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92 lines
2.8 KiB
Rust
92 lines
2.8 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2021 Andre Richter <andre.o.richter@gmail.com>
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//! BSP Memory Management.
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use core::{cell::UnsafeCell, ops::RangeInclusive};
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//--------------------------------------------------------------------------------------------------
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// Private Definitions
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//--------------------------------------------------------------------------------------------------
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// Symbols from the linker script.
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extern "Rust" {
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static __rx_start: UnsafeCell<()>;
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static __bss_start: UnsafeCell<u64>;
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static __bss_end_inclusive: UnsafeCell<u64>;
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}
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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/// The board's physical memory map.
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#[rustfmt::skip]
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pub(super) mod map {
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pub const GPIO_OFFSET: usize = 0x0020_0000;
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pub const UART_OFFSET: usize = 0x0020_1000;
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/// Physical devices.
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#[cfg(feature = "bsp_rpi3")]
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pub mod mmio {
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use super::*;
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pub const START: usize = 0x3F00_0000;
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pub const GPIO_START: usize = START + GPIO_OFFSET;
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pub const PL011_UART_START: usize = START + UART_OFFSET;
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}
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/// Physical devices.
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#[cfg(feature = "bsp_rpi4")]
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pub mod mmio {
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use super::*;
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pub const START: usize = 0xFE00_0000;
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pub const GPIO_START: usize = START + GPIO_OFFSET;
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pub const PL011_UART_START: usize = START + UART_OFFSET;
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}
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}
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//--------------------------------------------------------------------------------------------------
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// Private Code
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//--------------------------------------------------------------------------------------------------
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/// Start address of the Read+Execute (RX) range.
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///
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/// # Safety
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///
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/// - Value is provided by the linker script and must be trusted as-is.
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#[inline(always)]
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fn rx_start() -> usize {
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unsafe { __rx_start.get() as usize }
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}
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Exclusive end address of the boot core's stack.
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#[inline(always)]
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pub fn boot_core_stack_end() -> usize {
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rx_start()
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}
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/// Return the inclusive range spanning the .bss section.
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///
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/// # Safety
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///
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/// - Values are provided by the linker script and must be trusted as-is.
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/// - The linker-provided addresses must be u64 aligned.
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pub fn bss_range_inclusive() -> RangeInclusive<*mut u64> {
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let range;
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unsafe {
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range = RangeInclusive::new(__bss_start.get(), __bss_end_inclusive.get());
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}
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assert!(!range.is_empty());
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range
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}
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