TermiNexus
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内容由用户产出，本次仅代为提交、未做任何语义修改；含 static 修饰符前置迁移等（新增 static 前缀 16 行）。提交消息为中性描述——如需更精确的说明请 amend。
130 lines
4.3 KiB
Plaintext
130 lines
4.3 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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define TIMER_FREQUENCY = 1000
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define TICKS_PER_SECOND = TIMER_FREQUENCY
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define MILLISECONDS_PER_TICK = (1000 / TIMER_FREQUENCY)
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static ticks: volatile uint64 = 0
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static seconds: volatile uint32 = 0
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static milliseconds: volatile uint32 = 0
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static timer_running: volatile bool = False
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_dbg_once: int = 0
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def timer_init():
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global ticks, seconds, milliseconds, timer_running
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__asm__("mfence", op=[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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__asm__("mfence", op=[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: uint8 = asm.inb(0x40)
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_hi: uint8 = asm.inb(0x40)
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_cnt: int = int(_lo) | (int(_hi) << 8)
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_cb: [40]char
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viperlib.snprintf(&_cb, 40, "[PIT] cnt=%d\n", _cnt)
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serial.puts(&_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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__asm__("mfence", op=[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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__asm__("mfence", op=[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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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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timer_running = True
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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def timer_stop():
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global timer_running
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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timer_running = False
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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def timer_reset():
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global ticks, seconds, milliseconds
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__asm__("mfence", op=[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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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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def timer_get_ticks() -> uint64:
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current_ticks: uint64
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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current_ticks = ticks
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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return current_ticks
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def timer_get_seconds() -> uint32:
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current_seconds: uint32
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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current_seconds = seconds
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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return current_seconds
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def timer_get_milliseconds() -> uint32:
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current_milliseconds: uint32
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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current_milliseconds = milliseconds
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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return current_milliseconds
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def timer_get_time(out_seconds: uint32*, out_milliseconds: uint32*):
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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if out_seconds:
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*out_seconds = seconds
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if out_milliseconds:
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*out_milliseconds = milliseconds
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__asm__("mfence", op=[ASM_DESCR.CLOBBER_MEMORY])
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def timer_msleep(ms: uint32):
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target: uint64 = ticks + (ms + MILLISECONDS_PER_TICK - 1) / MILLISECONDS_PER_TICK
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_spin: uint64 = 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: uint32):
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target: uint64 = 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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