ia64/linux-2.6.18-xen.hg

view include/asm-i386/dma-mapping.h @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 #ifndef _ASM_I386_DMA_MAPPING_H
2 #define _ASM_I386_DMA_MAPPING_H
4 #include <linux/mm.h>
6 #include <asm/cache.h>
7 #include <asm/io.h>
8 #include <asm/scatterlist.h>
9 #include <asm/bug.h>
11 #define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
12 #define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
14 void *dma_alloc_coherent(struct device *dev, size_t size,
15 dma_addr_t *dma_handle, gfp_t flag);
17 void dma_free_coherent(struct device *dev, size_t size,
18 void *vaddr, dma_addr_t dma_handle);
20 static inline dma_addr_t
21 dma_map_single(struct device *dev, void *ptr, size_t size,
22 enum dma_data_direction direction)
23 {
24 if (direction == DMA_NONE)
25 BUG();
26 WARN_ON(size == 0);
27 flush_write_buffers();
28 return virt_to_phys(ptr);
29 }
31 static inline void
32 dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
33 enum dma_data_direction direction)
34 {
35 if (direction == DMA_NONE)
36 BUG();
37 }
39 static inline int
40 dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
41 enum dma_data_direction direction)
42 {
43 int i;
45 if (direction == DMA_NONE)
46 BUG();
47 WARN_ON(nents == 0 || sg[0].length == 0);
49 for (i = 0; i < nents; i++ ) {
50 BUG_ON(!sg[i].page);
52 sg[i].dma_address = page_to_phys(sg[i].page) + sg[i].offset;
53 }
55 flush_write_buffers();
56 return nents;
57 }
59 static inline dma_addr_t
60 dma_map_page(struct device *dev, struct page *page, unsigned long offset,
61 size_t size, enum dma_data_direction direction)
62 {
63 BUG_ON(direction == DMA_NONE);
64 return page_to_phys(page) + offset;
65 }
67 static inline void
68 dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
69 enum dma_data_direction direction)
70 {
71 BUG_ON(direction == DMA_NONE);
72 }
75 static inline void
76 dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
77 enum dma_data_direction direction)
78 {
79 BUG_ON(direction == DMA_NONE);
80 }
82 static inline void
83 dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
84 enum dma_data_direction direction)
85 {
86 }
88 static inline void
89 dma_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size,
90 enum dma_data_direction direction)
91 {
92 flush_write_buffers();
93 }
95 static inline void
96 dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
97 unsigned long offset, size_t size,
98 enum dma_data_direction direction)
99 {
100 }
102 static inline void
103 dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
104 unsigned long offset, size_t size,
105 enum dma_data_direction direction)
106 {
107 flush_write_buffers();
108 }
110 static inline void
111 dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
112 enum dma_data_direction direction)
113 {
114 }
116 static inline void
117 dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, int nelems,
118 enum dma_data_direction direction)
119 {
120 flush_write_buffers();
121 }
123 static inline int
124 dma_mapping_error(dma_addr_t dma_addr)
125 {
126 return 0;
127 }
129 static inline int
130 dma_supported(struct device *dev, u64 mask)
131 {
132 /*
133 * we fall back to GFP_DMA when the mask isn't all 1s,
134 * so we can't guarantee allocations that must be
135 * within a tighter range than GFP_DMA..
136 */
137 if(mask < 0x00ffffff)
138 return 0;
140 return 1;
141 }
143 static inline int
144 dma_set_mask(struct device *dev, u64 mask)
145 {
146 if(!dev->dma_mask || !dma_supported(dev, mask))
147 return -EIO;
149 *dev->dma_mask = mask;
151 return 0;
152 }
154 static inline int
155 dma_get_cache_alignment(void)
156 {
157 /* no easy way to get cache size on all x86, so return the
158 * maximum possible, to be safe */
159 return (1 << INTERNODE_CACHE_SHIFT);
160 }
162 #define dma_is_consistent(d) (1)
164 static inline void
165 dma_cache_sync(void *vaddr, size_t size,
166 enum dma_data_direction direction)
167 {
168 flush_write_buffers();
169 }
171 #define ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY
172 extern int
173 dma_declare_coherent_memory(struct device *dev, dma_addr_t bus_addr,
174 dma_addr_t device_addr, size_t size, int flags);
176 extern void
177 dma_release_declared_memory(struct device *dev);
179 extern void *
180 dma_mark_declared_memory_occupied(struct device *dev,
181 dma_addr_t device_addr, size_t size);
183 #endif