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Linux kernel mirror (for testing)
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linux
1/*
2 * psr.h: This file holds the macros for masking off various parts of
3 * the processor status register on the Sparc. This is valid
4 * for Version 8. On the V9 this is renamed to the PSTATE
5 * register and its members are accessed as fields like
6 * PSTATE.PRIV for the current CPU privilege level.
7 *
8 * Copyright (C) 1994 David S. Miller (davem@caip.rutgers.edu)
9 */
10
11#ifndef __LINUX_SPARC_PSR_H
12#define __LINUX_SPARC_PSR_H
13
14/* The Sparc PSR fields are laid out as the following:
15 *
16 * ------------------------------------------------------------------------
17 * | impl | vers | icc | resv | EC | EF | PIL | S | PS | ET | CWP |
18 * | 31-28 | 27-24 | 23-20 | 19-14 | 13 | 12 | 11-8 | 7 | 6 | 5 | 4-0 |
19 * ------------------------------------------------------------------------
20 */
21#define PSR_CWP 0x0000001f /* current window pointer */
22#define PSR_ET 0x00000020 /* enable traps field */
23#define PSR_PS 0x00000040 /* previous privilege level */
24#define PSR_S 0x00000080 /* current privilege level */
25#define PSR_PIL 0x00000f00 /* processor interrupt level */
26#define PSR_EF 0x00001000 /* enable floating point */
27#define PSR_EC 0x00002000 /* enable co-processor */
28#define PSR_SYSCALL 0x00004000 /* inside of a syscall */
29#define PSR_LE 0x00008000 /* SuperSparcII little-endian */
30#define PSR_ICC 0x00f00000 /* integer condition codes */
31#define PSR_C 0x00100000 /* carry bit */
32#define PSR_V 0x00200000 /* overflow bit */
33#define PSR_Z 0x00400000 /* zero bit */
34#define PSR_N 0x00800000 /* negative bit */
35#define PSR_VERS 0x0f000000 /* cpu-version field */
36#define PSR_IMPL 0xf0000000 /* cpu-implementation field */
37
38#ifdef __KERNEL__
39
40#ifndef __ASSEMBLY__
41/* Get the %psr register. */
42static inline unsigned int get_psr(void)
43{
44 unsigned int psr;
45 __asm__ __volatile__(
46 "rd %%psr, %0\n\t"
47 "nop\n\t"
48 "nop\n\t"
49 "nop\n\t"
50 : "=r" (psr)
51 : /* no inputs */
52 : "memory");
53
54 return psr;
55}
56
57static inline void put_psr(unsigned int new_psr)
58{
59 __asm__ __volatile__(
60 "wr %0, 0x0, %%psr\n\t"
61 "nop\n\t"
62 "nop\n\t"
63 "nop\n\t"
64 : /* no outputs */
65 : "r" (new_psr)
66 : "memory", "cc");
67}
68
69/* Get the %fsr register. Be careful, make sure the floating point
70 * enable bit is set in the %psr when you execute this or you will
71 * incur a trap.
72 */
73
74extern unsigned int fsr_storage;
75
76static inline unsigned int get_fsr(void)
77{
78 unsigned int fsr = 0;
79
80 __asm__ __volatile__(
81 "st %%fsr, %1\n\t"
82 "ld %1, %0\n\t"
83 : "=r" (fsr)
84 : "m" (fsr_storage));
85
86 return fsr;
87}
88
89#endif /* !(__ASSEMBLY__) */
90
91#endif /* (__KERNEL__) */
92
93#endif /* !(__LINUX_SPARC_PSR_H) */