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memory.rs
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memory.rs
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// SPDX-License-Identifier: MIT OR Apache-2.0
//
// Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
//! BSP Memory Management.
use core::{cell::UnsafeCell, ops::RangeInclusive};
//--------------------------------------------------------------------------------------------------
// Private Definitions
//--------------------------------------------------------------------------------------------------
// Symbols from the linker script.
extern "Rust" {
static __bss_start: UnsafeCell<u64>;
static __bss_end_inclusive: UnsafeCell<u64>;
}
//--------------------------------------------------------------------------------------------------
// Public Code
//--------------------------------------------------------------------------------------------------
/// Return the inclusive range spanning the .bss section.
///
/// # Safety
///
/// - Values are provided by the linker script and must be trusted as-is.
/// - The linker-provided addresses must be u64 aligned.
pub fn bss_range_inclusive() -> RangeInclusive<*mut u64> {
let range;
unsafe {
range = RangeInclusive::new(__bss_start.get(), __bss_end_inclusive.get());
}
assert!(!range.is_empty());
range
}