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 */
47inline 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
56inline 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 */
62inline 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
71inline 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 */
77unsigned 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
102void 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
123double uniform_deviate(int seed)
124{
125	return seed * (1.0 / (RAND_MAX + 1.0));
126}
127#endif	/* _SELFTESTS_POWERPC_DSCR_DSCR_H */
128