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Merge pull request #4 from 0xAX/master

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Dongliang Mu 2016-10-27 19:16:19 -04:00 committed by GitHub
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Booting/linux-bootstrap-4.md
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@ -294,7 +294,7 @@ If the value of the `eax` register is zero, everything is ok and we are able to
Calculate relocation address
--------------------------------------------------------------------------------
The next step is calculating relocation address for decompression if needed. First we need to know what it means for a kernel to be `relocatable`. We already know that the base address of the 32-bit entry point of the Linux kernel is `0x100000`, but that is a 32-bit entry point. The default base address of the Linux kernel is determined by the value of the `CONFIG_PHYSICAL_START` kernel configuration option. Its default value is `0x1000000` or `1 MB`. The main problem here is that if the Linux kernel crashes, a kernel developer must have a `rescue kernel` for [kdump](https://www.kernel.org/doc/Documentation/kdump/kdump.txt) which is configured to load from a different address. The Linux kernel provides special configuration option to solve this problem: `CONFIG_RELOCATABLE`. As we can read in the documentation of the Linux kernel:
The next step is calculating relocation address for decompression if needed. First we need to know what it means for a kernel to be `relocatable`. We already know that the base address of the 32-bit entry point of the Linux kernel is `0x100000`, but that is a 32-bit entry point. The default base address of the Linux kernel is determined by the value of the `CONFIG_PHYSICAL_START` kernel configuration option. Its default value is `0x1000000` or `16 MB`. The main problem here is that if the Linux kernel crashes, a kernel developer must have a `rescue kernel` for [kdump](https://www.kernel.org/doc/Documentation/kdump/kdump.txt) which is configured to load from a different address. The Linux kernel provides special configuration option to solve this problem: `CONFIG_RELOCATABLE`. As we can read in the documentation of the Linux kernel:
```
This builds a kernel image that retains relocation information

2
contributors.md
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@ -97,3 +97,5 @@ Thank you to all contributors:
* [Alex Gonzalez](https://github.com/alex-gonz)
* [Tim Konick](https://github.com/tijko)
* [Anastas Stoyanovsky](https://github.com/anastasds)
* [Faiz Halde](https://github.com/7coder7)