TermiNexus
471cfa16bf
中断仍不送达 timer_handler（无 H）。读 PIT 计数器（latch+读 0x40）打印： - 计数在 1~1193 之间变化 → PIT 正常，问题在中断送达（PIC/APIC/IDT） - 计数为 0/不变 → PIT 本身没跑（outb 未生效/环境问题） 用后移除。
130 lines
4.4 KiB
Plaintext
130 lines
4.4 KiB
Plaintext
import platform.pch.pic as pic
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import platform.pch.pit as pit
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import sched.sched as sched
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import drivers.core.cpu.apic as apic
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import drivers.serial.uart.serial as serial
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import viperlib
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import asm
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import t, c
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TIMER_FREQUENCY: t.CDefine = 1000
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TICKS_PER_SECOND: t.CDefine = TIMER_FREQUENCY
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MILLISECONDS_PER_TICK: t.CDefine = (1000 / TIMER_FREQUENCY)
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ticks: t.CStatic | t.CVolatile | t.CUInt64T = 0
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seconds: t.CStatic | t.CVolatile | t.CUInt32T = 0
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milliseconds: t.CStatic | t.CVolatile | t.CUInt32T = 0
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timer_running: t.CStatic | t.CVolatile | bool = False
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_dbg_once: t.CInt = 0
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def timer_init():
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global ticks, seconds, milliseconds, timer_running
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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ticks = 0
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seconds = 0
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milliseconds = 0
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timer_running = True
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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pit.pit_init(TIMER_FREQUENCY)
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# [DBG] 读 PIT 计数器验证是否在走（用后移除）
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asm.outb(0x43, 0x00) # latch channel 0
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_lo: t.CUInt8T = asm.inb(0x40)
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_hi: t.CUInt8T = asm.inb(0x40)
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_cnt: t.CInt = t.CInt(_lo) | (t.CInt(_hi) << 8)
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_cb: t.CArray[t.CChar, 40]
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viperlib.snprintf(c.Addr(_cb), 40, "[PIT] cnt=%d\n", _cnt)
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serial.puts(c.Addr(_cb))
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def timer_handler():
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global ticks, seconds, milliseconds, timer_running, _dbg_once
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# [DBG] 一次性打印：'H' 出现说明定时 ISR 被调用（用后移除）
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if _dbg_once == 0:
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_dbg_once = 1
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serial.puts("H")
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if not timer_running:
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pic.eoi(0)
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apic.eoi()
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return
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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ticks = ticks + 1
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milliseconds = milliseconds + MILLISECONDS_PER_TICK
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if milliseconds >= 1000:
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seconds = seconds + 1
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milliseconds = milliseconds - 1000
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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sched.Scheduler.sched_tick()
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pic.eoi(0)
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# LAPIC EOI：APIC 启用后中断经 LINT0(EXTINT) 送达会置 LAPIC ISR，
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# 只发 PIC EOI 不清 LAPIC ISR → 首个定时中断后后续中断被屏蔽 →
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# ticks 不推进 → msleep 永久挂起（QEMU/OVMF 下 APIC 必启用）。
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apic.eoi()
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def timer_start():
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global timer_running
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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timer_running = True
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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def timer_stop():
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global timer_running
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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timer_running = False
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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def timer_reset():
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global ticks, seconds, milliseconds
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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ticks = 0
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seconds = 0
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milliseconds = 0
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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def timer_get_ticks() -> t.CUInt64T:
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current_ticks: t.CUInt64T
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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current_ticks = ticks
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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return current_ticks
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def timer_get_seconds() -> t.CUInt32T:
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current_seconds: t.CUInt32T
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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current_seconds = seconds
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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return current_seconds
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def timer_get_milliseconds() -> t.CUInt32T:
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current_milliseconds: t.CUInt32T
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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current_milliseconds = milliseconds
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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return current_milliseconds
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def timer_get_time(out_seconds: t.CUInt32T | t.CPtr, out_milliseconds: t.CUInt32T | t.CPtr):
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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if out_seconds:
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c.Set(c.Deref(out_seconds), seconds)
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if out_milliseconds:
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c.Set(c.Deref(out_milliseconds), milliseconds)
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c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
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def timer_msleep(ms: t.CUInt32T):
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target: t.CUInt64T = ticks + (ms + MILLISECONDS_PER_TICK - 1) / MILLISECONDS_PER_TICK
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_spin: t.CUInt64T = 0
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while ticks < target:
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# [DBG] 自旋计数：每 1M 次迭代打印 s——hlt 能唤醒说明中断触发
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# （用后移除）
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_spin += 1
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if (_spin & 0xFFFFF) == 0:
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serial.puts("s")
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asm.sti()
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asm.hlt()
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sched.Scheduler._yield()
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def timer_sleep(sec: t.CUInt32T):
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target: t.CUInt64T = ticks + sec * TICKS_PER_SECOND
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while ticks < target:
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asm.sti()
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asm.hlt()
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sched.Scheduler._yield()
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