TermiNexus
9082056fe0
APIC 启用后（LINT0=EXTINT 送达），每次中断会置 LAPIC ISR，必须写 LAPIC_EOI(0x0B0) 清除。此前只发 PIC EOI(0x20/0xA0)，LAPIC ISR 卡住 → 首个定时中断后后续中断全被屏蔽 → ticks 不推进 → timer_msleep 永久挂起 （清理诊断后稳定复现，serial.log 停在 "sti done" 无 "msleep done"）。 两个分支（timer_running 早退 + 正常路径）都补 apic.eoi()。
109 lines
3.5 KiB
Plaintext
109 lines
3.5 KiB
Plaintext
import platform.pch.pic as pic
|
||
import platform.pch.pit as pit
|
||
import sched.sched as sched
|
||
import drivers.core.cpu.apic as apic
|
||
import asm
|
||
import t, c
|
||
|
||
TIMER_FREQUENCY: t.CDefine = 1000
|
||
TICKS_PER_SECOND: t.CDefine = TIMER_FREQUENCY
|
||
MILLISECONDS_PER_TICK: t.CDefine = (1000 / TIMER_FREQUENCY)
|
||
|
||
ticks: t.CStatic | t.CVolatile | t.CUInt64T = 0
|
||
seconds: t.CStatic | t.CVolatile | t.CUInt32T = 0
|
||
milliseconds: t.CStatic | t.CVolatile | t.CUInt32T = 0
|
||
timer_running: t.CStatic | t.CVolatile | bool = False
|
||
|
||
def timer_init():
|
||
global ticks, seconds, milliseconds, timer_running
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
ticks = 0
|
||
seconds = 0
|
||
milliseconds = 0
|
||
timer_running = True
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
pit.pit_init(TIMER_FREQUENCY)
|
||
|
||
def timer_handler():
|
||
global ticks, seconds, milliseconds, timer_running
|
||
if not timer_running:
|
||
pic.eoi(0)
|
||
apic.eoi()
|
||
return
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
ticks = ticks + 1
|
||
milliseconds = milliseconds + MILLISECONDS_PER_TICK
|
||
if milliseconds >= 1000:
|
||
seconds = seconds + 1
|
||
milliseconds = milliseconds - 1000
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
sched.Scheduler.sched_tick()
|
||
pic.eoi(0)
|
||
# LAPIC EOI：APIC 启用后中断经 LINT0(EXTINT) 送达会置 LAPIC ISR，
|
||
# 只发 PIC EOI 不清 LAPIC ISR → 首个定时中断后后续中断被屏蔽 →
|
||
# ticks 不推进 → msleep 永久挂起（QEMU/OVMF 下 APIC 必启用）。
|
||
apic.eoi()
|
||
|
||
def timer_start():
|
||
global timer_running
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
timer_running = True
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
|
||
def timer_stop():
|
||
global timer_running
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
timer_running = False
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
|
||
def timer_reset():
|
||
global ticks, seconds, milliseconds
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
ticks = 0
|
||
seconds = 0
|
||
milliseconds = 0
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
|
||
def timer_get_ticks() -> t.CUInt64T:
|
||
current_ticks: t.CUInt64T
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
current_ticks = ticks
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
return current_ticks
|
||
|
||
def timer_get_seconds() -> t.CUInt32T:
|
||
current_seconds: t.CUInt32T
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
current_seconds = seconds
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
return current_seconds
|
||
|
||
def timer_get_milliseconds() -> t.CUInt32T:
|
||
current_milliseconds: t.CUInt32T
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
current_milliseconds = milliseconds
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
return current_milliseconds
|
||
|
||
def timer_get_time(out_seconds: t.CUInt32T | t.CPtr, out_milliseconds: t.CUInt32T | t.CPtr):
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
if out_seconds:
|
||
c.Set(c.Deref(out_seconds), seconds)
|
||
if out_milliseconds:
|
||
c.Set(c.Deref(out_milliseconds), milliseconds)
|
||
c.Asm("mfence", op=[t.ASM_DESCR.CLOBBER_MEMORY])
|
||
|
||
def timer_msleep(ms: t.CUInt32T):
|
||
target: t.CUInt64T = ticks + (ms + MILLISECONDS_PER_TICK - 1) / MILLISECONDS_PER_TICK
|
||
while ticks < target:
|
||
asm.sti()
|
||
asm.hlt()
|
||
sched.Scheduler._yield()
|
||
|
||
def timer_sleep(sec: t.CUInt32T):
|
||
target: t.CUInt64T = ticks + sec * TICKS_PER_SECOND
|
||
while ticks < target:
|
||
asm.sti()
|
||
asm.hlt()
|
||
sched.Scheduler._yield()
|