diff options
Diffstat (limited to 'xenolinux-2.4.26-sparse/arch/xen/kernel/pci-dma.c')
-rw-r--r-- | xenolinux-2.4.26-sparse/arch/xen/kernel/pci-dma.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/xenolinux-2.4.26-sparse/arch/xen/kernel/pci-dma.c b/xenolinux-2.4.26-sparse/arch/xen/kernel/pci-dma.c new file mode 100644 index 0000000000..dd8842719e --- /dev/null +++ b/xenolinux-2.4.26-sparse/arch/xen/kernel/pci-dma.c @@ -0,0 +1,37 @@ +/* + * 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_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)); +} |