[Qemu-devel] [RFC PATCH 10/11] 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.

The following devices are included in the DSDT:
- CPUs
- UART
- RTC
- NAND Flash
- virtio-mmio

Signed-off-by: Shannon Zhao <address@hidden>
---
 hw/arm/virt-acpi-build.c |  120 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 120 insertions(+), 0 deletions(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index de1f307..5c76ca2 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -98,6 +98,111 @@ static inline void acpi_add_table(GArray *table_offsets, 
GArray *table_data)
     g_array_append_val(table_offsets, offset);
 }
 
+static void acpi_dsdt_add_cpus(AcpiAml *scope, int smp_cpus)
+{
+    AcpiAml dev, crs;
+    int i;
+    char name[5];
+    for (i = 0; i < smp_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_fixed_memory32(uart_addr[0], uart_addr[1], 0x01));
+    aml_append(&crs,
+               acpi_extended_irq(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_fixed_memory32(rtc_addr[0], rtc_addr[1], 0x01));
+    aml_append(&crs,
+               acpi_extended_irq(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_fixed_memory32(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_fixed_memory32(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_fixed_memory32(base, size, 0x01));
+        aml_append(&crs,
+                   acpi_extended_irq(0x01, irq + i));
+        aml_append(&dev, acpi_name_decl("_CRS", crs));
+        aml_append(scope, dev);
+        base += size;
+    }
+}
+
 /* RSDP */
 static GArray *
 build_rsdp(GArray *rsdp_table, GArray *linker, uint64_t xsdt)
@@ -260,6 +365,21 @@ build_facs(GArray *table_data, GArray *linker, 
VirtGuestInfo *guest_info)
 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_VIRT_QEMU_STR_4,
+                                     ACPI_VIRT_MACH_STR_8, 1);
+    scope = acpi_scope("\\_SB");
+    acpi_dsdt_add_cpus(&scope, guest_info->nb_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
-- 
1.7.1