1 /**
2 * \file sigma0/lib/src/kip.c
3 * \brief map kernel info page using sigma0 protocol
4 *
5 * \date 02/2006
6 * \author Adam Lackorzynski <adam@os.inf.tu-dresden.de>
7 * Frank Mehnert <fm3@os.inf.tu-dresden.de> */
8
9 /*
10 * (c) 2006-2009 Author(s)
11 * economic rights: Technische Universität Dresden (Germany)
12 * This file is part of TUD:OS and distributed under the terms of the
13 * GNU Lesser General Public License 2.1.
14 * Please see the COPYING-LGPL-2.1 file for details.
15 */
16
17 #include <l4/sys/ipc.h>
18 #include <l4/sigma0/sigma0.h>
19
20 L4_CV l4_kernel_info_t *
l4sigma0_map_kip(l4_cap_idx_t pager,void * adr,unsigned log2_size)21 l4sigma0_map_kip(l4_cap_idx_t pager, void *adr, unsigned log2_size)
22 {
23 l4_msgtag_t tag = l4_msgtag(L4_PROTO_SIGMA0, 1, 0, 0);
24 l4_utcb_t *utcb = l4_utcb();
25 l4_msg_regs_t *m = l4_utcb_mr_u(utcb);
26 l4_buf_regs_t *b = l4_utcb_br_u(utcb);
27
28 l4_addr_t addr = (l4_addr_t)adr & (~0ULL << log2_size);
29 m->mr[0] = SIGMA0_REQ_KIP;
30 b->bdr = 0;
31 b->br[0] = L4_ITEM_MAP;
32 b->br[1] = l4_fpage(addr, log2_size, L4_FPAGE_RX).raw;
33
34 tag = l4_ipc_call(pager, utcb, tag, L4_IPC_NEVER);
35 if (l4_ipc_error(tag, utcb))
36 return 0;
37
38 if (l4_msgtag_items(tag) != 1)
39 return 0;
40
41 l4_addr_t a = addr + (m->mr[0] & (~0UL << L4_PAGESHIFT) & ((1ULL << log2_size) - 1));
42
43 return (l4_kernel_info_t*)a;
44 }
45