Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2015, Michael Neuling, IBM Corp.
 * Original: Michael Neuling 19/7/2013
 * Edited: Rashmica Gupta 01/12/2015
 *
 * Do some transactions, see if the tar is corrupted.
 * If the transaction is aborted, the TAR should be rolled back to the
 * checkpointed value before the transaction began. The value written to
 * TAR in suspended mode should only remain in TAR if the transaction
 * completes.
 */
 
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
 
#include "tm.h"
#include "utils.h"
 
int	num_loops	= 10000;
 
int test_tar(void)
{
<------>int i;
 
<------>SKIP_IF(!have_htm());
<------>SKIP_IF(!is_ppc64le());
 
<------>for (i = 0; i < num_loops; i++)
<------>{
<------><------>uint64_t result = 0;
<------><------>asm __volatile__(
<------><------><------>"li	7, 1;"
<------><------><------>"mtspr	%[tar], 7;"	/* tar = 1 */
<------><------><------>"tbegin.;"
<------><------><------>"beq	3f;"
<------><------><------>"li	4, 0x7000;"	/* Loop lots, to use time */
<------><------><------>"2:;"			/* Start loop */
<------><------><------>"li	7, 2;"
<------><------><------>"mtspr	%[tar], 7;"	/* tar = 2 */
<------><------><------>"tsuspend.;"
<------><------><------>"li	7, 3;"
<------><------><------>"mtspr	%[tar], 7;"	/* tar = 3 */
<------><------><------>"tresume.;"
<------><------><------>"subi	4, 4, 1;"
<------><------><------>"cmpdi	4, 0;"
<------><------><------>"bne	2b;"
<------><------><------>"tend.;"
 
<------><------><------>/* Transaction sucess! TAR should be 3 */
<------><------><------>"mfspr  7, %[tar];"
<------><------><------>"ori	%[res], 7, 4;"  // res = 3|4 = 7
<------><------><------>"b	4f;"
 
<------><------><------>/* Abort handler. TAR should be rolled back to 1 */
<------><------><------>"3:;"
<------><------><------>"mfspr  7, %[tar];"
<------><------><------>"ori	%[res], 7, 8;"	// res = 1|8 = 9
<------><------><------>"4:;"
 
<------><------><------>: [res]"=r"(result)
<------><------><------>: [tar]"i"(SPRN_TAR)
<------><------><------>   : "memory", "r0", "r4", "r7");
 
<------><------>/* If result is anything else other than 7 or 9, the tar
<------><------> * value must have been corrupted. */
<------><------>if ((result != 7) && (result != 9))
<------><------><------>return 1;
<------>}
<------>return 0;
}
 
int main(int argc, char *argv[])
{
<------>/* A low number of iterations (eg 100) can cause a false pass */
<------>if (argc > 1) {
<------><------>if (strcmp(argv[1], "-h") == 0) {
<------><------><------>printf("Syntax:\n\t%s [<num loops>]\n",
<------><------><------>       argv[0]);
<------><------><------>return 1;
<------><------>} else {
<------><------><------>num_loops = atoi(argv[1]);
<------><------>}
<------>}
 
<------>printf("Starting, %d loops\n", num_loops);
 
<------>return test_harness(test_tar, "tm_tar");
}