From nobody Tue Feb 10 13:16:55 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1645777625437285.8688901712967; Fri, 25 Feb 2022 00:27:05 -0800 (PST) Received: from localhost ([::1]:60382 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nNVwO-0006r2-B5 for importer@patchew.org; Fri, 25 Feb 2022 03:27:04 -0500 Received: from eggs.gnu.org ([209.51.188.92]:47374) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nNVaD-0008BJ-9K for qemu-devel@nongnu.org; Fri, 25 Feb 2022 03:04:12 -0500 Received: from mail.loongson.cn ([114.242.206.163]:42042 helo=loongson.cn) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nNVZt-0002SI-6D for qemu-devel@nongnu.org; Fri, 25 Feb 2022 03:04:08 -0500 Received: from localhost.localdomain (unknown [10.2.5.185]) by mail.loongson.cn (Coremail) with SMTP id AQAAf9DxqMg8jRhiw9UGAA--.8228S7; Fri, 25 Feb 2022 16:03:12 +0800 (CST) From: Xiaojuan Yang To: qemu-devel@nongnu.org Subject: [RFC PATCH v6 05/29] target/loongarch: Add constant timer support Date: Fri, 25 Feb 2022 03:02:44 -0500 Message-Id: <20220225080308.1405-6-yangxiaojuan@loongson.cn> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220225080308.1405-1-yangxiaojuan@loongson.cn> References: <20220225080308.1405-1-yangxiaojuan@loongson.cn> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: AQAAf9DxqMg8jRhiw9UGAA--.8228S7 X-Coremail-Antispam: 1UD129KBjvJXoWxGry8Jw1fZF1DGF4rWw4fuFg_yoWrAF1xpF Z7Cr9xtr40yrZxW3Z7Jas8Xr1DXw4xWF12vayfCF40kwsrXw1xW34ktrZrZF43Za4rWrWI qF95Z3WYgF47JaUanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnUUvcSsGvfC2KfnxnUUI43ZEXa7xR_UUUUUUUUU== X-CM-SenderInfo: p1dqw5xldry3tdq6z05rqj20fqof0/ Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=114.242.206.163; envelope-from=yangxiaojuan@loongson.cn; helo=loongson.cn X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.cave-ayland@ilande.co.uk, richard.henderson@linaro.org, Song Gao Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZM-MESSAGEID: 1645777626537100003 Content-Type: text/plain; charset="utf-8" Signed-off-by: Xiaojuan Yang Signed-off-by: Song Gao --- target/loongarch/constant_timer.c | 62 +++++++++++++++++++++++++++++++ target/loongarch/cpu.h | 10 +++++ target/loongarch/meson.build | 1 + 3 files changed, 73 insertions(+) create mode 100644 target/loongarch/constant_timer.c diff --git a/target/loongarch/constant_timer.c b/target/loongarch/constant_= timer.c new file mode 100644 index 0000000000..8477f91f35 --- /dev/null +++ b/target/loongarch/constant_timer.c @@ -0,0 +1,62 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * QEMU LoongArch constant timer support + * + * Copyright (c) 2021 Loongson Technology Corporation Limited + */ + +#include "qemu/osdep.h" +#include "hw/loongarch/loongarch.h" +#include "qemu/timer.h" +#include "cpu.h" + +#define TIMER_PERIOD 10 /* 10 ns period for 100 MHz frequen= cy */ +#define CONSTANT_TIMER_TICK_MASK 0xfffffffffffcUL +#define CONSTANT_TIMER_ENABLE 0x1UL + +uint64_t cpu_loongarch_get_constant_timer_counter(LoongArchCPU *cpu) +{ + return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / TIMER_PERIOD; +} + +uint64_t cpu_loongarch_get_constant_timer_ticks(LoongArchCPU *cpu) +{ + uint64_t now, expire; + + now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + expire =3D timer_expire_time_ns(&cpu->timer); + + return (expire - now) / TIMER_PERIOD; +} + +void cpu_loongarch_store_constant_timer_config(LoongArchCPU *cpu, + uint64_t value) +{ + CPULoongArchState *env =3D &cpu->env; + uint64_t now, next; + + env->CSR_TCFG =3D value; + if (value & CONSTANT_TIMER_ENABLE) { + now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + next =3D now + (value & CONSTANT_TIMER_TICK_MASK) * TIMER_PERIOD; + timer_mod(&cpu->timer, next); + } +} + +void loongarch_constant_timer_cb(void *opaque) +{ + LoongArchCPU *cpu =3D opaque; + CPULoongArchState *env =3D &cpu->env; + uint64_t now, next; + + if (FIELD_EX64(env->CSR_TCFG, CSR_TCFG, PERIODIC)) { + now =3D qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + next =3D now + (env->CSR_TCFG & CONSTANT_TIMER_TICK_MASK) * TIMER_= PERIOD; + timer_mod(&cpu->timer, next); + } else { + env->CSR_TCFG =3D FIELD_DP64(env->CSR_TCFG, CSR_TCFG, EN, 0); + } + + env->CSR_ESTAT |=3D 1 << IRQ_TIMER; + cpu_interrupt(CPU(cpu), CPU_INTERRUPT_HARD); +} diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index 80b03f7bd7..95955bd8df 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -12,6 +12,7 @@ #include "fpu/softfloat-types.h" #include "hw/registerfields.h" #include "cpu-csr.h" +#include "qemu/timer.h" =20 #define TCG_GUEST_DEFAULT_MO (0) =20 @@ -148,6 +149,9 @@ FIELD(CPUCFG20, L3IU_SIZE, 24, 7) extern const char * const regnames[32]; extern const char * const fregnames[32]; =20 +#define N_IRQS 14 +#define IRQ_TIMER 11 + typedef struct CPULoongArchState CPULoongArchState; struct CPULoongArchState { uint64_t gpr[32]; @@ -237,6 +241,7 @@ struct LoongArchCPU { =20 CPUNegativeOffsetState neg; CPULoongArchState env; + QEMUTimer timer; }; =20 #define TYPE_LOONGARCH_CPU "loongarch-cpu" @@ -301,4 +306,9 @@ enum { #define LOONGARCH_CPU_TYPE_NAME(model) model LOONGARCH_CPU_TYPE_SUFFIX #define CPU_RESOLVING_TYPE TYPE_LOONGARCH_CPU =20 +void loongarch_constant_timer_cb(void *opaque); +uint64_t cpu_loongarch_get_constant_timer_counter(LoongArchCPU *cpu); +uint64_t cpu_loongarch_get_constant_timer_ticks(LoongArchCPU *cpu); +void cpu_loongarch_store_constant_timer_config(LoongArchCPU *cpu, + uint64_t value); #endif /* LOONGARCH_CPU_H */ diff --git a/target/loongarch/meson.build b/target/loongarch/meson.build index 103f36ee15..6168e910a0 100644 --- a/target/loongarch/meson.build +++ b/target/loongarch/meson.build @@ -17,6 +17,7 @@ loongarch_tcg_ss.add(zlib) loongarch_softmmu_ss =3D ss.source_set() loongarch_softmmu_ss.add(files( 'machine.c', + 'constant_timer.c', )) =20 loongarch_ss.add_all(when: 'CONFIG_TCG', if_true: [loongarch_tcg_ss]) --=20 2.27.0