1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #pragma ident "%Z%%M% %I% %E% SMI"
28
29 /*
30 * Assembly language support for physical big/little endian access of pcitool
31 * in the PCI drivers.
32 */
33
34 #include <sys/asm_linkage.h>
35 #include <sys/machthread.h>
36 #include <sys/privregs.h>
37
38 /*LINTLIBRARY*/
39
40 #if defined(lint)
41
42 /*ARGSUSED*/
43 int pci_do_phys_peek(size_t size, uint64_t paddr, uint64_t *value, int type)
44 { return (0); }
45
46 int pci_do_phys_poke(size_t size, uint64_t paddr, uint64_t *value, int type)
47 { return (0); }
48
49 #else /* lint */
50
51 ! pci_do_phys_peek: Do physical address read.
52 !
53 ! %o0 is size in bytes - Must be 8, 4, 2 or 1. Invalid sizes default to 1.
54 ! %o1 is address to read
55 ! %o2 is address to save value into
56 ! %o3 is 0 for little endian, non-zero for big endian
57 !
58 ! To be called from an on_trap environment.
59 ! Interrupts will be disabled for the duration of the read, to prevent
60 ! an interrupt from raising the trap level to 1 and then a possible
61 ! data access exception being delivered while the trap level > 0.
62 !
63 ! Assumes alignment is correct.
64
65 ENTRY(pci_do_phys_peek)
66
67 rdpr %pstate, %o4 ! Disable interrupts if not already
68 andcc %o4, PSTATE_IE, %g2 ! Save original state first
69 bz .peek_ints_disabled
70 nop
71 wrpr %o4, PSTATE_IE, %pstate
72 .peek_ints_disabled:
73
74 tst %o3 ! Set up %asi with modifier for
75 movz %xcc, ASI_IOL, %g1 ! Big/little endian physical space
76 movnz %xcc, ASI_IO, %g1
77 mov %g1, %asi
78
79 cmp %o0, 8 ! 64-bit?
80 bne .peek_int
81 cmp %o0, 4 ! 32-bit?
82 ldxa [%o1]%asi, %g1
83 ba .peekdone
84 stx %g1, [%o2]
85
86 .peek_int:
87 bne .peek_half
88 cmp %o0, 2 ! 16-bit?
89 lduwa [%o1]%asi, %g1
90 ba .peekdone
91 stuw %g1, [%o2]
92
93 .peek_half:
94 bne .peek_byte
95 nop
96 lduha [%o1]%asi, %g1
97 ba .peekdone
98 stuh %g1, [%o2]
99
100 .peek_byte:
101 lduba [%o1]%asi, %g1 ! 8-bit!
102 stub %g1, [%o2]
103
104 .peekdone:
105 membar #Sync ! Make sure the loads take
106 tst %g2 ! No need to reenable interrupts
107 bz .peek_ints_done ! if not enabled at entry
108 rdpr %pstate, %o4
109 wrpr %o4, PSTATE_IE, %pstate
110 .peek_ints_done:
111 mov %g0, %o0
112 retl
113 nop
114 SET_SIZE(pci_do_phys_peek)
115
116
117 ! pci_do_phys_poke: Do physical address write.
118 !
119 ! %o0 is size in bytes - Must be 8, 4, 2 or 1. Invalid sizes default to 1.
120 ! %o1 is address to write to
121 ! %o2 is address to read from
122 ! %o3 is 0 for little endian, non-zero for big endian
123 !
124 ! Always returns success (0) in %o0
125 !
126 ! Assumes alignment is correct and that on_trap handling has been installed
127
128 ENTRY(pci_do_phys_poke)
129
130 tst %o3
131 bz .poke_asi_set
132 mov ASI_IOL, %asi
133 mov ASI_IO, %asi
134 .poke_asi_set:
135
136 cmp %o0, 8 ! 64 bit?
137 bne .poke_int
138 cmp %o0, 4 ! 32-bit?
139 ldx [%o2], %g1
140 ba .pokedone
141 stxa %g1, [%o1]%asi
142
143 .poke_int:
144 bne .poke_half
145 cmp %o0, 2 ! 16-bit?
146 lduw [%o2], %g1
147 ba .pokedone
148 stuwa %g1, [%o1]%asi
149
150 .poke_half:
151 bne .poke_byte
152 nop
153 lduh [%o2], %g1
154 ba .pokedone
155 stuha %g1, [%o1]%asi
156
157 .poke_byte:
158 ldub [%o2], %g1 ! 8-bit!
159 stuba %g1, [%o1]%asi
160
161 .pokedone:
162 membar #Sync
163 retl
164 mov %g0, %o0
165 SET_SIZE(pci_do_phys_poke)
166
167 #endif