mirror of https://github.com/xemu-project/xemu.git
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
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/*
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* RISC-V Vector Extension Helpers for QEMU.
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*
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* Copyright (c) 2020 T-Head Semiconductor Co., Ltd. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "qemu/osdep.h"
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#include "cpu.h"
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#include "exec/exec-all.h"
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#include "exec/helper-proto.h"
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#include <math.h>
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target_ulong HELPER(vsetvl)(CPURISCVState *env, target_ulong s1,
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target_ulong s2)
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{
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int vlmax, vl;
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RISCVCPU *cpu = env_archcpu(env);
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uint16_t sew = 8 << FIELD_EX64(s2, VTYPE, VSEW);
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uint8_t ediv = FIELD_EX64(s2, VTYPE, VEDIV);
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bool vill = FIELD_EX64(s2, VTYPE, VILL);
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target_ulong reserved = FIELD_EX64(s2, VTYPE, RESERVED);
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if ((sew > cpu->cfg.elen) || vill || (ediv != 0) || (reserved != 0)) {
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/* only set vill bit. */
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env->vtype = FIELD_DP64(0, VTYPE, VILL, 1);
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env->vl = 0;
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env->vstart = 0;
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return 0;
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}
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vlmax = vext_get_vlmax(cpu, s2);
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if (s1 <= vlmax) {
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vl = s1;
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} else {
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vl = vlmax;
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}
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env->vl = vl;
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env->vtype = s2;
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env->vstart = 0;
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return vl;
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}
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