Unverified50% confidenceFactExact time
现代操作系统将代码运行空间分为内核态和用户态，内核态代码拥有访问硬件和内存的最高权限
1
Sources
50%
Confidence
Long-term
Relevance
8/20/2026
First Seen
Sources
Related Claims
UnverifiedIn a DOS environment, programs run in the CPU's real mode, using 16-bit registers and a segmented memory model with an addressable space of only 1 MB67% similarUnverifiedWindows' WDDM VRAM management reserves approximately 500 MB to 1.5 GB of VRAM for the desktop compositor, while using the NVIDIA kernel-mode driver directly on Linux can free up an additional 1–2 GB of VRAM64% similar
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