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