9 unstable releases (3 breaking)
0.4.1 | Oct 10, 2024 |
---|---|
0.4.0 | Aug 27, 2024 |
0.3.3 | Aug 9, 2024 |
0.3.1 | Jul 31, 2024 |
0.1.2 | Jul 17, 2024 |
#173 in Hardware support
2,204 downloads per month
58KB
1K
SLoC
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 thePagingMetaData
trait.PTE
: The architecture-dependent page table entry, requires to implement theGenericPTE
trait.H
: OS-functions such as physical memory allocation, requires to implement thePagingHandler
trait.
Currently supported architectures and page table structures:
- x86:
x86_64::X64PageTable
- ARM:
aarch64::A64PageTable
- RISC-V:
riscv::Sv39PageTable
,riscv::Sv48PageTable
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)));
Dependencies
~3.5MB
~32K SLoC