[PATCH V3 6/8] hw/riscv/virt: virt-acpi-build.c: Add RHCT Table

[Sunil V L <sunilvl@ventanamicro.com>]

RISC-V ACPI platforms need to provide RISC-V Hart Capabilities
Table (RHCT). Add this to the ACPI tables.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
---
 hw/riscv/virt-acpi-build.c | 76 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)

diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c
index 58e49cd6d6..ef6990582d 100644
--- a/hw/riscv/virt-acpi-build.c
+++ b/hw/riscv/virt-acpi-build.c
@@ -33,6 +33,7 @@
 #include "migration/vmstate.h"
 #include "hw/riscv/virt.h"
 #include "hw/riscv/numa.h"
+#include "hw/intc/riscv_aclint.h"
 
 #define ACPI_BUILD_TABLE_SIZE             0x20000
 
@@ -74,6 +75,78 @@ static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
     aml_append(scope, dev);
 }
 
+#define RHCT_NODE_ARRAY_OFFSET 56
+static void build_rhct(GArray *table_data,
+                       BIOSLinker *linker,
+                       RISCVVirtState *s)
+{
+    MachineState *ms = MACHINE(s);
+    uint32_t acpi_proc_id = 0;
+    int i, socket;
+    RISCVCPU *cpu;
+    char *isa;
+    size_t len, aligned_len;
+    uint32_t isa_offset, num_rhct_nodes;
+
+    AcpiTable table = { .sig = "RHCT", .rev = 1, .oem_id = s->oem_id,
+                        .oem_table_id = s->oem_table_id };
+
+    acpi_table_begin(&table, table_data);
+
+    build_append_int_noprefix(table_data, 0x0, 4);   /* Reserved */
+
+    /* Time Base Frequency */
+    build_append_int_noprefix(table_data,
+                              RISCV_ACLINT_DEFAULT_TIMEBASE_FREQ, 8);
+
+    /* ISA + N hart info */
+    num_rhct_nodes = 1 + ms->smp.cpus;
+
+    /* Number of RHCT nodes*/
+    build_append_int_noprefix(table_data, num_rhct_nodes, 4);
+
+    /* Offset to the RHCT node array */
+    build_append_int_noprefix(table_data, RHCT_NODE_ARRAY_OFFSET, 4);
+
+    /* ISA string node */
+    isa_offset = table_data->len - table.table_offset;
+    build_append_int_noprefix(table_data, 0, 2);   /* Type 0 */
+
+    cpu = &s->soc[0].harts[0];
+    isa = riscv_isa_string(cpu);
+    len = 8 + strlen(isa) + 1;
+    aligned_len = (len % 2) ? (len + 1) : len;
+
+    build_append_int_noprefix(table_data, aligned_len, 2);   /* Length */
+    build_append_int_noprefix(table_data, 0x1, 2);           /* Revision */
+
+    /* ISA string length including NUL */
+    build_append_int_noprefix(table_data, strlen(isa) + 1, 2);
+    g_array_append_vals(table_data, isa, strlen(isa) + 1);   /* ISA string */
+
+    if (aligned_len != len) {
+        build_append_int_noprefix(table_data, 0x0, 1);   /* Optional Padding */
+    }
+
+    for (socket = 0; socket < riscv_socket_count(ms); socket++) {
+        for (i = 0; i < s->soc[socket].num_harts; i++) {
+            build_append_int_noprefix(table_data, 0xFFFF, 2);  /* Type */
+            build_append_int_noprefix(table_data, 16, 2);      /* Length */
+            build_append_int_noprefix(table_data, 0x1, 2);     /* Revision */
+            build_append_int_noprefix(table_data, 1, 2); /* Number of offsets */
+
+            /* ACPI Processor UID */
+            build_append_int_noprefix(table_data, acpi_proc_id, 4);
+
+            /* Offsets[0] */
+            build_append_int_noprefix(table_data, isa_offset, 4);
+            acpi_proc_id++;
+        }
+    }
+
+    acpi_table_end(linker, &table);
+}
+
 /* FADT */
 static void build_fadt_rev6(GArray *table_data,
                             BIOSLinker *linker,
@@ -188,6 +261,9 @@ static void virt_acpi_build(RISCVVirtState *s, AcpiBuildTables *tables)
     acpi_add_table(table_offsets, tables_blob);
     build_madt(tables_blob, tables->linker, s);
 
+    acpi_add_table(table_offsets, tables_blob);
+    build_rhct(tables_blob, tables->linker, s);
+
     /* XSDT is pointed to by RSDP */
     xsdt = tables_blob->len;
     build_xsdt(tables_blob, tables->linker, table_offsets, s->oem_id,
-- 
2.34.1