_sysreg_write_cp(cpu, "VTimer", reg, val)) {
+            return 0;
+        }
+        break;
     case SYSREG_ICC_AP0R0_EL1:
     case SYSREG_ICC_AP0R1_EL1:
     case SYSREG_ICC_AP0R2_EL1:
-- 
2.51.0