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authorShannon Zhao <shannon.zhao@linaro.org>2016-01-15 22:11:31 +0800
committerPeter Maydell <peter.maydell@linaro.org>2016-01-15 14:55:16 +0000
commit67736a25f86595c8ae174a21d965af5a027884c9 (patch)
tree8401eae5b86ae112ee3504e0dbb35d3951217868 /hw/arm/virt-acpi-build.c
parentade0d0c0d3a0444c626ec5f46ef75af7395236f6 (diff)
ARM: virt: Don't generate RTC ACPI device when using UEFI
When booting the VM with UEFI, UEFI takes ownership of the RTC hardware. While UEFI can use libfdt to disable the RTC device node in the DTB that it passes to the OS, it cannot modify AML. Therefore, we won't generate the RTC ACPI device at all when using UEFI. Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Andrew Jones <drjones@redhat.com> Message-id: 1452867091-4023-1-git-send-email-shannon.zhao@linaro.org Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/arm/virt-acpi-build.c')
-rw-r--r--hw/arm/virt-acpi-build.c24
1 files changed, 5 insertions, 19 deletions
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index 0caf5ced69..0d5c635cc8 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -94,23 +94,6 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
aml_append(scope, dev);
}
-static void acpi_dsdt_add_rtc(Aml *scope, const MemMapEntry *rtc_memmap,
- uint32_t 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, 1));
- 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;
@@ -571,12 +554,15 @@ build_dsdt(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
/* Reserve space for header */
acpi_data_push(dsdt->buf, sizeof(AcpiTableHeader));
+ /* When booting the VM with UEFI, UEFI takes ownership of the RTC hardware.
+ * While UEFI can use libfdt to disable the RTC device node in the DTB that
+ * it passes to the OS, it cannot modify AML. Therefore, we won't generate
+ * the RTC ACPI device at all when using UEFI.
+ */
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);