xref: /illumos-gate/usr/src/uts/sun4u/io/px/px_asm_4u.S (revision 0ccfe5834c3b867c1b6c273cae02ec8922bc0fd2)
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/*
28 * Assembly language support for px driver
29 */
30
31#include <sys/asm_linkage.h>
32#include <sys/machthread.h>
33#include <sys/privregs.h>
34
35/*LINTLIBRARY*/
36
37! px_phys_peek_4u: Do physical address read.
38!
39! %o0 is size in bytes - Must be 8, 4, 2 or 1.  Invalid sizes default to 1.
40! %o1 is address to read
41! %o2 is address to save value into
42! %o3 is 0 for little endian, non-zero for big endian
43!
44! To be called from an on_trap environment.
45! Interrupts will be disabled for the duration of the read, to prevent
46! an interrupt from raising the trap level to 1 and then a possible
47! data access exception being delivered while the trap level > 0.
48!
49! Always returns success (0) in %o0
50!
51! Assumes alignment is correct and that on_trap handling has been installed
52
53	ENTRY(px_phys_peek_4u)
54
55	rdpr	%pstate, %o4		! Disable interrupts if not already
56	andcc	%o4, PSTATE_IE, %g2	! Save original state first
57	bz	.peek_ints_disabled
58	nop
59	wrpr	%o4, PSTATE_IE, %pstate
60.peek_ints_disabled:
61
62	tst	%o3			! Set up %asi with modifier for
63	movz	%xcc, ASI_IOL, %g1	! Big/little endian physical space
64	movnz	%xcc, ASI_IO, %g1
65	mov	%g1, %asi
66
67	cmp	%o0, 8			! 64-bit?
68	bne	.peek_int
69	cmp	%o0, 4			! 32-bit?
70	ldxa	[%o1]%asi, %g1
71	ba	.peekdone
72	stx	%g1, [%o2]
73
74.peek_int:
75	bne	.peek_half
76	cmp	%o0, 2			! 16-bit?
77	lduwa	[%o1]%asi, %g1
78	ba	.peekdone
79	stuw	%g1, [%o2]
80
81.peek_half:
82	bne	.peek_byte
83	nop
84	lduha	[%o1]%asi, %g1
85	ba	.peekdone
86	stuh	%g1, [%o2]
87
88.peek_byte:
89	lduba	[%o1]%asi, %g1	! 8-bit!
90	stub	%g1, [%o2]
91
92.peekdone:
93	membar	#Sync			! Make sure the loads take
94	tst	%g2			! No need to reenable interrupts
95	bz	.peek_ints_done		! 	if not enabled at entry
96	rdpr	%pstate, %o4
97	wrpr	%o4, PSTATE_IE, %pstate
98.peek_ints_done:
99	mov     %g0, %o0
100	retl
101	nop
102	SET_SIZE(px_phys_peek_4u)
103
104
105! px_phys_poke_4u: Do physical address write.
106!
107! %o0 is size in bytes - Must be 8, 4, 2 or 1.  Invalid sizes default to 1.
108! %o1 is address to write to
109! %o2 is address to read from
110! %o3 is 0 for little endian, non-zero for big endian
111!
112! Always returns success (0) in %o0
113!
114! Assumes alignment is correct and that on_trap handling has been installed
115
116	ENTRY(px_phys_poke_4u)
117
118	tst	%o3
119	movz	%xcc, ASI_IOL, %g1	! Big/little endian physical space
120	movnz	%xcc, ASI_IO, %g1
121	mov	%g1, %asi
122
123	cmp	%o0, 8			! 64 bit?
124	bne	.poke_int
125	cmp	%o0, 4			! 32-bit?
126	ldx	[%o2], %g1
127	ba	.pokedone
128	stxa	%g1, [%o1]%asi
129
130.poke_int:
131	bne	.poke_half
132	cmp	%o0, 2			! 16-bit?
133	lduw	[%o2], %g1
134	ba	.pokedone
135	stuwa	%g1, [%o1]%asi
136
137.poke_half:
138	bne	.poke_byte
139	nop
140	lduh	[%o2], %g1
141	ba	.pokedone
142	stuha	%g1, [%o1]%asi
143
144.poke_byte:
145	ldub	[%o2], %g1		! 8-bit!
146	stuba	%g1, [%o1]%asi
147
148.pokedone:
149	membar	#Sync
150	retl
151	mov	%g0, %o0
152	SET_SIZE(px_phys_poke_4u)
153
154