ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-ia64/agp.h @ 9762:a3cc276f2e87

[IA64] dma paravirtualization

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@localhost
date Tue Apr 25 16:53:27 2006 -0600 (2006-04-25)
parents bfc00c83f083
children c3e20511c745
line source
1 #ifndef _ASM_IA64_AGP_H
2 #define _ASM_IA64_AGP_H
4 /*
5 * IA-64 specific AGP definitions.
6 *
7 * Copyright (C) 2002-2003 Hewlett-Packard Co
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 */
11 /*
12 * To avoid memory-attribute aliasing issues, we require that the AGPGART engine operate
13 * in coherent mode, which lets us map the AGP memory as normal (write-back) memory
14 * (unlike x86, where it gets mapped "write-coalescing").
15 */
16 #define map_page_into_agp(page) /* nothing */
17 #define unmap_page_from_agp(page) /* nothing */
18 #define flush_agp_mappings() /* nothing */
19 #define flush_agp_cache() mb()
21 /* Convert a physical address to an address suitable for the GART. */
22 #ifndef CONFIG_XEN_IA64_DOM0_VP
23 #define phys_to_gart(x) (x)
24 #define gart_to_phys(x) (x)
25 #else
26 #define phys_to_gart(x) phys_to_machine_for_dma(x)
27 #define gart_to_phys(x) machine_to_phys_for_dma(x)
28 #endif
30 /* GATT allocation. Returns/accepts GATT kernel virtual address. */
31 #ifndef CONFIG_XEN_IA64_DOM0_VP
32 #define alloc_gatt_pages(order) \
33 ((char *)__get_free_pages(GFP_KERNEL, (order)))
34 #define free_gatt_pages(table, order) \
35 free_pages((unsigned long)(table), (order))
36 #else
37 #include <asm/hypervisor.h>
38 static inline char*
39 alloc_gatt_pages(unsigned int order)
40 {
41 unsigned long error;
42 unsigned long ret = __get_free_pages(GFP_KERNEL, (order));
43 if (ret == 0) {
44 goto out;
45 }
46 error = xen_create_contiguous_region(ret, order, 0);
47 if (error) {
48 free_pages(ret, order);
49 ret = 0;
50 }
51 out:
52 return (char*)ret;
53 }
54 static inline void
55 free_gatt_pages(void* table, unsigned int order)
56 {
57 xen_destroy_contiguous_region((unsigned long)table, order);
58 free_pages((unsigned long)table, order);
59 }
60 #endif /* CONFIG_XEN_IA64_DOM0_VP */
62 #endif /* _ASM_IA64_AGP_H */