1/*
2 * Dynamic DMA mapping support.
3 *
4 * On i386 there is no hardware dynamic DMA address translation,
5 * so consistent alloc/free are merely page allocation/freeing.
6 * The rest of the dynamic DMA mapping interface is implemented
7 * in asm/pci.h.
8 */
9
10#include <linux/types.h>
11#include <linux/mm.h>
12#include <linux/string.h>
13#include <linux/pci.h>
14#include <asm/io.h>
15
16void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size,
17			   dma_addr_t *dma_handle)
18{
19	void *ret;
20	int gfp = GFP_ATOMIC;
21
22	if (hwdev == NULL || ((u32)hwdev->dma_mask < 0xffffffff))
23		gfp |= GFP_DMA;
24	ret = (void *)__get_free_pages(gfp, get_order(size));
25
26	if (ret != NULL) {
27		memset(ret, 0, size);
28		*dma_handle = virt_to_bus(ret);
29	}
30	return ret;
31}
32
33void pci_free_consistent(struct pci_dev *hwdev, size_t size,
34			 void *vaddr, dma_addr_t dma_handle)
35{
36	free_pages((unsigned long)vaddr, get_order(size));
37}
38