[Qemu-devel] [RFC PATCH v2 05/11] hw/arm/virt-acpi-build: Generation of DSDT table for virt devices

[Shannon Zhao]

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>
---
 hw/arm/virt-acpi-build.c |  131 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 131 insertions(+), 0 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 2f72b1e..8560dae 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -57,6 +57,132 @@
 #define ACPI_BUILD_DPRINTF(fmt, ...)
 #endif
 
+static void acpi_dsdt_add_cpus(AcpiAml *scope, int max_cpus)
+{
+    AcpiAml dev, crs;
+    int i;
+    char name[5];
+    for (i = 0; i < max_cpus; i++) {
+        snprintf(name, 5, "CPU%u", i);
+        dev = acpi_device("%s", name);
+        aml_append(&dev, acpi_name_decl("_HID", acpi_string("ACPI007")));
+        aml_append(&dev, acpi_name_decl("_UID", acpi_int(i)));
+        crs = acpi_resource_template();
+        aml_append(&dev, acpi_name_decl("_CRS", crs));
+        aml_append(scope, dev);
+    }
+}
+
+static void acpi_dsdt_add_uart(AcpiAml *scope, const hwaddr *uart_addr,
+                                               const int *uart_irq)
+{
+    AcpiAml dev, crs;
+
+    dev = acpi_device("COM0");
+    aml_append(&dev, acpi_name_decl("_HID", acpi_string("ARMH0011")));
+    aml_append(&dev, acpi_name_decl("_UID", acpi_int(0)));
+
+    crs = acpi_resource_template();
+    aml_append(&crs,
+               acpi_memory32_fixed(uart_addr[0], uart_addr[1], 0x01));
+    aml_append(&crs,
+               acpi_interrupt(0x01, *uart_irq + 32));
+    aml_append(&dev, acpi_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_rtc(AcpiAml *scope, const hwaddr *rtc_addr,
+                                              const int *rtc_irq)
+{
+    AcpiAml dev, crs;
+
+    dev = acpi_device("RTC0");
+    aml_append(&dev, acpi_name_decl("_HID", acpi_string("LNRO0013")));
+    aml_append(&dev, acpi_name_decl("_UID", acpi_int(0)));
+
+    crs = acpi_resource_template();
+    aml_append(&crs,
+               acpi_memory32_fixed(rtc_addr[0], rtc_addr[1], 0x01));
+    aml_append(&crs,
+               acpi_interrupt(0x01, *rtc_irq + 32));
+    aml_append(&dev, acpi_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_flash(AcpiAml *scope, const hwaddr *flash_addr)
+{
+    AcpiAml dev, crs;
+    hwaddr base = flash_addr[0];
+    hwaddr size = flash_addr[1];
+
+    dev = acpi_device("FLS0");
+    aml_append(&dev, acpi_name_decl("_HID", acpi_string("LNRO0015")));
+    aml_append(&dev, acpi_name_decl("_UID", acpi_int(0)));
+
+    crs = acpi_resource_template();
+    aml_append(&crs,
+               acpi_memory32_fixed(base, size, 0x01));
+    aml_append(&dev, acpi_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+
+    dev = acpi_device("FLS1");
+    aml_append(&dev, acpi_name_decl("_HID", acpi_string("LNRO0015")));
+    aml_append(&dev, acpi_name_decl("_UID", acpi_int(1)));
+    crs = acpi_resource_template();
+    aml_append(&crs,
+               acpi_memory32_fixed(base + size, size, 0x01));
+    aml_append(&dev, acpi_name_decl("_CRS", crs));
+    aml_append(scope, dev);
+}
+
+static void acpi_dsdt_add_virtio(AcpiAml *scope, const hwaddr *mmio_addrs,
+                                                 const int *mmio_irq, int num)
+{
+    AcpiAml dev, crs;
+    hwaddr base = mmio_addrs[0];
+    hwaddr size = mmio_addrs[1];
+    int irq = *mmio_irq + 32;
+    int i;
+    char name[5];
+
+    for (i = 0; i < num; i++) {
+        snprintf(name, 5, "VR%02u", i);
+        dev = acpi_device("%s", name);
+        aml_append(&dev, acpi_name_decl("_HID", acpi_string("LNRO0005")));
+        aml_append(&dev, acpi_name_decl("_UID", acpi_int(i)));
+
+        crs = acpi_resource_template();
+        aml_append(&crs,
+                   acpi_memory32_fixed(base, size, 0x01));
+        aml_append(&crs,
+                   acpi_interrupt(0x01, irq + i));
+        aml_append(&dev, acpi_name_decl("_CRS", crs));
+        aml_append(scope, dev);
+        base += size;
+    }
+}
+
+/* DSDT */
+static void
+build_dsdt(AcpiAml *table_aml, GArray *linker, VirtGuestInfo *guest_info)
+{
+    AcpiAml scope, dsdt;
+    const struct acpi_dsdt_info *info = guest_info->dsdt_info;
+
+    dsdt = acpi_def_block("DSDT", 1, ACPI_BUILD_APPNAME6,
+                           ACPI_BUILD_APPNAME4, 1, ACPI_BUILD_APPNAME4);
+    scope = acpi_scope("\\_SB");
+    acpi_dsdt_add_cpus(&scope, guest_info->max_cpus);
+    acpi_dsdt_add_uart(&scope, info->uart_addr, info->uart_irq);
+    acpi_dsdt_add_rtc(&scope, info->rtc_addr, info->rtc_irq);
+    acpi_dsdt_add_flash(&scope, info->flash_addr);
+    acpi_dsdt_add_virtio(&scope, info->virtio_mmio_addr,
+             info->virtio_mmio_irq, info->virtio_mmio_num);
+
+    aml_append(&dsdt, scope);
+    aml_append(table_aml, dsdt);
+}
+
 typedef
 struct AcpiBuildState {
     /* Copy of table in RAM (for patching). */
@@ -75,6 +201,7 @@ static
 void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
 {
     GArray *table_offsets;
+    unsigned dsdt;
 
     table_offsets = g_array_new(false, true /* clear */,
                                         sizeof(uint64_t));
@@ -92,6 +219,10 @@ void virt_acpi_build(VirtGuestInfo *guest_info, 
AcpiBuildTables *tables)
      * DSDT
      */
 
+    /* DSDT is pointed to by FADT */
+    dsdt = tables->table_data.buf->len;
+    build_dsdt(&tables->table_data, tables->linker, guest_info);
+
     /* Cleanup memory that's no longer used. */
     g_array_free(table_offsets, true);
 }
-- 
1.7.1