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71 lines
2.2 KiB
Rust
71 lines
2.2 KiB
Rust
// SPDX-License-Identifier: MIT OR Apache-2.0
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//
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// Copyright (c) 2018-2020 Andre Richter <andre.o.richter@gmail.com>
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//! BSP Memory Management.
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use core::ops::Range;
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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 "C" {
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static __bss_start: usize;
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static __bss_end: usize;
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}
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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/// The early boot core's stack address.
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pub const BOOT_CORE_STACK_START: usize = 0x80_000;
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/// The board's 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 BASE: usize = 0x3F00_0000;
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pub const GPIO_BASE: usize = BASE + GPIO_OFFSET;
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pub const PL011_UART_BASE: usize = BASE + 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 BASE: usize = 0xFE00_0000;
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pub const GPIO_BASE: usize = BASE + GPIO_OFFSET;
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pub const PL011_UART_BASE: usize = BASE + UART_OFFSET;
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}
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}
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Return the 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() -> Range<*mut u64> {
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unsafe {
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Range {
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start: &__bss_start as *const _ as *mut u64,
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end: &__bss_end as *const _ as *mut u64,
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}
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}
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}
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