| /* |
| * Dynamic DMA mapping support. |
| * |
| * On i386 there is no hardware dynamic DMA address translation, |
| * so consistent alloc/free are merely page allocation/freeing. |
| * The rest of the dynamic DMA mapping interface is implemented |
| * in asm/pci.h. |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/pci.h> |
| #include <asm/io.h> |
| |
| void *pci_alloc_consistent(struct pci_dev *hwdev, size_t size, |
| dma_addr_t *dma_handle) |
| { |
| void *ret; |
| int gfp = GFP_ATOMIC; |
| |
| if (hwdev == NULL || ((u32)hwdev->dma_mask != 0xffffffff)) |
| gfp |= GFP_DMA; |
| ret = (void *)__get_free_pages(gfp, get_order(size)); |
| |
| if (ret != NULL) { |
| memset(ret, 0, size); |
| *dma_handle = virt_to_phys(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)); |
| } |