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-rw-r--r--tools/testing/selftests/powerpc/dexcr/dexcr.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/dexcr/dexcr.c b/tools/testing/selftests/powerpc/dexcr/dexcr.c
index 65ec5347de..468fd0dc99 100644
--- a/tools/testing/selftests/powerpc/dexcr/dexcr.c
+++ b/tools/testing/selftests/powerpc/dexcr/dexcr.c
@@ -3,6 +3,7 @@
#include <errno.h>
#include <setjmp.h>
#include <signal.h>
+#include <sys/prctl.h>
#include <sys/types.h>
#include <sys/wait.h>
@@ -43,6 +44,45 @@ out:
return exists;
}
+unsigned int pr_which_to_aspect(unsigned long which)
+{
+ switch (which) {
+ case PR_PPC_DEXCR_SBHE:
+ return DEXCR_PR_SBHE;
+ case PR_PPC_DEXCR_IBRTPD:
+ return DEXCR_PR_IBRTPD;
+ case PR_PPC_DEXCR_SRAPD:
+ return DEXCR_PR_SRAPD;
+ case PR_PPC_DEXCR_NPHIE:
+ return DEXCR_PR_NPHIE;
+ default:
+ FAIL_IF_EXIT_MSG(true, "unknown PR aspect");
+ }
+}
+
+int pr_get_dexcr(unsigned long which)
+{
+ return prctl(PR_PPC_GET_DEXCR, which, 0UL, 0UL, 0UL);
+}
+
+int pr_set_dexcr(unsigned long which, unsigned long ctrl)
+{
+ return prctl(PR_PPC_SET_DEXCR, which, ctrl, 0UL, 0UL);
+}
+
+bool pr_dexcr_aspect_supported(unsigned long which)
+{
+ if (pr_get_dexcr(which) == -1)
+ return errno == ENODEV;
+
+ return true;
+}
+
+bool pr_dexcr_aspect_editable(unsigned long which)
+{
+ return pr_get_dexcr(which) & PR_PPC_DEXCR_CTRL_EDITABLE;
+}
+
/*
* Just test if a bad hashchk triggers a signal, without checking
* for support or if the NPHIE aspect is enabled.