DragonOS-Community/DragonOS
4
1
Fork 0
mirror of https://github.com/DragonOS-Community/DragonOS.git synced 2025-06-22 15:23:23 +00:00
Code Issues Releases Wiki Activity

🆕 double buffer

Browse Source
This commit is contained in:
fslongjin
2022-05-20 19:37:26 +08:00
parent 59e847294a
commit 464837eb1a
11 changed files with 168 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
kernel/driver/timers/HPET/HPET.c
View File

@ -146,11 +146,21 @@ int HPET_init()
// 使用I/O APIC 的IRQ2接收hpet定时器0的中断
apic_make_rte_entry(&entry, 34, IO_APIC_FIXED, DEST_PHYSICAL, IDLE, POLARITY_HIGH, IRR_RESET, EDGE_TRIGGER, MASKED, 0);
// 计算HPET0间隔多少个时钟周期触发一次中断
uint64_t clks_to_intr = 0.001 * HPET0_INTERVAL * HPET_freq;
if (clks_to_intr <= 0 || clks_to_intr > (HPET_freq * 8))
{
kBUG("HPET0: Numof clocks to generate interrupt is INVALID! value=%lld", clks_to_intr);
while (1)
hlt();
}
*(uint64_t *)(HPET_REG_BASE + MAIN_CNT) = 0;
io_mfence();
*(uint64_t *)(HPET_REG_BASE + TIM0_CONF) = 0x004c; // 设置定时器0为周期定时，边沿触发，投递到IO APIC的2号引脚（这里有点绕，写的是8259的引脚号，但是因为禁用了8259，因此会被路由到IO APIC的2号引脚）
io_mfence();
*(uint64_t *)(HPET_REG_BASE + TIM0_COMP) = HPET_freq; // 1s触发一次中断
*(uint64_t *)(HPET_REG_BASE + TIM0_COMP) = clks_to_intr; // 5ms触发一次中断
//*(uint64_t *)(HPET_REG_BASE + TIM0_COMP) = HPET_freq; // 1s触发一次中断
io_mfence();
rtc_get_cmos_time(&rtc_now);