1 /*
2 * POWER Data Stream Control Register (DSCR)
3 *
4 * This header file contains helper functions and macros
5 * required for all the DSCR related test cases.
6 *
7 * Copyright 2012, Anton Blanchard, IBM Corporation.
8 * Copyright 2015, Anshuman Khandual, IBM Corporation.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published
12 * by the Free Software Foundation.
13 */
14 #ifndef _SELFTESTS_POWERPC_DSCR_DSCR_H
15 #define _SELFTESTS_POWERPC_DSCR_DSCR_H
16
17 #include <unistd.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <fcntl.h>
22 #include <dirent.h>
23 #include <pthread.h>
24 #include <sched.h>
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <sys/wait.h>
28
29 #include "utils.h"
30
31 #define SPRN_DSCR 0x11 /* Privilege state SPR */
32 #define SPRN_DSCR_USR 0x03 /* Problem state SPR */
33 #define THREADS 100 /* Max threads */
34 #define COUNT 100 /* Max iterations */
35 #define DSCR_MAX 16 /* Max DSCR value */
36 #define LEN_MAX 100 /* Max name length */
37
38 #define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default"
39 #define CPU_PATH "/sys/devices/system/cpu/"
40
41 #define rmb() asm volatile("lwsync":::"memory")
42 #define wmb() asm volatile("lwsync":::"memory")
43
44 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
45
46 /* Prilvilege state DSCR access */
get_dscr(void)47 inline unsigned long get_dscr(void)
48 {
49 unsigned long ret;
50
51 asm volatile("mfspr %0,%1" : "=r" (ret): "i" (SPRN_DSCR));
52
53 return ret;
54 }
55
set_dscr(unsigned long val)56 inline void set_dscr(unsigned long val)
57 {
58 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
59 }
60
61 /* Problem state DSCR access */
get_dscr_usr(void)62 inline unsigned long get_dscr_usr(void)
63 {
64 unsigned long ret;
65
66 asm volatile("mfspr %0,%1" : "=r" (ret): "i" (SPRN_DSCR_USR));
67
68 return ret;
69 }
70
set_dscr_usr(unsigned long val)71 inline void set_dscr_usr(unsigned long val)
72 {
73 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR_USR));
74 }
75
76 /* Default DSCR access */
get_default_dscr(void)77 unsigned long get_default_dscr(void)
78 {
79 int fd = -1, ret;
80 char buf[16];
81 unsigned long val;
82
83 if (fd == -1) {
84 fd = open(DSCR_DEFAULT, O_RDONLY);
85 if (fd == -1) {
86 perror("open() failed");
87 exit(1);
88 }
89 }
90 memset(buf, 0, sizeof(buf));
91 lseek(fd, 0, SEEK_SET);
92 ret = read(fd, buf, sizeof(buf));
93 if (ret == -1) {
94 perror("read() failed");
95 exit(1);
96 }
97 sscanf(buf, "%lx", &val);
98 close(fd);
99 return val;
100 }
101
set_default_dscr(unsigned long val)102 void set_default_dscr(unsigned long val)
103 {
104 int fd = -1, ret;
105 char buf[16];
106
107 if (fd == -1) {
108 fd = open(DSCR_DEFAULT, O_RDWR);
109 if (fd == -1) {
110 perror("open() failed");
111 exit(1);
112 }
113 }
114 sprintf(buf, "%lx\n", val);
115 ret = write(fd, buf, strlen(buf));
116 if (ret == -1) {
117 perror("write() failed");
118 exit(1);
119 }
120 close(fd);
121 }
122
uniform_deviate(int seed)123 double uniform_deviate(int seed)
124 {
125 return seed * (1.0 / (RAND_MAX + 1.0));
126 }
127 #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */
128