Files
TermiNexus a518f75b24 chore(vkernel): 重置基线 — 纳入 TPV codegen 修复配合的内核侧调整与既有工作区内容
- devfs.vp: string.split 传 PATH_BUFFER_SIZE(配合 split 新增容量参数)

- fat32_types.vp: lfn_extract 越界钳制(base+i > MAX_LFN 返回 -1)

- sheet.vp: gfx.Renderer 实参修正为 (fb, zb, w, h)(原单参导致 w/h=0 渲染空操作)

- 同批包含 VKernel 其余既有移植改动与 vpsdk/Apps/Libs 工作区内容
2026-09-11 14:27:01 +08:00

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import asm
import t, c
# PIC端口定义
PIC1_COMMAND: t.CDefine = 0x20
PIC1_DATA: t.CDefine = 0x21
PIC2_COMMAND: t.CDefine = 0xA0
PIC2_DATA: t.CDefine = 0xA1
# ICW1 - 初始化命令字1
ICW1_ICW4: t.CDefine = 0x01 # 需要ICW4
ICW1_SINGLE: t.CDefine = 0x02 # 单级模式
ICW1_INTERVAL4: t.CDefine = 0x04 # 间隔4字节
ICW1_LEVEL: t.CDefine = 0x08 # 电平触发模式
ICW1_INIT: t.CDefine = 0x10 # 初始化
# ICW4 - 初始化命令字4
ICW4_8086: t.CDefine = 0x01 # 8086/88模式
ICW4_AUTO: t.CDefine = 0x02 # 自动EOI
ICW4_BUF_SLAVE: t.CDefine = 0x08 # 缓冲模式(从片)
ICW4_BUF_MASTER: t.CDefine = 0x0C # 缓冲模式(主片)
ICW4_SFNM: t.CDefine = 0x10 # 特殊全嵌套模式
# OCW2 - 操作命令字2
OCW2_EOI: t.CDefine = 0x20 # 结束中断
# OCW3 - 操作命令字3
OCW3_READ_ISR: t.CDefine = 0x0B # 读取中断服务寄存器(ISR)
# 初始化PIC
def init():
# 发送ICW1:开始初始化,需要ICW4
asm.outb(PIC1_COMMAND, ICW1_INIT | ICW1_ICW4)
asm.io_wait()
asm.outb(PIC2_COMMAND, ICW1_INIT | ICW1_ICW4)
asm.io_wait()
# 发送ICW2:中断向量偏移
asm.outb(PIC1_DATA, 0x20) # IRQ0-7映射到0x20-0x27
asm.io_wait()
asm.outb(PIC2_DATA, 0x28) # IRQ8-15映射到0x28-0x2F
asm.io_wait()
# 发送ICW3:级联信息
asm.outb(PIC1_DATA, 0x04) # 主PIC的IRQ2连接从PIC
asm.io_wait()
asm.outb(PIC2_DATA, 0x02) # 从PIC连接到主PIC的IRQ2
asm.io_wait()
# 发送ICW4:8086模式
asm.outb(PIC1_DATA, ICW4_8086)
asm.io_wait()
asm.outb(PIC2_DATA, ICW4_8086)
asm.io_wait()
# 设置初始屏蔽字:只启用IRQ0(定时器)、IRQ1(键盘)、IRQ2(级联)
# 主PIC: 屏蔽所有除了IRQ0, IRQ1, IRQ2 (0xF8 = 11111000)
# 从PIC: 屏蔽所有 (0xFF = 11111111),鼠标中断由驱动程序自己启用
asm.outb(PIC1_DATA, 0xF8) # 启用IRQ0, IRQ1, IRQ2
asm.io_wait()
asm.outb(PIC2_DATA, 0xFF) # 屏蔽所有从PIC中断
asm.io_wait()
# 发送EOI信号
def eoi(irq: uint8):
if irq >= 8: asm.outb(PIC2_COMMAND, OCW2_EOI)
asm.outb(PIC1_COMMAND, OCW2_EOI)
# 检查是否是虚假中断(spurious interrupt)
# 返回 1 表示是虚假中断,0 表示是真实中断
def isSpurious(irq: int) -> int:
# 边界检查
if irq < 0 or irq > 15: return 0
isr: uint8
if irq < 8:
# 发送OCW3,读取ISR(Interrupt Service Register)
asm.outb(PIC1_COMMAND, OCW3_READ_ISR)
asm.io_wait()
isr = asm.inb(PIC1_COMMAND)
# 如果ISR中对应位为0,说明是虚假中断
return not (isr & (1 << irq))
else:
# 发送OCW3,读取从PIC的ISR
asm.outb(PIC2_COMMAND, OCW3_READ_ISR)
asm.io_wait()
isr = asm.inb(PIC2_COMMAND)
# 如果ISR中对应位为0,说明是虚假中断
return not (isr & (1 << (irq - 8)))
# 设置IRQ屏蔽
def setMask(irq: uint8):
# 边界检查
if irq > 15: return
port: uint16
value: uint8
if irq < 8:
port = PIC1_DATA
else:
port = PIC2_DATA
irq -= 8
value = asm.inb(port) | (1 << irq)
asm.outb(port, value)
asm.io_wait() # 确保命令生效
# 清除IRQ屏蔽
def clearMask(irq: uint8):
# 边界检查
if irq > 15: return
port: uint16
value: uint8
if irq < 8:
port = PIC1_DATA
else:
port = PIC2_DATA
irq -= 8
value = asm.inb(port) & ~(1 << irq)
asm.outb(port, value)
asm.io_wait() # 确保命令生效