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Code Issues Releases Wiki Activity

🆕 测定tsc频率

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This commit is contained in:
fslongjin
2022-07-27 21:05:33 +08:00
parent 72b67ddf1c
commit 4bc64de8f9
7 changed files with 57 additions and 32 deletions
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25
kernel/driver/timers/HPET/HPET.c
View File

@ -18,7 +18,13 @@ static uint32_t HPET_COUNTER_CLK_PERIOD = 0; // 主计数器时间精度（单
static double HPET_freq = 0; // 主计时器频率
static uint8_t HPET_NUM_TIM_CAP = 0; // 定时器数量
static char measure_apic_timer_flag; // 初始化apic时钟时所用到的标志变量
extern struct rtc_time_t rtc_now; // 导出全局墙上时钟
// 测定tsc频率的临时变量
static uint64_t test_tsc_start = 0;
static uint64_t test_tsc_end = 0;
extern uint64_t Cpu_tsc_freq; // 导出自cpu.c
extern struct rtc_time_t rtc_now; // 导出全局墙上时钟
enum
{
@ -91,11 +97,12 @@ void HPET_handler(uint64_t number, uint64_t param, struct pt_regs *regs)
}
/**
* @brief 测量apic定时器频率的中断回调函数
* @brief 测定apic定时器以及tsc的频率的中断回调函数
*
*/
void HPET_measure_apic_timer_handler(uint64_t number, uint64_t param, struct pt_regs *regs)
void HPET_measure_handler(uint64_t number, uint64_t param, struct pt_regs *regs)
{
test_tsc_end = rdtsc();
// 停止apic定时器
// 写入每1ms的ticks
apic_timer_stop();
@ -104,10 +111,10 @@ void HPET_measure_apic_timer_handler(uint64_t number, uint64_t param, struct pt_
}
/**
* @brief 测定apic定时器的频率
* @brief 测定apic定时器以及tsc的频率
*
*/
void HPET_measure_apic_timer_freq()
void HPET_measure_freq()
{
kinfo("Measuring local APIC timer's frequency...");
const uint64_t interval = APIC_TIMER_INTERVAL; // 测量给定时间内的计数
@ -136,7 +143,7 @@ void HPET_measure_apic_timer_freq()
measure_apic_timer_flag = false;
// 注册中断
irq_register(34, &entry, &HPET_measure_apic_timer_handler, 0, &HPET_intr_controller, "HPET0 measure");
irq_register(34, &entry, &HPET_measure_handler, 0, &HPET_intr_controller, "HPET0 measure");
// 设置div16
apic_timer_stop();
@ -148,6 +155,8 @@ void HPET_measure_apic_timer_freq()
// 启动apic定时器
apic_timer_set_LVT(151, 0, APIC_LVT_Timer_One_Shot);
*(uint64_t *)(HPET_REG_BASE + GEN_CONF) = 3; // 置位旧设备中断路由兼容标志位、定时器组使能标志位，开始计时
// 顺便测定tsc频率
test_tsc_start = rdtsc();
io_mfence();
while (measure_apic_timer_flag == false)
@ -158,6 +167,10 @@ void HPET_measure_apic_timer_freq()
*(uint64_t *)(HPET_REG_BASE + GEN_CONF) = 0; // 停用HPET定时器
io_mfence();
kinfo("Local APIC timer's freq: %d ticks/ms.", apic_timer_ticks_result);
// 计算tsc频率
Cpu_tsc_freq = (test_tsc_end - test_tsc_start) * (1000UL / interval);
kinfo("TSC frequency: %ldMHz", Cpu_tsc_freq / 1000000);
}
/**

4
kernel/driver/timers/HPET/HPET.h
View File

@ -10,10 +10,10 @@
int HPET_init();
/**
* @brief 测定apic定时器的频率
* @brief 测定apic定时器以及tsc的频率
*
*/
void HPET_measure_apic_timer_freq();
void HPET_measure_freq();
/**
* @brief 启用HPET周期中断（5ms）