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Merge pull request #756 from Mutated1994/patch-5

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feat: Add a important word
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Sebastian Fricke 2020-11-24 13:45:12 +01:00 committed by GitHub
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Booting/linux-bootstrap-1.md
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@ -64,7 +64,7 @@ which is `65520` bytes past the first megabyte. Since only one megabyte is acces
Ok, now we know a little bit about real mode and its memory addressing. Let's get back to discussing register values after reset.
The `CS` register consists of two parts: the visible segment selector and the hidden base address. While the base address is normally formed by multiplying the segment selector value by 16, during a hardware reset the segment selector in the CS register is loaded with `0xf000` and the base address is loaded with `0xffff0000`. The processor uses this special base address until `CS` changes.
The `CS` register consists of two parts: the visible segment selector and the hidden base address. In real-address mode, the base address is normally formed by shifting the 16-bit segment selector value 4 bits to the left to produce a 20-bit base address. However, during a hardware reset the segment selector in the CS register is loaded with `0xf000` and the base address is loaded with `0xffff0000`. The processor uses this special base address until `CS` changes.
The starting address is formed by adding the base address to the value in the EIP register: