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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* POWER Data Stream Control Register (DSCR)
*
* This header file contains helper functions and macros
* required for all the DSCR related test cases.
*
* Copyright 2012, Anton Blanchard, IBM Corporation.
* Copyright 2015, Anshuman Khandual, IBM Corporation.
*/
#ifndef _SELFTESTS_POWERPC_DSCR_DSCR_H
#define _SELFTESTS_POWERPC_DSCR_DSCR_H
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <dirent.h>
#include <pthread.h>
#include <sched.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "utils.h"
#define THREADS 100 /* Max threads */
#define COUNT 100 /* Max iterations */
#define DSCR_MAX 16 /* Max DSCR value */
#define LEN_MAX 100 /* Max name length */
#define DSCR_DEFAULT "/sys/devices/system/cpu/dscr_default"
#define CPU_PATH "/sys/devices/system/cpu/"
#define rmb() asm volatile("lwsync":::"memory")
#define wmb() asm volatile("lwsync":::"memory")
#define READ_ONCE(x) (*(volatile typeof(x) *)&(x))
/* Prilvilege state DSCR access */
inline unsigned long get_dscr(void)
{
unsigned long ret;
asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR_PRIV));
return ret;
}
inline void set_dscr(unsigned long val)
{
asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR_PRIV));
}
/* Problem state DSCR access */
inline unsigned long get_dscr_usr(void)
{
unsigned long ret;
asm volatile("mfspr %0,%1" : "=r" (ret) : "i" (SPRN_DSCR));
return ret;
}
inline void set_dscr_usr(unsigned long val)
{
asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
}
/* Default DSCR access */
unsigned long get_default_dscr(void)
{
int fd = -1, ret;
char buf[16];
unsigned long val;
if (fd == -1) {
fd = open(DSCR_DEFAULT, O_RDONLY);
if (fd == -1) {
perror("open() failed");
exit(1);
}
}
memset(buf, 0, sizeof(buf));
lseek(fd, 0, SEEK_SET);
ret = read(fd, buf, sizeof(buf));
if (ret == -1) {
perror("read() failed");
exit(1);
}
sscanf(buf, "%lx", &val);
close(fd);
return val;
}
void set_default_dscr(unsigned long val)
{
int fd = -1, ret;
char buf[16];
if (fd == -1) {
fd = open(DSCR_DEFAULT, O_RDWR);
if (fd == -1) {
perror("open() failed");
exit(1);
}
}
sprintf(buf, "%lx\n", val);
ret = write(fd, buf, strlen(buf));
if (ret == -1) {
perror("write() failed");
exit(1);
}
close(fd);
}
double uniform_deviate(int seed)
{
return seed * (1.0 / (RAND_MAX + 1.0));
}
#endif /* _SELFTESTS_POWERPC_DSCR_DSCR_H */
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