TermiNexus
e41701e201
explorer 直接写 framebuffer 会与显示器扫描并发，造成撕裂/闪烁；而它在 Ring3 没有 IO 端口权限，不能像历史内核桌面那样自己 inb 0x3DA。所以在 /dev/fb0 上加 FB_WAIT_VBLANK（0x4601）由内核代等垂直回扫（带超时，无 VGA 时序时不死等），vpsdk 暴露 fb_wait_vblank()，desk_server.render() 写屏前调用一次。
94 lines
3.5 KiB
Plaintext
94 lines
3.5 KiB
Plaintext
import vpsdk.devfs as devfs
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import vpsdk.desk as desk
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import vpsdk.process as process
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from stdint import *
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import viperlib
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import desk_server
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def _dbg(msg: const str):
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# S4：改走 /dev/serial0（SERIAL_PUTS 私有 syscall 已删除）
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devfs.serial_puts(msg)
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@__attribute__(section(".text.startup"), aligned(16))
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export def _start() -> int:
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_dbg("[explorer] start\n")
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# 1) 打开 framebuffer 设备，问几何，再映射成线性地址
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fb_fd: int = devfs.fb_open()
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if fb_fd < 0:
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_dbg("[explorer] open /dev/fb0 FAILED\n")
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process.exit(1)
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return 0
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# fb_get_info 改为出参 + 返回码：必须判返回码，否则拿到的是"未写入的残留"
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# （旧写法按值返回 FbInfo，只见前 16 字节有效 ⇒ size/phys 打出垃圾）。
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info: devfs.FbInfo
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_fb_ret: int = devfs.fb_get_info(fb_fd, &info)
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if _fb_ret != 0:
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_dbg("[explorer] FB_GET_INFO FAILED\n")
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process.exit(1)
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return 0
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buf: [160]char
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viperlib.snprintf(&buf, 160,
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"[explorer] fb %ux%u pitch=%u fmt=%u size=%lu phys=0x%lx\n",
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info.width, info.height, info.pitch, info.format, info.size, info.phys)
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_dbg(&buf)
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if info.pitch == 0 or info.size == 0:
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# 几何为 0 ⇒ 内核侧登记/回填没成功（例如注册时传进去的 width/height 是 0）。
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# 继续走只会以 pitch=0 画崩，这里 fail-fast 并把原因说清楚。
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_dbg("[explorer] fb geometry invalid (pitch/size=0)\n")
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process.exit(1)
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return 0
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fb_va: uint64 = devfs.fb_map(fb_fd, info.size)
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if fb_va == 0:
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_dbg("[explorer] mmap /dev/fb0 FAILED\n")
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process.exit(1)
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return 0
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buf2: [96]char
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viperlib.snprintf(&buf2, 96, "[explorer] fb mapped at 0x%lx\n", fb_va)
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_dbg(&buf2)
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# 2) 屏幕几何/映射地址已打印（上面两行），像素通路由此验证；真正的绘制在服务端。
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fb: uint32* = uint32*(fb_va)
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# 4) 输入设备可达性：能 open 到就说明 /dev/* 通路已打通
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# （真正读事件、接管窗口合成放到 S3 —— 内核桌面此刻还在抢同一个 PS/2 口）。
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kfd: int = devfs.kbd_open()
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mfd: int = devfs.mouse_open()
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buf3: [96]char
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viperlib.snprintf(&buf3, 96, "[explorer] input: kbd=%d mouse=%d\n", kfd, mfd)
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_dbg(&buf3)
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# 5) 挂上 /dev/desk 共享区并格式化 —— explorer 是图形壳，共享区由它初始化，
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# app 侧只 desk_ready() 校验。这里先把头打出来证明 IPC 底座可用。
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desk_fd: int = desk.desk_open()
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if desk_fd < 0:
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_dbg("[explorer] open /dev/desk FAILED\n")
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process.exit(1)
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return 0
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shm: uint64 = desk.desk_map(desk_fd)
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if shm == 0:
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_dbg("[explorer] mmap /dev/desk FAILED\n")
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process.exit(1)
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return 0
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desk.desk_format(shm, info.width, info.height, info.pitch)
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hdr: desk.DeskHeader* = desk.DeskHeader*(shm + desk.desk_header_off())
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buf4: [144]char
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viperlib.snprintf(&buf4, 144,
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"[explorer] desk shm=0x%lx ready=%d slot=%lu arena=%u\n",
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shm, hdr.ready, uint64(desk.desk_slot_size()), hdr.arena_off)
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_dbg(&buf4)
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# 6) 进入窗口服务端主循环（永不返回）：请求环 + 输入 + 合成。
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srv: desk_server.DeskServer = desk_server.DeskServer()
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srv.init(fb, int(info.width), int(info.height), int(info.pitch), info.format, shm, kfd, mfd, fb_fd)
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_dbg("[explorer] desk server running\n")
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srv.serve()
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return 0
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