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