diff options
Diffstat (limited to 'sys/kern/subr_uio.c')
| -rw-r--r-- | sys/kern/subr_uio.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/sys/kern/subr_uio.c b/sys/kern/subr_uio.c index 77156f1..8304aea 100644 --- a/sys/kern/subr_uio.c +++ b/sys/kern/subr_uio.c @@ -44,13 +44,16 @@ __FBSDID("$FreeBSD$"); #include <sys/kernel.h> #include <sys/limits.h> #include <sys/lock.h> +#include <sys/mman.h> #include <sys/mutex.h> #include <sys/proc.h> +#include <sys/resourcevar.h> #include <sys/sched.h> #include <sys/sysctl.h> #include <sys/vnode.h> #include <vm/vm.h> +#include <vm/vm_extern.h> #include <vm/vm_page.h> #include <vm/vm_map.h> #ifdef ZERO_COPY_SOCKETS @@ -457,3 +460,49 @@ cloneuio(struct uio *uiop) bcopy(uiop->uio_iov, uio->uio_iov, iovlen); return (uio); } + +/* + * Map some anonymous memory in user space of size sz, rounded up to the page + * boundary. + */ +int +copyout_map(struct thread *td, vm_offset_t *addr, size_t sz) +{ + struct vmspace *vms = td->td_proc->p_vmspace; + int error; + vm_size_t size; + + /* + * Map somewhere after heap in process memory. + */ + PROC_LOCK(td->td_proc); + *addr = round_page((vm_offset_t)vms->vm_daddr + + lim_max(td->td_proc, RLIMIT_DATA)); + PROC_UNLOCK(td->td_proc); + + /* round size up to page boundry */ + size = (vm_size_t) round_page(sz); + + error = vm_mmap(&vms->vm_map, addr, size, PROT_READ | PROT_WRITE, + VM_PROT_ALL, MAP_PRIVATE | MAP_ANON, OBJT_DEFAULT, NULL, 0); + + return (error); +} + +/* + * Unmap memory in user space. + */ +int +copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz) +{ + vm_map_t map; + vm_size_t size; + + map = &td->td_proc->p_vmspace->vm_map; + size = (vm_size_t) round_page(sz); + + if (!vm_map_remove(map, addr, addr + size)) + return (EINVAL); + + return (0); +} |
