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Update mips paging.rs.

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This commit is contained in:
Yuhao Zhou 2019-04-05 12:38:26 +08:00
parent 2d5b6948b5
commit 05f9327272
3 changed files with 36 additions and 128 deletions
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4
kernel/src/arch/mipsel/interrupt.rs
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@ -1,5 +1,5 @@
use mips::interrupts::*;
use mips::registers::*;
use mips::interrupts;
use mips::registers::cp0;
use crate::drivers::DRIVERS;
pub use self::context::*;
use log::*;

2
kernel/src/arch/mipsel/mod.rs
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@ -10,7 +10,7 @@ pub mod syscall;
pub mod rand;
use log::*;
use mips::registers;
use mips::registers::cp0;
use mips::instructions;
extern "C" {

158
kernel/src/arch/mipsel/paging.rs
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@ -1,19 +1,15 @@
use crate::consts::RECURSIVE_INDEX;
// Depends on kernel
use crate::memory::{active_table, alloc_frame, dealloc_frame};
use riscv::addr::*;
use riscv::asm::{sfence_vma, sfence_vma_all};
use riscv::paging::{Mapper, PageTable as RvPageTable, PageTableEntry, PageTableFlags as EF, RecursivePageTable, PageTableType};
use riscv::paging::{FrameAllocator, FrameDeallocator};
use riscv::register::satp;
use mips::addr::*;
use mips::tlb::*;
use mips::paging::{Mapper, PageTable as MIPSPageTable, PageTableEntry, PageTableFlags as EF, TwoLevelPageTable};
use mips::paging::{FrameAllocator, FrameDeallocator};
use rcore_memory::paging::*;
use log::*;
#[cfg(target_arch = "riscv32")]
use crate::consts::KERNEL_P2_INDEX;
#[cfg(target_arch = "riscv64")]
use crate::consts::KERNEL_P4_INDEX;
pub struct ActivePageTable(RecursivePageTable<'static>, PageEntry);
pub struct ActivePageTable(TwoLevelPageTable<'static>, PageEntry);
/// PageTableEntry: the contents of this entry.
/// Page: this entry is the pte of page `Page`.
@ -22,9 +18,8 @@ pub struct PageEntry(&'static mut PageTableEntry, Page);
impl PageTable for ActivePageTable {
fn map(&mut self, addr: usize, target: usize) -> &mut Entry {
// use riscv::paging:Mapper::map_to,
// map the 4K `page` to the 4K `frame` with `flags`
let flags = EF::VALID | EF::READABLE | EF::WRITABLE;
let flags = EF::VALID | EF::WRITABLE | EF::CACHEABLE;
let page = Page::of_addr(VirtAddr::new(addr));
let frame = Frame::of_addr(PhysAddr::new(target));
// map the page to the frame using FrameAllocatorForRiscv
@ -54,41 +49,14 @@ impl PageTable for ActivePageTable {
impl PageTableExt for ActivePageTable {}
/// The virtual address of root page table
#[cfg(target_arch = "riscv32")]
const ROOT_PAGE_TABLE: *mut RvPageTable =
((RECURSIVE_INDEX << 12 << 10) |
((RECURSIVE_INDEX+1) << 12)) as *mut RvPageTable;
#[cfg(all(target_arch = "riscv64", feature = "sv39"))]
const ROOT_PAGE_TABLE: *mut RvPageTable =
((0xFFFF_0000_0000_0000) |
(0o777 << 12 << 9 << 9 << 9) |
(RECURSIVE_INDEX << 12 << 9 << 9) |
(RECURSIVE_INDEX << 12 << 9) |
((RECURSIVE_INDEX+1) << 12)) as *mut RvPageTable;
#[cfg(all(target_arch = "riscv64", not(feature = "sv39")))]
const ROOT_PAGE_TABLE: *mut RvPageTable =
((0xFFFF_0000_0000_0000) |
(RECURSIVE_INDEX << 12 << 9 << 9 << 9) |
(RECURSIVE_INDEX << 12 << 9 << 9) |
(RECURSIVE_INDEX << 12 << 9) |
((RECURSIVE_INDEX+1) << 12)) as *mut RvPageTable;
static ROOT_PAGE_TABLE_BUFFER: MIPSPageTable = ::core::mem::uninitialized();
static mut root_page_table_ptr: usize =
&ROOT_PAGE_TABLE_BUFFER as *const MIPSPageTable as usize;
impl ActivePageTable {
#[cfg(target_arch = "riscv32")]
pub unsafe fn new() -> Self {
ActivePageTable(
RecursivePageTable::new(&mut *ROOT_PAGE_TABLE).unwrap(),
::core::mem::uninitialized()
)
}
#[cfg(target_arch = "riscv64")]
pub unsafe fn new() -> Self {
#[cfg(feature = "sv39")]
let type_ = PageTableType::Sv39;
#[cfg(not(feature = "sv39"))]
let type_ = PageTableType::Sv48;
ActivePageTable(
RecursivePageTable::new(&mut *ROOT_PAGE_TABLE, type_).unwrap(),
TwoLevelPageTable::new(&mut ROOT_PAGE_TABLE_BUFFER),
::core::mem::uninitialized()
)
}
@ -97,36 +65,32 @@ impl ActivePageTable {
/// implementation for the Entry trait in /crate/memory/src/paging/mod.rs
impl Entry for PageEntry {
fn update(&mut self) {
unsafe { sfence_vma(0, self.1.start_address().as_usize()); }
unsafe { clear_all_tlb(); }
}
fn accessed(&self) -> bool { self.0.flags().contains(EF::ACCESSED) }
fn dirty(&self) -> bool { self.0.flags().contains(EF::DIRTY) }
fn writable(&self) -> bool { self.0.flags().contains(EF::WRITABLE) }
fn present(&self) -> bool { self.0.flags().contains(EF::VALID | EF::READABLE) }
fn present(&self) -> bool { self.0.flags().contains(EF::VALID) }
fn clear_accessed(&mut self) { self.0.flags_mut().remove(EF::ACCESSED); }
fn clear_dirty(&mut self) { self.0.flags_mut().remove(EF::DIRTY); }
fn set_writable(&mut self, value: bool) { self.0.flags_mut().set(EF::WRITABLE, value); }
fn set_present(&mut self, value: bool) { self.0.flags_mut().set(EF::VALID | EF::READABLE, value); }
fn set_present(&mut self, value: bool) { self.0.flags_mut().set(EF::VALID, value); }
fn target(&self) -> usize { self.0.addr().as_usize() }
fn set_target(&mut self, target: usize) {
let flags = self.0.flags();
let frame = Frame::of_addr(PhysAddr::new(target));
self.0.set(frame, flags);
}
fn writable_shared(&self) -> bool { self.0.flags().contains(EF::RESERVED1) }
fn readonly_shared(&self) -> bool { self.0.flags().contains(EF::RESERVED2) }
fn set_shared(&mut self, writable: bool) {
let flags = self.0.flags_mut();
flags.set(EF::RESERVED1, writable);
flags.set(EF::RESERVED2, !writable);
}
fn clear_shared(&mut self) { self.0.flags_mut().remove(EF::RESERVED1 | EF::RESERVED2); }
fn writable_shared(&self) -> bool { false }
fn readonly_shared(&self) -> bool { false }
fn set_shared(&mut self, writable: bool) { }
fn clear_shared(&mut self) { }
fn swapped(&self) -> bool { self.0.flags().contains(EF::RESERVED1) }
fn set_swapped(&mut self, value: bool) { self.0.flags_mut().set(EF::RESERVED1, value); }
fn user(&self) -> bool { self.0.flags().contains(EF::USER) }
fn set_user(&mut self, value: bool) { self.0.flags_mut().set(EF::USER, value); }
fn execute(&self) -> bool { self.0.flags().contains(EF::EXECUTABLE) }
fn set_execute(&mut self, value: bool) { self.0.flags_mut().set(EF::EXECUTABLE, value); }
fn user(&self) -> bool { true }
fn set_user(&mut self, value: bool) { }
fn execute(&self) -> bool { true }
fn set_execute(&mut self, value: bool) { }
fn mmio(&self) -> u8 { 0 }
fn set_mmio(&mut self, _value: u8) { }
}
@ -142,93 +106,37 @@ impl InactivePageTable for InactivePageTable0 {
fn new_bare() -> Self {
let target = alloc_frame().expect("failed to allocate frame");
let frame = Frame::of_addr(PhysAddr::new(target));
active_table().with_temporary_map(target, |_, table: &mut RvPageTable| {
active_table().with_temporary_map(target, |_, table: &mut MIPSPageTable| {
table.zero();
table.set_recursive(RECURSIVE_INDEX, frame.clone());
});
InactivePageTable0 { root_frame: frame }
}
#[cfg(target_arch = "riscv32")]
fn map_kernel(&mut self) {
let table = unsafe { &mut *ROOT_PAGE_TABLE };
extern {
fn start();
fn end();
}
let mut entrys: [PageTableEntry; 16] = unsafe { core::mem::uninitialized() };
let entry_start = start as usize >> 22;
let entry_end = (end as usize >> 22) + 1;
let entry_count = entry_end - entry_start;
for i in 0..entry_count {
entrys[i] = table[entry_start + i];
}
fn map_kernel(&mut self) { /* nothing to do */ }
self.edit(|_| {
// NOTE: 'table' now refers to new page table
for i in 0..entry_count {
table[entry_start + i] = entrys[i];
}
});
}
#[cfg(target_arch = "riscv64")]
fn map_kernel(&mut self) {
let table = unsafe { &mut *ROOT_PAGE_TABLE };
let e1 = table[KERNEL_P4_INDEX];
assert!(!e1.is_unused());
self.edit(|_| {
table[KERNEL_P4_INDEX] = e1;
});
}
#[cfg(target_arch = "riscv32")]
fn token(&self) -> usize {
self.root_frame.number() | (1 << 31) // as satp
}
#[cfg(target_arch = "riscv64")]
fn token(&self) -> usize {
use bit_field::BitField;
let mut satp = self.root_frame.number();
satp.set_bits(44..60, 0); // AS is 0
#[cfg(feature = "sv39")]
satp.set_bits(60..64, satp::Mode::Sv39 as usize);
#[cfg(not(feature = "sv39"))]
satp.set_bits(60..64, satp::Mode::Sv48 as usize);
satp
self.root_frame.to_kernel_unmapped().as_usize()
}
unsafe fn set_token(token: usize) {
asm!("csrw satp, $0" :: "r"(token) :: "volatile");
root_page_table_ptr = token;
}
fn active_token() -> usize {
satp::read().bits()
root_page_table_ptr
}
fn flush_tlb() {
unsafe { sfence_vma_all(); }
unsafe { clear_all_tlb(); }
}
fn edit<T>(&mut self, f: impl FnOnce(&mut Self::Active) -> T) -> T {
let target = satp::read().frame().start_address().as_usize();
active_table().with_temporary_map(target, |active_table, root_table: &mut RvPageTable| {
let backup = root_table[RECURSIVE_INDEX].clone();
// overwrite recursive mapping
root_table[RECURSIVE_INDEX].set(self.root_frame.clone(), EF::VALID);
unsafe { sfence_vma_all(); }
// execute f in the new context
let ret = f(active_table);
// restore recursive mapping to original p2 table
root_table[RECURSIVE_INDEX] = backup;
unsafe { sfence_vma_all(); }
ret
})
let pt: *MIPSPageTable = self.token() as *MIPSPageTable;
let active = ActivePageTable(
TwoLevelPageTable::new(&mut *pt),
::core::mem::uninitialized()
);
f(&mut active)
}
}