fix(mpam): refine MPAM initialization and enablement process
Restricts MPAM to only NS world and enables trap to EL3 for access of
MPAM registers from lower ELs of Secure and Realm world.
This patch removes MPAM enablement from global context and adds it to
EL3 State context which enables/disables MPAM during world switches.
Renamed ENABLE_MPAM_FOR_LOWER_ELS to ENABLE_FEAT_MPAM and
removed mpam_init_el3() as RESET behaviour is trapping.
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I131f9dba5df236a71959b2d425ee11af7f3c38c4
diff --git a/lib/extensions/mpam/mpam.c b/lib/extensions/mpam/mpam.c
index 6462c97..875ad9c 100644
--- a/lib/extensions/mpam/mpam.c
+++ b/lib/extensions/mpam/mpam.c
@@ -11,14 +11,19 @@
#include <arch_helpers.h>
#include <lib/extensions/mpam.h>
-void mpam_init_el3(void)
+void mpam_enable(cpu_context_t *context)
{
+ u_register_t mpam3_el3;
+
+ mpam3_el3 = read_ctx_reg(get_el3state_ctx(context), CTX_MPAM3_EL3);
+
/*
* Enable MPAM, and disable trapping to EL3 when lower ELs access their
- * own MPAM registers.
+ * own MPAM registers
*/
- write_mpam3_el3(MPAM3_EL3_MPAMEN_BIT);
-
+ mpam3_el3 = (mpam3_el3 | MPAM3_EL3_MPAMEN_BIT) &
+ ~(MPAM3_EL3_TRAPLOWER_BIT);
+ write_ctx_reg(get_el3state_ctx(context), CTX_MPAM3_EL3, mpam3_el3);
}
/*