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Move posts about red zone and disabling SIMD in second post folder

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They are strongly related to the second post.
This commit is contained in:
Philipp Oppermann
2020-01-28 16:57:00 +01:00
parent 0c67111e68
commit 007bf8a937
5 changed files with 4 additions and 4 deletions
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2
blog/content/second-edition/extra/disable-red-zone/index.md → blog/content/second-edition/posts/02-minimal-rust-kernel/disable-red-zone/index.md
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title = "Disable the Red Zone"
weight = 1
path = "red-zone"
template = "second-edition/extra.html"
+++
The [red zone] is an optimization of the [System V ABI] that allows functions to temporarily use the 128 bytes below its stack frame without adjusting the stack pointer:

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blog/content/second-edition/extra/disable-red-zone/red-zone-overwrite.svg → blog/content/second-edition/posts/02-minimal-rust-kernel/disable-red-zone/red-zone-overwrite.svg
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blog/content/second-edition/extra/disable-red-zone/red-zone.svg → blog/content/second-edition/posts/02-minimal-rust-kernel/disable-red-zone/red-zone.svg
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blog/content/second-edition/extra/disable-simd/index.md → blog/content/second-edition/posts/02-minimal-rust-kernel/disable-simd/index.md
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title = "Disable SIMD"
weight = 2
path = "disable-simd"
template = "second-edition/extra.html"
+++
[Single Instruction Multiple Data (SIMD)] instructions are able to perform an operation (e.g. addition) simultaneously on multiple data words, which can speed up programs significantly. The `x86_64` architecture supports various SIMD standards:

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blog/content/second-edition/posts/02-minimal-rust-kernel/index.md
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@@ -169,7 +169,7 @@ This setting specifies that the target doesn't support [stack unwinding] on pani
We're writing a kernel, so we'll need to handle interrupts at some point. To do that safely, we have to disable a certain stack pointer optimization called the _“red zone”_, because it would cause stack corruptions otherwise. For more information, see our separate post about [disabling the red zone].
[disabling the red zone]: @/second-edition/extra/disable-red-zone/index.md
[disabling the red zone]: @/second-edition/posts/02-minimal-rust-kernel/disable-red-zone/index.md
```json
"features": "-mmx,-sse,+soft-float",
@@ -183,7 +183,7 @@ The `mmx` and `sse` features determine support for [Single Instruction Multiple
A problem with disabling SIMD is that floating point operations on `x86_64` require SIMD registers by default. To solve this problem, we add the `soft-float` feature, which emulates all floating point operations through software functions based on normal integers.
For more information, see our post on [disabling SIMD](@/second-edition/extra/disable-simd/index.md).
For more information, see our post on [disabling SIMD](@/second-edition/posts/02-minimal-rust-kernel/disable-simd/index.md).
#### Putting it Together
Our target specification file now looks like this: