1use axalloc::global_allocator;
4use lazyinit::LazyInit;
5use page_table_multiarch::PagingHandler;
6
7use crate::mem::{MemRegionFlags, PAGE_SIZE_4K, PhysAddr, VirtAddr, phys_to_virt, virt_to_phys};
8
9#[doc(no_inline)]
10pub use page_table_multiarch::{MappingFlags, PageSize, PagingError, PagingResult};
11
12impl From<MemRegionFlags> for MappingFlags {
13 fn from(f: MemRegionFlags) -> Self {
14 let mut ret = Self::empty();
15 if f.contains(MemRegionFlags::READ) {
16 ret |= Self::READ;
17 }
18 if f.contains(MemRegionFlags::WRITE) {
19 ret |= Self::WRITE;
20 }
21 if f.contains(MemRegionFlags::EXECUTE) {
22 ret |= Self::EXECUTE;
23 }
24 if f.contains(MemRegionFlags::DEVICE) {
25 ret |= Self::DEVICE;
26 }
27 if f.contains(MemRegionFlags::UNCACHED) {
28 ret |= Self::UNCACHED;
29 }
30 ret
31 }
32}
33
34pub struct PagingHandlerImpl;
37
38impl PagingHandler for PagingHandlerImpl {
39 fn alloc_frame() -> Option<PhysAddr> {
40 global_allocator()
41 .alloc_pages(1, PAGE_SIZE_4K)
42 .map(|vaddr| virt_to_phys(vaddr.into()))
43 .ok()
44 }
45
46 fn dealloc_frame(paddr: PhysAddr) {
47 global_allocator().dealloc_pages(phys_to_virt(paddr).as_usize(), 1)
48 }
49
50 #[inline]
51 fn phys_to_virt(paddr: PhysAddr) -> VirtAddr {
52 phys_to_virt(paddr)
53 }
54}
55
56cfg_if::cfg_if! {
57 if #[cfg(target_arch = "x86_64")] {
58 pub type PageTable = page_table_multiarch::x86_64::X64PageTable<PagingHandlerImpl>;
60 } else if #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))] {
61 pub type PageTable = page_table_multiarch::riscv::Sv39PageTable<PagingHandlerImpl>;
63 } else if #[cfg(target_arch = "aarch64")]{
64 pub type PageTable = page_table_multiarch::aarch64::A64PageTable<PagingHandlerImpl>;
66 } else if #[cfg(target_arch = "loongarch64")] {
67 pub type PageTable = page_table_multiarch::loongarch64::LA64PageTable<PagingHandlerImpl>;
69 }
70}
71
72static KERNEL_PAGE_TABLE_ROOT: LazyInit<PhysAddr> = LazyInit::new();
73
74pub fn set_kernel_page_table_root(root_paddr: PhysAddr) {
77 KERNEL_PAGE_TABLE_ROOT.call_once(|| root_paddr);
78 unsafe { crate::arch::write_page_table_root(root_paddr) };
79}
80
81pub fn kernel_page_table_root() -> PhysAddr {
87 *KERNEL_PAGE_TABLE_ROOT
88 .get()
89 .expect("kernel page table not initialized")
90}