ACPICA: Add structure definitions for RISC-V RHCT

ACPICA commit 82afd0434e79f74b96a6be88115ddc8343a1ba40

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.

Link: acpica/acpica@82afd043
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

include/acpi/actbl2.h

@@ -48,6 +48,7 @@
 #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 */
@@ -2720,6 +2721,53 @@ enum acpi_rgrt_image_type {
 	ACPI_RGRT_TYPE_RESERVED = 2	/* 2 and greater are reserved */
 };
 
+/*******************************************************************************
+ *
+ * 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