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target/mips: Don't use clock_get_ns() in clock period calculation 

Currently the MIPS code uses the old clock_get_ns() API to
calculate a time length in nanoseconds:
 cpu->cp0_count_rate * clock_get_ns(MIPS_CPU(cpu)->clock)

This relies on the clock having a period which is an exact number
of nanoseconds.

Switch to the new clock_ticks_to_ns() function, which does the
multiplication internally at a higher precision.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Tested-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201215150929.30311-3-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Peter Maydell 2020-12-15 15:09:27 +00:00 committed by Philippe Mathieu-Daudé
parent 554d523785
commit 0ac1fb2567
1 changed files with 2 additions and 2 deletions
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4
target/mips/cpu.c
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@ -380,8 +380,8 @@ static void mips_cp0_period_set(MIPSCPU *cpu)
{
CPUMIPSState *env = &cpu->env;
env->cp0_count_ns = cpu->cp0_count_rate
* clock_get_ns(MIPS_CPU(cpu)->clock);
env->cp0_count_ns = clock_ticks_to_ns(MIPS_CPU(cpu)->clock,
cpu->cp0_count_rate);
assert(env->cp0_count_ns);
}