blob: 2c25a9db777031708c18070b5876bd9a29350737 [file] [log] [blame]
/*
* Copyright (c) 2017-2023, Arm Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <stdbool.h>
#include <arch.h>
#include <arch_features.h>
#include <arch_helpers.h>
#include <lib/el3_runtime/pubsub.h>
#include <lib/extensions/spe.h>
static inline void psb_csync(void)
{
/*
* The assembler does not yet understand the psb csync mnemonic
* so use the equivalent hint instruction.
*/
__asm__ volatile("hint #17");
}
void spe_init_el3(void)
{
uint64_t v;
/*
* MDCR_EL3.NSPB (ARM v8.2): SPE enabled in Non-secure state
* and disabled in secure state. Accesses to SPE registers at
* S-EL1 generate trap exceptions to EL3.
*
* MDCR_EL3.NSPBE: Profiling Buffer uses Non-secure Virtual Addresses.
* When FEAT_RME is not implemented, this field is RES0.
*
* MDCR_EL3.EnPMSN (ARM v8.7): Do not trap access to PMSNEVFR_EL1
* register at NS-EL1 or NS-EL2 to EL3 if FEAT_SPEv1p2 is implemented.
* Setting this bit to 1 doesn't have any effect on it when
* FEAT_SPEv1p2 not implemented.
*/
v = read_mdcr_el3();
v |= MDCR_NSPB(MDCR_NSPB_EL1) | MDCR_EnPMSN_BIT;
v &= ~(MDCR_NSPBE_BIT);
write_mdcr_el3(v);
}
void spe_init_el2_unused(void)
{
uint64_t v;
/*
* MDCR_EL2.TPMS (ARM v8.2): Do not trap statistical
* profiling controls to EL2.
*
* MDCR_EL2.E2PB (ARM v8.2): SPE enabled in Non-secure
* state. Accesses to profiling buffer controls at
* Non-secure EL1 are not trapped to EL2.
*/
v = read_mdcr_el2();
v &= ~MDCR_EL2_TPMS;
v |= MDCR_EL2_E2PB(MDCR_EL2_E2PB_EL1);
write_mdcr_el2(v);
}
void spe_disable(void)
{
uint64_t v;
/* Drain buffered data */
psb_csync();
dsbnsh();
/* Disable profiling buffer */
v = read_pmblimitr_el1();
v &= ~(1ULL << 0);
write_pmblimitr_el1(v);
isb();
}
static void *spe_drain_buffers_hook(const void *arg)
{
if (!is_feat_spe_supported())
return (void *)-1;
/* Drain buffered data */
psb_csync();
dsbnsh();
return (void *)0;
}
SUBSCRIBE_TO_EVENT(cm_entering_secure_world, spe_drain_buffers_hook);