Rename modules/axerror to crates/axerrno, add more error kinds

Author: equation314

Cargo.toml

@@ -8,7 +8,7 @@ authors = ["Yuekai Jia <[email protected]>"]
 
 [dependencies]
 cfg-if = "1.0"
-bitflags = "1.3"
+bitflags = "2.0"
 memory_addr = { path = "../memory_addr" }
 
 [target.'cfg(target_arch = "x86_64")'.dependencies]

src/arch/aarch64.rs

@@ -5,6 +5,7 @@ use crate::{GenericPTE, MappingFlags};
 
 bitflags::bitflags! {
     /// Memory attribute fields in the VMSAv8-64 translation table format descriptors.
+    #[derive(Debug)]
     pub struct DescriptorAttr: u64 {
         // Attribute fields in stage 1 VMSAv8-64 Block and Page descriptors:
 

src/arch/riscv.rs

@@ -5,6 +5,7 @@ use crate::{GenericPTE, MappingFlags};
 
 bitflags::bitflags! {
     /// Page-table entry flags.
+    #[derive(Debug)]
     pub struct PTEFlags: usize {
         /// Whether the PTE is valid.
         const V =   1 << 0;

src/lib.rs

@@ -9,6 +9,7 @@ use memory_addr::PhysAddr;
 pub use arch::*;
 
 bitflags::bitflags! {
+    #[derive(Debug, Clone, Copy)]
     pub struct MappingFlags: usize {
         const READ          = 1 << 0;
         const WRITE         = 1 << 1;