模擬器 - QEMU - Allwinner F1C100S - 移植教學 - 添加CPU

參考資訊：
https://gitlab.com/qemu-project/qemu

QEMU v8.0.0

$ cd
$ git clone https://gitlab.com/qemu-project/qemu -b v8.0.0 --depth=1

configs/devices/arm-softmmu/default.mak

CONFIG_F1C100S=y

target/arm/cpu_tcg.c

static void f1c100s_initfn(Object *obj)
{
    ARMCPU *cpu = ARM_CPU(obj);

    cpu->dtb_compatible = "arm,arm926";
    set_feature(&cpu->env, ARM_FEATURE_V5);
    set_feature(&cpu->env, ARM_FEATURE_DUMMY_C15_REGS);
    set_feature(&cpu->env, ARM_FEATURE_CACHE_TEST_CLEAN);
    cpu->midr = 0x41069265;
    cpu->reset_fpsid = 0x41011090;
    cpu->ctr = 0x1dd20d2;
    cpu->reset_sctlr = 0x00090078;
}

static const ARMCPUInfo arm_tcg_cpus[] = {
    ...
    { .name = "f1c100s", .initfn = f1c100s_initfn },
};

hw/arm/f1c100s.c

#include "qemu/osdep.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/datadir.h"
#include "qemu/units.h"
#include "qemu/f1c100s_log.h"
#include "hw/sysbus.h"
#include "hw/arm/boot.h"
#include "hw/ssi/ssi.h"
#include "hw/misc/unimp.h"
#include "hw/boards.h"
#include "hw/usb/hcd-ohci.h"
#include "hw/loader.h"
#include "hw/firmware/smbios.h"
#include "qapi/error.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "target/arm/cpu.h"

#define TYPE_F1C100S "f1c100s"
OBJECT_DECLARE_SIMPLE_TYPE(f1c100s_soc_state, F1C100S)

int f1c100s_debug_level = TRACE_LEVEL;

struct f1c100s_soc_state {
};
 
static void f1c100s_soc_realize(DeviceState *dev, Error **errp)
{
    trace("call %s()\n", __func__);
}
 
static void f1c100s_soc_instance_init(Object *obj)
{
    trace("call %s()\n", __func__);
}
 
static void f1c100s_soc_class_init(ObjectClass *oc, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(oc);
 
    trace("call %s()\n", __func__);
    dc->realize = f1c100s_soc_realize;
}
 
static const TypeInfo f1c100s_soc_type_info = {
    .name = "f1c100s",
    .parent = TYPE_DEVICE,
    .instance_size = sizeof(f1c100s_soc_state),
    .instance_init = f1c100s_soc_instance_init,
    .class_init = f1c100s_soc_class_init,
};
 
static void f1c100s_soc_register_types(void)
{
    trace("call %s()\n", __func__);
    type_register_static(&f1c100s_soc_type_info);
}
 
type_init(f1c100s_soc_register_types)
 
static void f1c100s_soc_board_init(MachineState *machine)
{
    trace("call %s()\n", __func__);
};
 
static void f1c100s_soc_init(MachineClass *mc)
{
    trace("call %s()\n", __func__);
 
    mc->desc = "Allwinner F1C100S (ARM926EJ-S)";
    mc->init = f1c100s_soc_board_init;
    mc->min_cpus = 1;
    mc->max_cpus = 1;
    mc->default_cpus = 1;
    mc->default_cpu_type = ARM_CPU_TYPE_NAME("f1c100s");
    mc->default_ram_size = 32 * MiB;
    mc->default_ram_id = "f1c100s.ram";
};
 
DEFINE_MACHINE("f1c100s", f1c100s_soc_init)

hw/arm/meson.build

arm_ss.add(when: 'CONFIG_F1C100S', if_true: files('f1c100s.c'))

hw/arm/Kconfig

config F1C100S
    bool

include/qemu/aw_log.h

#ifndef __AW_LOG_H__
#define __AW_LOG_H__

extern int f1c100s_debug_level;

#define trace(...) do {                         \
    if (f1c100s_debug_level >= TRACE_LEVEL) {       \
        printf("[TRACE] ");                     \
        printf(__VA_ARGS__);                    \
    }                                           \
} while(0);

#define debug(...) do {                         \
    if (f1c100s_debug_level >= DEBUG_LEVEL) {       \
        printf("[DEBUG] ");                     \
        printf(__VA_ARGS__);                    \
    }                                           \
} while(0);

#define error(...) do {                         \
    if (f1c100s_debug_level >= ERROR_LEVEL) {       \
        printf("[ERROR] ");                     \
        printf(__VA_ARGS__);                    \
    }                                           \
} while(0);

#define fatal(...) do {                         \
    printf("[FATAL] ");                         \
    printf(__VA_ARGS__);                        \
    exit(-1);                                   \
} while(0);

#endif

編譯、測試

$ ./configure --target-list=arm-softmmu
$ make -j4
$ sudo make install

$ ./build/qemu-system-arm -cpu help
    Available CPUs:
      f1c100s

$ ./build/qemu-system-arm -M help
    f1c100s Allwinner F1C100S (ARM926EJ-S)

$ ./build/qemu-system-arm -M f1c100s
    [TRACE] call f1c100s_soc_register_types()
    [TRACE] call f1c100s_soc_init()
    [TRACE] call f1c100s_soc_class_init()
    [TRACE] call f1c100s_soc_board_init()