block: add some comments around the bio read-write flags
[linux-2.6] / include / asm-x86 / device.h
1 #ifndef _ASM_X86_DEVICE_H
2 #define _ASM_X86_DEVICE_H
3
4 struct dev_archdata {
5 #ifdef CONFIG_ACPI
6         void    *acpi_handle;
7 #endif
8 #ifdef CONFIG_X86_64
9 struct dma_mapping_ops *dma_ops;
10 #endif
11 #ifdef CONFIG_DMAR
12         void *iommu; /* hook for IOMMU specific extension */
13 #endif
14 };
15
16 #endif /* _ASM_X86_DEVICE_H */