2 * \file sigma0/lib/src/iomem.c
3 * \brief map any page using sigma0 protocol
6 * \author Frank Mehnert <fm3@os.inf.tu-dresden.de> */
9 * (c) 2006-2009 Author(s)
10 * economic rights: Technische Universität Dresden (Germany)
11 * This file is part of TUD:OS and distributed under the terms of the
12 * GNU Lesser General Public License 2.1.
13 * Please see the COPYING-LGPL-2.1 file for details.
16 #include <l4/sys/ipc.h>
17 #include <l4/sigma0/sigma0.h>
21 * Map one page anonymous memory.
23 * \param pager pager implementing the Sigma0 protocol
24 * \param map_area virtual address of the map area
25 * \param log2_map_size size of the map area
26 * \param sz Size to map from the server, in log2.
27 * \return #0 on success
28 * -#L4SIGMA0_IPCERROR IPC error
29 * -#L4SIGMA0_NOFPAGE no fpage received
32 l4sigma0_map_anypage(l4_cap_idx_t pager, l4_addr_t map_area,
33 unsigned log2_map_size, l4_addr_t *base, unsigned sz)
35 l4_msgtag_t tag = l4_msgtag(L4_PROTO_SIGMA0, 2, 0, 0);
36 l4_utcb_t *utcb = l4_utcb();
37 l4_msg_regs_t *m = l4_utcb_mr_u(utcb);
38 l4_buf_regs_t *b = l4_utcb_br_u(utcb);
40 m->mr[0] = SIGMA0_REQ_FPAGE_ANY;
41 m->mr[1] = l4_fpage(0, sz, 0).raw;
44 b->br[0] = L4_ITEM_MAP;
45 b->br[1] = l4_fpage(map_area, log2_map_size, L4_FPAGE_RWX).raw;
47 tag = l4_ipc_call(pager, utcb, tag, L4_IPC_NEVER);
48 if (l4_ipc_error(tag, utcb))
49 return -L4SIGMA0_IPCERROR;
51 if (l4_msgtag_items(tag) != 1)
52 return -L4SIGMA0_NOFPAGE;
54 *base = m->mr[0] & (~0UL << L4_PAGESHIFT);