[Qemu-devel] [PATCH v4 09/20] hw/arm/virt-acpi-build: Generate GTDT table

[Shannon Zhao <zhaoshenglong@huawei.com>]

From: Shannon Zhao <shannon.zhao@linaro.org>

ACPI v5.1 defines GTDT for ARM devices as a place to describe timer
related information in the system. The Arch Timer interrupts must
be provided for GTDT.

Signed-off-by: Shannon Zhao <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 hw/arm/virt-acpi-build.c    | 30 ++++++++++++++++++++++++++++++
 include/hw/acpi/acpi-defs.h | 37 +++++++++++++++++++++++++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index c8245ef..a7aba75 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -176,6 +176,33 @@ static void acpi_dsdt_add_virtio(Aml *scope, const hwaddr *mmio_addrs,
     }
 }
 
+/* GTDT */
+static void
+build_gtdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
+{
+    int gtdt_start = table_data->len;
+    const struct acpi_gtdt_info *info = guest_info->gtdt_info;
+    AcpiGenericTimerTable *gtdt;
+
+    gtdt = acpi_data_push(table_data, sizeof *gtdt);
+    /* The interrupt values are the same with the device tree when adding 16 */
+    gtdt->secure_el1_interrupt = info->timer_s_el1;
+    gtdt->secure_el1_flags = ACPI_EDGE_SENSITIVE;
+
+    gtdt->non_secure_el1_interrupt = info->timer_ns_el1;
+    gtdt->non_secure_el1_flags = ACPI_EDGE_SENSITIVE;
+
+    gtdt->virtual_timer_interrupt = info->timer_virt;
+    gtdt->virtual_timer_flags = ACPI_EDGE_SENSITIVE;
+
+    gtdt->non_secure_el2_interrupt = info->timer_ns_el2;
+    gtdt->non_secure_el2_flags = ACPI_EDGE_SENSITIVE;
+
+    build_header(linker, table_data,
+                 (void *)(table_data->data + gtdt_start), "GTDT",
+                 table_data->len - gtdt_start, 1);
+}
+
 /* MADT */
 static void
 build_madt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info,
@@ -318,6 +345,9 @@ void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
     acpi_add_table(table_offsets, tables_blob);
     build_madt(tables_blob, tables->linker, guest_info, &cpuinfo);
 
+    acpi_add_table(table_offsets, tables_blob);
+    build_gtdt(tables_blob, tables->linker, guest_info);
+
     /* Cleanup memory that's no longer used. */
     g_array_free(table_offsets, true);
 }
diff --git a/include/hw/acpi/acpi-defs.h b/include/hw/acpi/acpi-defs.h
index e343728..ee40a5e 100644
--- a/include/hw/acpi/acpi-defs.h
+++ b/include/hw/acpi/acpi-defs.h
@@ -318,6 +318,43 @@ struct AcpiMadtGenericDistributor {
 typedef struct AcpiMadtGenericDistributor AcpiMadtGenericDistributor;
 
 /*
+ * Generic Timer Description Table (GTDT)
+ */
+
+#define ACPI_GTDT_INTERRUPT_MODE        (1)
+#define ACPI_GTDT_INTERRUPT_POLARITY    (1<<1)
+#define ACPI_GTDT_ALWAYS_ON             (1<<2)
+
+/* Triggering */
+
+#define ACPI_LEVEL_SENSITIVE            (uint8_t) 0x00
+#define ACPI_EDGE_SENSITIVE             (uint8_t) 0x01
+
+/* Polarity */
+
+#define ACPI_ACTIVE_HIGH                (uint8_t) 0x00
+#define ACPI_ACTIVE_LOW                 (uint8_t) 0x01
+#define ACPI_ACTIVE_BOTH                (uint8_t) 0x02
+
+struct AcpiGenericTimerTable {
+    ACPI_TABLE_HEADER_DEF
+    uint64_t counter_block_addresss;
+    uint32_t reserved;
+    uint32_t secure_el1_interrupt;
+    uint32_t secure_el1_flags;
+    uint32_t non_secure_el1_interrupt;
+    uint32_t non_secure_el1_flags;
+    uint32_t virtual_timer_interrupt;
+    uint32_t virtual_timer_flags;
+    uint32_t non_secure_el2_interrupt;
+    uint32_t non_secure_el2_flags;
+    uint64_t counter_read_block_address;
+    uint32_t platform_timer_count;
+    uint32_t platform_timer_offset;
+} QEMU_PACKED;
+typedef struct AcpiGenericTimerTable AcpiGenericTimerTable;
+
+/*
  * HPET Description Table
  */
 struct Acpi20Hpet {
-- 
2.0.4