void __init setup_physmem(unsigned long start, unsigned long reserve_end,
unsigned long len, unsigned long long highmem)
{
unsigned long reserve = reserve_end - start;
int pfn = PFN_UP(__pa(reserve_end));
int delta = (len - reserve) >> PAGE_SHIFT;
int err, offset, bootmap_size;
physmem_fd = create_mem_file(len + highmem);
offset = uml_reserved - uml_physmem;
err = os_map_memory((void *) uml_reserved, physmem_fd, offset,
len - offset, 1, 1, 1);
if (err < 0) {
printf("setup_physmem - mapping %ld bytes of memory at 0x%p "
"failed - errno = %d\n", len - offset,
(void *) uml_reserved, err);
exit(1);
}
/*
* Special kludge - This page will be mapped in to userspace processes
* from physmem_fd, so it needs to be written out there.
*/
os_seek_file(physmem_fd, __pa(&__syscall_stub_start));
os_write_file(physmem_fd, &__syscall_stub_start, PAGE_SIZE);
bootmap_size = init_bootmem(pfn, pfn + delta);
free_bootmem(__pa(reserve_end) + bootmap_size,
len - bootmap_size - reserve);
}
data = hppfs->contents;
off = *ppos;
while(off >= sizeof(data->contents)){
data = list_entry(data->list.next, struct hppfs_data,
list);
off -= sizeof(data->contents);
}
if(off + count > hppfs->len)
count = hppfs->len - off;
copy_to_user(buf, &data->contents[off], count);
*ppos += count;
}
else if(hppfs->host_fd != -1){
err = os_seek_file(hppfs->host_fd, *ppos);
if(err < 0){
printk("hppfs_read : seek failed, err = %d\n", -err);
return(err);
}
count = hppfs_read_file(hppfs->host_fd, buf, count);
if(count > 0)
*ppos += count;
}
else count = read_proc(&hppfs->proc_file, buf, count, ppos, 1);
return(count);
}
static ssize_t hppfs_write(struct file *file, const char *buf, size_t len,
loff_t *ppos)
