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[PATCH] MIPS - fix cycle counter timing calculations
From: |
Simon Burge |
Subject: |
[PATCH] MIPS - fix cycle counter timing calculations |
Date: |
Tue, 16 Nov 2021 18:26:06 +1100 |
The cp0_count_ns value is calculated from the CP0_COUNT_RATE_DEFAULT
constant in target/mips/cpu.c. The cycle counter resolution is defined
per-CPU in target/mips/cpu-defs.c.inc; use this value for calculating
cp0_count_ns. Fixings timing problems on guest OSs for the 20Kc CPU
which has a CCRes of 1.
---
target/mips/cpu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 4aae23934b..0766e25693 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -440,8 +440,9 @@ static void mips_cp0_period_set(MIPSCPU *cpu)
{
CPUMIPSState *env = &cpu->env;
+ /* env->CCRes isn't initialised this early, use env->cpu_model->CCRes. */
env->cp0_count_ns = clock_ticks_to_ns(MIPS_CPU(cpu)->clock,
- cpu->cp0_count_rate);
+ env->cpu_model->CCRes);
assert(env->cp0_count_ns);
}
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