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[Qemu-arm] [PATCH v7 4/5] acpi: arm: add fw_cfg device node to dsdt

From: Gabriel L. Somlo
Subject: [Qemu-arm] [PATCH v7 4/5] acpi: arm: add fw_cfg device node to dsdt
Date: Wed, 10 Feb 2016 15:41:39 -0500

Add a fw_cfg device node to the ACPI DSDT. This is mostly
informational, as the authoritative fw_cfg MMIO region(s)
are listed in the Device Tree. However, since we are building
ACPI tables, we might as well be thorough while at it...

Signed-off-by: Gabriel Somlo <address@hidden>
Reviewed-by: Laszlo Ersek <address@hidden>
Tested-by: Laszlo Ersek <address@hidden>
Reviewed-by: Marc MarĂ­ <address@hidden>
 hw/arm/virt-acpi-build.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 8cf9a21..7d7998b 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -81,6 +81,20 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry 
     aml_append(scope, dev);
+static void acpi_dsdt_add_fw_cfg(Aml *scope, const MemMapEntry *fw_cfg_memmap)
+    Aml *dev = aml_device("FWCF");
+    aml_append(dev, aml_name_decl("_HID", aml_string("QEMU0002")));
+    /* device present, functioning, decoding, not shown in UI */
+    aml_append(dev, aml_name_decl("_STA", aml_int(0xB)));
+    Aml *crs = aml_resource_template();
+    aml_append(crs, aml_memory32_fixed(fw_cfg_memmap->base,
+                                       fw_cfg_memmap->size, AML_READ_WRITE));
+    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;
@@ -548,6 +562,7 @@ build_dsdt(GArray *table_data, GArray *linker, 
VirtGuestInfo *guest_info)
     acpi_dsdt_add_uart(scope, &memmap[VIRT_UART],
                        (irqmap[VIRT_UART] + ARM_SPI_BASE));
     acpi_dsdt_add_flash(scope, &memmap[VIRT_FLASH]);
+    acpi_dsdt_add_fw_cfg(scope, &memmap[VIRT_FW_CFG]);
     acpi_dsdt_add_virtio(scope, &memmap[VIRT_MMIO],
                     (irqmap[VIRT_MMIO] + ARM_SPI_BASE), NUM_VIRTIO_TRANSPORTS);
     acpi_dsdt_add_pci(scope, memmap, (irqmap[VIRT_PCIE] + ARM_SPI_BASE),

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