1 files changed, 94 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
new file mode 100644
index 000000000000..67d90b89af0b
--- /dev/null
+++ b/arch/x86_64/kernel/pci-nommu.c
@@ -0,0 +1,94 @@
+/* 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 <asm/proto.h>
+#include <asm/processor.h>
+
+int iommu_merge = 0;
+EXPORT_SYMBOL(iommu_merge);
+
+dma_addr_t bad_dma_address;
+EXPORT_SYMBOL(bad_dma_address);
+
+int iommu_bio_merge = 0;
+EXPORT_SYMBOL(iommu_bio_merge);
+
+int iommu_sac_force = 0;
+EXPORT_SYMBOL(iommu_sac_force);
+
+/* 
+ * Dummy IO MMU functions
+ */
+
+void *dma_alloc_coherent(struct device *hwdev, size_t size,
+			 dma_addr_t *dma_handle, unsigned gfp)
+{
+	void *ret;
+	u64 mask;
+	int order = get_order(size);
+
+	if (hwdev)
+		mask = hwdev->coherent_dma_mask & *hwdev->dma_mask;
+	else
+		mask = 0xffffffff;
+	for (;;) {
+		ret = (void *)__get_free_pages(gfp, order);
+		if (ret == NULL)
+			return NULL;
+		*dma_handle = virt_to_bus(ret);
+		if ((*dma_handle & ~mask) == 0)
+			break;
+		free_pages((unsigned long)ret, order);
+		if (gfp & GFP_DMA)
+			return NULL;
+		gfp |= GFP_DMA;
+	}
+
+	memset(ret, 0, size);
+	return ret;
+}
+EXPORT_SYMBOL(dma_alloc_coherent);
+
+void dma_free_coherent(struct device *hwdev, size_t size,
+			 void *vaddr, dma_addr_t dma_handle)
+{
+	free_pages((unsigned long)vaddr, get_order(size));
+}
+EXPORT_SYMBOL(dma_free_coherent);
+
+int dma_supported(struct device *hwdev, u64 mask)
+{
+        /*
+         * we fall back to GFP_DMA when the mask isn't all 1s,
+         * so we can't guarantee allocations that must be
+         * within a tighter range than GFP_DMA..
+	 * RED-PEN this won't work for pci_map_single. Caller has to
+	 * use GFP_DMA in the first place.
+         */
+        if (mask < 0x00ffffff)
+                return 0;
+
+	return 1;
+} 
+EXPORT_SYMBOL(dma_supported);
+
+int dma_get_cache_alignment(void)
+{
+	return boot_cpu_data.x86_clflush_size;
+}
+EXPORT_SYMBOL(dma_get_cache_alignment);
+
+static int __init check_ram(void) 
+{ 
+	if (end_pfn >= 0xffffffff>>PAGE_SHIFT) { 
+		printk(
+		KERN_ERR "WARNING more than 4GB of memory but IOMMU not compiled in.\n"
+		KERN_ERR "WARNING 32bit PCI may malfunction.\n");
+	} 
+	return 0;
+} 
+__initcall(check_ram);
+