/* ARGSUSED */
int
sys_madvise(struct lwp *l, const struct sys_madvise_args *uap,
register_t *retval)
{
/* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(int) behav;
} */
struct proc *p = l->l_proc;
vaddr_t addr;
vsize_t size, pageoff;
int advice, error;
addr = (vaddr_t)SCARG(uap, addr);
size = (vsize_t)SCARG(uap, len);
advice = SCARG(uap, behav);
/*
* align the address to a page boundary, and adjust the size accordingly
*/
pageoff = (addr & PAGE_MASK);
addr -= pageoff;
size += pageoff;
size = (vsize_t)round_page(size);
error = range_test(&p->p_vmspace->vm_map, addr, size, false);
if (error)
return EINVAL;
switch (advice) {
case MADV_NORMAL:
case MADV_RANDOM:
case MADV_SEQUENTIAL:
error = uvm_map_advice(&p->p_vmspace->vm_map, addr, addr + size,
advice);
break;
case MADV_WILLNEED:
/*
* Activate all these pages, pre-faulting them in if
* necessary.
*/
error = uvm_map_willneed(&p->p_vmspace->vm_map,
addr, addr + size);
break;
case MADV_DONTNEED:
/*
* Deactivate all these pages. We don't need them
* any more. We don't, however, toss the data in
* the pages.
*/
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,
PGO_DEACTIVATE);
break;
case MADV_FREE:
/*
* These pages contain no valid data, and may be
* garbage-collected. Toss all resources, including
* any swap space in use.
*/
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,
PGO_FREE);
break;
case MADV_SPACEAVAIL:
/*
* XXXMRG What is this? I think it's:
*
* Ensure that we have allocated backing-store
* for these pages.
*
* This is going to require changes to the page daemon,
* as it will free swap space allocated to pages in core.
* There's also what to do for device/file/anonymous memory.
*/
return EINVAL;
default:
return EINVAL;
}
return error;
}
/* ARGSUSED */
int
sys_madvise(struct proc *p, void *v, register_t *retval)
{
struct sys_madvise_args /* {
syscallarg(void *) addr;
syscallarg(size_t) len;
syscallarg(int) behav;
} */ *uap = v;
vaddr_t addr;
vsize_t size, pageoff;
int advice, error;
addr = (vaddr_t)SCARG(uap, addr);
size = (vsize_t)SCARG(uap, len);
advice = SCARG(uap, behav);
/*
* align the address to a page boundary, and adjust the size accordingly
*/
ALIGN_ADDR(addr, size, pageoff);
if (addr > SIZE_MAX - size)
return (EINVAL); /* disallow wrap-around. */
switch (advice) {
case MADV_NORMAL:
case MADV_RANDOM:
case MADV_SEQUENTIAL:
error = uvm_map_advice(&p->p_vmspace->vm_map, addr,
addr + size, advice);
break;
case MADV_WILLNEED:
/*
* Activate all these pages, pre-faulting them in if
* necessary.
*/
/*
* XXX IMPLEMENT ME.
* Should invent a "weak" mode for uvm_fault()
* which would only do the PGO_LOCKED pgo_get().
*/
return (0);
case MADV_DONTNEED:
/*
* Deactivate all these pages. We don't need them
* any more. We don't, however, toss the data in
* the pages.
*/
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,
PGO_DEACTIVATE);
break;
case MADV_FREE:
/*
* These pages contain no valid data, and may be
* garbage-collected. Toss all resources, including
* any swap space in use.
*/
error = uvm_map_clean(&p->p_vmspace->vm_map, addr, addr + size,
PGO_FREE);
break;
case MADV_SPACEAVAIL:
/*
* XXXMRG What is this? I think it's:
*
* Ensure that we have allocated backing-store
* for these pages.
*
* This is going to require changes to the page daemon,
* as it will free swap space allocated to pages in core.
* There's also what to do for device/file/anonymous memory.
*/
return (EINVAL);
default:
return (EINVAL);
}
return (error);
}
