hw/mips_mipssim.c

   1 /*
   2  * QEMU/mipssim emulation
   3  *
   4  * Emulates a very simple machine model similiar to the one use by the
   5  * proprietary MIPS emulator.
   6  *
   7  * Copyright (c) 2007 Thiemo Seufer
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #include "hw.h"
  28 #include "mips.h"
  29 #include "mips_cpudevs.h"
  30 #include "pc.h"
  31 #include "isa.h"
  32 #include "net.h"
  33 #include "sysemu.h"
  34 #include "boards.h"
  35 #include "mips-bios.h"
  36 #include "loader.h"
  37 #include "elf.h"
  38 #include "sysbus.h"
  39 #include "exec-memory.h"
  40
  41 static struct _loaderparams {
  42     int ram_size;
  43     const char *kernel_filename;
  44     const char *kernel_cmdline;
  45     const char *initrd_filename;
  46 } loaderparams;
  47
  48 typedef struct ResetData {
  49     CPUState *env;
  50     uint64_t vector;
  51 } ResetData;
  52
  53 static int64_t load_kernel(void)
  54 {
  55     int64_t entry, kernel_high;
  56     long kernel_size;
  57     long initrd_size;
  58     ram_addr_t initrd_offset;
  59     int big_endian;
  60
  61 #ifdef TARGET_WORDS_BIGENDIAN
  62     big_endian = 1;
  63 #else
  64     big_endian = 0;
  65 #endif
  66
  67     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
  68                            NULL, (uint64_t *)&entry, NULL,
  69                            (uint64_t *)&kernel_high, big_endian,
  70                            ELF_MACHINE, 1);
  71     if (kernel_size >= 0) {
  72         if ((entry & ~0x7fffffffULL) == 0x80000000)
  73             entry = (int32_t)entry;
  74     } else {
  75         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  76                 loaderparams.kernel_filename);
  77         exit(1);
  78     }
  79
  80     /* load initrd */
  81     initrd_size = 0;
  82     initrd_offset = 0;
  83     if (loaderparams.initrd_filename) {
  84         initrd_size = get_image_size (loaderparams.initrd_filename);
  85         if (initrd_size > 0) {
  86             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  87             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  88                 fprintf(stderr,
  89                         "qemu: memory too small for initial ram disk '%s'\n",
  90                         loaderparams.initrd_filename);
  91                 exit(1);
  92             }
  93             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  94                 initrd_offset, loaderparams.ram_size - initrd_offset);
  95         }
  96         if (initrd_size == (target_ulong) -1) {
  97             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  98                     loaderparams.initrd_filename);
  99             exit(1);
 100         }
 101     }
 102     return entry;
 103 }
 104
 105 static void main_cpu_reset(void *opaque)
 106 {
 107     ResetData *s = (ResetData *)opaque;
 108     CPUState *env = s->env;
 109
 110     cpu_reset(env);
 111     env->active_tc.PC = s->vector & ~(target_ulong)1;
 112     if (s->vector & 1) {
 113         env->hflags |= MIPS_HFLAG_M16;
 114     }
 115 }
 116
 117 static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)
 118 {
 119     DeviceState *dev;
 120     SysBusDevice *s;
 121
 122     dev = qdev_create(NULL, "mipsnet");
 123     qdev_set_nic_properties(dev, nd);
 124     qdev_init_nofail(dev);
 125
 126     s = sysbus_from_qdev(dev);
 127     sysbus_connect_irq(s, 0, irq);
 128     memory_region_add_subregion(get_system_io(),
 129                                 base,
 130                                 sysbus_mmio_get_region(s, 0));
 131 }
 132
 133 static void
 134 mips_mipssim_init (ram_addr_t ram_size,
 135                    const char *boot_device,
 136                    const char *kernel_filename, const char *kernel_cmdline,
 137                    const char *initrd_filename, const char *cpu_model)
 138 {
 139     char *filename;
 140     ram_addr_t ram_offset;
 141     ram_addr_t bios_offset;
 142     CPUState *env;
 143     ResetData *reset_info;
 144     int bios_size;
 145
 146     /* Init CPUs. */
 147     if (cpu_model == NULL) {
 148 #ifdef TARGET_MIPS64
 149         cpu_model = "5Kf";
 150 #else
 151         cpu_model = "24Kf";
 152 #endif
 153     }
 154     env = cpu_init(cpu_model);
 155     if (!env) {
 156         fprintf(stderr, "Unable to find CPU definition\n");
 157         exit(1);
 158     }
 159     reset_info = g_malloc0(sizeof(ResetData));
 160     reset_info->env = env;
 161     reset_info->vector = env->active_tc.PC;
 162     qemu_register_reset(main_cpu_reset, reset_info);
 163
 164     /* Allocate RAM. */
 165     ram_offset = qemu_ram_alloc(NULL, "mips_mipssim.ram", ram_size);
 166     bios_offset = qemu_ram_alloc(NULL, "mips_mipssim.bios", BIOS_SIZE);
 167
 168     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 169
 170     /* Map the BIOS / boot exception handler. */
 171     cpu_register_physical_memory(0x1fc00000LL,
 172                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 173     /* Load a BIOS / boot exception handler image. */
 174     if (bios_name == NULL)
 175         bios_name = BIOS_FILENAME;
 176     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 177     if (filename) {
 178         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 179         g_free(filename);
 180     } else {
 181         bios_size = -1;
 182     }
 183     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 184         /* Bail out if we have neither a kernel image nor boot vector code. */
 185         fprintf(stderr,
 186                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 187                 filename);
 188         exit(1);
 189     } else {
 190         /* We have a boot vector start address. */
 191         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 192     }
 193
 194     if (kernel_filename) {
 195         loaderparams.ram_size = ram_size;
 196         loaderparams.kernel_filename = kernel_filename;
 197         loaderparams.kernel_cmdline = kernel_cmdline;
 198         loaderparams.initrd_filename = initrd_filename;
 199         reset_info->vector = load_kernel();
 200     }
 201
 202     /* Init CPU internal devices. */
 203     cpu_mips_irq_init_cpu(env);
 204     cpu_mips_clock_init(env);
 205
 206     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 207     isa_mmio_init(0x1fd00000, 0x00010000);
 208
 209     /* A single 16450 sits at offset 0x3f8. It is attached to
 210        MIPS CPU INT2, which is interrupt 4. */
 211     if (serial_hds[0])
 212         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 213
 214     if (nd_table[0].vlan)
 215         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 216         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 217 }
 218
 219 static QEMUMachine mips_mipssim_machine = {
 220     .name = "mipssim",
 221     .desc = "MIPS MIPSsim platform",
 222     .init = mips_mipssim_init,
 223 };
 224
 225 static void mips_mipssim_machine_init(void)
 226 {
 227     qemu_register_machine(&mips_mipssim_machine);
 228 }
 229
 230 machine_init(mips_mipssim_machine_init);