mirror of https://github.com/m-labs/artiq.git
42 lines
974 B
Rust
42 lines
974 B
Rust
use irq;
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pub unsafe fn reboot() -> ! {
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irq::set_ie(false);
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#[cfg(target_arch="or1k")]
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asm!(r#"
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l.j _reset_handler
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l.nop
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"# : : : : "volatile");
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loop {}
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}
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pub unsafe fn hotswap(new_code: &[u8]) -> ! {
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irq::set_ie(false);
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#[cfg(target_arch="or1k")]
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asm!(r#"
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# This loop overwrites itself, but it's structured in such a way
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# that before that happens, it loads itself into I$$ fully.
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l.movhi r4, hi(_reset_handler)
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l.ori r4, r4, lo(_reset_handler)
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l.or r7, r4, r0
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0: l.sfnei r5, 0
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l.bf 1f
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l.nop
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l.jr r7
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l.nop
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1: l.lwz r6, 0(r3)
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l.sw 0(r4), r6
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l.addi r3, r3, 4
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l.addi r4, r4, 4
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l.addi r5, r5, -4
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l.bf 0b
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l.nop
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"#
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:
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: "{r3}"(new_code.as_ptr() as usize),
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"{r5}"(new_code.len())
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:
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: "volatile");
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loop {}
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}
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