From:   Sunil V L <sunilvl@ventanamicro.com>
To:     Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Len Brown <lenb@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Marc Zyngier <maz@kernel.org>, Jonathan Corbet <corbet@lwn.net>
Cc:     linux-riscv@lists.infradead.org, linux-acpi@vger.kernel.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Conor Dooley <conor.dooley@microchip.com>,
        Andrew Jones <ajones@ventanamicro.com>,
        Anup Patel <apatel@ventanamicro.com>,
        Atish Patra <atishp@rivosinc.com>,
        Sunil V L <sunilvl@ventanamicro.com>,
        Robert Moore <robert.moore@intel.com>,
        acpica-devel@lists.linuxfoundation.org,
        "Rafael J . Wysocki" <rafael.j.wysocki@intel.com>
Subject: [PATCH V2 03/21] ACPICA: Add structure definitions for RISC-V RHCT
Date:   Thu, 16 Feb 2023 23:50:25 +0530
Message-Id: <20230216182043.1946553-4-sunilvl@ventanamicro.com>
In-Reply-To: <20230216182043.1946553-1-sunilvl@ventanamicro.com>
References: <20230216182043.1946553-1-sunilvl@ventanamicro.com>
MIME-Version: 1.0
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Precedence: bulk

RISC-V Hart Capabilities Table (RHCT) is a new static table.
The ECR to add RHCT is approved by the UEFI forum and will be
available in the next version of the ACPI spec.

This patch is not yet merged in ACPICA but a PR is raised.

ACPICA PR: https://github.com/acpica/acpica/pull/804
Reference: Mantis: 2349

Cc: Robert Moore <robert.moore@intel.com>
Cc: acpica-devel@lists.linuxfoundation.org
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 include/acpi/actbl2.h | 47 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index abb700d246df..0715e937a453 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -47,6 +47,7 @@
 #define ACPI_SIG_PRMT           "PRMT"	/* Platform Runtime Mechanism Table */
 #define ACPI_SIG_RASF           "RASF"	/* RAS Feature table */
 #define ACPI_SIG_RGRT           "RGRT"	/* Regulatory Graphics Resource Table */
+#define ACPI_SIG_RHCT           "RHCT"  /* RISC-V Hart Capabilities Table */
 #define ACPI_SIG_SBST           "SBST"	/* Smart Battery Specification Table */
 #define ACPI_SIG_SDEI           "SDEI"	/* Software Delegated Exception Interface Table */
 #define ACPI_SIG_SDEV           "SDEV"	/* Secure Devices table */
@@ -2606,6 +2607,52 @@ enum acpi_rgrt_image_type {
 
 /*******************************************************************************
  *
+ * RHCT - RISC-V Hart Capabilities Table
+ *        Version 1
+ *
+ ******************************************************************************/
+
+struct acpi_table_rhct {
+	struct acpi_table_header        header;             /* Common ACPI table header */
+	u32                             reserved;
+	u64                             time_base_freq;
+	u32                             node_count;
+	u32                             node_offset;
+};
+
+/*
+ * RHCT subtables
+ */
+struct acpi_rhct_node_header {
+	u16                             type;
+	u16                             length;
+	u16                             revision;
+};
+
+/* Values for RHCT subtable Type above */
+
+enum acpi_rhct_node_type {
+	ACPI_RHCT_NODE_TYPE_ISA_STRING = 0x0000,
+	ACPI_RHCT_NODE_TYPE_HART_INFO  = 0xFFFF,
+};
+
+/*
+ * RHCT node specific subtables
+ */
+
+/* ISA string node structure */
+struct acpi_rhct_isa_string {
+	u16                             isa_length;
+	char                            isa[];
+};
+
+/* Hart Info node structure */
+struct acpi_rhct_hart_info {
+	u16                             num_offsets;
+	u32                             uid;                /* ACPI processor UID */
+};
+
+/*******************************************************************************
  * SBST - Smart Battery Specification Table
  *        Version 1
  *
-- 
2.34.1