check in the original version of dde linux26.

7 files changed, 904 insertions, 0 deletions

diff --git a/libdde_linux26/contrib/arch/x86/kernel/.svn/all-wcprops b/libdde_linux26/contrib/arch/x86/kernel/.svn/all-wcprops
new file mode 100644
index 00000000..7224325c
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/.svn/all-wcprops
@@ -0,0 +1,17 @@
+K 25
+svn:wc:ra_dav:version-url
+V 74
+/repos/tudos/!svn/ver/455/trunk/l4/pkg/dde/linux26/contrib/arch/x86/kernel
+END
+pci-nommu.c
+K 25
+svn:wc:ra_dav:version-url
+V 86
+/repos/tudos/!svn/ver/455/trunk/l4/pkg/dde/linux26/contrib/arch/x86/kernel/pci-nommu.c
+END
+pci-dma.c
+K 25
+svn:wc:ra_dav:version-url
+V 84
+/repos/tudos/!svn/ver/455/trunk/l4/pkg/dde/linux26/contrib/arch/x86/kernel/pci-dma.c
+END
diff --git a/libdde_linux26/contrib/arch/x86/kernel/.svn/entries b/libdde_linux26/contrib/arch/x86/kernel/.svn/entries
new file mode 100644
index 00000000..b22df5fc
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/.svn/entries
@@ -0,0 +1,96 @@
+9
+
+dir
+465
+http://svn.tudos.org/repos/tudos/trunk/l4/pkg/dde/linux26/contrib/arch/x86/kernel
+http://svn.tudos.org/repos/tudos
+
+
+
+2009-05-20T14:32:55.606606Z
+455
+l4check
+
+
+svn:special svn:externals svn:needs-lock
+
+
+
+
+
+
+
+
+
+
+
+a704ac0b-3a55-4d43-a2a9-7be6f07c34fb
+
+pci-nommu.c
+file
+
+
+
+
+2009-11-15T17:16:39.000000Z
+df22292949f11091b904521231845194
+2009-05-20T14:32:55.606606Z
+455
+l4check
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+2602
+
+pci-dma.c
+file
+
+
+
+
+2009-11-15T17:16:39.000000Z
+b3c9c6ff910894aa73a8d2ee1faaaae6
+2009-05-20T14:32:55.606606Z
+455
+l4check
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+6573
+
diff --git a/libdde_linux26/contrib/arch/x86/kernel/.svn/format b/libdde_linux26/contrib/arch/x86/kernel/.svn/format
new file mode 100644
index 00000000..ec635144
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/.svn/format
@@ -0,0 +1 @@
+9
diff --git a/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-dma.c.svn-base b/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-dma.c.svn-base
new file mode 100644
index 00000000..b2542853
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-dma.c.svn-base
@@ -0,0 +1,299 @@
+#include <linux/dma-mapping.h>
+#include <linux/dmar.h>
+#include <linux/bootmem.h>
+#include <linux/pci.h>
+
+#include <asm/proto.h>
+#include <asm/dma.h>
+#include <asm/iommu.h>
+#include <asm/gart.h>
+#include <asm/calgary.h>
+#include <asm/amd_iommu.h>
+
+static int forbid_dac __read_mostly;
+
+struct dma_mapping_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static int iommu_sac_force __read_mostly;
+
+#ifdef CONFIG_IOMMU_DEBUG
+int panic_on_overflow __read_mostly = 1;
+int force_iommu __read_mostly = 1;
+#else
+int panic_on_overflow __read_mostly = 0;
+int force_iommu __read_mostly = 0;
+#endif
+
+int iommu_merge __read_mostly = 0;
+
+int no_iommu __read_mostly;
+/* Set this to 1 if there is a HW IOMMU in the system */
+int iommu_detected __read_mostly = 0;
+
+dma_addr_t bad_dma_address __read_mostly = 0;
+EXPORT_SYMBOL(bad_dma_address);
+
+/* Dummy device used for NULL arguments (normally ISA). Better would
+   be probably a smaller DMA mask, but this is bug-to-bug compatible
+   to older i386. */
+struct device x86_dma_fallback_dev = {
+	.init_name = "fallback device",
+	.coherent_dma_mask = DMA_32BIT_MASK,
+	.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
+};
+EXPORT_SYMBOL(x86_dma_fallback_dev);
+
+int dma_set_mask(struct device *dev, u64 mask)
+{
+	if (!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+
+	*dev->dma_mask = mask;
+
+	return 0;
+}
+EXPORT_SYMBOL(dma_set_mask);
+
+#ifdef CONFIG_X86_64
+static __initdata void *dma32_bootmem_ptr;
+static unsigned long dma32_bootmem_size __initdata = (128ULL<<20);
+
+static int __init parse_dma32_size_opt(char *p)
+{
+	if (!p)
+		return -EINVAL;
+	dma32_bootmem_size = memparse(p, &p);
+	return 0;
+}
+early_param("dma32_size", parse_dma32_size_opt);
+
+void __init dma32_reserve_bootmem(void)
+{
+	unsigned long size, align;
+	if (max_pfn <= MAX_DMA32_PFN)
+		return;
+
+	/*
+	 * check aperture_64.c allocate_aperture() for reason about
+	 * using 512M as goal
+	 */
+	align = 64ULL<<20;
+	size = roundup(dma32_bootmem_size, align);
+	dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
+				 512ULL<<20);
+	if (dma32_bootmem_ptr)
+		dma32_bootmem_size = size;
+	else
+		dma32_bootmem_size = 0;
+}
+static void __init dma32_free_bootmem(void)
+{
+
+	if (max_pfn <= MAX_DMA32_PFN)
+		return;
+
+	if (!dma32_bootmem_ptr)
+		return;
+
+	free_bootmem(__pa(dma32_bootmem_ptr), dma32_bootmem_size);
+
+	dma32_bootmem_ptr = NULL;
+	dma32_bootmem_size = 0;
+}
+#endif
+
+void __init pci_iommu_alloc(void)
+{
+#ifdef CONFIG_X86_64
+	/* free the range so iommu could get some range less than 4G */
+	dma32_free_bootmem();
+#endif
+
+	/*
+	 * The order of these functions is important for
+	 * fall-back/fail-over reasons
+	 */
+	gart_iommu_hole_init();
+
+	detect_calgary();
+
+	detect_intel_iommu();
+
+	amd_iommu_detect();
+
+	pci_swiotlb_init();
+}
+
+void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+				 dma_addr_t *dma_addr, gfp_t flag)
+{
+	unsigned long dma_mask;
+	struct page *page;
+	dma_addr_t addr;
+
+	dma_mask = dma_alloc_coherent_mask(dev, flag);
+
+	flag |= __GFP_ZERO;
+again:
+	page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
+	if (!page)
+		return NULL;
+
+	addr = page_to_phys(page);
+	if (!is_buffer_dma_capable(dma_mask, addr, size)) {
+		__free_pages(page, get_order(size));
+
+		if (dma_mask < DMA_32BIT_MASK && !(flag & GFP_DMA)) {
+			flag = (flag & ~GFP_DMA32) | GFP_DMA;
+			goto again;
+		}
+
+		return NULL;
+	}
+
+	*dma_addr = addr;
+	return page_address(page);
+}
+
+/*
+ * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
+ * documentation.
+ */
+static __init int iommu_setup(char *p)
+{
+	iommu_merge = 1;
+
+	if (!p)
+		return -EINVAL;
+
+	while (*p) {
+		if (!strncmp(p, "off", 3))
+			no_iommu = 1;
+		/* gart_parse_options has more force support */
+		if (!strncmp(p, "force", 5))
+			force_iommu = 1;
+		if (!strncmp(p, "noforce", 7)) {
+			iommu_merge = 0;
+			force_iommu = 0;
+		}
+
+		if (!strncmp(p, "biomerge", 8)) {
+			iommu_merge = 1;
+			force_iommu = 1;
+		}
+		if (!strncmp(p, "panic", 5))
+			panic_on_overflow = 1;
+		if (!strncmp(p, "nopanic", 7))
+			panic_on_overflow = 0;
+		if (!strncmp(p, "merge", 5)) {
+			iommu_merge = 1;
+			force_iommu = 1;
+		}
+		if (!strncmp(p, "nomerge", 7))
+			iommu_merge = 0;
+		if (!strncmp(p, "forcesac", 8))
+			iommu_sac_force = 1;
+		if (!strncmp(p, "allowdac", 8))
+			forbid_dac = 0;
+		if (!strncmp(p, "nodac", 5))
+			forbid_dac = -1;
+		if (!strncmp(p, "usedac", 6)) {
+			forbid_dac = -1;
+			return 1;
+		}
+#ifdef CONFIG_SWIOTLB
+		if (!strncmp(p, "soft", 4))
+			swiotlb = 1;
+#endif
+
+		gart_parse_options(p);
+
+#ifdef CONFIG_CALGARY_IOMMU
+		if (!strncmp(p, "calgary", 7))
+			use_calgary = 1;
+#endif /* CONFIG_CALGARY_IOMMU */
+
+		p += strcspn(p, ",");
+		if (*p == ',')
+			++p;
+	}
+	return 0;
+}
+early_param("iommu", iommu_setup);
+
+int dma_supported(struct device *dev, u64 mask)
+{
+	struct dma_mapping_ops *ops = get_dma_ops(dev);
+
+#ifdef CONFIG_PCI
+	if (mask > 0xffffffff && forbid_dac > 0) {
+		dev_info(dev, "PCI: Disallowing DAC for device\n");
+		return 0;
+	}
+#endif
+
+	if (ops->dma_supported)
+		return ops->dma_supported(dev, mask);
+
+	/* Copied from i386. Doesn't make much sense, because it will
+	   only work for pci_alloc_coherent.
+	   The caller just has to use GFP_DMA in this case. */
+	if (mask < DMA_24BIT_MASK)
+		return 0;
+
+	/* Tell the device to use SAC when IOMMU force is on.  This
+	   allows the driver to use cheaper accesses in some cases.
+
+	   Problem with this is that if we overflow the IOMMU area and
+	   return DAC as fallback address the device may not handle it
+	   correctly.
+
+	   As a special case some controllers have a 39bit address
+	   mode that is as efficient as 32bit (aic79xx). Don't force
+	   SAC for these.  Assume all masks <= 40 bits are of this
+	   type. Normally this doesn't make any difference, but gives
+	   more gentle handling of IOMMU overflow. */
+	if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) {
+		dev_info(dev, "Force SAC with mask %Lx\n", mask);
+		return 0;
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(dma_supported);
+
+static int __init pci_iommu_init(void)
+{
+	calgary_iommu_init();
+
+	intel_iommu_init();
+
+	amd_iommu_init();
+
+	gart_iommu_init();
+
+	no_iommu_init();
+	return 0;
+}
+
+void pci_iommu_shutdown(void)
+{
+	gart_iommu_shutdown();
+}
+/* Must execute after PCI subsystem */
+fs_initcall(pci_iommu_init);
+
+#ifdef CONFIG_PCI
+/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
+
+static __devinit void via_no_dac(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+		printk(KERN_INFO
+			"PCI: VIA PCI bridge detected. Disabling DAC.\n");
+		forbid_dac = 1;
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+#endif
diff --git a/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-nommu.c.svn-base b/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-nommu.c.svn-base
new file mode 100644
index 00000000..c70ab5a5
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/.svn/text-base/pci-nommu.c.svn-base
@@ -0,0 +1,96 @@
+/* Fallback functions when the main IOMMU code is not compiled in. This
+   code is roughly equivalent to i386. */
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#include <asm/iommu.h>
+#include <asm/processor.h>
+#include <asm/dma.h>
+
+static int
+check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
+{
+	if (hwdev && !is_buffer_dma_capable(*hwdev->dma_mask, bus, size)) {
+		if (*hwdev->dma_mask >= DMA_32BIT_MASK)
+			printk(KERN_ERR
+			    "nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
+				name, (long long)bus, size,
+				(long long)*hwdev->dma_mask);
+		return 0;
+	}
+	return 1;
+}
+
+static dma_addr_t
+nommu_map_single(struct device *hwdev, phys_addr_t paddr, size_t size,
+	       int direction)
+{
+	dma_addr_t bus = paddr;
+	WARN_ON(size == 0);
+	if (!check_addr("map_single", hwdev, bus, size))
+				return bad_dma_address;
+	flush_write_buffers();
+	return bus;
+}
+
+
+/* Map a set of buffers described by scatterlist in streaming
+ * mode for DMA.  This is the scatter-gather version of the
+ * above pci_map_single interface.  Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
+	       int nents, int direction)
+{
+	struct scatterlist *s;
+	int i;
+
+	WARN_ON(nents == 0 || sg[0].length == 0);
+
+	for_each_sg(sg, s, nents, i) {
+		BUG_ON(!sg_page(s));
+		s->dma_address = sg_phys(s);
+		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
+			return 0;
+		s->dma_length = s->length;
+	}
+	flush_write_buffers();
+	return nents;
+}
+
+static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
+				dma_addr_t dma_addr)
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+
+struct dma_mapping_ops nommu_dma_ops = {
+	.alloc_coherent = dma_generic_alloc_coherent,
+	.free_coherent = nommu_free_coherent,
+	.map_single = nommu_map_single,
+	.map_sg = nommu_map_sg,
+	.is_phys = 1,
+};
+
+void __init no_iommu_init(void)
+{
+	if (dma_ops)
+		return;
+
+	force_iommu = 0; /* no HW IOMMU */
+	dma_ops = &nommu_dma_ops;
+}
diff --git a/libdde_linux26/contrib/arch/x86/kernel/pci-dma.c b/libdde_linux26/contrib/arch/x86/kernel/pci-dma.c
new file mode 100644
index 00000000..b2542853
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/pci-dma.c
@@ -0,0 +1,299 @@
+#include <linux/dma-mapping.h>
+#include <linux/dmar.h>
+#include <linux/bootmem.h>
+#include <linux/pci.h>
+
+#include <asm/proto.h>
+#include <asm/dma.h>
+#include <asm/iommu.h>
+#include <asm/gart.h>
+#include <asm/calgary.h>
+#include <asm/amd_iommu.h>
+
+static int forbid_dac __read_mostly;
+
+struct dma_mapping_ops *dma_ops;
+EXPORT_SYMBOL(dma_ops);
+
+static int iommu_sac_force __read_mostly;
+
+#ifdef CONFIG_IOMMU_DEBUG
+int panic_on_overflow __read_mostly = 1;
+int force_iommu __read_mostly = 1;
+#else
+int panic_on_overflow __read_mostly = 0;
+int force_iommu __read_mostly = 0;
+#endif
+
+int iommu_merge __read_mostly = 0;
+
+int no_iommu __read_mostly;
+/* Set this to 1 if there is a HW IOMMU in the system */
+int iommu_detected __read_mostly = 0;
+
+dma_addr_t bad_dma_address __read_mostly = 0;
+EXPORT_SYMBOL(bad_dma_address);
+
+/* Dummy device used for NULL arguments (normally ISA). Better would
+   be probably a smaller DMA mask, but this is bug-to-bug compatible
+   to older i386. */
+struct device x86_dma_fallback_dev = {
+	.init_name = "fallback device",
+	.coherent_dma_mask = DMA_32BIT_MASK,
+	.dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
+};
+EXPORT_SYMBOL(x86_dma_fallback_dev);
+
+int dma_set_mask(struct device *dev, u64 mask)
+{
+	if (!dev->dma_mask || !dma_supported(dev, mask))
+		return -EIO;
+
+	*dev->dma_mask = mask;
+
+	return 0;
+}
+EXPORT_SYMBOL(dma_set_mask);
+
+#ifdef CONFIG_X86_64
+static __initdata void *dma32_bootmem_ptr;
+static unsigned long dma32_bootmem_size __initdata = (128ULL<<20);
+
+static int __init parse_dma32_size_opt(char *p)
+{
+	if (!p)
+		return -EINVAL;
+	dma32_bootmem_size = memparse(p, &p);
+	return 0;
+}
+early_param("dma32_size", parse_dma32_size_opt);
+
+void __init dma32_reserve_bootmem(void)
+{
+	unsigned long size, align;
+	if (max_pfn <= MAX_DMA32_PFN)
+		return;
+
+	/*
+	 * check aperture_64.c allocate_aperture() for reason about
+	 * using 512M as goal
+	 */
+	align = 64ULL<<20;
+	size = roundup(dma32_bootmem_size, align);
+	dma32_bootmem_ptr = __alloc_bootmem_nopanic(size, align,
+				 512ULL<<20);
+	if (dma32_bootmem_ptr)
+		dma32_bootmem_size = size;
+	else
+		dma32_bootmem_size = 0;
+}
+static void __init dma32_free_bootmem(void)
+{
+
+	if (max_pfn <= MAX_DMA32_PFN)
+		return;
+
+	if (!dma32_bootmem_ptr)
+		return;
+
+	free_bootmem(__pa(dma32_bootmem_ptr), dma32_bootmem_size);
+
+	dma32_bootmem_ptr = NULL;
+	dma32_bootmem_size = 0;
+}
+#endif
+
+void __init pci_iommu_alloc(void)
+{
+#ifdef CONFIG_X86_64
+	/* free the range so iommu could get some range less than 4G */
+	dma32_free_bootmem();
+#endif
+
+	/*
+	 * The order of these functions is important for
+	 * fall-back/fail-over reasons
+	 */
+	gart_iommu_hole_init();
+
+	detect_calgary();
+
+	detect_intel_iommu();
+
+	amd_iommu_detect();
+
+	pci_swiotlb_init();
+}
+
+void *dma_generic_alloc_coherent(struct device *dev, size_t size,
+				 dma_addr_t *dma_addr, gfp_t flag)
+{
+	unsigned long dma_mask;
+	struct page *page;
+	dma_addr_t addr;
+
+	dma_mask = dma_alloc_coherent_mask(dev, flag);
+
+	flag |= __GFP_ZERO;
+again:
+	page = alloc_pages_node(dev_to_node(dev), flag, get_order(size));
+	if (!page)
+		return NULL;
+
+	addr = page_to_phys(page);
+	if (!is_buffer_dma_capable(dma_mask, addr, size)) {
+		__free_pages(page, get_order(size));
+
+		if (dma_mask < DMA_32BIT_MASK && !(flag & GFP_DMA)) {
+			flag = (flag & ~GFP_DMA32) | GFP_DMA;
+			goto again;
+		}
+
+		return NULL;
+	}
+
+	*dma_addr = addr;
+	return page_address(page);
+}
+
+/*
+ * See <Documentation/x86_64/boot-options.txt> for the iommu kernel parameter
+ * documentation.
+ */
+static __init int iommu_setup(char *p)
+{
+	iommu_merge = 1;
+
+	if (!p)
+		return -EINVAL;
+
+	while (*p) {
+		if (!strncmp(p, "off", 3))
+			no_iommu = 1;
+		/* gart_parse_options has more force support */
+		if (!strncmp(p, "force", 5))
+			force_iommu = 1;
+		if (!strncmp(p, "noforce", 7)) {
+			iommu_merge = 0;
+			force_iommu = 0;
+		}
+
+		if (!strncmp(p, "biomerge", 8)) {
+			iommu_merge = 1;
+			force_iommu = 1;
+		}
+		if (!strncmp(p, "panic", 5))
+			panic_on_overflow = 1;
+		if (!strncmp(p, "nopanic", 7))
+			panic_on_overflow = 0;
+		if (!strncmp(p, "merge", 5)) {
+			iommu_merge = 1;
+			force_iommu = 1;
+		}
+		if (!strncmp(p, "nomerge", 7))
+			iommu_merge = 0;
+		if (!strncmp(p, "forcesac", 8))
+			iommu_sac_force = 1;
+		if (!strncmp(p, "allowdac", 8))
+			forbid_dac = 0;
+		if (!strncmp(p, "nodac", 5))
+			forbid_dac = -1;
+		if (!strncmp(p, "usedac", 6)) {
+			forbid_dac = -1;
+			return 1;
+		}
+#ifdef CONFIG_SWIOTLB
+		if (!strncmp(p, "soft", 4))
+			swiotlb = 1;
+#endif
+
+		gart_parse_options(p);
+
+#ifdef CONFIG_CALGARY_IOMMU
+		if (!strncmp(p, "calgary", 7))
+			use_calgary = 1;
+#endif /* CONFIG_CALGARY_IOMMU */
+
+		p += strcspn(p, ",");
+		if (*p == ',')
+			++p;
+	}
+	return 0;
+}
+early_param("iommu", iommu_setup);
+
+int dma_supported(struct device *dev, u64 mask)
+{
+	struct dma_mapping_ops *ops = get_dma_ops(dev);
+
+#ifdef CONFIG_PCI
+	if (mask > 0xffffffff && forbid_dac > 0) {
+		dev_info(dev, "PCI: Disallowing DAC for device\n");
+		return 0;
+	}
+#endif
+
+	if (ops->dma_supported)
+		return ops->dma_supported(dev, mask);
+
+	/* Copied from i386. Doesn't make much sense, because it will
+	   only work for pci_alloc_coherent.
+	   The caller just has to use GFP_DMA in this case. */
+	if (mask < DMA_24BIT_MASK)
+		return 0;
+
+	/* Tell the device to use SAC when IOMMU force is on.  This
+	   allows the driver to use cheaper accesses in some cases.
+
+	   Problem with this is that if we overflow the IOMMU area and
+	   return DAC as fallback address the device may not handle it
+	   correctly.
+
+	   As a special case some controllers have a 39bit address
+	   mode that is as efficient as 32bit (aic79xx). Don't force
+	   SAC for these.  Assume all masks <= 40 bits are of this
+	   type. Normally this doesn't make any difference, but gives
+	   more gentle handling of IOMMU overflow. */
+	if (iommu_sac_force && (mask >= DMA_40BIT_MASK)) {
+		dev_info(dev, "Force SAC with mask %Lx\n", mask);
+		return 0;
+	}
+
+	return 1;
+}
+EXPORT_SYMBOL(dma_supported);
+
+static int __init pci_iommu_init(void)
+{
+	calgary_iommu_init();
+
+	intel_iommu_init();
+
+	amd_iommu_init();
+
+	gart_iommu_init();
+
+	no_iommu_init();
+	return 0;
+}
+
+void pci_iommu_shutdown(void)
+{
+	gart_iommu_shutdown();
+}
+/* Must execute after PCI subsystem */
+fs_initcall(pci_iommu_init);
+
+#ifdef CONFIG_PCI
+/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
+
+static __devinit void via_no_dac(struct pci_dev *dev)
+{
+	if ((dev->class >> 8) == PCI_CLASS_BRIDGE_PCI && forbid_dac == 0) {
+		printk(KERN_INFO
+			"PCI: VIA PCI bridge detected. Disabling DAC.\n");
+		forbid_dac = 1;
+	}
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_ANY_ID, via_no_dac);
+#endif
diff --git a/libdde_linux26/contrib/arch/x86/kernel/pci-nommu.c b/libdde_linux26/contrib/arch/x86/kernel/pci-nommu.c
new file mode 100644
index 00000000..c70ab5a5
--- /dev/null
+++ b/libdde_linux26/contrib/arch/x86/kernel/pci-nommu.c
@@ -0,0 +1,96 @@
+/* Fallback functions when the main IOMMU code is not compiled in. This
+   code is roughly equivalent to i386. */
+#include <linux/mm.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/string.h>
+#include <linux/dma-mapping.h>
+#include <linux/scatterlist.h>
+
+#include <asm/iommu.h>
+#include <asm/processor.h>
+#include <asm/dma.h>
+
+static int
+check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
+{
+	if (hwdev && !is_buffer_dma_capable(*hwdev->dma_mask, bus, size)) {
+		if (*hwdev->dma_mask >= DMA_32BIT_MASK)
+			printk(KERN_ERR
+			    "nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
+				name, (long long)bus, size,
+				(long long)*hwdev->dma_mask);
+		return 0;
+	}
+	return 1;
+}
+
+static dma_addr_t
+nommu_map_single(struct device *hwdev, phys_addr_t paddr, size_t size,
+	       int direction)
+{
+	dma_addr_t bus = paddr;
+	WARN_ON(size == 0);
+	if (!check_addr("map_single", hwdev, bus, size))
+				return bad_dma_address;
+	flush_write_buffers();
+	return bus;
+}
+
+
+/* Map a set of buffers described by scatterlist in streaming
+ * mode for DMA.  This is the scatter-gather version of the
+ * above pci_map_single interface.  Here the scatter gather list
+ * elements are each tagged with the appropriate dma address
+ * and length.  They are obtained via sg_dma_{address,length}(SG).
+ *
+ * NOTE: An implementation may be able to use a smaller number of
+ *       DMA address/length pairs than there are SG table elements.
+ *       (for example via virtual mapping capabilities)
+ *       The routine returns the number of addr/length pairs actually
+ *       used, at most nents.
+ *
+ * Device ownership issues as mentioned above for pci_map_single are
+ * the same here.
+ */
+static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
+	       int nents, int direction)
+{
+	struct scatterlist *s;
+	int i;
+
+	WARN_ON(nents == 0 || sg[0].length == 0);
+
+	for_each_sg(sg, s, nents, i) {
+		BUG_ON(!sg_page(s));
+		s->dma_address = sg_phys(s);
+		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
+			return 0;
+		s->dma_length = s->length;
+	}
+	flush_write_buffers();
+	return nents;
+}
+
+static void nommu_free_coherent(struct device *dev, size_t size, void *vaddr,
+				dma_addr_t dma_addr)
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+
+struct dma_mapping_ops nommu_dma_ops = {
+	.alloc_coherent = dma_generic_alloc_coherent,
+	.free_coherent = nommu_free_coherent,
+	.map_single = nommu_map_single,
+	.map_sg = nommu_map_sg,
+	.is_phys = 1,
+};
+
+void __init no_iommu_init(void)
+{
+	if (dma_ops)
+		return;
+
+	force_iommu = 0; /* no HW IOMMU */
+	dma_ops = &nommu_dma_ops;
+}