source: trunk/packages/xen-3.1/xen-3.1/xen/arch/ia64/linux/sn/kernel/pio_phys.S @ 34

Last change on this file since 34 was 34, checked in by hartmans, 18 years ago

Add xen and xen-common

File size: 1.4 KB
Line 
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License.  See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2000-2005 Silicon Graphics, Inc. All rights reserved.
7 *
8 * This file contains macros used to access MMR registers via
9 * uncached physical addresses.
10 *      pio_phys_read_mmr  - read an MMR
11 *      pio_phys_write_mmr - write an MMR
12 *      pio_atomic_phys_write_mmrs - atomically write 1 or 2 MMRs with psr.ic=0
13 *              Second MMR will be skipped if address is NULL
14 *
15 * Addresses passed to these routines should be uncached physical addresses
16 *      ie., 0x80000....
17 */
18
19
20
21#include <asm/asmmacro.h>
22#include <asm/page.h>
23
24GLOBAL_ENTRY(pio_phys_read_mmr)
25        .prologue
26        .regstk 1,0,0,0
27        .body
28        mov r2=psr
29        rsm psr.i | psr.dt
30        ;;
31        srlz.d
32        ld8.acq r8=[r32]
33        ;;
34        mov psr.l=r2;;
35        srlz.d
36        br.ret.sptk.many rp
37END(pio_phys_read_mmr)
38
39GLOBAL_ENTRY(pio_phys_write_mmr)
40        .prologue
41        .regstk 2,0,0,0
42        .body
43        mov r2=psr
44        rsm psr.i | psr.dt
45        ;;
46        srlz.d
47        st8.rel [r32]=r33
48        ;;
49        mov psr.l=r2;;
50        srlz.d
51        br.ret.sptk.many rp
52END(pio_phys_write_mmr)
53
54GLOBAL_ENTRY(pio_atomic_phys_write_mmrs)
55        .prologue
56        .regstk 4,0,0,0
57        .body
58        mov r2=psr
59        cmp.ne p9,p0=r34,r0;
60        rsm psr.i | psr.dt | psr.ic
61        ;;
62        srlz.d
63        st8.rel [r32]=r33
64(p9)    st8.rel [r34]=r35
65        ;;
66        mov psr.l=r2;;
67        srlz.d
68        br.ret.sptk.many rp
69END(pio_atomic_phys_write_mmrs)
70
71
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