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 THREADS 100 /* Max threads */
32 #define COUNT 100 /* Max iterations */
33 #define DSCR_MAX 16 /* Max DSCR value */
34 #define LEN_MAX 100 /* Max name length */
35
36 #define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default"
37 #define CPU_PATH "/sys/devices/system/cpu/"
38
39 #define rmb() asm volatile("lwsync":::"memory")
40 #define wmb() asm volatile("lwsync":::"memory")
41
42 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
43
44 /* Prilvilege state DSCR access */
get_dscr(void)45 inline unsigned long get_dscr(void)
46 {
47 unsigned long ret;
48
49 asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR_PRIV));
50
51 return ret;
52 }
53
set_dscr(unsigned long val)54 inline void set_dscr(unsigned long val)
55 {
56 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR_PRIV));
57 }
58
59 /* Problem state DSCR access */
get_dscr_usr(void)60 inline unsigned long get_dscr_usr(void)
61 {
62 unsigned long ret;
63
64 asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR));
65
66 return ret;
67 }
68
set_dscr_usr(unsigned long val)69 inline void set_dscr_usr(unsigned long val)
70 {
71 asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
72 }
73
74 /* Default DSCR access */
get_default_dscr(void)75 unsigned long get_default_dscr(void)
76 {
77 int fd = -1, ret;
78 char buf[16];
79 unsigned long val;
80
81 if (fd == -1) {
82 fd = open(DSCR_DEFAULT, O_RDONLY);
83 if (fd == -1) {
84 perror("open() failed");
85 exit(1);
86 }
87 }
88 memset(buf, 0, sizeof(buf));
89 lseek(fd, 0, SEEK_SET);
90 ret = read(fd, buf, sizeof(buf));
91 if (ret == -1) {
92 perror("read() failed");
93 exit(1);
94 }
95 sscanf(buf, "%lx", &val);
96 close(fd);
97 return val;
98 }
99
set_default_dscr(unsigned long val)100 void set_default_dscr(unsigned long val)
101 {
102 int fd = -1, ret;
103 char buf[16];
104
105 if (fd == -1) {
106 fd = open(DSCR_DEFAULT, O_RDWR);
107 if (fd == -1) {
108 perror("open() failed");
109 exit(1);
110 }
111 }
112 sprintf(buf, "%lx\n", val);
113 ret = write(fd, buf, strlen(buf));
114 if (ret == -1) {
115 perror("write() failed");
116 exit(1);
117 }
118 close(fd);
119 }
120
uniform_deviate(int seed)121 double uniform_deviate(int seed)
122 {
123 return seed * (1.0 / (RAND_MAX + 1.0));
124 }
125 #endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */
126