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42 lines
1.3 KiB
Rust
42 lines
1.3 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2021 Andre Richter <andre.o.richter@gmail.com>
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//! Architectural boot code.
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//!
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//! # Orientation
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//!
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//! Since arch modules are imported into generic modules using the path attribute, the path of this
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//! file is:
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//!
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//! crate::cpu::boot::arch_boot
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use crate::{bsp, cpu};
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use cortex_a::regs::*;
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// The entry of the `kernel` binary.
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///
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/// The function must be named `_start`, because the linker is looking for this exact name.
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///
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/// # Safety
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///
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/// - Linker script must ensure to place this function where it is expected by the target machine.
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/// - We have to hope that the compiler omits any stack pointer usage before the stack pointer is
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/// actually set (`SP.set()`).
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#[no_mangle]
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pub unsafe fn _start() -> ! {
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use crate::runtime_init;
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if bsp::cpu::BOOT_CORE_ID == cpu::smp::core_id() {
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SP.set(bsp::memory::boot_core_stack_end() as u64);
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runtime_init::runtime_init()
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} else {
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// If not core0, infinitely wait for events.
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cpu::wait_forever()
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}
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}
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