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	val_packett.cool
	Jun 10 2020, 12:40 AM

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	--- i/sys/dev/acpica/acpi.c
	+++ w/sys/dev/acpica/acpi.c
	@@ -183,6 +183,7 @@ static void acpi_enable_pcie(void);
	static void acpi_hint_device_unit(device_t acdev, device_t child,
	const char name, int unitp);
	static void acpi_reset_interfaces(device_t dev);
	+static bus_dma_tag_t acpi_get_dma_tag(device_t dev, device_t child);

	static device_method_t acpi_methods[] = {
	/* Device interface */
	@@ -217,6 +218,7 @@ static device_method_t acpi_methods[] = {
	DEVMETHOD(bus_hint_device_unit, acpi_hint_device_unit),
	DEVMETHOD(bus_get_cpus, acpi_get_cpus),
	DEVMETHOD(bus_get_domain, acpi_get_domain),
	+ DEVMETHOD(bus_get_dma_tag, acpi_get_dma_tag),

	/* ACPI bus */
	DEVMETHOD(acpi_id_probe, acpi_device_id_probe),
	@@ -430,6 +432,25 @@ acpi_identify(void)
	return (0);
	}

	+static bus_dma_tag_t
	+acpi_get_dma_tag(device_t dev, device_t child)
	+{
	+ bus_dma_tag_t result;
	+
	+ // TODO: get acpi handle of child, walk up the dsdt and get _DMA (and _CCA) data
	+ // like NetBSD: https://github.com/NetBSD/src/blob/792df501ab0f93d73372a9bc2c7f19ccb733c1e5/sys/arch/arm/acpi/acpi_machdep.c#L400
	+
	+ if (bus_dma_tag_create(bus_get_dma_tag(dev), 1, 0,
	+ 0xbfffffff /* 3GB */, BUS_SPACE_MAXADDR, NULL, NULL,
	+ BUS_SPACE_MAXSIZE, BUS_SPACE_UNRESTRICTED, BUS_SPACE_MAXSIZE,
	+ /* BUS_DMA_COHERENT */ 0, NULL, NULL,
	+ &result)) {
	+ printf("disaster\n");
	+ }
	+
	+ return (result);
	+}
	+
	/*
	* Fetch some descriptive data from ACPI to put in our attach message.
	*/