diff options
Diffstat (limited to 'include/asm-sparc64/pbm.h')
| -rw-r--r-- | include/asm-sparc64/pbm.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/include/asm-sparc64/pbm.h b/include/asm-sparc64/pbm.h index 12f015edb..22281b176 100644 --- a/include/asm-sparc64/pbm.h +++ b/include/asm-sparc64/pbm.h @@ -1,4 +1,4 @@ -/* $Id: pbm.h,v 1.19 1999/12/17 12:32:13 jj Exp $ +/* $Id: pbm.h,v 1.20 2000/02/18 13:50:55 davem Exp $ * pbm.h: UltraSparc PCI controller software state. * * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@redhat.com) @@ -69,6 +69,18 @@ struct pci_iommu { * these counters. You have been duly warned. -DaveM */ u16 lowest_free[PBM_NCLUSTERS]; + + /* Here a PCI controller driver describes the areas of + * PCI memory space where DMA to/from physical memory + * are addressed. Drivers interrogate the PCI layer + * if their device has addressing limitations. They + * do so via pci_dma_supported, and pass in a mask of + * DMA address bits their device can actually drive. + * + * The test for being usable is: + * (device_mask & dma_addr_mask) == dma_addr_mask + */ + u32 dma_addr_mask; }; /* This describes a PCI bus module's streaming buffer. */ |