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72 lines
2.7 KiB
Rust
72 lines
2.7 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 Unit.
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use super::map as memory_map;
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use crate::memory::mmu::*;
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use core::ops::RangeInclusive;
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//--------------------------------------------------------------------------------------------------
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// Public Definitions
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//--------------------------------------------------------------------------------------------------
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/// The kernel's address space defined by this BSP.
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pub type KernelAddrSpace = AddressSpace<{ memory_map::END_INCLUSIVE + 1 }>;
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const NUM_MEM_RANGES: usize = 2;
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/// The virtual memory layout.
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///
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/// The layout must contain only special ranges, aka anything that is _not_ normal cacheable DRAM.
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/// It is agnostic of the paging granularity that the architecture's MMU will use.
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pub static LAYOUT: KernelVirtualLayout<NUM_MEM_RANGES> = KernelVirtualLayout::new(
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memory_map::END_INCLUSIVE,
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[
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TranslationDescriptor {
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name: "Kernel code and RO data",
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virtual_range: rx_range_inclusive,
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physical_range_translation: Translation::Identity,
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attribute_fields: AttributeFields {
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mem_attributes: MemAttributes::CacheableDRAM,
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acc_perms: AccessPermissions::ReadOnly,
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execute_never: false,
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},
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},
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TranslationDescriptor {
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name: "Device MMIO",
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virtual_range: mmio_range_inclusive,
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physical_range_translation: Translation::Identity,
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attribute_fields: AttributeFields {
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mem_attributes: MemAttributes::Device,
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acc_perms: AccessPermissions::ReadWrite,
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execute_never: true,
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},
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},
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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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fn rx_range_inclusive() -> RangeInclusive<usize> {
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// Notice the subtraction to turn the exclusive end into an inclusive end.
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#[allow(clippy::range_minus_one)]
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RangeInclusive::new(super::rx_start(), super::rx_end_exclusive() - 1)
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}
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fn mmio_range_inclusive() -> RangeInclusive<usize> {
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RangeInclusive::new(memory_map::mmio::START, memory_map::mmio::END_INCLUSIVE)
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}
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//--------------------------------------------------------------------------------------------------
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// Public Code
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//--------------------------------------------------------------------------------------------------
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/// Return a reference to the virtual memory layout.
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pub fn virt_mem_layout() -> &'static KernelVirtualLayout<NUM_MEM_RANGES> {
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&LAYOUT
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}
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