From 5b1dedfe848b61521aa5b46b81a4cc676e9e7c1b Mon Sep 17 00:00:00 2001 From: Xiaojuan Yang Date: Mon, 6 Jun 2022 20:43:15 +0800 Subject: target/loongarch: Add LoongArch CSR instruction This includes: - CSRRD - CSRWR - CSRXCHG Signed-off-by: Xiaojuan Yang Signed-off-by: Song Gao Reviewed-by: Richard Henderson Message-Id: <20220606124333.2060567-26-yangxiaojuan@loongson.cn> Signed-off-by: Richard Henderson --- target/loongarch/csr_helper.c | 87 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 target/loongarch/csr_helper.c (limited to 'target/loongarch/csr_helper.c') diff --git a/target/loongarch/csr_helper.c b/target/loongarch/csr_helper.c new file mode 100644 index 0000000000..24a9389364 --- /dev/null +++ b/target/loongarch/csr_helper.c @@ -0,0 +1,87 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * LoongArch emulation helpers for CSRs + * + * Copyright (c) 2021 Loongson Technology Corporation Limited + */ + +#include "qemu/osdep.h" +#include "qemu/main-loop.h" +#include "cpu.h" +#include "internals.h" +#include "qemu/host-utils.h" +#include "exec/helper-proto.h" +#include "exec/exec-all.h" +#include "exec/cpu_ldst.h" +#include "hw/irq.h" +#include "cpu-csr.h" +#include "tcg/tcg-ldst.h" + +target_ulong helper_csrrd_pgd(CPULoongArchState *env) +{ + int64_t v; + + if (env->CSR_TLBRERA & 0x1) { + v = env->CSR_TLBRBADV; + } else { + v = env->CSR_BADV; + } + + if ((v >> 63) & 0x1) { + v = env->CSR_PGDH; + } else { + v = env->CSR_PGDL; + } + + return v; +} + +target_ulong helper_csrrd_tval(CPULoongArchState *env) +{ + LoongArchCPU *cpu = env_archcpu(env); + + return cpu_loongarch_get_constant_timer_ticks(cpu); +} + +target_ulong helper_csrwr_estat(CPULoongArchState *env, target_ulong val) +{ + int64_t old_v = env->CSR_ESTAT; + + /* Only IS[1:0] can be written */ + env->CSR_ESTAT = deposit64(env->CSR_ESTAT, 0, 2, val); + + return old_v; +} + +target_ulong helper_csrwr_asid(CPULoongArchState *env, target_ulong val) +{ + int64_t old_v = env->CSR_ASID; + + /* Only ASID filed of CSR_ASID can be written */ + env->CSR_ASID = deposit64(env->CSR_ASID, 0, 10, val); + if (old_v != env->CSR_ASID) { + tlb_flush(env_cpu(env)); + } + return old_v; +} + +target_ulong helper_csrwr_tcfg(CPULoongArchState *env, target_ulong val) +{ + LoongArchCPU *cpu = env_archcpu(env); + int64_t old_v = env->CSR_TCFG; + + cpu_loongarch_store_constant_timer_config(cpu, val); + + return old_v; +} + +target_ulong helper_csrwr_ticlr(CPULoongArchState *env, target_ulong val) +{ + LoongArchCPU *cpu = env_archcpu(env); + int64_t old_v = 0; + + if (val & 0x1) { + loongarch_cpu_set_irq(cpu, IRQ_TIMER, 0); + } + return old_v; +} -- cgit v1.2.3