patch-2.3.43 linux/arch/ia64/kernel/pci-dma.c

• Lines: 57
• Date: Wed Feb 9 19:45:43 2000
• Orig file: v2.3.42/linux/arch/ia64/kernel/pci-dma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.42/linux/arch/ia64/kernel/pci-dma.c linux/arch/ia64/kernel/pci-dma.c
@@ -0,0 +1,56 @@
+/*
+ * Dynamic DMA mapping support.
+ *
+ * This implementation is for IA-64 platforms that do not support
+ * I/O TLBs (aka DMA address translation hardware).
+ *
+ * XXX This doesn't do the right thing yet.  It appears we would have
+ * to add additional zones so we can implement the various address
+ * mask constraints that we might encounter.  A zone for memory < 32
+ * bits is obviously necessary...
+ */
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+
+#include <asm/io.h>
+
+/* Pure 2^n version of get_order */
+extern __inline__ unsigned long
+get_order (unsigned long size)
+{
+	unsigned long order = ia64_fls(size);
+
+	printk ("get_order: size=%lu, order=%lu\n", size, order);
+
+	if (order > PAGE_SHIFT)
+		order -= PAGE_SHIFT;
+	else
+		order = 0;
+	return order;
+}
+
+void *
+pci_alloc_consistent (struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
+{
+	void *ret;
+	int gfp = GFP_ATOMIC;
+
+	if (!hwdev || hwdev->dma_mask != 0xffffffff)
+		gfp |= GFP_DMA;
+	ret = (void *)__get_free_pages(gfp, get_order(size));
+
+	if (ret) {
+		memset(ret, 0, size);
+		*dma_handle = virt_to_bus(ret);
+	}
+	return ret;
+}
+
+void
+pci_free_consistent (struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
+{
+	free_pages((unsigned long) vaddr, get_order(size));
+}