Add IMSIC structure in MADT when IMSIC is configured.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Andrew Jones <ajones@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
---
 hw/riscv/virt-acpi-build.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/hw/riscv/virt-acpi-build.c b/hw/riscv/virt-acpi-build.c
index 073c85f327..7f1a370e54 100644
--- a/hw/riscv/virt-acpi-build.c
+++ b/hw/riscv/virt-acpi-build.c
@@ -281,8 +281,20 @@ static void build_madt(GArray *table_data,
     uint8_t  guest_index_bits;
     uint32_t imsic_size;
     uint32_t local_cpu_id, socket_id;
+    uint8_t  hart_index_bits, group_index_bits, group_index_shift;
+    uint16_t imsic_max_hart_per_socket = 0;
+    uint8_t  socket;
+
+    for (socket = 0; socket < riscv_socket_count(ms); socket++) {
+        if (imsic_max_hart_per_socket < s->soc[socket].num_harts) {
+            imsic_max_hart_per_socket = s->soc[socket].num_harts;
+        }
+    }
 
     guest_index_bits = imsic_num_bits(s->aia_guests + 1);
+    hart_index_bits = imsic_num_bits(imsic_max_hart_per_socket);
+    group_index_bits = imsic_num_bits(riscv_socket_count(ms));
+    group_index_shift = IMSIC_MMIO_GROUP_MIN_SHIFT;
 
     AcpiTable table = { .sig = "APIC", .rev = 6, .oem_id = s->oem_id,
                         .oem_table_id = s->oem_table_id };
@@ -307,6 +319,28 @@ static void build_madt(GArray *table_data,
                                   s->aia_type, imsic_addr, imsic_size);
     }
 
+    /* IMSIC */
+    if (s->aia_type == VIRT_AIA_TYPE_APLIC_IMSIC) {
+        /* IMSIC */
+        build_append_int_noprefix(table_data, 0x19, 1);     /* Type */
+        build_append_int_noprefix(table_data, 16, 1);       /* Length */
+        build_append_int_noprefix(table_data, 1, 1);        /* Version */
+        build_append_int_noprefix(table_data, 0, 1);        /* Reserved */
+        build_append_int_noprefix(table_data, 0, 4);        /* Flags */
+        /* Number of supervisor mode Interrupt Identities */
+        build_append_int_noprefix(table_data, VIRT_IRQCHIP_NUM_MSIS, 2);
+        /* Number of guest mode Interrupt Identities */
+        build_append_int_noprefix(table_data, VIRT_IRQCHIP_NUM_MSIS, 2);
+        /* Guest Index Bits */
+        build_append_int_noprefix(table_data, guest_index_bits, 1);
+        /* Hart Index Bits */
+        build_append_int_noprefix(table_data, hart_index_bits, 1);
+        /* Group Index Bits */
+        build_append_int_noprefix(table_data, group_index_bits, 1);
+        /* Group Index Shift */
+        build_append_int_noprefix(table_data, group_index_shift, 1);
+    }
+
     acpi_table_end(linker, &table);
 }
 
-- 
2.39.2