[WIP] rv32 can enter userland now

kernel/src/arch/riscv32/consts.rs

@@ -19,7 +19,7 @@ pub const MEMORY_END: usize = 0x8060_0000;
 pub const MEMORY_END: usize = 0x8800_0000;
 
 // FIXME: rv64 `sh` and `ls` will crash if stack top > 0x80000000 ???
-pub const USER_STACK_OFFSET: usize = 0x80000000 - USER_STACK_SIZE;
+pub const USER_STACK_OFFSET: usize = 0x40000000 - USER_STACK_SIZE;
 pub const USER_STACK_SIZE: usize = 0x10000;
 
 pub const MAX_DTB_SIZE: usize = 0x2000;

kernel/src/arch/x86_64/driver/vga.rs

@@ -99,9 +99,9 @@ impl VgaBuffer {
 }
 
 lazy_static! {
-    pub static ref VGA_WRITER: Mutex<VgaWriter> = Mutex::new(
-        VgaWriter::new(unsafe{ &mut *((phys_to_virt(0xb8000)) as *mut VgaBuffer) })
-    );
+    pub static ref VGA_WRITER: Mutex<VgaWriter> = Mutex::new(VgaWriter::new(unsafe {
+        &mut *((phys_to_virt(0xb8000)) as *mut VgaBuffer)
+    }));
 }
 
 pub struct VgaWriter {

kernel/src/arch/x86_64/gdt.rs

@@ -48,10 +48,7 @@ impl Cpu {
     }
 
     pub fn iter() -> impl Iterator<Item = &'static Self> {
-        unsafe {
-            CPUS.iter()
-                .filter_map(|x| x.as_ref())
-        }
+        unsafe { CPUS.iter().filter_map(|x| x.as_ref()) }
     }
     pub fn id(&self) -> usize {
         self.id

kernel/src/arch/x86_64/interrupt/mod.rs

@@ -6,8 +6,8 @@ mod trapframe;
 pub use self::handler::*;
 pub use self::trapframe::*;
 use crate::consts::KERNEL_OFFSET;
-use apic::*;
 use crate::memory::phys_to_virt;
+use apic::*;
 
 #[inline(always)]
 pub unsafe fn enable() {

kernel/src/arch/x86_64/ipi.rs

@@ -1,6 +1,5 @@
 /// Interface for inter-processor interrupt.
 /// This module wraps inter-processor interrupt into a broadcast-calling style.
-
 use crate::consts::KERNEL_OFFSET;
 use alloc::boxed::{Box, FnBox};
 use alloc::sync::Arc;

kernel/src/arch/x86_64/mod.rs

@@ -9,12 +9,12 @@ pub mod gdt;
 pub mod idt;
 pub mod interrupt;
 pub mod io;
+pub mod ipi;
 pub mod memory;
 pub mod paging;
 pub mod rand;
 pub mod syscall;
 pub mod timer;
-pub mod ipi;
 
 static AP_CAN_INIT: AtomicBool = AtomicBool::new(false);
 
@@ -34,7 +34,10 @@ pub extern "C" fn _start(boot_info: &'static BootInfo) -> ! {
     // First init log mod, so that we can print log info.
     crate::logging::init();
     info!("{:#x?}", boot_info);
-    assert_eq!(boot_info.physical_memory_offset as usize, consts::PHYSICAL_MEMORY_OFFSET);
+    assert_eq!(
+        boot_info.physical_memory_offset as usize,
+        consts::PHYSICAL_MEMORY_OFFSET
+    );
 
     // Init trap handling.
     idt::init();

kernel/src/arch/x86_64/paging.rs

@@ -286,8 +286,5 @@ fn flush_tlb_all(vaddr: usize) {
     if !super::AP_CAN_INIT.load(Ordering::Relaxed) {
         return;
     }
-    super::ipi::invoke_on_allcpu(
-        move || tlb::flush(VirtAddr::new(vaddr as u64)),
-        false,
-    );
+    super::ipi::invoke_on_allcpu(move || tlb::flush(VirtAddr::new(vaddr as u64)), false);
 }

kernel/src/drivers/provider.rs

@@ -1,9 +1,9 @@
 use alloc::alloc::{alloc_zeroed, dealloc, Layout};
 
+pub use crate::arch::paging::PageTableImpl;
 use isomorphic_drivers::provider;
 use rcore_memory::paging::PageTable;
 use rcore_memory::PAGE_SIZE;
-pub use crate::arch::paging::PageTableImpl;
 
 pub struct Provider;
 

kernel/src/memory.rs

@@ -16,7 +16,7 @@ use super::HEAP_ALLOCATOR;
 pub use crate::arch::paging::*;
 use crate::consts::{KERNEL_OFFSET, MEMORY_OFFSET, PHYSICAL_MEMORY_OFFSET};
 use crate::process::current_thread;
-use crate::sync::{SpinNoIrqLock, MutexGuard, SpinNoIrq};
+use crate::sync::{MutexGuard, SpinNoIrq, SpinNoIrqLock};
 use alloc::boxed::Box;
 use bitmap_allocator::BitAlloc;
 use buddy_system_allocator::Heap;

kernel/src/process/structs.rs

@@ -20,9 +20,9 @@ use crate::memory::{
 use crate::sync::{Condvar, SpinNoIrqLock as Mutex};
 
 use super::abi::{self, ProcInitInfo};
+use crate::processor;
 use core::mem::uninitialized;
 use rcore_fs::vfs::INode;
-use crate::processor;
 
 pub struct Thread {
     context: Context,