[mm] Create new uspace with parameters passed by user

modules/axmm/src/lib.rs

@@ -19,9 +19,6 @@ use lazyinit::LazyInit;
 use memory_addr::{va, PhysAddr, VirtAddr};
 use memory_set::MappingError;
 
-const USER_ASPACE_BASE: usize = 0x1000;
-const USER_ASPACE_SIZE: usize = 0x7fff_ffff_f000;
-
 static KERNEL_ASPACE: LazyInit<SpinNoIrq<AddrSpace>> = LazyInit::new();
 
 fn mapping_err_to_ax_err(err: MappingError) -> AxError {
@@ -46,8 +43,8 @@ pub fn new_kernel_aspace() -> AxResult<AddrSpace> {
 }
 
 /// Creates a new address space for user processes.
-pub fn new_user_aspace() -> AxResult<AddrSpace> {
-    let mut aspace = AddrSpace::new_empty(VirtAddr::from(USER_ASPACE_BASE), USER_ASPACE_SIZE)?;
+pub fn new_user_aspace(base: VirtAddr, size: usize) -> AxResult<AddrSpace> {
+    let mut aspace = AddrSpace::new_empty(base, size)?;
     if !cfg!(target_arch = "aarch64") {
         // ARMv8 use a separate page table (TTBR0_EL1) for user space, it
         // doesn't need to copy the kernel portion to the user page table.