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Fix bug and enable swap in/out and frame delayed allocating.

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master
lcy1996 6 years ago
parent b1425a53f9
commit c8ea2cb0cf
10 changed files with 162 additions and 94 deletions
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21
crate/memory/src/cow.rs
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@ -91,27 +91,6 @@ impl<T: PageTable> CowExt<T> {
** @retval bool whether copy-on-write happens. ** @retval bool whether copy-on-write happens.
*/ */
pub fn page_fault_handler(&mut self, addr: VirtAddr, alloc_frame: impl FnOnce() -> PhysAddr) -> bool { pub fn page_fault_handler(&mut self, addr: VirtAddr, alloc_frame: impl FnOnce() -> PhysAddr) -> bool {
// handle page delayed allocating
{
info!("try handling delayed frame allocator");
let need_alloc ={
let entry = self.page_table.get_entry(addr);
//info!("got entry!");
!entry.present() && !entry.swapped()
};
if need_alloc{
info!("need_alloc!");
let frame = alloc_frame();
let entry = self.page_table.get_entry(addr);
entry.set_target(frame);
//let new_entry = self.page_table.map(addr, frame);
entry.set_present(true);
entry.update();
//area.get_flags().apply(new_entry); this instruction may be used when hide attr is used
info!("allocated successfully");
return true;
}
}
// below is not being used now(no shared pages) // below is not being used now(no shared pages)
{ {
let entry = self.page_table.get_entry(addr); let entry = self.page_table.get_entry(addr);

55
crate/memory/src/swap/mod.rs
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@ -109,12 +109,27 @@ impl<T: PageTable, M: SwapManager, S: Swapper> SwapExt<T, M, S> {
** @param pt: *mut T2 the raw pointer for the target page's inactive page table ** @param pt: *mut T2 the raw pointer for the target page's inactive page table
** @param addr: VirtAddr the target page's virtual address ** @param addr: VirtAddr the target page's virtual address
*/ */
pub fn set_swappable<T2: InactivePageTable>(&mut self, pt: *mut T2, addr: VirtAddr){ pub unsafe fn set_swappable<T2: InactivePageTable>(&mut self, pt: *mut T2, addr: VirtAddr){
let Self {ref mut page_table, ref mut swap_manager, ref mut swapper} = self;
let targetpt = &mut *(pt);
let pttoken = {
debug!("the target page table token is {:x?}", targetpt.token());
targetpt.token()
};
targetpt.with(||{
let entry = page_table.get_entry(addr);
if entry.present() {
let frame = Frame::new(pt as usize, addr, pttoken);
swap_manager.push(frame);
}
});
/*
let token = unsafe{ let token = unsafe{
(*pt).token() (*pt).token()
}; };
let frame = Frame::new(pt as usize, addr, token); let frame = Frame::new(pt as usize, addr, token);
self.swap_manager.push(frame); self.swap_manager.push(frame);
*/
} }
/* /*
@ -132,11 +147,14 @@ impl<T: PageTable, M: SwapManager, S: Swapper> SwapExt<T, M, S> {
targetpt.token() targetpt.token()
}; };
debug!("try to change pagetable"); debug!("try to change pagetable");
let targetaddr = targetpt.with(||{ targetpt.with(||{
let token = { let token = {
let entry = page_table.get_entry(addr); let entry = page_table.get_entry(addr);
if !entry.swapped() { if !entry.swapped() {
if entry.present(){
// if the addr isn't indicating a swapped page, panic occured here
swap_manager.remove(pttoken, addr); swap_manager.remove(pttoken, addr);
}
return; return;
} }
let token = entry.target() / PAGE_SIZE; let token = entry.target() / PAGE_SIZE;
@ -250,17 +268,46 @@ impl<T: PageTable, M: SwapManager, S: Swapper> SwapExt<T, M, S> {
Ok(()) Ok(())
} }
/* /*
** @brief execute the swap process for page fault ** @brief execute the frame delayed allocate and swap process for page fault
** This function must be called whenever PageFault happens. ** This function must be called whenever PageFault happens.
** @param pt: *mut T2 the raw pointer for the target page's inactive page table (exactly the current page table) ** @param pt: *mut T2 the raw pointer for the target page's inactive page table (exactly the current page table)
** @param addr: VirtAddr the virual address of the page fault ** @param addr: VirtAddr the virual address of the page fault
** @param swapin: bool whether to set the page swappable if delayed allocate a frame for a page
** @param alloc_frame: impl FnOnce() -> PhysAddr ** @param alloc_frame: impl FnOnce() -> PhysAddr
** the page allocation function ** the page allocation function
** that allocate a page and returns physics address ** that allocate a page and returns physics address
** of beginning of the page ** of beginning of the page
** @retval bool whether swap in happens. ** @retval bool whether swap in happens.
*/ */
pub fn page_fault_handler<T2: InactivePageTable>(&mut self, pt: *mut T2, addr: VirtAddr, alloc_frame: impl FnOnce() -> PhysAddr) -> bool { pub fn page_fault_handler<T2: InactivePageTable>(&mut self, pt: *mut T2, addr: VirtAddr, swapin: bool, alloc_frame: impl FnOnce() -> PhysAddr) -> bool {
// handle page delayed allocating
{
info!("try handling delayed frame allocator");
let need_alloc ={
let entry = self.page_table.get_entry(addr);
//info!("got entry!");
!entry.present() && !entry.swapped()
};
if need_alloc{
info!("need_alloc!");
let frame = alloc_frame();
{
let entry = self.page_table.get_entry(addr);
entry.set_target(frame);
//let new_entry = self.page_table.map(addr, frame);
entry.set_present(true);
entry.update();
}
if(swapin){
unsafe {
self.set_swappable(pt, addr);
}
}
//area.get_flags().apply(new_entry); this instruction may be used when hide attr is used
info!("allocated successfully");
return true;
}
}
// now we didn't attach the cow so the present will be false when swapped(), to enable the cow some changes will be needed // now we didn't attach the cow so the present will be false when swapped(), to enable the cow some changes will be needed
if !self.page_table.get_entry(addr).swapped() { if !self.page_table.get_entry(addr).swapped() {
return false; return false;

4
crate/process/src/processor.rs
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@ -262,6 +262,10 @@ impl<T: Context, S: Scheduler> Processor_<T, S> {
&mut self.get_mut(id).context &mut self.get_mut(id).context
} }
pub fn get_context_mut(&mut self, pid: Pid) -> &mut T{
&mut self.get_mut(pid).context
}
/* /*
** @brief get pid of current process ** @brief get pid of current process
** @param none ** @param none

3
kernel/src/arch/riscv32/interrupt.rs
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@ -1,5 +1,7 @@
use super::riscv::register::*; use super::riscv::register::*;
pub use self::context::*; pub use self::context::*;
use ::memory::{InactivePageTable0, memory_set_record};
use memory::MemorySet;
#[path = "context.rs"] #[path = "context.rs"]
mod context; mod context;
@ -67,7 +69,6 @@ pub unsafe fn restore(flags: usize) {
pub extern fn rust_trap(tf: &mut TrapFrame) { pub extern fn rust_trap(tf: &mut TrapFrame) {
use super::riscv::register::scause::{Trap, Interrupt as I, Exception as E}; use super::riscv::register::scause::{Trap, Interrupt as I, Exception as E};
trace!("Interrupt: {:?}", tf.scause.cause()); trace!("Interrupt: {:?}", tf.scause.cause());
// page should be processed here but not now
match tf.scause.cause() { match tf.scause.cause() {
Trap::Interrupt(I::SupervisorTimer) => timer(), Trap::Interrupt(I::SupervisorTimer) => timer(),
Trap::Exception(E::IllegalInstruction) => illegal_inst(tf), Trap::Exception(E::IllegalInstruction) => illegal_inst(tf),

4
kernel/src/arch/riscv32/paging.rs
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@ -156,6 +156,10 @@ impl ActivePageTable {
// Unmap the page // Unmap the page
self.unmap(0xcafebabe); self.unmap(0xcafebabe);
} }
pub fn token() -> usize {
satp::read().frame().number() | (1 << 31)
}
} }
/// implementation for the Entry trait in /crate/memory/src/paging/mod.rs /// implementation for the Entry trait in /crate/memory/src/paging/mod.rs
impl Entry for PageEntry { impl Entry for PageEntry {

10
kernel/src/fs.rs
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@ -4,6 +4,10 @@ use alloc::boxed::Box;
use arch::driver::ide; use arch::driver::ide;
use spin::Mutex; use spin::Mutex;
use ::memory::{InactivePageTable0, memory_set_record};
use memory::MemorySet;
use process::context::memory_set_map_swappable;
// Hard link user program // Hard link user program
#[cfg(target_arch = "riscv32")] #[cfg(target_arch = "riscv32")]
global_asm!(r#" global_asm!(r#"
@ -48,7 +52,11 @@ pub fn shell() {
if let Ok(file) = root.borrow().lookup(name.as_str()) { if let Ok(file) = root.borrow().lookup(name.as_str()) {
use process::*; use process::*;
let len = file.borrow().read_at(0, &mut *buf).unwrap(); let len = file.borrow().read_at(0, &mut *buf).unwrap();
let pid = processor().add(Context::new_user(&buf[..len])); let mut new_context = Context::new_user(&buf[..len]);
//memory_set_record().push_back((new_context.get_memory_set_mut() as *mut MemorySet) as usize);
let pid = processor().add(new_context);
// map swappable for the new user process's memroy areas (only for the page which has been allocated)
memory_set_map_swappable(processor().get_context_mut(pid).get_memory_set_mut());
processor().current_wait_for(pid); processor().current_wait_for(pid);
} else { } else {
println!("Program not exist"); println!("Program not exist");

76
kernel/src/memory.rs
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@ -5,11 +5,12 @@ use consts::MEMORY_OFFSET;
use super::HEAP_ALLOCATOR; use super::HEAP_ALLOCATOR;
use ucore_memory::{*, paging::PageTable}; use ucore_memory::{*, paging::PageTable};
use ucore_memory::cow::CowExt; use ucore_memory::cow::CowExt;
pub use ucore_memory::memory_set::{MemoryArea, MemoryAttr, MemorySet as MemorySet_, Stack}; pub use ucore_memory::memory_set::{MemoryArea, MemoryAttr, MemorySet as MemorySet_, Stack, InactivePageTable};
use ucore_memory::swap::*; use ucore_memory::swap::*;
use process::{processor, PROCESSOR}; use process::{processor, PROCESSOR};
use sync::{SpinNoIrqLock, SpinNoIrq, MutexGuard}; use sync::{SpinNoIrqLock, SpinNoIrq, MutexGuard};
use ucore_memory::paging::Entry; use alloc::collections::VecDeque;
pub type MemorySet = MemorySet_<InactivePageTable0>; pub type MemorySet = MemorySet_<InactivePageTable0>;
@ -24,7 +25,15 @@ pub type FrameAlloc = BitAlloc4K;
lazy_static! { lazy_static! {
pub static ref FRAME_ALLOCATOR: SpinNoIrqLock<FrameAlloc> = SpinNoIrqLock::new(FrameAlloc::default()); pub static ref FRAME_ALLOCATOR: SpinNoIrqLock<FrameAlloc> = SpinNoIrqLock::new(FrameAlloc::default());
} }
// record the user memory set for pagefault function (swap in/out and frame delayed allocate) temporarily when page fault in new_user() or fork() function
// after the process is set we can use use processor() to get the inactive page table
lazy_static! {
pub static ref MEMORY_SET_RECORD: SpinNoIrqLock<VecDeque<usize>> = SpinNoIrqLock::new(VecDeque::default());
}
pub fn memory_set_record() -> MutexGuard<'static, VecDeque<usize>, SpinNoIrq> {
MEMORY_SET_RECORD.lock()
}
lazy_static! { lazy_static! {
static ref ACTIVE_TABLE: SpinNoIrqLock<CowExt<ActivePageTable>> = SpinNoIrqLock::new(unsafe { static ref ACTIVE_TABLE: SpinNoIrqLock<CowExt<ActivePageTable>> = SpinNoIrqLock::new(unsafe {
@ -86,49 +95,44 @@ pub fn alloc_stack() -> Stack {
* Return true to continue, false to halt * Return true to continue, false to halt
*/ */
pub fn page_fault_handler(addr: usize) -> bool { pub fn page_fault_handler(addr: usize) -> bool {
// since some page fault for frame delayed allocating may occur in the building of the process, we can't use processor() to get the real memset for it info!("start handling swap in/out page fault");
// unless we write a mmset manager for all the memory set, which is a little bit hard. unsafe { ACTIVE_TABLE_SWAP.force_unlock(); }
/*
info!("come in to page fault handler.");
{
info!("1");
unsafe {PROCESSOR.try().unwrap().force_unlock();} unsafe {PROCESSOR.try().unwrap().force_unlock();}
let mut temp_proc = processor(); let mut temp_proc = processor();
info!("2"); debug!("active page table token in pg fault is {:x?}", ActivePageTable::token());
let mmset = temp_proc.current_context_mut().get_memory_set_mut(); let id = memory_set_record().iter()
let target_area = mmset.find_area(addr); .position(|x| unsafe{(*(x.clone() as *mut MemorySet)).get_page_table_mut().token() == ActivePageTable::token()});
// check whether the virtual address is valid let mut mmsets = memory_set_record();
info!("checked the valid virtual address"); match id {
match target_area { Some(targetid) => {
None => { debug!("get id from memroy set recorder.");
info!("invalid virtual address: {:x?}", addr); let mmset_ptr = mmsets.get(targetid);
return false; let pt = unsafe { (*(mmset_ptr.unwrap().clone() as *mut MemorySet)).get_page_table_mut() };
}, if active_table_swap().page_fault_handler(pt as *mut InactivePageTable0, addr, false, || alloc_frame().unwrap()){
Some(area)=>{
// Handle delayed frame allocate and copy on write (the second not being used now)
unsafe { ACTIVE_TABLE.force_unlock(); }
if active_table().page_fault_handler(addr, || alloc_frame().unwrap()) {
return true; return true;
} }
}, },
} None => {
} debug!("get pt from processor()");
*/ let pt = temp_proc.current_context_mut().get_memory_set_mut().get_page_table_mut();
if active_table_swap().page_fault_handler(pt as *mut InactivePageTable0, addr, true, || alloc_frame().unwrap()){
// Handle delayed frame allocate and copy on write (the second not being used now)
unsafe { ACTIVE_TABLE.force_unlock(); }
if active_table().page_fault_handler(addr, || alloc_frame().unwrap()){
info!("general page fault handle successfully!");
return true; return true;
} }
},
};
// handle the swap in/out // handle the swap in/out
info!("start handling swap in/out page fault"); //info!("start handling swap in/out page fault");
let mut temp_proc = processor(); //let mut temp_proc = processor();
let pt = temp_proc.current_context_mut().get_memory_set_mut().get_page_table_mut(); //let pt = temp_proc.current_context_mut().get_memory_set_mut().get_page_table_mut();
unsafe { ACTIVE_TABLE_SWAP.force_unlock(); } //let pt = unsafe { (*(mmset_ptr.unwrap().clone() as *mut MemorySet)).get_page_table_mut() };
if active_table_swap().page_fault_handler(pt as *mut InactivePageTable0, addr, || alloc_frame().unwrap()){
// Handle copy on write (not being used now)
unsafe { ACTIVE_TABLE.force_unlock(); }
if active_table().page_fault_handler(addr, || alloc_frame().unwrap()){
return true; return true;
} }
false false

59
kernel/src/process/context.rs
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@ -3,7 +3,8 @@ use memory::{MemoryArea, MemoryAttr, MemorySet, active_table_swap, alloc_frame};
use xmas_elf::{ElfFile, header, program::{Flags, ProgramHeader, Type}}; use xmas_elf::{ElfFile, header, program::{Flags, ProgramHeader, Type}};
use core::fmt::{Debug, Error, Formatter}; use core::fmt::{Debug, Error, Formatter};
use ucore_memory::{Page}; use ucore_memory::{Page};
use ::memory::{InactivePageTable0}; use ::memory::{InactivePageTable0, memory_set_record};
use ucore_memory::memory_set::*;
pub struct Context { pub struct Context {
arch: ArchContext, arch: ArchContext,
@ -61,7 +62,7 @@ impl Context {
* the new user thread Context * the new user thread Context
*/ */
pub fn new_user(data: &[u8]) -> Self { pub fn new_user(data: &[u8]) -> Self {
info!("come into new user"); debug!("come into new user");
// Parse elf // Parse elf
let elf = ElfFile::new(data).expect("failed to read elf"); let elf = ElfFile::new(data).expect("failed to read elf");
let is32 = match elf.header.pt2 { let is32 = match elf.header.pt2 {
@ -71,7 +72,6 @@ impl Context {
assert_eq!(elf.header.pt2.type_().as_type(), header::Type::Executable, "ELF is not executable"); assert_eq!(elf.header.pt2.type_().as_type(), header::Type::Executable, "ELF is not executable");
// User stack // User stack
info!("start building suer stack");
use consts::{USER_STACK_OFFSET, USER_STACK_SIZE, USER32_STACK_OFFSET}; use consts::{USER_STACK_OFFSET, USER_STACK_SIZE, USER32_STACK_OFFSET};
let (user_stack_buttom, user_stack_top) = match is32 { let (user_stack_buttom, user_stack_top) = match is32 {
true => (USER32_STACK_OFFSET, USER32_STACK_OFFSET + USER_STACK_SIZE), true => (USER32_STACK_OFFSET, USER32_STACK_OFFSET + USER_STACK_SIZE),
@ -79,16 +79,20 @@ impl Context {
}; };
// Make page table // Make page table
info!("make page table!");
let mut memory_set = memory_set_from(&elf); let mut memory_set = memory_set_from(&elf);
info!("start to push user stack to the mmset");
// add the new memory set to the recorder
let mmset_ptr = ((&mut memory_set) as * mut MemorySet) as usize;
memory_set_record().push_back(mmset_ptr);
//let id = memory_set_record().iter()
// .position(|x| unsafe { info!("current memory set record include {:x?}, {:x?}", x, (*(x.clone() as *mut MemorySet)).get_page_table_mut().token()); false });
memory_set.push(MemoryArea::new(user_stack_buttom, user_stack_top, MemoryAttr::default().user(), "user_stack")); memory_set.push(MemoryArea::new(user_stack_buttom, user_stack_top, MemoryAttr::default().user(), "user_stack"));
trace!("{:#x?}", memory_set); trace!("{:#x?}", memory_set);
let entry_addr = elf.header.pt2.entry_point() as usize; let entry_addr = elf.header.pt2.entry_point() as usize;
// Temporary switch to it, in order to copy data // Temporary switch to it, in order to copy data
info!("starting copy data.");
unsafe { unsafe {
memory_set.with(|| { memory_set.with(|| {
for ph in elf.program_iter() { for ph in elf.program_iter() {
@ -98,13 +102,9 @@ impl Context {
if file_size == 0 { if file_size == 0 {
return; return;
} }
info!("file virtaddr: {:x?}, file size: {:x?}", virt_addr, file_size);
use core::slice; use core::slice;
info!("starting copy!");
let target = unsafe { slice::from_raw_parts_mut(virt_addr as *mut u8, file_size) }; let target = unsafe { slice::from_raw_parts_mut(virt_addr as *mut u8, file_size) };
info!("target got!");
target.copy_from_slice(&data[offset..offset + file_size]); target.copy_from_slice(&data[offset..offset + file_size]);
info!("finish copy!");
} }
if is32 { if is32 {
unsafe { unsafe {
@ -115,11 +115,12 @@ impl Context {
} }
}); });
} }
info!("ending copy data.");
//set the user Memory pages in the memory set swappable //set the user Memory pages in the memory set swappable
//memory_set_map_swappable(&mut memory_set); //memory_set_map_swappable(&mut memory_set);
let id = memory_set_record().iter()
.position(|x| x.clone() == mmset_ptr).unwrap();
memory_set_record().remove(id);
Context { Context {
arch: unsafe { arch: unsafe {
ArchContext::new_user_thread( ArchContext::new_user_thread(
@ -131,9 +132,15 @@ impl Context {
/// Fork /// Fork
pub fn fork(&self, tf: &TrapFrame) -> Self { pub fn fork(&self, tf: &TrapFrame) -> Self {
debug!("Come in to fork!");
// Clone memory set, make a new page table // Clone memory set, make a new page table
let mut memory_set = self.memory_set.clone(); let mut memory_set = self.memory_set.clone();
// add the new memory set to the recorder
debug!("fork! new page table token: {:x?}", memory_set.token());
let mmset_ptr = ((&mut memory_set) as * mut MemorySet) as usize;
memory_set_record().push_back(mmset_ptr);
// Copy data to temp space // Copy data to temp space
use alloc::vec::Vec; use alloc::vec::Vec;
let datas: Vec<Vec<u8>> = memory_set.iter().map(|area| { let datas: Vec<Vec<u8>> = memory_set.iter().map(|area| {
@ -148,9 +155,11 @@ impl Context {
} }
}); });
} }
// map the memory set swappable
memory_set_map_swappable(&mut memory_set);
// remove the raw pointer for the memory set since it will
let id = memory_set_record().iter()
.position(|x| x.clone() == mmset_ptr).unwrap();
memory_set_record().remove(id);
Context { Context {
arch: unsafe { ArchContext::new_fork(tf, memory_set.kstack_top(), memory_set.token()) }, arch: unsafe { ArchContext::new_fork(tf, memory_set.kstack_top(), memory_set.token()) },
memory_set, memory_set,
@ -165,7 +174,16 @@ impl Context {
impl Drop for Context{ impl Drop for Context{
fn drop(&mut self){ fn drop(&mut self){
// remove the new memory set to the recorder (deprecated in the latest version)
/* /*
let id = memory_set_record().iter()
.position(|x| unsafe{(*(x.clone() as *mut MemorySet)).token() == self.memory_set.token()});
if id.is_some(){
info!("remove id {:x?}", id.unwrap());
memory_set_record().remove(id.unwrap());
}
*/
//set the user Memory pages in the memory set unswappable //set the user Memory pages in the memory set unswappable
let Self {ref mut arch, ref mut memory_set} = self; let Self {ref mut arch, ref mut memory_set} = self;
let pt = { let pt = {
@ -179,8 +197,8 @@ impl Drop for Context{
} }
} }
} }
info!("Finishing setting pages unswappable"); debug!("Finishing setting pages unswappable");
*/
} }
} }
@ -199,7 +217,7 @@ impl Debug for Context {
* the new memory set * the new memory set
*/ */
fn memory_set_from<'a>(elf: &'a ElfFile<'a>) -> MemorySet { fn memory_set_from<'a>(elf: &'a ElfFile<'a>) -> MemorySet {
info!("come in to memory_set_from"); debug!("come in to memory_set_from");
let mut set = MemorySet::new(); let mut set = MemorySet::new();
for ph in elf.program_iter() { for ph in elf.program_iter() {
if ph.get_type() != Ok(Type::Load) { if ph.get_type() != Ok(Type::Load) {
@ -209,7 +227,6 @@ fn memory_set_from<'a>(elf: &'a ElfFile<'a>) -> MemorySet {
ProgramHeader::Ph32(ph) => (ph.virtual_addr as usize, ph.mem_size as usize, ph.flags), ProgramHeader::Ph32(ph) => (ph.virtual_addr as usize, ph.mem_size as usize, ph.flags),
ProgramHeader::Ph64(ph) => (ph.virtual_addr as usize, ph.mem_size as usize, ph.flags),//??? ProgramHeader::Ph64(ph) => (ph.virtual_addr as usize, ph.mem_size as usize, ph.flags),//???
}; };
info!("push!");
set.push(MemoryArea::new(virt_addr, virt_addr + mem_size, memory_attr_from(flags), "")); set.push(MemoryArea::new(virt_addr, virt_addr + mem_size, memory_attr_from(flags), ""));
} }
@ -229,15 +246,15 @@ fn memory_attr_from(elf_flags: Flags) -> MemoryAttr {
* @brief: * @brief:
* map the memory area in the memory_set swappalbe, specially for the user process * map the memory area in the memory_set swappalbe, specially for the user process
*/ */
fn memory_set_map_swappable(memory_set: &mut MemorySet){ pub fn memory_set_map_swappable(memory_set: &mut MemorySet){
let pt = unsafe { let pt = unsafe {
memory_set.get_page_table_mut() as *mut InactivePageTable0 memory_set.get_page_table_mut() as *mut InactivePageTable0
}; };
for area in memory_set.iter(){ for area in memory_set.iter(){
for page in Page::range_of(area.get_start_addr(), area.get_end_addr()) { for page in Page::range_of(area.get_start_addr(), area.get_end_addr()) {
let addr = page.start_address(); let addr = page.start_address();
active_table_swap().set_swappable(pt, addr); unsafe { active_table_swap().set_swappable(pt, addr); }
} }
} }
info!("Finishing setting pages swappable"); debug!("Finishing setting pages swappable");
} }

2
kernel/src/process/mod.rs
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@ -5,7 +5,7 @@ pub use ucore_process::processor::{*, Context as _whatever};
pub use ucore_process::scheduler::*; pub use ucore_process::scheduler::*;
pub use ucore_process::thread::*; pub use ucore_process::thread::*;
mod context; pub mod context;
type Processor = Processor_<Context, StrideScheduler>; type Processor = Processor_<Context, StrideScheduler>;

4
kernel/src/syscall.rs
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@ -7,6 +7,8 @@ use process::*;
use thread; use thread;
use util; use util;
use process::context::memory_set_map_swappable;
/// 系统调用入口点 /// 系统调用入口点
/// ///
/// 当发生系统调用中断时，中断服务例程将控制权转移到这里。 /// 当发生系统调用中断时，中断服务例程将控制权转移到这里。
@ -61,6 +63,8 @@ fn sys_fork(tf: &TrapFrame) -> i32 {
let mut processor = processor(); let mut processor = processor();
let context = processor.current_context().fork(tf); let context = processor.current_context().fork(tf);
let pid = processor.add(context); let pid = processor.add(context);
// map swappable for the forked process's memroy areas (only for the page which has been allocated)
memory_set_map_swappable(processor.get_context_mut(pid).get_memory_set_mut());
info!("fork: {} -> {}", processor.current_pid(), pid); info!("fork: {} -> {}", processor.current_pid(), pid);
pid as i32 pid as i32
} }

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