diff options
Diffstat (limited to 'tools/virtio/linux/virtio.h')
-rw-r--r-- | tools/virtio/linux/virtio.h | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h new file mode 100644 index 000000000000..669bcdd45805 --- /dev/null +++ b/tools/virtio/linux/virtio.h | |||
@@ -0,0 +1,223 @@ | |||
1 | #ifndef LINUX_VIRTIO_H | ||
2 | #define LINUX_VIRTIO_H | ||
3 | |||
4 | #include <stdbool.h> | ||
5 | #include <stdlib.h> | ||
6 | #include <stddef.h> | ||
7 | #include <stdio.h> | ||
8 | #include <string.h> | ||
9 | #include <assert.h> | ||
10 | |||
11 | #include <linux/types.h> | ||
12 | #include <errno.h> | ||
13 | |||
14 | typedef unsigned long long dma_addr_t; | ||
15 | |||
16 | struct scatterlist { | ||
17 | unsigned long page_link; | ||
18 | unsigned int offset; | ||
19 | unsigned int length; | ||
20 | dma_addr_t dma_address; | ||
21 | }; | ||
22 | |||
23 | struct page { | ||
24 | unsigned long long dummy; | ||
25 | }; | ||
26 | |||
27 | #define BUG_ON(__BUG_ON_cond) assert(!(__BUG_ON_cond)) | ||
28 | |||
29 | /* Physical == Virtual */ | ||
30 | #define virt_to_phys(p) ((unsigned long)p) | ||
31 | #define phys_to_virt(a) ((void *)(unsigned long)(a)) | ||
32 | /* Page address: Virtual / 4K */ | ||
33 | #define virt_to_page(p) ((struct page*)((virt_to_phys(p) / 4096) * \ | ||
34 | sizeof(struct page))) | ||
35 | #define offset_in_page(p) (((unsigned long)p) % 4096) | ||
36 | #define sg_phys(sg) ((sg->page_link & ~0x3) / sizeof(struct page) * 4096 + \ | ||
37 | sg->offset) | ||
38 | static inline void sg_mark_end(struct scatterlist *sg) | ||
39 | { | ||
40 | /* | ||
41 | * Set termination bit, clear potential chain bit | ||
42 | */ | ||
43 | sg->page_link |= 0x02; | ||
44 | sg->page_link &= ~0x01; | ||
45 | } | ||
46 | static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents) | ||
47 | { | ||
48 | memset(sgl, 0, sizeof(*sgl) * nents); | ||
49 | sg_mark_end(&sgl[nents - 1]); | ||
50 | } | ||
51 | static inline void sg_assign_page(struct scatterlist *sg, struct page *page) | ||
52 | { | ||
53 | unsigned long page_link = sg->page_link & 0x3; | ||
54 | |||
55 | /* | ||
56 | * In order for the low bit stealing approach to work, pages | ||
57 | * must be aligned at a 32-bit boundary as a minimum. | ||
58 | */ | ||
59 | BUG_ON((unsigned long) page & 0x03); | ||
60 | sg->page_link = page_link | (unsigned long) page; | ||
61 | } | ||
62 | |||
63 | static inline void sg_set_page(struct scatterlist *sg, struct page *page, | ||
64 | unsigned int len, unsigned int offset) | ||
65 | { | ||
66 | sg_assign_page(sg, page); | ||
67 | sg->offset = offset; | ||
68 | sg->length = len; | ||
69 | } | ||
70 | |||
71 | static inline void sg_set_buf(struct scatterlist *sg, const void *buf, | ||
72 | unsigned int buflen) | ||
73 | { | ||
74 | sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf)); | ||
75 | } | ||
76 | |||
77 | static inline void sg_init_one(struct scatterlist *sg, const void *buf, unsigned int buflen) | ||
78 | { | ||
79 | sg_init_table(sg, 1); | ||
80 | sg_set_buf(sg, buf, buflen); | ||
81 | } | ||
82 | |||
83 | typedef __u16 u16; | ||
84 | |||
85 | typedef enum { | ||
86 | GFP_KERNEL, | ||
87 | GFP_ATOMIC, | ||
88 | } gfp_t; | ||
89 | typedef enum { | ||
90 | IRQ_NONE, | ||
91 | IRQ_HANDLED | ||
92 | } irqreturn_t; | ||
93 | |||
94 | static inline void *kmalloc(size_t s, gfp_t gfp) | ||
95 | { | ||
96 | return malloc(s); | ||
97 | } | ||
98 | |||
99 | static inline void kfree(void *p) | ||
100 | { | ||
101 | free(p); | ||
102 | } | ||
103 | |||
104 | #define container_of(ptr, type, member) ({ \ | ||
105 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | ||
106 | (type *)( (char *)__mptr - offsetof(type,member) );}) | ||
107 | |||
108 | #define uninitialized_var(x) x = x | ||
109 | |||
110 | # ifndef likely | ||
111 | # define likely(x) (__builtin_expect(!!(x), 1)) | ||
112 | # endif | ||
113 | # ifndef unlikely | ||
114 | # define unlikely(x) (__builtin_expect(!!(x), 0)) | ||
115 | # endif | ||
116 | |||
117 | #define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__) | ||
118 | #ifdef DEBUG | ||
119 | #define pr_debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__) | ||
120 | #else | ||
121 | #define pr_debug(format, ...) do {} while (0) | ||
122 | #endif | ||
123 | #define dev_err(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__) | ||
124 | #define dev_warn(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__) | ||
125 | |||
126 | /* TODO: empty stubs for now. Broken but enough for virtio_ring.c */ | ||
127 | #define list_add_tail(a, b) do {} while (0) | ||
128 | #define list_del(a) do {} while (0) | ||
129 | |||
130 | #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) | ||
131 | #define BITS_PER_BYTE 8 | ||
132 | #define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE) | ||
133 | #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) | ||
134 | /* TODO: Not atomic as it should be: | ||
135 | * we don't use this for anything important. */ | ||
136 | static inline void clear_bit(int nr, volatile unsigned long *addr) | ||
137 | { | ||
138 | unsigned long mask = BIT_MASK(nr); | ||
139 | unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); | ||
140 | |||
141 | *p &= ~mask; | ||
142 | } | ||
143 | |||
144 | static inline int test_bit(int nr, const volatile unsigned long *addr) | ||
145 | { | ||
146 | return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1))); | ||
147 | } | ||
148 | |||
149 | /* The only feature we care to support */ | ||
150 | #define virtio_has_feature(dev, feature) \ | ||
151 | test_bit((feature), (dev)->features) | ||
152 | /* end of stubs */ | ||
153 | |||
154 | struct virtio_device { | ||
155 | void *dev; | ||
156 | unsigned long features[1]; | ||
157 | }; | ||
158 | |||
159 | struct virtqueue { | ||
160 | /* TODO: commented as list macros are empty stubs for now. | ||
161 | * Broken but enough for virtio_ring.c | ||
162 | * struct list_head list; */ | ||
163 | void (*callback)(struct virtqueue *vq); | ||
164 | const char *name; | ||
165 | struct virtio_device *vdev; | ||
166 | void *priv; | ||
167 | }; | ||
168 | |||
169 | #define EXPORT_SYMBOL_GPL(__EXPORT_SYMBOL_GPL_name) \ | ||
170 | void __EXPORT_SYMBOL_GPL##__EXPORT_SYMBOL_GPL_name() { \ | ||
171 | } | ||
172 | #define MODULE_LICENSE(__MODULE_LICENSE_value) \ | ||
173 | const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value | ||
174 | |||
175 | #define CONFIG_SMP | ||
176 | |||
177 | #if defined(__i386__) || defined(__x86_64__) | ||
178 | #define barrier() asm volatile("" ::: "memory") | ||
179 | #define mb() __sync_synchronize() | ||
180 | |||
181 | #define smp_mb() mb() | ||
182 | # define smp_rmb() barrier() | ||
183 | # define smp_wmb() barrier() | ||
184 | #else | ||
185 | #error Please fill in barrier macros | ||
186 | #endif | ||
187 | |||
188 | /* Interfaces exported by virtio_ring. */ | ||
189 | int virtqueue_add_buf_gfp(struct virtqueue *vq, | ||
190 | struct scatterlist sg[], | ||
191 | unsigned int out_num, | ||
192 | unsigned int in_num, | ||
193 | void *data, | ||
194 | gfp_t gfp); | ||
195 | |||
196 | static inline int virtqueue_add_buf(struct virtqueue *vq, | ||
197 | struct scatterlist sg[], | ||
198 | unsigned int out_num, | ||
199 | unsigned int in_num, | ||
200 | void *data) | ||
201 | { | ||
202 | return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC); | ||
203 | } | ||
204 | |||
205 | void virtqueue_kick(struct virtqueue *vq); | ||
206 | |||
207 | void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len); | ||
208 | |||
209 | void virtqueue_disable_cb(struct virtqueue *vq); | ||
210 | |||
211 | bool virtqueue_enable_cb(struct virtqueue *vq); | ||
212 | |||
213 | void *virtqueue_detach_unused_buf(struct virtqueue *vq); | ||
214 | struct virtqueue *vring_new_virtqueue(unsigned int num, | ||
215 | unsigned int vring_align, | ||
216 | struct virtio_device *vdev, | ||
217 | void *pages, | ||
218 | void (*notify)(struct virtqueue *vq), | ||
219 | void (*callback)(struct virtqueue *vq), | ||
220 | const char *name); | ||
221 | void vring_del_virtqueue(struct virtqueue *vq); | ||
222 | |||
223 | #endif | ||