forked from luck/tmp_suning_uos_patched
4e53f78e5b
This is the userspace part of the tool: it includes a bunch of stubs for linux APIs, somewhat simular to linuxsched. This makes it possible to recompile the ring code in userspace. A small test example is implemented combining this with vhost_test module. Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
224 lines
5.7 KiB
C
224 lines
5.7 KiB
C
#ifndef LINUX_VIRTIO_H
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#define LINUX_VIRTIO_H
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#include <stdbool.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <linux/types.h>
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#include <errno.h>
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typedef unsigned long long dma_addr_t;
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struct scatterlist {
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unsigned long page_link;
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unsigned int offset;
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unsigned int length;
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dma_addr_t dma_address;
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};
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struct page {
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unsigned long long dummy;
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};
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#define BUG_ON(__BUG_ON_cond) assert(!(__BUG_ON_cond))
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/* Physical == Virtual */
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#define virt_to_phys(p) ((unsigned long)p)
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#define phys_to_virt(a) ((void *)(unsigned long)(a))
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/* Page address: Virtual / 4K */
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#define virt_to_page(p) ((struct page*)((virt_to_phys(p) / 4096) * \
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sizeof(struct page)))
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#define offset_in_page(p) (((unsigned long)p) % 4096)
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#define sg_phys(sg) ((sg->page_link & ~0x3) / sizeof(struct page) * 4096 + \
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sg->offset)
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static inline void sg_mark_end(struct scatterlist *sg)
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{
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/*
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* Set termination bit, clear potential chain bit
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*/
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sg->page_link |= 0x02;
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sg->page_link &= ~0x01;
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}
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static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
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{
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memset(sgl, 0, sizeof(*sgl) * nents);
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sg_mark_end(&sgl[nents - 1]);
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}
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static inline void sg_assign_page(struct scatterlist *sg, struct page *page)
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{
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unsigned long page_link = sg->page_link & 0x3;
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/*
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* In order for the low bit stealing approach to work, pages
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* must be aligned at a 32-bit boundary as a minimum.
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*/
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BUG_ON((unsigned long) page & 0x03);
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sg->page_link = page_link | (unsigned long) page;
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}
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static inline void sg_set_page(struct scatterlist *sg, struct page *page,
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unsigned int len, unsigned int offset)
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{
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sg_assign_page(sg, page);
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sg->offset = offset;
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sg->length = len;
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}
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static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
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unsigned int buflen)
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{
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sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
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}
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static inline void sg_init_one(struct scatterlist *sg, const void *buf, unsigned int buflen)
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{
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sg_init_table(sg, 1);
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sg_set_buf(sg, buf, buflen);
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}
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typedef __u16 u16;
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typedef enum {
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GFP_KERNEL,
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GFP_ATOMIC,
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} gfp_t;
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typedef enum {
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IRQ_NONE,
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IRQ_HANDLED
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} irqreturn_t;
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static inline void *kmalloc(size_t s, gfp_t gfp)
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{
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return malloc(s);
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}
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static inline void kfree(void *p)
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{
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free(p);
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}
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#define container_of(ptr, type, member) ({ \
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const typeof( ((type *)0)->member ) *__mptr = (ptr); \
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(type *)( (char *)__mptr - offsetof(type,member) );})
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#define uninitialized_var(x) x = x
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# ifndef likely
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# define likely(x) (__builtin_expect(!!(x), 1))
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# endif
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# ifndef unlikely
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# define unlikely(x) (__builtin_expect(!!(x), 0))
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# endif
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#define pr_err(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
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#ifdef DEBUG
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#define pr_debug(format, ...) fprintf (stderr, format, ## __VA_ARGS__)
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#else
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#define pr_debug(format, ...) do {} while (0)
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#endif
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#define dev_err(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
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#define dev_warn(dev, format, ...) fprintf (stderr, format, ## __VA_ARGS__)
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/* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
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#define list_add_tail(a, b) do {} while (0)
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#define list_del(a) do {} while (0)
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
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#define BITS_PER_BYTE 8
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#define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
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#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
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/* TODO: Not atomic as it should be:
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* we don't use this for anything important. */
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static inline void clear_bit(int nr, volatile unsigned long *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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*p &= ~mask;
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}
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static inline int test_bit(int nr, const volatile unsigned long *addr)
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{
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return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
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}
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/* The only feature we care to support */
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#define virtio_has_feature(dev, feature) \
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test_bit((feature), (dev)->features)
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/* end of stubs */
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struct virtio_device {
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void *dev;
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unsigned long features[1];
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};
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struct virtqueue {
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/* TODO: commented as list macros are empty stubs for now.
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* Broken but enough for virtio_ring.c
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* struct list_head list; */
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void (*callback)(struct virtqueue *vq);
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const char *name;
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struct virtio_device *vdev;
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void *priv;
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};
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#define EXPORT_SYMBOL_GPL(__EXPORT_SYMBOL_GPL_name) \
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void __EXPORT_SYMBOL_GPL##__EXPORT_SYMBOL_GPL_name() { \
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}
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#define MODULE_LICENSE(__MODULE_LICENSE_value) \
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const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value
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#define CONFIG_SMP
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#if defined(__i386__) || defined(__x86_64__)
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#define barrier() asm volatile("" ::: "memory")
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#define mb() __sync_synchronize()
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#define smp_mb() mb()
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# define smp_rmb() barrier()
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# define smp_wmb() barrier()
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#else
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#error Please fill in barrier macros
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#endif
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/* Interfaces exported by virtio_ring. */
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int virtqueue_add_buf_gfp(struct virtqueue *vq,
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struct scatterlist sg[],
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unsigned int out_num,
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unsigned int in_num,
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void *data,
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gfp_t gfp);
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static inline int virtqueue_add_buf(struct virtqueue *vq,
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struct scatterlist sg[],
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unsigned int out_num,
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unsigned int in_num,
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void *data)
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{
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return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
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}
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void virtqueue_kick(struct virtqueue *vq);
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void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
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void virtqueue_disable_cb(struct virtqueue *vq);
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bool virtqueue_enable_cb(struct virtqueue *vq);
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void *virtqueue_detach_unused_buf(struct virtqueue *vq);
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struct virtqueue *vring_new_virtqueue(unsigned int num,
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unsigned int vring_align,
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struct virtio_device *vdev,
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void *pages,
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void (*notify)(struct virtqueue *vq),
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void (*callback)(struct virtqueue *vq),
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const char *name);
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void vring_del_virtqueue(struct virtqueue *vq);
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#endif
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