feat: add ARMv7-A support with page table structures and tests (#31)

* feat: add ARMv7-A support with page table structures and tests

* feat: add contiguous frame allocation and deallocation methods to PagingHandler

* feat: remove unused feature flag for stmt_expr_attributes

* feat: refactor ARMv7-A descriptor checks and add virtual address index extraction functions

* format code

* Re-exports architecture-specific items for easier access

Unifies the public API by re-exporting architecture-specific definitions,
making them accessible to downstream users without direct module imports.
Improves usability and reduces friction for multi-arch consumers.

* feat: add inline annotations to descriptor attribute functions for optimization

* code fmt

* refactor: consolidate common flag logic in descriptor attribute functions

* refactor: remove unused bits32 module for 32-bit architecture

* refactor: simplify address validation and improve table access methods

* docs: update README to include ARM (32-bit) and correct links for page table structures

* refactor: update TLB flush implementation to use a zero variable

* refactor: enhance descriptor attribute handling for L2 Small Page and improve common flag logic

* refactor: improve code formatting and readability in DescriptorAttr and GenericPTE implementations

* test: add configuration for 32-bit pointer width in ARM32 deallocation test

* test: add conditional compilation for 32-bit pointer width in run_test_for_32bit function

* fix: ensure PageTable32 is imported in 32-bit test function

* code fmt

* fix: update conditional compilation for 32-bit and 64-bit modules

* fix: remove unused bits32 module and clean up imports in lib.rs

* code fmt

* fix: update version and rust-version in Cargo.toml; enhance ARM page table structures

* fix: update conditional compilation for 32-bit and 64-bit modules to include documentation support

* fix: rename allocation functions for clarity and consistency

* fix: implement frame allocation in PagingHandler and remove duplicate function

* fix: add inline attribute to common_flags function in DescriptorAttr

* Rename parameter 'align_pow2' to 'align' in alloc_frames

* feat: add borrowed_entries to PageTable32 for tracking borrowed frames

* feat: add TlbFlusher enum and SMALL_FLUSH_THRESHOLD constant for page table management

Author: luodeb

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         rust-toolchain: [nightly]
-        targets: [x86_64-unknown-linux-gnu, x86_64-unknown-none, riscv64gc-unknown-none-elf, aarch64-unknown-none-softfloat, loongarch64-unknown-none-softfloat]
+        targets: [x86_64-unknown-linux-gnu, x86_64-unknown-none, riscv64gc-unknown-none-elf, aarch64-unknown-none-softfloat, loongarch64-unknown-none-softfloat, armv7a-none-eabi]
     steps:
     - uses: actions/checkout@v4
     - uses: dtolnay/rust-toolchain@nightly

page_table_entry/README.md

@@ -11,17 +11,19 @@ Currently supported architectures and page table entry types:
 
 - x86: [`x86_64::X64PTE`][1]
 - ARM: [`aarch64::A64PTE`][2]
-- RISC-V: [`riscv::Rv64PTE`][3]
-- LoongArch: [`loongarch64::LA64PTE`][4]
+- ARM (32-bit): [`arm::A32PTE`][3]
+- RISC-V: [`riscv::Rv64PTE`][4]
+- LoongArch: [`loongarch64::LA64PTE`][5]
 
-All these types implement the [`GenericPTE`][5] trait, which provides unified
+All these types implement the [`GenericPTE`][6] trait, which provides unified
 methods for manipulating various page table entries.
 
 [1]: https://docs.rs/page_table_entry/latest/page_table_entry/x86_64/struct.X64PTE.html
 [2]: https://docs.rs/page_table_entry/latest/page_table_entry/aarch64/struct.A64PTE.html
-[3]: https://docs.rs/page_table_entry/latest/page_table_entry/riscv/struct.Rv64PTE.html
-[4]: https://docs.rs/page_table_entry/latest/page_table_entry/loongarch64/struct.LA64PTE.html
-[5]: https://docs.rs/page_table_entry/latest/page_table_entry/trait.GenericPTE.html
+[3]: https://docs.rs/page_table_entry/latest/page_table_entry/arm/struct.A32PTE.html
+[4]: https://docs.rs/page_table_entry/latest/page_table_entry/riscv/struct.Rv64PTE.html
+[5]: https://docs.rs/page_table_entry/latest/page_table_entry/loongarch64/struct.LA64PTE.html
+[6]: https://docs.rs/page_table_entry/latest/page_table_entry/trait.GenericPTE.html
 
 ## Examples (x86_64)