hw/arm/virt-acpi-build: Generation of DSDT table for virt devices

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 <zhaoshenglong@huawei.com>
Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1432522520-8068-8-git-send-email-zhaoshenglong@huawei.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 132 insertions, 0 deletions

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index b8a5bd83fd..2cf2cc5f09 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -40,6 +40,134 @@
 #include "hw/hw.h"
 #include "hw/acpi/aml-build.h"
 
+#define ARM_SPI_BASE 32
+
+static void acpi_dsdt_add_cpus(Aml *scope, int smp_cpus)
+{
+    uint16_t i;
+
+    for (i = 0; i < smp_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_append(scope, dev);
+    }
+}
+
+static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
+                                           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->base,
+                                       uart_memmap->size, AML_READ_WRITE));
+    aml_append(crs,
+               aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
+                             AML_EXCLUSIVE, uart_irq));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_rtc(Aml *scope, const MemMapEntry *rtc_memmap,
+                                          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->base,
+                                       rtc_memmap->size, AML_READ_WRITE));
+    aml_append(crs,
+               aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
+                             AML_EXCLUSIVE, rtc_irq));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_flash(Aml *scope, const MemMapEntry *flash_memmap)
+{
+    Aml *dev, *crs;
+    hwaddr base = flash_memmap->base;
+    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_READ_WRITE));
+    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_READ_WRITE));
+    aml_append(dev, aml_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_virtio(Aml *scope,
+                                 const MemMapEntry *virtio_mmio_memmap,
+                                 int mmio_irq, int num)
+{
+    hwaddr base = virtio_mmio_memmap->base;
+    hwaddr size = virtio_mmio_memmap->size;
+    int irq = mmio_irq;
+    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_READ_WRITE));
+        aml_append(crs,
+                   aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
+                                 AML_EXCLUSIVE, 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;
+    const MemMapEntry *memmap = guest_info->memmap;
+    const int *irqmap = guest_info->irqmap;
+
+    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->smp_cpus);
+    acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
+                       (irqmap[VIRT_UART] + ARM_SPI_BASE));
+    acpi_dsdt_add_rtc(scope, &memmap[VIRT_RTC],
+                      (irqmap[VIRT_RTC] + ARM_SPI_BASE));
+    acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]);
+    acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
+                    (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
+    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, 5);
+    free_aml_allocator();
+}
+
 typedef
 struct AcpiBuildState {
     /* Copy of table in RAM (for patching). */
@@ -55,6 +183,7 @@ 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));
@@ -72,6 +201,9 @@ 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);
 }