hw/mips/mipssim.c

   1 /*
   2  * QEMU/mipssim emulation
   3  *
   4  * Emulates a very simple machine model similar to the one used 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
  28 #include "qemu/osdep.h"
  29 #include "qapi/error.h"
  30 #include "qemu/datadir.h"
  31 #include "exec/address-spaces.h"
  32 #include "hw/clock.h"
  33 #include "hw/mips/mips.h"
  34 #include "hw/char/serial-mm.h"
  35 #include "net/net.h"
  36 #include "sysemu/sysemu.h"
  37 #include "hw/boards.h"
  38 #include "hw/loader.h"
  39 #include "elf.h"
  40 #include "hw/sysbus.h"
  41 #include "hw/qdev-properties.h"
  42 #include "qemu/error-report.h"
  43 #include "sysemu/qtest.h"
  44 #include "sysemu/reset.h"
  45 #include "cpu.h"
  46
  47 #define BIOS_SIZE (4 * MiB)
  48
  49 #if TARGET_BIG_ENDIAN
  50 #define BIOS_FILENAME "mips_bios.bin"
  51 #else
  52 #define BIOS_FILENAME "mipsel_bios.bin"
  53 #endif
  54
  55 static struct _loaderparams {
  56     int ram_size;
  57     const char *kernel_filename;
  58     const char *kernel_cmdline;
  59     const char *initrd_filename;
  60 } loaderparams;
  61
  62 typedef struct ResetData {
  63     MIPSCPU *cpu;
  64     uint64_t vector;
  65 } ResetData;
  66
  67 static uint64_t load_kernel(void)
  68 {
  69     uint64_t entry, kernel_high, initrd_size;
  70     long kernel_size;
  71     ram_addr_t initrd_offset;
  72
  73     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
  74                            cpu_mips_kseg0_to_phys, NULL,
  75                            &entry, NULL,
  76                            &kernel_high, NULL, TARGET_BIG_ENDIAN,
  77                            EM_MIPS, 1, 0);
  78     if (kernel_size < 0) {
  79         error_report("could not load kernel '%s': %s",
  80                      loaderparams.kernel_filename,
  81                      load_elf_strerror(kernel_size));
  82         exit(1);
  83     }
  84
  85     /* load initrd */
  86     initrd_size = 0;
  87     initrd_offset = 0;
  88     if (loaderparams.initrd_filename) {
  89         initrd_size = get_image_size(loaderparams.initrd_filename);
  90         if (initrd_size > 0) {
  91             initrd_offset = ROUND_UP(kernel_high, INITRD_PAGE_SIZE);
  92             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  93                 error_report("memory too small for initial ram disk '%s'",
  94                              loaderparams.initrd_filename);
  95                 exit(1);
  96             }
  97             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  98                 initrd_offset, loaderparams.ram_size - initrd_offset);
  99         }
 100         if (initrd_size == (target_ulong) -1) {
 101             error_report("could not load initial ram disk '%s'",
 102                          loaderparams.initrd_filename);
 103             exit(1);
 104         }
 105     }
 106     return entry;
 107 }
 108
 109 static void main_cpu_reset(void *opaque)
 110 {
 111     ResetData *s = (ResetData *)opaque;
 112     CPUMIPSState *env = &s->cpu->env;
 113
 114     cpu_reset(CPU(s->cpu));
 115     env->active_tc.PC = s->vector & ~(target_ulong)1;
 116     if (s->vector & 1) {
 117         env->hflags |= MIPS_HFLAG_M16;
 118     }
 119 }
 120
 121 static void mipsnet_init(int base, qemu_irq irq)
 122 {
 123     DeviceState *dev;
 124     SysBusDevice *s;
 125
 126     dev = qemu_create_nic_device("mipsnet", true, NULL);
 127     if (!dev) {
 128         return;
 129     }
 130
 131     s = SYS_BUS_DEVICE(dev);
 132     sysbus_realize_and_unref(s, &error_fatal);
 133     sysbus_connect_irq(s, 0, irq);
 134     memory_region_add_subregion(get_system_io(),
 135                                 base,
 136                                 sysbus_mmio_get_region(s, 0));
 137 }
 138
 139 static void
 140 mips_mipssim_init(MachineState *machine)
 141 {
 142     const char *kernel_filename = machine->kernel_filename;
 143     const char *kernel_cmdline = machine->kernel_cmdline;
 144     const char *initrd_filename = machine->initrd_filename;
 145     char *filename;
 146     MemoryRegion *address_space_mem = get_system_memory();
 147     MemoryRegion *isa = g_new(MemoryRegion, 1);
 148     MemoryRegion *bios = g_new(MemoryRegion, 1);
 149     Clock *cpuclk;
 150     MIPSCPU *cpu;
 151     CPUMIPSState *env;
 152     ResetData *reset_info;
 153     int bios_size;
 154
 155     cpuclk = clock_new(OBJECT(machine), "cpu-refclk");
 156 #ifdef TARGET_MIPS64
 157     clock_set_hz(cpuclk, 6000000); /* 6 MHz */
 158 #else
 159     clock_set_hz(cpuclk, 12000000); /* 12 MHz */
 160 #endif
 161
 162     /* Init CPUs. */
 163     cpu = mips_cpu_create_with_clock(machine->cpu_type, cpuclk,
 164                                      TARGET_BIG_ENDIAN);
 165     env = &cpu->env;
 166
 167     reset_info = g_new0(ResetData, 1);
 168     reset_info->cpu = cpu;
 169     reset_info->vector = env->active_tc.PC;
 170     qemu_register_reset(main_cpu_reset, reset_info);
 171
 172     /* Allocate RAM. */
 173     memory_region_init_rom(bios, NULL, "mips_mipssim.bios", BIOS_SIZE,
 174                            &error_fatal);
 175
 176     memory_region_add_subregion(address_space_mem, 0, machine->ram);
 177
 178     /* Map the BIOS / boot exception handler. */
 179     memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
 180     /* Load a BIOS / boot exception handler image. */
 181     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, machine->firmware ?: BIOS_FILENAME);
 182     if (filename) {
 183         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 184         g_free(filename);
 185     } else {
 186         bios_size = -1;
 187     }
 188     if ((bios_size < 0 || bios_size > BIOS_SIZE) &&
 189         machine->firmware && !qtest_enabled()) {
 190         /* Bail out if we have neither a kernel image nor boot vector code. */
 191         error_report("Could not load MIPS bios '%s'", machine->firmware);
 192         exit(1);
 193     } else {
 194         /* We have a boot vector start address. */
 195         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 196     }
 197
 198     if (kernel_filename) {
 199         loaderparams.ram_size = machine->ram_size;
 200         loaderparams.kernel_filename = kernel_filename;
 201         loaderparams.kernel_cmdline = kernel_cmdline;
 202         loaderparams.initrd_filename = initrd_filename;
 203         reset_info->vector = load_kernel();
 204     }
 205
 206     /* Init CPU internal devices. */
 207     cpu_mips_irq_init_cpu(cpu);
 208     cpu_mips_clock_init(cpu);
 209
 210     /*
 211      * Register 64 KB of ISA IO space at 0x1fd00000.  But without interrupts
 212      * (except for the hardcoded serial port interrupt) -device cannot work,
 213      * so do not expose the ISA bus to the user.
 214      */
 215     memory_region_init_alias(isa, NULL, "isa_mmio",
 216                              get_system_io(), 0, 0x00010000);
 217     memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa);
 218
 219     /*
 220      * A single 16450 sits at offset 0x3f8. It is attached to
 221      * MIPS CPU INT2, which is interrupt 4.
 222      */
 223     if (serial_hd(0)) {
 224         DeviceState *dev = qdev_new(TYPE_SERIAL_MM);
 225
 226         qdev_prop_set_chr(dev, "chardev", serial_hd(0));
 227         qdev_prop_set_uint8(dev, "regshift", 0);
 228         qdev_prop_set_uint8(dev, "endianness", DEVICE_LITTLE_ENDIAN);
 229         sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
 230         sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, env->irq[4]);
 231         memory_region_add_subregion(get_system_io(), 0x3f8,
 232                       sysbus_mmio_get_region(SYS_BUS_DEVICE(dev), 0));
 233     }
 234
 235     /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 236     mipsnet_init(0x4200, env->irq[2]);
 237 }
 238
 239 static void mips_mipssim_machine_init(MachineClass *mc)
 240 {
 241     mc->desc = "MIPS MIPSsim platform";
 242     mc->init = mips_mipssim_init;
 243 #ifdef TARGET_MIPS64
 244     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("5Kf");
 245 #else
 246     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf");
 247 #endif
 248     mc->default_ram_id = "mips_mipssim.ram";
 249 }
 250
 251 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init)