[Qemu-devel] [PATCH v5 06/20] hw/arm/virt-acpi-build: Generation of DSDT table for virt devices

[Shannon Zhao]

From: Shannon Zhao <address@hidden>

DSDT consists of the usual common table header plus a definition
block in AML encoding which describes all devices in the platform.

After initializing DSDT with header information the namespace is
created which is followed by the device encodings. The devices are
described using the Resource Template for the 32-Bit Fixed Memory
Range and the Extended Interrupt Descriptors.

Signed-off-by: Shannon Zhao <address@hidden>
Signed-off-by: Shannon Zhao <address@hidden>
---
 hw/arm/virt-acpi-build.c | 128 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index c5a3cf9..d044880 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -50,6 +50,130 @@
 #include "qom/qom-qobject.h"
 #include "exec/ram_addr.h"
 
+static void acpi_dsdt_add_cpus(Aml *scope, int max_cpus)
+{
+    uint16_t i;
+
+    for (i = 0; i < max_cpus; i++) {
+        Aml *dev = aml_device("C%03x", i);
+        aml_append(dev, aml_name_decl("_HID", aml_string("ACPI0007")));
+        aml_append(dev, aml_name_decl("_UID", aml_int(i)));
+        Aml *crs = aml_resource_template();
+        aml_append(dev, aml_name_decl("_CRS", crs));
+        aml_append(scope, dev);
+    }
+}
+
+static void acpi_dsdt_add_uart(Aml *scope, const MemMap *uart_memmap,
+                                           const int *uart_irq)
+{
+    Aml *dev = aml_device("COM0");
+    aml_append(dev, aml_name_decl("_HID", aml_string("ARMH0011")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+
+    Aml *crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(uart_memmap->addr,
+                                       uart_memmap->size, aml_ReadWrite));
+    aml_append(crs,
+               aml_interrupt(aml_consumer, aml_level, aml_active_high,
+               aml_exclusive, aml_not_wake_capable, *uart_irq + 32));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_rtc(Aml *scope, const MemMap *rtc_memmap,
+                                          const int *rtc_irq)
+{
+    Aml *dev = aml_device("RTC0");
+    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0013")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+
+    Aml *crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(rtc_memmap->addr,
+                                       rtc_memmap->size, aml_ReadWrite));
+    aml_append(crs,
+               aml_interrupt(aml_consumer, aml_level, aml_active_high,
+               aml_exclusive, aml_not_wake_capable, *rtc_irq + 32));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_flash(Aml *scope, const MemMap *flash_memmap)
+{
+    Aml *dev, *crs;
+    hwaddr base = flash_memmap->addr;
+    hwaddr size = flash_memmap->size;
+
+    dev = aml_device("FLS0");
+    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(0)));
+
+    crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(base, size, aml_ReadWrite));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+
+    dev = aml_device("FLS1");
+    aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0015")));
+    aml_append(dev, aml_name_decl("_UID", aml_int(1)));
+    crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(base + size, size, aml_ReadWrite));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_virtio(Aml *scope, const MemMap *virtio_mmio_memmap,
+                                             const int *mmio_irq, int num)
+{
+    hwaddr base = virtio_mmio_memmap->addr;
+    hwaddr size = virtio_mmio_memmap->size;
+    int irq = *mmio_irq + 32;
+    int i;
+
+    for (i = 0; i < num; i++) {
+        Aml *dev = aml_device("VR%02u", i);
+        aml_append(dev, aml_name_decl("_HID", aml_string("LNRO0005")));
+        aml_append(dev, aml_name_decl("_UID", aml_int(i)));
+
+        Aml *crs = aml_resource_template();
+        aml_append(crs, aml_memory32_fixed(base, size, aml_ReadWrite));
+        aml_append(crs,
+                   aml_interrupt(aml_consumer, aml_level, aml_active_high,
+                   aml_exclusive, aml_not_wake_capable, irq + i));
+        aml_append(dev, aml_name_decl("_CRS", crs));
+        aml_append(scope, dev);
+        base += size;
+    }
+}
+
+/* DSDT */
+static void
+build_dsdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
+{
+    Aml *scope, *dsdt;
+    AcpiDsdtInfo *info = guest_info->dsdt_info;
+
+    dsdt = init_aml_allocator();
+    /* Reserve space for header */
+    acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader));
+
+    scope = aml_scope("\\_SB");
+    acpi_dsdt_add_cpus(scope, guest_info->max_cpus);
+    acpi_dsdt_add_uart(scope, info->uart_memmap, info->uart_irq);
+    acpi_dsdt_add_rtc(scope, info->rtc_memmap, info->rtc_irq);
+    acpi_dsdt_add_flash(scope, info->flash_memmap);
+    acpi_dsdt_add_virtio(scope, info->virtio_mmio_memmap,
+             info->virtio_mmio_irq, info->virtio_mmio_num);
+    aml_append(dsdt, scope);
+
+    /* copy AML table into ACPI tables blob and patch header there */
+    g_array_append_vals(table_data, dsdt->buf->data, dsdt->buf->len);
+    build_header(linker, table_data,
+        (void *)(table_data->data + table_data->len - dsdt->buf->len),
+        "DSDT", dsdt->buf->len, 1);
+    free_aml_allocator();
+}
+
 typedef
 struct AcpiBuildState {
     /* Copy of table in RAM (for patching). */
@@ -65,6 +189,7 @@ static
 void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
 {
     GArray *table_offsets;
+    GArray *tables_blob = tables->table_data;
 
     table_offsets = g_array_new(false, true /* clear */,
                                         sizeof(uint32_t));
@@ -82,6 +207,9 @@ void virt_acpi_build(VirtGuestInfo *guest_info, 
AcpiBuildTables *tables)
      * DSDT
      */
 
+    /* DSDT is pointed to by FADT */
+    build_dsdt(tables_blob, tables->linker, guest_info);
+
     /* Cleanup memory that's no longer used. */
     g_array_free(table_offsets, true);
 }
-- 
2.0.4