Archipelago » qemu

/*

 *  QEMU model of the LatticeMico32 system control block.

 *

 *  Copyright (c) 2010 Michael Walle <michael@walle.cc>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, see <http://www.gnu.org/licenses/>.

 */

/*

 * This model is mainly intended for testing purposes and doesn't fit to any

 * real hardware. On the one hand it provides a control register (R_CTRL) on

 * the other hand it supports the lm32 tests.

 *

 * A write to the control register causes a system shutdown.

 * Tests first write the pointer to a test name to the test name register

 * (R_TESTNAME) and then write a zero to the pass/fail register (R_PASSFAIL) if

 * the test is passed or any non-zero value to it if the test is failed.

 */

#include "hw/hw.h"

#include "hw/sysbus.h"

#include "trace.h"

#include "qemu/log.h"

#include "qemu/error-report.h"

#include "sysemu/sysemu.h"

enum {

    R_CTRL = 0,

    R_PASSFAIL,

    R_TESTNAME,

    R_MAX

};

#define MAX_TESTNAME_LEN 16

struct LM32SysState {

    SysBusDevice busdev;

    MemoryRegion iomem;

    uint32_t base;

    uint32_t regs[R_MAX];

    uint8_t testname[MAX_TESTNAME_LEN];

};

typedef struct LM32SysState LM32SysState;

static void copy_testname(LM32SysState *s)

{

    cpu_physical_memory_read(s->regs[R_TESTNAME], s->testname,

            MAX_TESTNAME_LEN);

    s->testname[MAX_TESTNAME_LEN - 1] = '\0';

}

static void sys_write(void *opaque, hwaddr addr,

                      uint64_t value, unsigned size)

{

    LM32SysState *s = opaque;

    char *testname;

    trace_lm32_sys_memory_write(addr, value);

    addr >>= 2;

    switch (addr) {

    case R_CTRL:

        qemu_system_shutdown_request();

        break;

    case R_PASSFAIL:

        s->regs[addr] = value;

        testname = (char *)s->testname;

        qemu_log("TC  %-16s %s\n", testname, (value) ? "FAILED" : "OK");

        break;

    case R_TESTNAME:

        s->regs[addr] = value;

        copy_testname(s);

        break;

    default:

        error_report("lm32_sys: write access to unknown register 0x"

                TARGET_FMT_plx, addr << 2);

        break;

    }

}

static bool sys_ops_accepts(void *opaque, hwaddr addr,

                            unsigned size, bool is_write)

{

    return is_write && size == 4;

}

static const MemoryRegionOps sys_ops = {

    .write = sys_write,

    .valid.accepts = sys_ops_accepts,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static void sys_reset(DeviceState *d)

{

    LM32SysState *s = container_of(d, LM32SysState, busdev.qdev);

    int i;

    for (i = 0; i < R_MAX; i++) {

        s->regs[i] = 0;

    }

    memset(s->testname, 0, MAX_TESTNAME_LEN);

}

static int lm32_sys_init(SysBusDevice *dev)

{

    LM32SysState *s = FROM_SYSBUS(typeof(*s), dev);

    memory_region_init_io(&s->iomem, &sys_ops , s, "sys", R_MAX * 4);

    sysbus_init_mmio(dev, &s->iomem);

    /* Note: This device is not created in the board initialization,

     * instead it has to be added with the -device parameter. Therefore,

     * the device maps itself. */

    sysbus_mmio_map(dev, 0, s->base);

    return 0;

}

static const VMStateDescription vmstate_lm32_sys = {

    .name = "lm32-sys",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields      = (VMStateField[]) {

        VMSTATE_UINT32_ARRAY(regs, LM32SysState, R_MAX),

        VMSTATE_BUFFER(testname, LM32SysState),

        VMSTATE_END_OF_LIST()

    }

};

static Property lm32_sys_properties[] = {

    DEFINE_PROP_UINT32("base", LM32SysState, base, 0xffff0000),

    DEFINE_PROP_END_OF_LIST(),

};

static void lm32_sys_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = lm32_sys_init;

    dc->reset = sys_reset;

    dc->vmsd = &vmstate_lm32_sys;

    dc->props = lm32_sys_properties;

}

static const TypeInfo lm32_sys_info = {

    .name          = "lm32-sys",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(LM32SysState),

    .class_init    = lm32_sys_class_init,

};

static void lm32_sys_register_types(void)

{

    type_register_static(&lm32_sys_info);

}

type_init(lm32_sys_register_types)