1/* $NetBSD: psl.h,v 1.19 2024/01/16 05:29:44 thorpej Exp $ */
2
3/*
4 * Copyright (c) 1982, 1986, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)psl.h 8.1 (Berkeley) 6/10/93
32 */
33
34#ifndef PSL_C
35/*
36 * MC68000 program status word
37 */
38
39#define PSL_C 0x0001 /* carry bit */
40#define PSL_V 0x0002 /* overflow bit */
41#define PSL_Z 0x0004 /* zero bit */
42#define PSL_N 0x0008 /* negative bit */
43#define PSL_X 0x0010 /* extend bit */
44#define PSL_ALLCC 0x001F /* all cc bits - unlikely */
45#define PSL_IPL0 0x0000 /* interrupt priority level 0 */
46#define PSL_IPL1 0x0100 /* interrupt priority level 1 */
47#define PSL_IPL2 0x0200 /* interrupt priority level 2 */
48#define PSL_IPL3 0x0300 /* interrupt priority level 3 */
49#define PSL_IPL4 0x0400 /* interrupt priority level 4 */
50#define PSL_IPL5 0x0500 /* interrupt priority level 5 */
51#define PSL_IPL6 0x0600 /* interrupt priority level 6 */
52#define PSL_IPL7 0x0700 /* interrupt priority level 7 */
53#define PSL_M 0x1000 /* master (kernel) sp vs intr sp */
54#define PSL_S 0x2000 /* supervisor enable bit */
55/* PSL_T0 0x4000 ??? T0 on 68020, 8000 is T1 */
56#define PSL_T 0x8000 /* trace enable bit */
57
58#define PSL_LOWIPL (PSL_S)
59#define PSL_HIGHIPL (PSL_S | PSL_IPL7)
60#define PSL_IPL (PSL_IPL7)
61#define PSL_USER (0)
62
63#define PSL_MBZ 0xFFFF58E0 /* must be zero bits */
64
65#define PSL_USERSET (0)
66#define PSL_USERCLR (PSL_S | PSL_IPL7 | PSL_MBZ)
67
68#define PSLTOIPL(x) (((x) >> 8) & 0x7)
69#define IPLTOPSL(x) ((((x) & 0x7) << 8) | PSL_S)
70
71#define USERMODE(ps) (((ps) & PSL_S) == 0)
72
73#if defined(_KERNEL) && !defined(_LOCORE)
74
75#define IPL_SAFEPRI PSL_LOWIPL /* for kern_sleepq.c */
76
77/*
78 * spl functions; platform-specific code must define spl0 and splx().
79 */
80
81static inline int
82getsr(void)
83{
84 int sr;
85
86 __asm volatile("clrl %0; movew %%sr,%0" : "=&d" (sr));
87
88 return sr;
89}
90
91static inline int
92_spl(int s)
93{
94 int sr;
95
96 __asm volatile ("clrl %0; movew %%sr,%0; movew %1,%%sr" :
97 "=&d" (sr) : "di" (s) : "memory");
98
99 return sr;
100}
101
102static inline void
103_splx(int s)
104{
105 __asm volatile("movew %0,%%sr" : : "di" (s) : "memory");
106}
107
108static inline int
109_splraise(int level)
110{
111 int sr;
112
113 __asm volatile("clrl %0; movew %%sr,%0" : "=&d" (sr));
114
115 if ((uint16_t)level >= PSL_HIGHIPL || (uint16_t)level > (uint16_t)sr)
116 __asm volatile("movew %0,%%sr" : : "di" (level) : "memory");
117
118 return sr;
119}
120
121/* spl0 may require checking for software interrupts */
122#define _spl0() _spl(PSL_S|PSL_IPL0)
123#define spl1() _spl(PSL_S|PSL_IPL1)
124#define spl2() _spl(PSL_S|PSL_IPL2)
125#define spl3() _spl(PSL_S|PSL_IPL3)
126#define spl4() _spl(PSL_S|PSL_IPL4)
127#define spl5() _spl(PSL_S|PSL_IPL5)
128#define spl6() _spl(PSL_S|PSL_IPL6)
129#define spl7() _spl(PSL_S|PSL_IPL7)
130
131#define splraise1() _splraise(PSL_S|PSL_IPL1)
132#define splraise2() _splraise(PSL_S|PSL_IPL2)
133#define splraise3() _splraise(PSL_S|PSL_IPL3)
134#define splraise4() _splraise(PSL_S|PSL_IPL4)
135#define splraise5() _splraise(PSL_S|PSL_IPL5)
136#define splraise6() _splraise(PSL_S|PSL_IPL6)
137#define splraise7() _splraise(PSL_S|PSL_IPL7)
138
139#endif /* _KERNEL && ! _LOCORE */
140#endif