Merge pull request #58 from kisum9/add-contextidr_el1-register

Add CONTEXTIDR_EL1 register.

Author: berkus

src/registers.rs

@@ -37,6 +37,7 @@ mod cntv_cval_el0;
 mod cntv_tval_el0;
 mod cntvct_el0;
 mod cntvoff_el2;
+mod contextidr_el1;
 mod cpacr_el1;
 mod cptr_el2;
 mod csselr_el1;
@@ -180,6 +181,7 @@ pub use cntv_cval_el0::CNTV_CVAL_EL0;
 pub use cntv_tval_el0::CNTV_TVAL_EL0;
 pub use cntvct_el0::CNTVCT_EL0;
 pub use cntvoff_el2::CNTVOFF_EL2;
+pub use contextidr_el1::CONTEXTIDR_EL1;
 pub use cpacr_el1::CPACR_EL1;
 pub use cptr_el2::CPTR_EL2;
 pub use csselr_el1::CSSELR_EL1;

src/registers/contextidr_el1.rs

@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+//
+// Copyright (c) 2025 by the author(s)
+//
+// Author(s):
+//   - Yan Tan <[email protected]>
+
+//! Context ID Register
+//!
+//! Holds the Process Context ID (PCID) for the current process.
+//! This register is used to identify the current process context.
+
+use tock_registers::{
+    interfaces::{Readable, Writeable},
+    register_bitfields,
+};
+
+register_bitfields! {u64,
+    pub CONTEXTIDR_EL1 [
+        // Reserved, RES0，[63:32]
+
+        /// Process Identifier
+        ///
+        /// This field must be programmed with a unique value that identifies the current process.
+        ///
+        /// - In AArch32 state, when TTBCR.EAE is set to 0, CONTEXTIDR.ASID holds the ASID
+        /// - In AArch64 state, CONTEXTIDR_EL1 is independent of the ASID, \
+        ///   and for the EL1&0 translation regime either TTBR0_EL1 or TTBR1_EL1 holds the ASID.
+        ///
+        /// On a Cold reset, this field resets to an architecturally UNKNOWN value
+        PROCID OFFSET(0) NUMBITS(32) []
+    ]
+}
+
+pub struct Reg;
+
+impl Readable for Reg {
+    type T = u64;
+    type R = CONTEXTIDR_EL1::Register;
+
+    sys_coproc_read_raw!(u64, "S3_0_C13_C0_1", "x");
+}
+
+impl Writeable for Reg {
+    type T = u64;
+    type R = CONTEXTIDR_EL1::Register;
+
+    sys_coproc_write_raw!(u64, "S3_0_C13_C0_1", "x");
+}
+
+pub const CONTEXTIDR_EL1: Reg = Reg {};