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# Tutorial 02 - Runtime Init
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## tl;dr
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We extend `cpu.S` to call into Rust code for the first time. There,we zero the [bss] section before
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execution is halted with a call to `panic()`. Check out `make qemu` again to see the additional code
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run.
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## Notable additions
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- More sections in linker script:
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- `.rodata`, `.data`
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- `.bss`
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- `_start()`:
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- Halt core if core != `core0`.
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- `core0` jumps to the `runtime_init()` Rust function.
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- `runtime_init()` in `runtime_init.rs`
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- Zeros the `.bss` section.
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- Calls `kernel_init()`, which calls `panic!()`, which eventually halts `core0` as well.
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[bss]: https://en.wikipedia.org/wiki/.bss
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## Diff to previous
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