xref: /titanic_41/usr/src/uts/sun4u/io/pci/pci_asm.s (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
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*/
43int pci_do_phys_peek(size_t size, uint64_t paddr, uint64_t *value, int type)
44{ return (0); }
45
46int 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
168