/* 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); }
int sys___msync13(struct lwp *l, const struct sys___msync13_args *uap, register_t *retval) { /* { syscallarg(void *) addr; syscallarg(size_t) len; syscallarg(int) flags; } */ struct proc *p = l->l_proc; vaddr_t addr; vsize_t size, pageoff; struct vm_map *map; int error, flags, uvmflags; bool rv; /* * extract syscall args from the uap */ addr = (vaddr_t)SCARG(uap, addr); size = (vsize_t)SCARG(uap, len); flags = SCARG(uap, flags); /* sanity check flags */ if ((flags & ~(MS_ASYNC | MS_SYNC | MS_INVALIDATE)) != 0 || (flags & (MS_ASYNC | MS_SYNC | MS_INVALIDATE)) == 0 || (flags & (MS_ASYNC | MS_SYNC)) == (MS_ASYNC | MS_SYNC)) return EINVAL; if ((flags & (MS_ASYNC | MS_SYNC)) == 0) flags |= MS_SYNC; /* * 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); /* * get map */ map = &p->p_vmspace->vm_map; error = range_test(map, addr, size, false); if (error) return ENOMEM; /* * XXXCDC: do we really need this semantic? * * XXX Gak! If size is zero we are supposed to sync "all modified * pages with the region containing addr". Unfortunately, we * don't really keep track of individual mmaps so we approximate * by flushing the range of the map entry containing addr. * This can be incorrect if the region splits or is coalesced * with a neighbor. */ if (size == 0) { struct vm_map_entry *entry; vm_map_lock_read(map); rv = uvm_map_lookup_entry(map, addr, &entry); if (rv == true) { addr = entry->start; size = entry->end - entry->start; } vm_map_unlock_read(map); if (rv == false) return EINVAL; } /* * translate MS_ flags into PGO_ flags */ uvmflags = PGO_CLEANIT; if (flags & MS_INVALIDATE) uvmflags |= PGO_FREE; if (flags & MS_SYNC) uvmflags |= PGO_SYNCIO; error = uvm_map_clean(map, addr, addr+size, uvmflags); return error; }
int sys_msync(struct proc *p, void *v, register_t *retval) { struct sys_msync_args /* { syscallarg(void *) addr; syscallarg(size_t) len; syscallarg(int) flags; } */ *uap = v; vaddr_t addr; vsize_t size, pageoff; vm_map_t map; int rv, flags, uvmflags; /* * extract syscall args from the uap */ addr = (vaddr_t)SCARG(uap, addr); size = (vsize_t)SCARG(uap, len); flags = SCARG(uap, flags); /* sanity check flags */ if ((flags & ~(MS_ASYNC | MS_SYNC | MS_INVALIDATE)) != 0 || (flags & (MS_ASYNC | MS_SYNC | MS_INVALIDATE)) == 0 || (flags & (MS_ASYNC | MS_SYNC)) == (MS_ASYNC | MS_SYNC)) return (EINVAL); if ((flags & (MS_ASYNC | MS_SYNC)) == 0) flags |= MS_SYNC; /* * 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. */ /* * get map */ map = &p->p_vmspace->vm_map; /* * XXXCDC: do we really need this semantic? * * XXX Gak! If size is zero we are supposed to sync "all modified * pages with the region containing addr". Unfortunately, we * don't really keep track of individual mmaps so we approximate * by flushing the range of the map entry containing addr. * This can be incorrect if the region splits or is coalesced * with a neighbor. */ if (size == 0) { vm_map_entry_t entry; vm_map_lock_read(map); rv = uvm_map_lookup_entry(map, addr, &entry); if (rv == TRUE) { addr = entry->start; size = entry->end - entry->start; } vm_map_unlock_read(map); if (rv == FALSE) return (EINVAL); } /* * translate MS_ flags into PGO_ flags */ uvmflags = PGO_CLEANIT; if (flags & MS_INVALIDATE) uvmflags |= PGO_FREE; if (flags & MS_SYNC) uvmflags |= PGO_SYNCIO; else uvmflags |= PGO_SYNCIO; /* XXXCDC: force sync for now! */ return (uvm_map_clean(map, addr, addr+size, uvmflags)); }