ssize_t
write(int fdnum, const void *buf, size_t n)
{
int r;
struct Dev *dev;
struct Fd *fd;
if ((r = fd_lookup(fdnum, &fd)) < 0
|| (r = dev_lookup(fd->fd_dev_id, &dev)) < 0)
return r;
if ((fd->fd_omode & O_ACCMODE) == O_RDONLY) {
cprintf("[%08x] write %d -- bad mode\n", thisenv->env_id, fdnum);
return -E_INVAL;
}
if (debug)
cprintf("write %d %p %d via dev %s\n",
fdnum, buf, n, dev->dev_name);
if (!dev->dev_write)
return -E_NOT_SUPP;
return (*dev->dev_write)(fd, buf, n);
}
ssize_t
read(int fdnum, void *buf, size_t n)
{
int r;
struct Dev *dev;
struct Fd *fd;
struct Stat statbuf;
if ((r = fd_lookup(fdnum, &fd)) < 0
|| (r = dev_lookup(fd->fd_dev_id, &dev)) < 0)
return r;
if ((fd->fd_omode & O_ACCMODE) == O_WRONLY) {
cprintf("[%08x] read %d -- bad mode\n", thisenv->env_id, fdnum);
return -E_INVAL;
}
if (!dev->dev_read)
return -E_NOT_SUPP;
return (*dev->dev_read)(fd, buf, n);
}
/*
* MTS mapping.
*
* It is NOT inlined since it triggers a GCC bug on my config (x86, GCC 3.3.5)
*/
static no_inline MTS_ENTRY *
MTS_PROTO(map)(cpu_mips_t *cpu,u_int op_type,mts_map_t *map,
MTS_ENTRY *entry,MTS_ENTRY *alt_entry)
{
struct vdevice *dev;
m_uint32_t offset;
m_iptr_t host_ptr;
int cow;
if (!(dev = dev_lookup(cpu->vm,map->paddr,map->cached)))
return NULL;
if (dev->flags & VDEVICE_FLAG_SPARSE) {
host_ptr = dev_sparse_get_host_addr(cpu->vm,dev,map->paddr,op_type,&cow);
entry->gvpa = map->vaddr;
entry->gppa = map->paddr;
entry->hpa = host_ptr;
entry->flags = (cow) ? MTS_FLAG_COW : 0;
return entry;
}
if (!dev->host_addr || (dev->flags & VDEVICE_FLAG_NO_MTS_MMAP)) {
offset = (map->paddr + map->offset) - dev->phys_addr;
/* device entries are never stored in virtual TLB */
alt_entry->hpa = (dev->id << MTS_DEVID_SHIFT) + offset;
alt_entry->flags = MTS_FLAG_DEV;
return alt_entry;
}
entry->gvpa = map->vaddr;
entry->gppa = map->paddr;
entry->hpa = dev->host_addr + (map->paddr - dev->phys_addr);
entry->flags = 0;
return entry;
}