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target/arm: Implement SMSTART, SMSTOP

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These two instructions are aliases of MSR (immediate).
Use the two helpers to properly implement svcr_write.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220620175235.60881-11-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-06-20 10:51:54 -07:00 • committed by Peter Maydell
parent dc993a01a7
commit f84734b874
7 changed files with 112 additions and 3 deletions
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61
target/arm/sme_helper.c Normal file
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/*
* ARM SME Operations
*
* Copyright (c) 2022 Linaro, Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "cpu.h"
#include "internals.h"
#include "exec/helper-proto.h"
/* ResetSVEState */
void arm_reset_sve_state(CPUARMState *env)
{
memset(env->vfp.zregs, 0, sizeof(env->vfp.zregs));
/* Recall that FFR is stored as pregs[16]. */
memset(env->vfp.pregs, 0, sizeof(env->vfp.pregs));
vfp_set_fpcr(env, 0x0800009f);
}
void helper_set_pstate_sm(CPUARMState *env, uint32_t i)
{
if (i == FIELD_EX64(env->svcr, SVCR, SM)) {
return;
}
env->svcr ^= R_SVCR_SM_MASK;
arm_reset_sve_state(env);
}
void helper_set_pstate_za(CPUARMState *env, uint32_t i)
{
if (i == FIELD_EX64(env->svcr, SVCR, ZA)) {
return;
}
env->svcr ^= R_SVCR_ZA_MASK;
/*
* ResetSMEState.
*
* SetPSTATE_ZA zeros on enable and disable. We can zero this only
* on enable: while disabled, the storage is inaccessible and the
* value does not matter. We're not saving the storage in vmstate
* when disabled either.
*/
if (i) {
memset(env->zarray, 0, sizeof(env->zarray));
}
}