Crate page_table_multiarch 

page_table_multiarch

This crate provides generic, unified, architecture-independent, and OS-free page table structures for various hardware architectures.

The core struct is PageTable64<M, PTE, H>. OS-functions and architecture-dependent types are provided by generic parameters:

• M: The architecture-dependent metadata, requires to implement the PagingMetaData trait.
• PTE: The architecture-dependent page table entry, requires to implement the GenericPTE trait.
• H: OS-functions such as physical memory allocation, requires to implement the PagingHandler trait.

Currently supported architectures and page table structures:

• x86: x86_64::X64PageTable
• ARM: aarch64::A64PageTable
• RISC-V: riscv::Sv39PageTable, riscv::Sv48PageTable
• LoongArch64: loongarch64:LA64PageTable

Examples (x86_64)

use memory_addr::{MemoryAddr, PhysAddr, VirtAddr};
use page_table_multiarch::x86_64::{X64PageTable};
use page_table_multiarch::{MappingFlags, PagingHandler, PageSize};

use core::alloc::Layout;

extern crate alloc;

struct PagingHandlerImpl;

impl PagingHandler for PagingHandlerImpl {
    fn alloc_frame() -> Option<PhysAddr> {
        let layout = Layout::from_size_align(0x1000, 0x1000).unwrap();
        let ptr = unsafe { alloc::alloc::alloc(layout) };
        Some(PhysAddr::from(ptr as usize))
    }

    fn dealloc_frame(paddr: PhysAddr) {
        let layout = Layout::from_size_align(0x1000, 0x1000).unwrap();
        let ptr = paddr.as_usize() as *mut u8;
        unsafe { alloc::alloc::dealloc(ptr, layout) };
    }

    fn phys_to_virt(paddr: PhysAddr) -> VirtAddr {
        VirtAddr::from(paddr.as_usize())
    }
}

let vaddr = VirtAddr::from(0xdead_beef_000);
let paddr = PhysAddr::from(0x2000);
let flags = MappingFlags::READ | MappingFlags::WRITE;
let mut pt = X64PageTable::<PagingHandlerImpl>::try_new().unwrap();

assert!(pt.root_paddr().is_aligned_4k());
assert!(pt.map(vaddr, paddr, PageSize::Size4K, flags).is_ok());
assert_eq!(pt.query(vaddr), Ok((paddr, flags, PageSize::Size4K)));

Re-exports

pub use page_table_entry::GenericPTE;

pub use page_table_entry::MappingFlags;

Modules

aarch64AArch64

AArch64 specific page table structures.

loongarch64LoongArch LA64

LoongArch64 specific page table structures.

riscvRISC-V RV32 or RISC-V RV64

RISC-V specific page table structures.

x86_64x86-64

x86 specific page table structures.

Structs

PageTable64

A generic page table struct for 64-bit platform.

TlbFlush

This type indicates the mapping of a virtual address has been changed.

TlbFlushAll

This type indicates the page table mappings have been changed.

Enums

PageSize

The page sizes supported by the hardware page table.

PagingError

The error type for page table operation failures.

Traits

PagingHandler

The low-level OS-dependent helpers that must be provided for PageTable64.

PagingMetaData

The architecture-dependent metadata that must be provided for PageTable64.

Type Aliases

PagingResult

The specialized Result type for page table operations.