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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 IBM Corporation.
*/
#define __SANE_USERSPACE_TYPES__
#include <sys/types.h>
#include <stdint.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "utils.h"
#include "flush_utils.h"
static inline __u64 load(void *addr)
{
__u64 tmp;
asm volatile("ld %0,0(%1)" : "=r"(tmp) : "b"(addr));
return tmp;
}
void syscall_loop(char *p, unsigned long iterations,
unsigned long zero_size)
{
for (unsigned long i = 0; i < iterations; i++) {
for (unsigned long j = 0; j < zero_size; j += CACHELINE_SIZE)
load(p + j);
getppid();
}
}
static void sigill_handler(int signr, siginfo_t *info, void *unused)
{
static int warned;
ucontext_t *ctx = (ucontext_t *)unused;
unsigned long *pc = &UCONTEXT_NIA(ctx);
/* mtspr 3,RS to check for move to DSCR below */
if ((*((unsigned int *)*pc) & 0xfc1fffff) == 0x7c0303a6) {
if (!warned++)
printf("WARNING: Skipping over dscr setup. Consider running 'ppc64_cpu --dscr=1' manually.\n");
*pc += 4;
} else {
printf("SIGILL at %p\n", pc);
abort();
}
}
void set_dscr(unsigned long val)
{
static int init;
struct sigaction sa;
if (!init) {
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = sigill_handler;
sa.sa_flags = SA_SIGINFO;
if (sigaction(SIGILL, &sa, NULL))
perror("sigill_handler");
init = 1;
}
asm volatile("mtspr %1,%0" : : "r" (val), "i" (SPRN_DSCR));
}
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