diff options
| -rw-r--r-- | target/loongarch/constant_timer.c | 64 | ||||
| -rw-r--r-- | target/loongarch/cpu.c | 2 | ||||
| -rw-r--r-- | target/loongarch/cpu.h | 4 | ||||
| -rw-r--r-- | target/loongarch/internals.h | 6 | ||||
| -rw-r--r-- | target/loongarch/meson.build | 1 |
5 files changed, 77 insertions, 0 deletions
diff --git a/target/loongarch/constant_timer.c b/target/loongarch/constant_timer.c new file mode 100644 index 0000000000..1851f53fd6 --- /dev/null +++ b/target/loongarch/constant_timer.c @@ -0,0 +1,64 @@ +/* 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 "qemu/timer.h" +#include "cpu.h" +#include "internals.h" +#include "cpu-csr.h" + +#define TIMER_PERIOD 10 /* 10 ns period for 100 MHz frequency */ +#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 = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + expire = 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 = &cpu->env; + uint64_t now, next; + + env->CSR_TCFG = value; + if (value & CONSTANT_TIMER_ENABLE) { + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + next = now + (value & CONSTANT_TIMER_TICK_MASK) * TIMER_PERIOD; + timer_mod(&cpu->timer, next); + } else { + timer_del(&cpu->timer); + } +} + +void loongarch_constant_timer_cb(void *opaque) +{ + LoongArchCPU *cpu = opaque; + CPULoongArchState *env = &cpu->env; + uint64_t now, next; + + if (FIELD_EX64(env->CSR_TCFG, CSR_TCFG, PERIODIC)) { + now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + next = now + (env->CSR_TCFG & CONSTANT_TIMER_TICK_MASK) * TIMER_PERIOD; + timer_mod(&cpu->timer, next); + } else { + env->CSR_TCFG = FIELD_DP64(env->CSR_TCFG, CSR_TCFG, EN, 0); + } + + loongarch_cpu_set_irq(opaque, IRQ_TIMER, 1); +} diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c index 01a0b4878a..5ec0ba1cfa 100644 --- a/target/loongarch/cpu.c +++ b/target/loongarch/cpu.c @@ -495,6 +495,8 @@ static void loongarch_cpu_init(Object *obj) cpu_set_cpustate_pointers(cpu); qdev_init_gpio_in(DEVICE(cpu), loongarch_cpu_set_irq, N_IRQS); + timer_init_ns(&cpu->timer, QEMU_CLOCK_VIRTUAL, + &loongarch_constant_timer_cb, cpu); } static ObjectClass *loongarch_cpu_class_by_name(const char *cpu_model) diff --git a/target/loongarch/cpu.h b/target/loongarch/cpu.h index b983ce241c..2081902f2e 100644 --- a/target/loongarch/cpu.h +++ b/target/loongarch/cpu.h @@ -11,6 +11,7 @@ #include "exec/cpu-defs.h" #include "fpu/softfloat-types.h" #include "hw/registerfields.h" +#include "qemu/timer.h" #define TCG_GUEST_DEFAULT_MO (0) @@ -185,6 +186,8 @@ extern const char * const regnames[32]; extern const char * const fregnames[32]; #define N_IRQS 13 +#define IRQ_TIMER 11 +#define IRQ_IPI 12 #define LOONGARCH_STLB 2048 /* 2048 STLB */ #define LOONGARCH_MTLB 64 /* 64 MTLB */ @@ -295,6 +298,7 @@ struct ArchCPU { CPUNegativeOffsetState neg; CPULoongArchState env; + QEMUTimer timer; }; #define TYPE_LOONGARCH_CPU "loongarch-cpu" diff --git a/target/loongarch/internals.h b/target/loongarch/internals.h index 69183e8bb5..4b1bcd7c0f 100644 --- a/target/loongarch/internals.h +++ b/target/loongarch/internals.h @@ -32,6 +32,12 @@ extern const VMStateDescription vmstate_loongarch_cpu; void loongarch_cpu_set_irq(void *opaque, int irq, int level); +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); + bool loongarch_cpu_tlb_fill(CPUState *cs, vaddr address, int size, MMUAccessType access_type, int mmu_idx, bool probe, uintptr_t retaddr); diff --git a/target/loongarch/meson.build b/target/loongarch/meson.build index 435cc75999..04e15ba1e3 100644 --- a/target/loongarch/meson.build +++ b/target/loongarch/meson.build @@ -18,6 +18,7 @@ loongarch_softmmu_ss = ss.source_set() loongarch_softmmu_ss.add(files( 'machine.c', 'tlb_helper.c', + 'constant_timer.c', )) loongarch_ss.add_all(when: 'CONFIG_TCG', if_true: [loongarch_tcg_ss]) |