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Update 1-the-basics.mdx
Dec 31, 2023
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Update 1-the-basics.mdx
fcostarodrigo Oct 7, 2024
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2 changes: 1 addition & 1 deletion src/content/chapters/1-the-basics.mdx
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Expand Up @@ -72,7 +72,7 @@ It's time to leap through our first rabbit hole into a land filled with syscalls

## Two Rings to Rule Them All

The *mode* (sometimes called privilege level or ring) a processor is in controls what it's allowed to do. Modern architectures have at least two options: kernel/supervisor mode and user mode. While an architecture might support more than two modes, only kernel mode and user mode are commonly used these days.
The *mode* (sometimes called privilege level or ring) controls what a processor is allowed to do. Modern architectures have at least two options: kernel/supervisor mode and user mode. While an architecture might support more than two modes, only kernel mode and user mode are commonly used these days.

In kernel mode, anything goes: the CPU is allowed to execute any supported instruction and access any memory. In user mode, only a subset of instructions is allowed, I/O and memory access is limited, and many CPU settings are locked. Generally, the kernel and drivers run in kernel mode while applications run in user mode.

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