diff mbox series

[v3,09/20] target/mips/cpu: Calculate the CP0 timer period using the CPU frequency

Message ID 20201010204319.3119239-10-f4bug@amsat.org
State Superseded
Headers show
Series hw/mips: Set CPU frequency | expand

Commit Message

Philippe Mathieu-Daudé Oct. 10, 2020, 8:43 p.m. UTC 
The CP0 timer period is a function of the CPU frequency.
Start using the default values, which will be replaced by
properties in the next commits.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 target/mips/cpu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Comments

Jiaxun Yang Oct. 12, 2020, 5:48 a.m. UTC | #1 
在 2020/10/11 上午4:43, Philippe Mathieu-Daudé 写道:
> The CP0 timer period is a function of the CPU frequency.

> Start using the default values, which will be replaced by

> properties in the next commits.

>

> Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>

> ---

[...]
Thanks

- Jiaxun
diff mbox series

Patch

diff --git a/target/mips/cpu.c b/target/mips/cpu.c
index 84b727fefa8..46188139b7b 100644
--- a/target/mips/cpu.c
+++ b/target/mips/cpu.c
@@ -144,13 +144,13 @@  static void mips_cpu_disas_set_info(CPUState *s, disassemble_info *info)
  */
 #define CPU_FREQ_HZ_DEFAULT     200000000
 #define CP0_COUNT_RATE_DEFAULT  2
-#define TIMER_PERIOD_DEFAULT    10  /* 1 / (CPU_FREQ_HZ / CP0_COUNT_RATE) */
 
 static void mips_cp0_period_set(MIPSCPU *cpu)
 {
     CPUMIPSState *env = &cpu->env;
 
-    env->cp0_count_ns = TIMER_PERIOD_DEFAULT;
+    env->cp0_count_ns = muldiv64(NANOSECONDS_PER_SECOND, CP0_COUNT_RATE_DEFAULT,
+                                 CPU_FREQ_HZ_DEFAULT);
 }
 
 static void mips_cpu_realizefn(DeviceState *dev, Error **errp)