// SPDX-License-Identifier: GPL-2.0-only
/*
* POWER Data Stream Control Register ( DSCR ) SPR test
*
* This test modifies the DSCR value through both the SPR number
* based mtspr instruction and then makes sure that the same is
* reflected through mfspr instruction using either of the SPR
* numbers .
*
* When using the privilege state SPR , the instructions such as
* mfspr or mtspr are privileged and the kernel emulates them
* for us . Instructions using problem state SPR can be executed
* directly without any emulation if the HW supports them . Else
* they also get emulated by the kernel .
*
* Copyright 2013 , Anton Blanchard , IBM Corporation .
* Copyright 2015 , Anshuman Khandual , IBM Corporation .
*/
#include "dscr.h"
static int check_dscr(char *str)
{
unsigned long cur_dscr, cur_dscr_usr;
cur_dscr = get_dscr();
cur_dscr_usr = get_dscr_usr();
if (cur_dscr != cur_dscr_usr) {
printf("%s set, kernel get %lx != user get %lx\n" ,
str, cur_dscr, cur_dscr_usr);
return 1 ;
}
return 0 ;
}
int dscr_user(void )
{
int i;
SKIP_IF(!have_hwcap2(PPC_FEATURE2_DSCR));
check_dscr("" );
for (i = 0 ; i < COUNT; i++) {
set_dscr(i);
if (check_dscr("kernel" ))
return 1 ;
}
for (i = 0 ; i < COUNT; i++) {
set_dscr_usr(i);
if (check_dscr("user" ))
return 1 ;
}
return 0 ;
}
int main(int argc, char *argv[])
{
return test_harness(dscr_user, "dscr_user_test" );
}
Messung V0.5 in Prozent C=97 H=82 G=89
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-10-11)
¤
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