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Allow hw.acpi.cpu.{economy,performance}_speed to be set from the loader

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via tunables.
This commit is contained in:
John Baldwin 2001-10-23 22:37:36 +00:00
parent d19fc02a22
commit e5e5b51f9f
1 changed files with 9 additions and 0 deletions
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9
sys/dev/acpica/acpi_cpu.c
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@ -255,6 +255,7 @@ acpi_cpu_attach(device_t dev)
static void
acpi_cpu_init_throttling(void *arg)
{
int cpu_temp_speed;
ACPI_LOCK;
@ -267,6 +268,14 @@ acpi_cpu_init_throttling(void *arg)
cpu_economy_state = cpu_performance_state / 2;
if (cpu_economy_state == 0) /* 0 is 'reserved' */
cpu_economy_state++;
if (TUNABLE_INT_FETCH("hw.acpi.cpu.performance_speed",
&cpu_temp_speed) && cpu_temp_speed > 0 &&
cpu_temp_speed <= cpu_max_state)
cpu_performance_state = cpu_temp_speed;
if (TUNABLE_INT_FETCH("hw.acpi.cpu.economy_speed",
&cpu_temp_speed) && cpu_temp_speed > 0 &&
cpu_temp_speed <= cpu_max_state)
cpu_economy_state = cpu_temp_speed;
/* register performance profile change handler */
EVENTHANDLER_REGISTER(powerprofile_change, acpi_cpu_powerprofile, NULL, 0);