62 lines
1.5 KiB
C
62 lines
1.5 KiB
C
|
/*
|
||
|
|
* 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 priviledged and the kernel emulates them
|
||
|
|
* for us. Instructions using problem state SPR can be exuecuted
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify it
|
||
|
|
* under the terms of the GNU General Public License version 2 as published
|
||
|
|
* by the Free Software Foundation.
|
||
|
|
*/
|
||
|
|
#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;
|
||
|
|
|
||
|
|
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");
|
||
|
|
}
|