static int shared_copy(struct vir_region *vr, struct vir_region *newvr)
{
struct vmproc *vmp;
struct vir_region *srcvr;
if(getsrc(vr, &vmp, &srcvr) != OK)
panic("copy: original getsrc failed");
shared_setsource(newvr, vr->param.shared.ep, srcvr);
return OK;
}
/*===========================================================================*
* do_remap *
*===========================================================================*/
int do_remap(message *m)
{
int dn, sn;
vir_bytes da, sa;
size_t size;
u32_t flags;
struct vir_region *src_region, *vr;
struct vmproc *dvmp, *svmp;
int r;
int readonly;
if(m->m_type == VM_REMAP)
readonly = 0;
else if(m->m_type == VM_REMAP_RO)
readonly = 1;
else panic("do_remap: can't be");
da = (vir_bytes) m->m_lsys_vm_vmremap.dest_addr;
sa = (vir_bytes) m->m_lsys_vm_vmremap.src_addr;
size = m->m_lsys_vm_vmremap.size;
if (size <= 0) return EINVAL;
if ((r = vm_isokendpt((endpoint_t) m->m_lsys_vm_vmremap.destination, &dn)) != OK)
return EINVAL;
if ((r = vm_isokendpt((endpoint_t) m->m_lsys_vm_vmremap.source, &sn)) != OK)
return EINVAL;
dvmp = &vmproc[dn];
svmp = &vmproc[sn];
if (!(src_region = map_lookup(svmp, sa, NULL)))
return EINVAL;
if(src_region->vaddr != sa) {
printf("VM: do_remap: not start of region.\n");
return EFAULT;
}
if (size % VM_PAGE_SIZE)
size += VM_PAGE_SIZE - size % VM_PAGE_SIZE;
if(size != src_region->length) {
printf("VM: do_remap: not size of region.\n");
return EFAULT;
}
flags = VR_SHARED;
if(!readonly)
flags |= VR_WRITABLE;
if(da)
vr = map_page_region(dvmp, da, 0, size, flags, 0,
&mem_type_shared);
else
vr = map_page_region(dvmp, 0, VM_DATATOP, size, flags, 0,
&mem_type_shared);
if(!vr) {
printf("VM: re-map of shared area failed\n");
return ENOMEM;
}
shared_setsource(vr, svmp->vm_endpoint, src_region);
m->m_lsys_vm_vmremap.ret_addr = (void *) vr->vaddr;
return OK;
}