2 * \file sigma0/lib/src/kip.c
3 * \brief map kernel info page using sigma0 protocol
6 * \author Adam Lackorzynski <adam@os.inf.tu-dresden.de>
7 * Frank Mehnert <fm3@os.inf.tu-dresden.de> */
10 * (c) 2006-2009 Technische Universität Dresden
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>
20 * \return kip address, 0 on error
23 l4sigma0_map_kip(l4_cap_idx_t pager, void *adr, unsigned log2_size)
25 l4_msgtag_t tag = l4_msgtag(L4_PROTO_SIGMA0, 1, 0, 0);
26 l4_utcb_t *utcb = l4_utcb();
27 l4_msg_regs_t *m = l4_utcb_mr_u(utcb);
28 l4_buf_regs_t *b = l4_utcb_br_u(utcb);
30 l4_addr_t addr = (l4_addr_t)adr & (~0ULL << log2_size);
31 m->mr[0] = SIGMA0_REQ_KIP;
33 b->br[0] = L4_ITEM_MAP;
34 b->br[1] = l4_fpage(addr, log2_size, L4_FPAGE_RX).raw;
36 tag = l4_ipc_call(pager, utcb, tag, L4_IPC_NEVER);
37 if (l4_ipc_error(tag, utcb))
40 if (l4_msgtag_items(tag) != 1)
43 l4_addr_t a = addr + (m->mr[0] & (~0UL << L4_PAGESHIFT) & ((1ULL << log2_size)-1));
45 return (l4_kernel_info_t*)a;