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target/loongarch: Add LoongArch CSR instruction

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This includes:
- CSRRD
- CSRWR
- CSRXCHG

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-26-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Xiaojuan Yang 2022-06-06 20:43:15 +08:00 • committed by Richard Henderson
parent dd615fa48d
commit 5b1dedfe84
7 changed files with 484 additions and 1 deletions
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87
target/loongarch/csr_helper.c Normal file
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/* 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;
}