ia64/linux-2.6.18-xen.hg

view arch/m68knommu/kernel/dma.c @ 0:831230e53067

Import 2.6.18 from kernel.org tarball.
author Ian Campbell <ian.campbell@xensource.com>
date Wed Apr 11 14:15:44 2007 +0100 (2007-04-11)
parents
children
line source
1 /*
2 * Dynamic DMA mapping support.
3 *
4 * We never have any address translations to worry about, so this
5 * is just alloc/free.
6 */
8 #include <linux/types.h>
9 #include <linux/mm.h>
10 #include <linux/string.h>
11 #include <linux/pci.h>
12 #include <asm/io.h>
14 void *dma_alloc_coherent(struct device *dev, size_t size,
15 dma_addr_t *dma_handle, int gfp)
16 {
17 void *ret;
18 /* ignore region specifiers */
19 gfp &= ~(__GFP_DMA | __GFP_HIGHMEM);
21 if (dev == NULL || (*dev->dma_mask < 0xffffffff))
22 gfp |= GFP_DMA;
23 ret = (void *)__get_free_pages(gfp, get_order(size));
25 if (ret != NULL) {
26 memset(ret, 0, size);
27 *dma_handle = virt_to_phys(ret);
28 }
29 return ret;
30 }
32 void dma_free_coherent(struct device *dev, size_t size,
33 void *vaddr, dma_addr_t dma_handle)
34 {
35 free_pages((unsigned long)vaddr, get_order(size));
36 }