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wip improve mmu mapping code

This commit is contained in:
Berkus Decker 2021-02-28 00:47:12 +02:00
parent 2b6f1bedf4
commit e8baa13fc3
1 changed files with 29 additions and 21 deletions
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50
nucleus/src/arch/aarch64/memory/mmu.rs
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@ -16,8 +16,10 @@ use crate::memory::PageSize;
use {
crate::memory::{
page_size::{Size1GiB, Size2MiB, Size4KiB},
virt_page::Page,
PhysAddr, PhysFrame, VirtAddr,
//virt_page::Page,
PhysAddr,
PhysFrame,
VirtAddr,
},
core::{
marker::PhantomData,
@ -169,9 +171,10 @@ register_bitfields! {
]
}
type VaIndex = register::FieldValue<u64, VA_INDEX::Register>;
// type VaIndex = register::FieldValue<u64, VA_INDEX::Register>;
type VaType = register::LocalRegisterCopy<u64, VA_INDEX::Register>;
type EntryFlags = register::FieldValue<u64, TABLE_DESCRIPTOR::Register>;
// type EntryRegister = register::LocalRegisterCopy<u64, TABLE_DESCRIPTOR::Register>;
type EntryRegister = register::LocalRegisterCopy<u64, TABLE_DESCRIPTOR::Register>;
// Possible mappings:
// * TTBR0 pointing to user page global directory
@ -358,9 +361,9 @@ struct Directory<Level: TableLevel> {
impl Directory<L0PageGlobalDirectory> {
fn next(&self, address: VirtAddr) -> Option<L0Entries> {
let va = VaIndex::new(address.to_u64());
let va = VaType::new(address.as_u64());
let index = va.read(VA_INDEX::LEVEL0);
match self.next_table_address(index.into()) {
match self.next_table_address(index as usize) {
Some(phys_addr) => Some(L0Entries::UpperDirectoryEntry(phys_addr.user_to_kernel())),
None => None,
}
@ -369,9 +372,9 @@ impl Directory<L0PageGlobalDirectory> {
impl Directory<L1PageUpperDirectory> {
fn next(&self, address: VirtAddr) -> Option<L1Entries> {
let va = VaIndex::new(address.to_u64());
let va = VaType::new(address.as_u64());
let index = va.read(VA_INDEX::LEVEL1);
match self.next_table_address(index.into()) {
match self.next_table_address(index as usize) {
Some(phys_addr) => Some(L1Entries::PageDirectoryEntry(phys_addr.user_to_kernel())),
None => None, // @todo could be 1GiB frame
}
@ -380,9 +383,9 @@ impl Directory<L1PageUpperDirectory> {
impl Directory<L2PageDirectory> {
fn next(&self, address: VirtAddr) -> Option<L2Entries> {
let va = VaIndex::new(address.to_u64());
let va = VaType::new(address.as_u64());
let index = va.read(VA_INDEX::LEVEL2);
match self.next_table_address(index.into()) {
match self.next_table_address(index as usize) {
Some(phys_addr) => Some(L2Entries::PageTableEntry(phys_addr.user_to_kernel())),
None => None, // @todo could be 2MiB frame
}
@ -391,13 +394,14 @@ impl Directory<L2PageDirectory> {
impl Directory<L3PageTable> {
fn next(&self, address: VirtAddr) -> Option<L3Entries> {
let va = VaIndex::new(address.as_u64());
let index = va.read(VA_INDEX::LEVEL3);
match self.next_table_address(index.into()) {
// @fixme wrong function
Some(phys_addr) => Some(L3Entries::PageFrame(phys_addr.user_to_kernel())),
None => None, // Nothing there
}
let va = VaType::new(address.as_u64());
let _index = va.read(VA_INDEX::LEVEL3);
// @fixme wrong function
// match self.next_table_address(index as usize) {
// Some(phys_addr) => Some(L3Entries::PageFrame(phys_addr.user_to_kernel())),
// None => None, // Nothing there
// }
None
}
}
@ -454,7 +458,9 @@ where
// If table entry has 0b11 mask set, it is a valid table entry.
// Address of the following table may be extracted from bits 47:12
if entry_flags.matches_all(TABLE_DESCRIPTOR::VALID::True + TABLE_DESCRIPTOR::TYPE::Table) {
Some(entry_flags.read(NEXT_LVL_TABLE_ADDR_4KiB) << Page4KiB::SHIFT)
Some(PhysAddr::new(
entry_flags.read(TABLE_DESCRIPTOR::NEXT_LVL_TABLE_ADDR_4KiB) << Size4KiB::SHIFT,
))
} else {
None
}
@ -462,15 +468,17 @@ where
pub fn next_table(&self, index: usize) -> Option<&Directory<Level::NextLevel>> {
self.next_table_address(index)
.map(|address| unsafe { &*(address.user_to_kernel() as *const _) })
.map(|address| unsafe { &*(address.user_to_kernel().as_ptr()) })
}
pub fn next_table_mut(&mut self, index: usize) -> Option<&mut Directory<Level::NextLevel>> {
self.next_table_address(index)
.map(|address| unsafe { &mut *(address.user_to_kernel() as *mut _) })
.map(|address| unsafe { &mut *(address.user_to_kernel().as_mut_ptr()) })
}
pub fn translate_levels(&self, address: VirtAddr) -> Option<Frames> {}
pub fn translate_levels(&self, _address: VirtAddr) -> Option<Frames> {
None
}
}
// ----