Archipelago » qemu

/*

 * QEMU PowerPC MPC8544DS board emulation

 *

 * Copyright (C) 2009 Freescale Semiconductor, Inc. All rights reserved.

 *

 * Author: Yu Liu,     <yu.liu@freescale.com>

 *

 * This file is derived from hw/ppc440_bamboo.c,

 * the copyright for that material belongs to the original owners.

 *

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

 * it under the terms of  the GNU General  Public License as published by

 * the Free Software Foundation;  either version 2 of the  License, or

 * (at your option) any later version.

 */

#include "config.h"

#include "qemu-common.h"

#include "net.h"

#include "hw.h"

#include "pc.h"

#include "pci.h"

#include "boards.h"

#include "sysemu.h"

#include "kvm.h"

#include "kvm_ppc.h"

#include "device_tree.h"

#include "openpic.h"

#include "ppc.h"

#include "loader.h"

#include "elf.h"

#include "sysbus.h"

#include "exec-memory.h"

#include "host-utils.h"

#define BINARY_DEVICE_TREE_FILE    "mpc8544ds.dtb"

#define UIMAGE_LOAD_BASE           0

#define DTC_LOAD_PAD               0x500000

#define DTC_PAD_MASK               0xFFFFF

#define INITRD_LOAD_PAD            0x2000000

#define INITRD_PAD_MASK            0xFFFFFF

#define RAM_SIZES_ALIGN            (64UL << 20)

#define MPC8544_CCSRBAR_BASE       0xE0000000ULL

#define MPC8544_CCSRBAR_SIZE       0x00100000ULL

#define MPC8544_MPIC_REGS_BASE     (MPC8544_CCSRBAR_BASE + 0x40000ULL)

#define MPC8544_SERIAL0_REGS_BASE  (MPC8544_CCSRBAR_BASE + 0x4500ULL)

#define MPC8544_SERIAL1_REGS_BASE  (MPC8544_CCSRBAR_BASE + 0x4600ULL)

#define MPC8544_PCI_REGS_BASE      (MPC8544_CCSRBAR_BASE + 0x8000ULL)

#define MPC8544_PCI_REGS_SIZE      0x1000ULL

#define MPC8544_PCI_IO             0xE1000000ULL

#define MPC8544_PCI_IOLEN          0x10000ULL

#define MPC8544_UTIL_BASE          (MPC8544_CCSRBAR_BASE + 0xe0000ULL)

#define MPC8544_SPIN_BASE          0xEF000000ULL

struct boot_info

{

    uint32_t dt_base;

    uint32_t dt_size;

    uint32_t entry;

};

static void pci_map_create(void *fdt, uint32_t *pci_map, uint32_t mpic)

{

    int i;

    const uint32_t tmp[] = {

                             /* IDSEL 0x11 J17 Slot 1 */

                             0x8800, 0x0, 0x0, 0x1, mpic, 0x2, 0x1, 0x0, 0x0,

                             0x8800, 0x0, 0x0, 0x2, mpic, 0x3, 0x1, 0x0, 0x0,

                             0x8800, 0x0, 0x0, 0x3, mpic, 0x4, 0x1, 0x0, 0x0,

                             0x8800, 0x0, 0x0, 0x4, mpic, 0x1, 0x1, 0x0, 0x0,

                             /* IDSEL 0x12 J16 Slot 2 */

                             0x9000, 0x0, 0x0, 0x1, mpic, 0x3, 0x1, 0x0, 0x0,

                             0x9000, 0x0, 0x0, 0x2, mpic, 0x4, 0x1, 0x0, 0x0,

                             0x9000, 0x0, 0x0, 0x3, mpic, 0x2, 0x1, 0x0, 0x0,

                             0x9000, 0x0, 0x0, 0x4, mpic, 0x1, 0x1, 0x0, 0x0,

                           };

    for (i = 0; i < ARRAY_SIZE(tmp); i++) {

        pci_map[i] = cpu_to_be32(tmp[i]);

    }

}

static void dt_serial_create(void *fdt, unsigned long long offset,

                             const char *soc, const char *mpic,

                             const char *alias, int idx, bool defcon)

{

    char ser[128];

    snprintf(ser, sizeof(ser), "%s/serial@%llx", soc, offset);

    qemu_devtree_add_subnode(fdt, ser);

    qemu_devtree_setprop_string(fdt, ser, "device_type", "serial");

    qemu_devtree_setprop_string(fdt, ser, "compatible", "ns16550");

    qemu_devtree_setprop_cells(fdt, ser, "reg", offset, 0x100);

    qemu_devtree_setprop_cell(fdt, ser, "cell-index", idx);

    qemu_devtree_setprop_cell(fdt, ser, "clock-frequency", 0);

    qemu_devtree_setprop_cells(fdt, ser, "interrupts", 42, 2, 0, 0);

    qemu_devtree_setprop_phandle(fdt, ser, "interrupt-parent", mpic);

    qemu_devtree_setprop_string(fdt, "/aliases", alias, ser);

    if (defcon) {

        qemu_devtree_setprop_string(fdt, "/chosen", "linux,stdout-path", ser);

    }

}

static int mpc8544_load_device_tree(CPUPPCState *env,

                                    target_phys_addr_t addr,

                                    target_phys_addr_t ramsize,

                                    target_phys_addr_t initrd_base,

                                    target_phys_addr_t initrd_size,

                                    const char *kernel_cmdline)

{

    int ret = -1;

    uint64_t mem_reg_property[] = { 0, cpu_to_be64(ramsize) };

    int fdt_size;

    void *fdt;

    uint8_t hypercall[16];

    uint32_t clock_freq = 400000000;

    uint32_t tb_freq = 400000000;

    int i;

    const char *compatible = "MPC8544DS\0MPC85xxDS";

    int compatible_len = sizeof("MPC8544DS\0MPC85xxDS");

    char compatible_sb[] = "fsl,mpc8544-immr\0simple-bus";

    char model[] = "MPC8544DS";

    char soc[128];

    char mpic[128];

    uint32_t mpic_ph;

    char gutil[128];

    char pci[128];

    uint32_t pci_map[9 * 8];

    uint32_t pci_ranges[14] =

        {

            0x2000000, 0x0, 0xc0000000,

            0x0, 0xc0000000,

            0x0, 0x20000000,

            0x1000000, 0x0, 0x0,

            0x0, 0xe1000000,

            0x0, 0x10000,

        };

    QemuOpts *machine_opts;

    const char *dumpdtb = NULL;

    const char *dtb_file = NULL;

    machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);

    if (machine_opts) {

        const char *tmp;

        dumpdtb = qemu_opt_get(machine_opts, "dumpdtb");

        dtb_file = qemu_opt_get(machine_opts, "dtb");

        tmp = qemu_opt_get(machine_opts, "dt_compatible");

        if (tmp) {

            compatible = tmp;

            compatible_len = strlen(compatible) + 1;

        }

    }

    if (dtb_file) {

        char *filename;

        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, dtb_file);

        if (!filename) {

            goto out;

        }

        fdt = load_device_tree(filename, &fdt_size);

        if (!fdt) {

            goto out;

        }

        goto done;

    }

    fdt = create_device_tree(&fdt_size);

    if (fdt == NULL) {

        goto out;

    }

    /* Manipulate device tree in memory. */

    qemu_devtree_setprop_string(fdt, "/", "model", model);

    qemu_devtree_setprop(fdt, "/", "compatible", compatible, compatible_len);

    qemu_devtree_setprop_cell(fdt, "/", "#address-cells", 2);

    qemu_devtree_setprop_cell(fdt, "/", "#size-cells", 2);

    qemu_devtree_add_subnode(fdt, "/memory");

    qemu_devtree_setprop_string(fdt, "/memory", "device_type", "memory");

    qemu_devtree_setprop(fdt, "/memory", "reg", mem_reg_property,

                         sizeof(mem_reg_property));

    qemu_devtree_add_subnode(fdt, "/chosen");

    if (initrd_size) {

        ret = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-start",

                                        initrd_base);

        if (ret < 0) {

            fprintf(stderr, "couldn't set /chosen/linux,initrd-start\n");

        }

        ret = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-end",

                                        (initrd_base + initrd_size));

        if (ret < 0) {

            fprintf(stderr, "couldn't set /chosen/linux,initrd-end\n");

        }

    }

    ret = qemu_devtree_setprop_string(fdt, "/chosen", "bootargs",

                                      kernel_cmdline);

    if (ret < 0)

        fprintf(stderr, "couldn't set /chosen/bootargs\n");

    if (kvm_enabled()) {

        /* Read out host's frequencies */

        clock_freq = kvmppc_get_clockfreq();

        tb_freq = kvmppc_get_tbfreq();

        /* indicate KVM hypercall interface */

        qemu_devtree_add_subnode(fdt, "/hypervisor");

        qemu_devtree_setprop_string(fdt, "/hypervisor", "compatible",

                                    "linux,kvm");

        kvmppc_get_hypercall(env, hypercall, sizeof(hypercall));

        qemu_devtree_setprop(fdt, "/hypervisor", "hcall-instructions",

                             hypercall, sizeof(hypercall));

    }

    /* Create CPU nodes */

    qemu_devtree_add_subnode(fdt, "/cpus");

    qemu_devtree_setprop_cell(fdt, "/cpus", "#address-cells", 1);

    qemu_devtree_setprop_cell(fdt, "/cpus", "#size-cells", 0);

    /* We need to generate the cpu nodes in reverse order, so Linux can pick

       the first node as boot node and be happy */

    for (i = smp_cpus - 1; i >= 0; i--) {

        char cpu_name[128];

        uint64_t cpu_release_addr = MPC8544_SPIN_BASE + (i * 0x20);

        for (env = first_cpu; env != NULL; env = env->next_cpu) {

            if (env->cpu_index == i) {

                break;

            }

        }

        if (!env) {

            continue;

        }

        snprintf(cpu_name, sizeof(cpu_name), "/cpus/PowerPC,8544@%x", env->cpu_index);

        qemu_devtree_add_subnode(fdt, cpu_name);

        qemu_devtree_setprop_cell(fdt, cpu_name, "clock-frequency", clock_freq);

        qemu_devtree_setprop_cell(fdt, cpu_name, "timebase-frequency", tb_freq);

        qemu_devtree_setprop_string(fdt, cpu_name, "device_type", "cpu");

        qemu_devtree_setprop_cell(fdt, cpu_name, "reg", env->cpu_index);

        qemu_devtree_setprop_cell(fdt, cpu_name, "d-cache-line-size",

                                  env->dcache_line_size);

        qemu_devtree_setprop_cell(fdt, cpu_name, "i-cache-line-size",

                                  env->icache_line_size);

        qemu_devtree_setprop_cell(fdt, cpu_name, "d-cache-size", 0x8000);

        qemu_devtree_setprop_cell(fdt, cpu_name, "i-cache-size", 0x8000);

        qemu_devtree_setprop_cell(fdt, cpu_name, "bus-frequency", 0);

        if (env->cpu_index) {

            qemu_devtree_setprop_string(fdt, cpu_name, "status", "disabled");

            qemu_devtree_setprop_string(fdt, cpu_name, "enable-method", "spin-table");

            qemu_devtree_setprop_u64(fdt, cpu_name, "cpu-release-addr",

                                     cpu_release_addr);

        } else {

            qemu_devtree_setprop_string(fdt, cpu_name, "status", "okay");

        }

    }

    qemu_devtree_add_subnode(fdt, "/aliases");

    /* XXX These should go into their respective devices' code */

    snprintf(soc, sizeof(soc), "/soc@%llx", MPC8544_CCSRBAR_BASE);

    qemu_devtree_add_subnode(fdt, soc);

    qemu_devtree_setprop_string(fdt, soc, "device_type", "soc");

    qemu_devtree_setprop(fdt, soc, "compatible", compatible_sb,

                         sizeof(compatible_sb));

    qemu_devtree_setprop_cell(fdt, soc, "#address-cells", 1);

    qemu_devtree_setprop_cell(fdt, soc, "#size-cells", 1);

    qemu_devtree_setprop_cells(fdt, soc, "ranges", 0x0,

                               MPC8544_CCSRBAR_BASE >> 32, MPC8544_CCSRBAR_BASE,

                               MPC8544_CCSRBAR_SIZE);

    /* XXX should contain a reasonable value */

    qemu_devtree_setprop_cell(fdt, soc, "bus-frequency", 0);

    snprintf(mpic, sizeof(mpic), "%s/pic@%llx", soc,

             MPC8544_MPIC_REGS_BASE - MPC8544_CCSRBAR_BASE);

    qemu_devtree_add_subnode(fdt, mpic);

    qemu_devtree_setprop_string(fdt, mpic, "device_type", "open-pic");

    qemu_devtree_setprop_string(fdt, mpic, "compatible", "fsl,mpic");

    qemu_devtree_setprop_cells(fdt, mpic, "reg", MPC8544_MPIC_REGS_BASE -

                               MPC8544_CCSRBAR_BASE, 0x40000);

    qemu_devtree_setprop_cell(fdt, mpic, "#address-cells", 0);

    qemu_devtree_setprop_cell(fdt, mpic, "#interrupt-cells", 4);

    mpic_ph = qemu_devtree_alloc_phandle(fdt);

    qemu_devtree_setprop_cell(fdt, mpic, "phandle", mpic_ph);

    qemu_devtree_setprop_cell(fdt, mpic, "linux,phandle", mpic_ph);

    qemu_devtree_setprop(fdt, mpic, "interrupt-controller", NULL, 0);

    qemu_devtree_setprop(fdt, mpic, "big-endian", NULL, 0);

    qemu_devtree_setprop(fdt, mpic, "single-cpu-affinity", NULL, 0);

    qemu_devtree_setprop_cell(fdt, mpic, "last-interrupt-source", 255);

    /*

     * We have to generate ser1 first, because Linux takes the first

     * device it finds in the dt as serial output device. And we generate

     * devices in reverse order to the dt.

     */

    dt_serial_create(fdt, MPC8544_SERIAL1_REGS_BASE - MPC8544_CCSRBAR_BASE,

                     soc, mpic, "serial1", 1, false);

    dt_serial_create(fdt, MPC8544_SERIAL0_REGS_BASE - MPC8544_CCSRBAR_BASE,

                     soc, mpic, "serial0", 0, true);

    snprintf(gutil, sizeof(gutil), "%s/global-utilities@%llx", soc,

             MPC8544_UTIL_BASE - MPC8544_CCSRBAR_BASE);

    qemu_devtree_add_subnode(fdt, gutil);

    qemu_devtree_setprop_string(fdt, gutil, "compatible", "fsl,mpc8544-guts");

    qemu_devtree_setprop_cells(fdt, gutil, "reg", MPC8544_UTIL_BASE -

                               MPC8544_CCSRBAR_BASE, 0x1000);

    qemu_devtree_setprop(fdt, gutil, "fsl,has-rstcr", NULL, 0);

    snprintf(pci, sizeof(pci), "/pci@%llx", MPC8544_PCI_REGS_BASE);

    qemu_devtree_add_subnode(fdt, pci);

    qemu_devtree_setprop_cell(fdt, pci, "cell-index", 0);

    qemu_devtree_setprop_string(fdt, pci, "compatible", "fsl,mpc8540-pci");

    qemu_devtree_setprop_string(fdt, pci, "device_type", "pci");

    qemu_devtree_setprop_cells(fdt, pci, "interrupt-map-mask", 0xf800, 0x0,

                               0x0, 0x7);

    pci_map_create(fdt, pci_map, qemu_devtree_get_phandle(fdt, mpic));

    qemu_devtree_setprop(fdt, pci, "interrupt-map", pci_map, sizeof(pci_map));

    qemu_devtree_setprop_phandle(fdt, pci, "interrupt-parent", mpic);

    qemu_devtree_setprop_cells(fdt, pci, "interrupts", 24, 2, 0, 0);

    qemu_devtree_setprop_cells(fdt, pci, "bus-range", 0, 255);

    for (i = 0; i < 14; i++) {

        pci_ranges[i] = cpu_to_be32(pci_ranges[i]);

    }

    qemu_devtree_setprop(fdt, pci, "ranges", pci_ranges, sizeof(pci_ranges));

    qemu_devtree_setprop_cells(fdt, pci, "reg", MPC8544_PCI_REGS_BASE >> 32,

                               MPC8544_PCI_REGS_BASE, 0, 0x1000);

    qemu_devtree_setprop_cell(fdt, pci, "clock-frequency", 66666666);

    qemu_devtree_setprop_cell(fdt, pci, "#interrupt-cells", 1);

    qemu_devtree_setprop_cell(fdt, pci, "#size-cells", 2);

    qemu_devtree_setprop_cell(fdt, pci, "#address-cells", 3);

    qemu_devtree_setprop_string(fdt, "/aliases", "pci0", pci);

done:

    if (dumpdtb) {

        /* Dump the dtb to a file and quit */

        FILE *f = fopen(dumpdtb, "wb");

        size_t len;

        len = fwrite(fdt, fdt_size, 1, f);

        fclose(f);

        if (len != fdt_size) {

            exit(1);

        }

        exit(0);

    }

    ret = rom_add_blob_fixed(BINARY_DEVICE_TREE_FILE, fdt, fdt_size, addr);

    if (ret < 0) {

        goto out;

    }

    g_free(fdt);

    ret = fdt_size;

out:

    return ret;

}

/* Create -kernel TLB entries for BookE.  */

static inline target_phys_addr_t booke206_page_size_to_tlb(uint64_t size)

{

    return 63 - clz64(size >> 10);

}

static void mmubooke_create_initial_mapping(CPUPPCState *env)

{

    struct boot_info *bi = env->load_info;

    ppcmas_tlb_t *tlb = booke206_get_tlbm(env, 1, 0, 0);

    target_phys_addr_t size, dt_end;

    int ps;

    /* Our initial TLB entry needs to cover everything from 0 to

       the device tree top */

    dt_end = bi->dt_base + bi->dt_size;

    ps = booke206_page_size_to_tlb(dt_end) + 1;

    size = (ps << MAS1_TSIZE_SHIFT);

    tlb->mas1 = MAS1_VALID | size;

    tlb->mas2 = 0;

    tlb->mas7_3 = 0;

    tlb->mas7_3 |= MAS3_UR | MAS3_UW | MAS3_UX | MAS3_SR | MAS3_SW | MAS3_SX;

    env->tlb_dirty = true;

}

static void mpc8544ds_cpu_reset_sec(void *opaque)

{

    PowerPCCPU *cpu = opaque;

    CPUPPCState *env = &cpu->env;

    cpu_reset(CPU(cpu));

    /* Secondary CPU starts in halted state for now. Needs to change when

       implementing non-kernel boot. */

    env->halted = 1;

    env->exception_index = EXCP_HLT;

}

static void mpc8544ds_cpu_reset(void *opaque)

{

    PowerPCCPU *cpu = opaque;

    CPUPPCState *env = &cpu->env;

    struct boot_info *bi = env->load_info;

    cpu_reset(CPU(cpu));

    /* Set initial guest state. */

    env->halted = 0;

    env->gpr[1] = (16<<20) - 8;

    env->gpr[3] = bi->dt_base;

    env->nip = bi->entry;

    mmubooke_create_initial_mapping(env);

}

static void mpc8544ds_init(ram_addr_t ram_size,

                         const char *boot_device,

                         const char *kernel_filename,

                         const char *kernel_cmdline,

                         const char *initrd_filename,

                         const char *cpu_model)

{

    MemoryRegion *address_space_mem = get_system_memory();

    MemoryRegion *ram = g_new(MemoryRegion, 1);

    PCIBus *pci_bus;

    CPUPPCState *env = NULL;

    uint64_t elf_entry;

    uint64_t elf_lowaddr;

    target_phys_addr_t entry=0;

    target_phys_addr_t loadaddr=UIMAGE_LOAD_BASE;

    target_long kernel_size=0;

    target_ulong dt_base = 0;

    target_ulong initrd_base = 0;

    target_long initrd_size=0;

    int i=0;

    unsigned int pci_irq_nrs[4] = {1, 2, 3, 4};

    qemu_irq **irqs, *mpic;

    DeviceState *dev;

    CPUPPCState *firstenv = NULL;

    /* Setup CPUs */

    if (cpu_model == NULL) {

        cpu_model = "e500v2_v30";

    }

    irqs = g_malloc0(smp_cpus * sizeof(qemu_irq *));

    irqs[0] = g_malloc0(smp_cpus * sizeof(qemu_irq) * OPENPIC_OUTPUT_NB);

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

        PowerPCCPU *cpu;

        qemu_irq *input;

        cpu = cpu_ppc_init(cpu_model);

        if (cpu == NULL) {

            fprintf(stderr, "Unable to initialize CPU!\n");

            exit(1);

        }

        env = &cpu->env;

        if (!firstenv) {

            firstenv = env;

        }

        irqs[i] = irqs[0] + (i * OPENPIC_OUTPUT_NB);

        input = (qemu_irq *)env->irq_inputs;

        irqs[i][OPENPIC_OUTPUT_INT] = input[PPCE500_INPUT_INT];

        irqs[i][OPENPIC_OUTPUT_CINT] = input[PPCE500_INPUT_CINT];

        env->spr[SPR_BOOKE_PIR] = env->cpu_index = i;

        env->mpic_cpu_base = MPC8544_MPIC_REGS_BASE + 0x20000;

        ppc_booke_timers_init(env, 400000000, PPC_TIMER_E500);

        /* Register reset handler */

        if (!i) {

            /* Primary CPU */

            struct boot_info *boot_info;

            boot_info = g_malloc0(sizeof(struct boot_info));

            qemu_register_reset(mpc8544ds_cpu_reset, cpu);

            env->load_info = boot_info;

        } else {

            /* Secondary CPUs */

            qemu_register_reset(mpc8544ds_cpu_reset_sec, cpu);

        }

    }

    env = firstenv;

    /* Fixup Memory size on a alignment boundary */

    ram_size &= ~(RAM_SIZES_ALIGN - 1);

    /* Register Memory */

    memory_region_init_ram(ram, "mpc8544ds.ram", ram_size);

    vmstate_register_ram_global(ram);

    memory_region_add_subregion(address_space_mem, 0, ram);

    /* MPIC */

    mpic = mpic_init(address_space_mem, MPC8544_MPIC_REGS_BASE,

                     smp_cpus, irqs, NULL);

    if (!mpic) {

        cpu_abort(env, "MPIC failed to initialize\n");

    }

    /* Serial */

    if (serial_hds[0]) {

        serial_mm_init(address_space_mem, MPC8544_SERIAL0_REGS_BASE,

                       0, mpic[12+26], 399193,

                       serial_hds[0], DEVICE_BIG_ENDIAN);

    }

    if (serial_hds[1]) {

        serial_mm_init(address_space_mem, MPC8544_SERIAL1_REGS_BASE,

                       0, mpic[12+26], 399193,

                       serial_hds[0], DEVICE_BIG_ENDIAN);

    }

    /* General Utility device */

    sysbus_create_simple("mpc8544-guts", MPC8544_UTIL_BASE, NULL);

    /* PCI */

    dev = sysbus_create_varargs("e500-pcihost", MPC8544_PCI_REGS_BASE,

                                mpic[pci_irq_nrs[0]], mpic[pci_irq_nrs[1]],

                                mpic[pci_irq_nrs[2]], mpic[pci_irq_nrs[3]],

                                NULL);

    pci_bus = (PCIBus *)qdev_get_child_bus(dev, "pci.0");

    if (!pci_bus)

        printf("couldn't create PCI controller!\n");

    isa_mmio_init(MPC8544_PCI_IO, MPC8544_PCI_IOLEN);

    if (pci_bus) {

        /* Register network interfaces. */

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

            pci_nic_init_nofail(&nd_table[i], "virtio", NULL);

        }

    }

    /* Register spinning region */

    sysbus_create_simple("e500-spin", MPC8544_SPIN_BASE, NULL);

    /* Load kernel. */

    if (kernel_filename) {

        kernel_size = load_uimage(kernel_filename, &entry, &loadaddr, NULL);

        if (kernel_size < 0) {

            kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,

                                   &elf_lowaddr, NULL, 1, ELF_MACHINE, 0);

            entry = elf_entry;

            loadaddr = elf_lowaddr;

        }

        /* XXX try again as binary */

        if (kernel_size < 0) {

            fprintf(stderr, "qemu: could not load kernel '%s'\n",

                    kernel_filename);

            exit(1);

        }

    }

    /* Load initrd. */

    if (initrd_filename) {

        initrd_base = (kernel_size + INITRD_LOAD_PAD) & ~INITRD_PAD_MASK;

        initrd_size = load_image_targphys(initrd_filename, initrd_base,

                                          ram_size - initrd_base);

        if (initrd_size < 0) {

            fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",

                    initrd_filename);

            exit(1);

        }

    }

    /* If we're loading a kernel directly, we must load the device tree too. */

    if (kernel_filename) {

        struct boot_info *boot_info;

        int dt_size;

        dt_base = (loadaddr + kernel_size + DTC_LOAD_PAD) & ~DTC_PAD_MASK;

        dt_size = mpc8544_load_device_tree(env, dt_base, ram_size, initrd_base,

                                           initrd_size, kernel_cmdline);

        if (dt_size < 0) {

            fprintf(stderr, "couldn't load device tree\n");

            exit(1);

        }

        boot_info = env->load_info;

        boot_info->entry = entry;

        boot_info->dt_base = dt_base;

        boot_info->dt_size = dt_size;

    }

    if (kvm_enabled()) {

        kvmppc_init();

    }

}

static QEMUMachine mpc8544ds_machine = {

    .name = "mpc8544ds",

    .desc = "mpc8544ds",

    .init = mpc8544ds_init,

    .max_cpus = 15,

};

static void mpc8544ds_machine_init(void)

{

    qemu_register_machine(&mpc8544ds_machine);

}

machine_init(mpc8544ds_machine_init);