Add minimal PAR_EL1.

Author: andre-richter

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cortex-a"
-version = "5.1.3"
+version = "5.1.4"
 authors = ["Andre Richter <andre.o.richter@gmail.com>"]
 description = "Low level access to Cortex-A processors"
 homepage = "https://github.com/rust-embedded/cortex-a"

src/regs/mod.rs

@@ -29,6 +29,7 @@ mod lr;
 mod mair_el1;
 mod midr_el1;
 mod mpidr_el1;
+mod par_el1;
 mod scr_el3;
 mod sctlr_el1;
 mod sp;
@@ -72,6 +73,7 @@ pub use self::lr::LR;
 pub use self::mair_el1::MAIR_EL1;
 pub use self::midr_el1::MIDR_EL1;
 pub use self::mpidr_el1::MPIDR_EL1;
+pub use self::par_el1::PAR_EL1;
 pub use self::scr_el3::SCR_EL3;
 pub use self::sctlr_el1::SCTLR_EL1;
 pub use self::sp::SP;

src/regs/par_el1.rs

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+//
+// Copyright (c) 2021 by the author(s)
+//
+// Author(s):
+//   - Andre Richter <andre.o.richter@gmail.com>
+
+//! Physical Address Register - EL1
+//!
+//! Returns the output address (OA) from an Address translation instruction that executed
+//! successfully, or fault information if the instruction did not execute successfully.
+
+use register::{cpu::RegisterReadWrite, register_bitfields};
+
+register_bitfields! {u64,
+    pub PAR_EL1 [
+        /// Output address. The output address (OA) corresponding to the supplied input address.
+        /// This field returns address bits[47:12].
+        ///
+        /// When ARMv8.2-LPA is implemented, and 52-bit addresses and a 64KB translation granule are
+        /// in use, the PA[51:48] bits form the upper part of the address value. Otherwise the
+        /// PA[51:48] bits are RES0.
+        ///
+        /// For implementations with fewer than 48 physical address bits, the corresponding upper
+        /// bits in this field are RES0.
+        ///
+        /// This field resets to an architecturally UNKNOWN value.
+        PA OFFSET(12) NUMBITS(36) [],
+
+        /// Indicates whether the instruction performed a successful address translation.
+        ///
+        /// 0 Address translation completed successfully.
+        ///
+        /// 1 Address translation aborted.
+        ///
+        /// This field resets to an architecturally UNKNOWN value.
+        F OFFSET(0) NUMBITS(1) [
+            TranslationSuccessfull = 0,
+            TranslationAborted = 1
+        ]
+    ]
+}
+
+pub struct Reg;
+
+impl RegisterReadWrite<u64, PAR_EL1::Register> for Reg {
+    sys_coproc_read_raw!(u64, "PAR_EL1", "x");
+    sys_coproc_write_raw!(u64, "PAR_EL1", "x");
+}
+
+pub static PAR_EL1: Reg = Reg {};