TermiNexus
cc061b2ad3
根因（静态定位，非速度问题）：PS/2 协议里第 2/3 字节是位移“幅值”，符号在第 1 字节的 bit4(X)/bit5(Y)。而驱动把位移按 int8 存储/解释，于是 |位移| ≥ 128 时字节最高位被当成 符号位： - 向右快移（幅值 0x80~0xFF）被读成负数 → _cursor_x 一路减小 → 撞上 if _cursor_x<0 被夹成 0 → 表现为“光标往左飞没了”； - int8 装不下 9 位有符号位移（符号位在 flags 里），结构上必然丢符号。 修改： - drivers/input/mouse/mouse.vp：mouse_packet.dx/dy 与 byte2/byte3 改为 uint8，保存原始 幅值字节，消除 int8 截断；flags（含符号位）照旧保留。 - services/desktop.vp::_update_mouse：按协议用“幅值 + 符号位”重建带符号位移 （命中 flags.bit4/bit5 时幅值 -256），再做屏幕 Y 轴反向。 - USB HID 分支不动：USB 报告的 X/Y 本身即 int8 有符号，原解释正确。
143 lines
3.8 KiB
Plaintext
143 lines
3.8 KiB
Plaintext
import asm
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import intr.idt as idt
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import platform.pch.pic as pic
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import drivers.serial.uart.serial as serial
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import t, c
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define MOUSE_DATA = 0x60
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define MOUSE_STATUS = 0x64
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define MOUSE_COMMAND = 0x64
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define MOUSE_BUF_SIZE = 1024
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define MOUSE_LEFT = 0x01
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define MOUSE_RIGHT = 0x02
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define MOUSE_MIDDLE = 0x04
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class mouse_packet:
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flags: uint8
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dx: uint8 # 原始幅值字节（符号在 flags.bit4）
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dy: uint8 # 原始幅值字节（符号在 flags.bit5）
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buttons: uint8
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packets: [MOUSE_BUF_SIZE]mouse_packet
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pack_head: static uint32 = 0
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pack_tail: static uint32 = 0
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pack_count: static uint32 = 0
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mse_irq_cnt: static uint64 = 0
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cycle: static uint8 = 0
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byte1: static uint8 = 0
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byte2: static uint8 = 0
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byte3: static uint8 = 0
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mouse_x: static int32 = 0
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mouse_y: static int32 = 0
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mouse_buttons: static uint8 = 0
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def _wait_read():
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timeout: uint32 = 100000
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for _ in range(timeout, 0, -1):
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if (asm.inb(MOUSE_STATUS) & 0x01) != 0: return
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def _wait_write():
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timeout: uint32 = 100000
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for _ in range(timeout, 0, -1):
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if (asm.inb(MOUSE_STATUS) & 0x02) == 0: return
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def _write_cmd(cmd: uint8):
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_wait_write()
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asm.outb(MOUSE_COMMAND, 0xD4)
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_wait_write()
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asm.outb(MOUSE_DATA, cmd)
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_wait_read()
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asm.inb(MOUSE_DATA)
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def irq_handler() -> int:
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global cycle, byte1, byte2, byte3, pack_tail, pack_count, mse_irq_cnt
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mse_irq_cnt += 1
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status: uint8 = asm.inb(MOUSE_STATUS)
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if (status & 0x20) == 0: return 0
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data: uint8 = asm.inb(MOUSE_DATA)
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if cycle == 0:
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if (data & 0x08) != 0:
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byte1 = data
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cycle = 1
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return 0
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if cycle == 1:
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byte2 = data
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cycle = 2
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return 0
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byte3 = data
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cycle = 0
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# 丢弃带溢出位的包（bit6/bit7 = X/Y overflow）：此时设备给的是饱和值，
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# 直接采用会产生 ±127 级跳变（表现为光标“飞”）。
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if (byte1 & 0xC0) != 0:
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return 0
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if pack_count < MOUSE_BUF_SIZE:
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packets[pack_tail].flags = byte1
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packets[pack_tail].dx = byte2
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packets[pack_tail].dy = byte3
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packets[pack_tail].buttons = byte1 & uint8(0x07)
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pack_tail = pack_tail + 1
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if pack_tail >= MOUSE_BUF_SIZE:
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pack_tail = 0
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pack_count += 1
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return 0
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def read_packet(out: mouse_packet*) -> int:
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global pack_head, pack_count
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asm.cli()
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if pack_count == 0:
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asm.sti()
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out.flags = 0
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out.dx = 0
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out.dy = 0
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out.buttons = 0
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return -1
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out.flags = packets[pack_head].flags
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out.dx = packets[pack_head].dx
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out.dy = packets[pack_head].dy
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out.buttons = packets[pack_head].buttons
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pack_head = pack_head + 1
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if pack_head >= MOUSE_BUF_SIZE:
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pack_head = 0
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pack_count -= 1
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asm.sti()
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return 0
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def has_data() -> int:
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return pack_count
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def get_x() -> int32:
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return mouse_x
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def get_y() -> int32:
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return mouse_y
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def get_buttons() -> uint8:
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return mouse_buttons
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def init():
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_wait_write()
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asm.outb(MOUSE_COMMAND, 0xA8)
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_wait_write()
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asm.outb(MOUSE_COMMAND, 0x20)
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_wait_read()
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status: uint8 = asm.inb(MOUSE_DATA)
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status = status | 0x02
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status = status & 0xDF
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_wait_write()
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asm.outb(MOUSE_COMMAND, 0x60)
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_wait_write()
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asm.outb(MOUSE_DATA, status)
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_write_cmd(0xF6)
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# 分辨率设为 8 counts/mm：0xF6(Set Defaults) 会把它重置为最粗的 4 counts/mm，
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# 于是每个计数对应的位移偏大。设细一档后光标更稳、不易“飞”。
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_write_cmd(0xE8)
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_write_cmd(0x03)
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_write_cmd(0xF4)
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pic.clearMask(12)
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idt.irqInstallHandler(12, irq_handler, "mouse")
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