hw/mips/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-common.h"
  31 #include "cpu.h"
  32 #include "hw/mips/mips.h"
  33 #include "hw/mips/cpudevs.h"
  34 #include "hw/char/serial.h"
  35 #include "hw/isa/isa.h"
  36 #include "net/net.h"
  37 #include "sysemu/sysemu.h"
  38 #include "hw/boards.h"
  39 #include "hw/mips/bios.h"
  40 #include "hw/loader.h"
  41 #include "elf.h"
  42 #include "hw/sysbus.h"
  43 #include "exec/address-spaces.h"
  44 #include "qemu/error-report.h"
  45 #include "sysemu/qtest.h"
  46 #include "sysemu/reset.h"
  47
  48 static struct _loaderparams {
  49     int ram_size;
  50     const char *kernel_filename;
  51     const char *kernel_cmdline;
  52     const char *initrd_filename;
  53 } loaderparams;
  54
  55 typedef struct ResetData {
  56     MIPSCPU *cpu;
  57     uint64_t vector;
  58 } ResetData;
  59
  60 static int64_t load_kernel(void)
  61 {
  62     int64_t entry, kernel_high, initrd_size;
  63     long kernel_size;
  64     ram_addr_t initrd_offset;
  65     int big_endian;
  66
  67 #ifdef TARGET_WORDS_BIGENDIAN
  68     big_endian = 1;
  69 #else
  70     big_endian = 0;
  71 #endif
  72
  73     kernel_size = load_elf(loaderparams.kernel_filename, NULL,
  74                            cpu_mips_kseg0_to_phys, NULL,
  75                            (uint64_t *)&entry, NULL,
  76                            (uint64_t *)&kernel_high, big_endian,
  77                            EM_MIPS, 1, 0);
  78     if (kernel_size >= 0) {
  79         if ((entry & ~0x7fffffffULL) == 0x80000000)
  80             entry = (int32_t)entry;
  81     } else {
  82         error_report("could not load kernel '%s': %s",
  83                      loaderparams.kernel_filename,
  84                      load_elf_strerror(kernel_size));
  85         exit(1);
  86     }
  87
  88     /* load initrd */
  89     initrd_size = 0;
  90     initrd_offset = 0;
  91     if (loaderparams.initrd_filename) {
  92         initrd_size = get_image_size (loaderparams.initrd_filename);
  93         if (initrd_size > 0) {
  94             initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
  95             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  96                 error_report("memory too small for initial ram disk '%s'",
  97                              loaderparams.initrd_filename);
  98                 exit(1);
  99             }
 100             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 101                 initrd_offset, loaderparams.ram_size - initrd_offset);
 102         }
 103         if (initrd_size == (target_ulong) -1) {
 104             error_report("could not load initial ram disk '%s'",
 105                          loaderparams.initrd_filename);
 106             exit(1);
 107         }
 108     }
 109     return entry;
 110 }
 111
 112 static void main_cpu_reset(void *opaque)
 113 {
 114     ResetData *s = (ResetData *)opaque;
 115     CPUMIPSState *env = &s->cpu->env;
 116
 117     cpu_reset(CPU(s->cpu));
 118     env->active_tc.PC = s->vector & ~(target_ulong)1;
 119     if (s->vector & 1) {
 120         env->hflags |= MIPS_HFLAG_M16;
 121     }
 122 }
 123
 124 static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd)
 125 {
 126     DeviceState *dev;
 127     SysBusDevice *s;
 128
 129     dev = qdev_create(NULL, "mipsnet");
 130     qdev_set_nic_properties(dev, nd);
 131     qdev_init_nofail(dev);
 132
 133     s = SYS_BUS_DEVICE(dev);
 134     sysbus_connect_irq(s, 0, irq);
 135     memory_region_add_subregion(get_system_io(),
 136                                 base,
 137                                 sysbus_mmio_get_region(s, 0));
 138 }
 139
 140 static void
 141 mips_mipssim_init(MachineState *machine)
 142 {
 143     ram_addr_t ram_size = machine->ram_size;
 144     const char *kernel_filename = machine->kernel_filename;
 145     const char *kernel_cmdline = machine->kernel_cmdline;
 146     const char *initrd_filename = machine->initrd_filename;
 147     char *filename;
 148     MemoryRegion *address_space_mem = get_system_memory();
 149     MemoryRegion *isa = g_new(MemoryRegion, 1);
 150     MemoryRegion *ram = g_new(MemoryRegion, 1);
 151     MemoryRegion *bios = g_new(MemoryRegion, 1);
 152     MIPSCPU *cpu;
 153     CPUMIPSState *env;
 154     ResetData *reset_info;
 155     int bios_size;
 156
 157     /* Init CPUs. */
 158     cpu = MIPS_CPU(cpu_create(machine->cpu_type));
 159     env = &cpu->env;
 160
 161     reset_info = g_malloc0(sizeof(ResetData));
 162     reset_info->cpu = cpu;
 163     reset_info->vector = env->active_tc.PC;
 164     qemu_register_reset(main_cpu_reset, reset_info);
 165
 166     /* Allocate RAM. */
 167     memory_region_allocate_system_memory(ram, NULL, "mips_mipssim.ram",
 168                                          ram_size);
 169     memory_region_init_ram(bios, NULL, "mips_mipssim.bios", BIOS_SIZE,
 170                            &error_fatal);
 171     memory_region_set_readonly(bios, true);
 172
 173     memory_region_add_subregion(address_space_mem, 0, ram);
 174
 175     /* Map the BIOS / boot exception handler. */
 176     memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios);
 177     /* Load a BIOS / boot exception handler image. */
 178     if (bios_name == NULL)
 179         bios_name = BIOS_FILENAME;
 180     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 181     if (filename) {
 182         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 183         g_free(filename);
 184     } else {
 185         bios_size = -1;
 186     }
 187     if ((bios_size < 0 || bios_size > BIOS_SIZE) &&
 188         !kernel_filename && !qtest_enabled()) {
 189         /* Bail out if we have neither a kernel image nor boot vector code. */
 190         error_report("Could not load MIPS bios '%s', and no "
 191                      "-kernel argument was specified", bios_name);
 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 = 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     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 211     memory_region_init_alias(isa, NULL, "isa_mmio",
 212                              get_system_io(), 0, 0x00010000);
 213     memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa);
 214
 215     /* A single 16450 sits at offset 0x3f8. It is attached to
 216        MIPS CPU INT2, which is interrupt 4. */
 217     if (serial_hd(0))
 218         serial_init(0x3f8, env->irq[4], 115200, serial_hd(0),
 219                     get_system_io());
 220
 221     if (nd_table[0].used)
 222         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 223         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 224 }
 225
 226 static void mips_mipssim_machine_init(MachineClass *mc)
 227 {
 228     mc->desc = "MIPS MIPSsim platform";
 229     mc->init = mips_mipssim_init;
 230 #ifdef TARGET_MIPS64
 231     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("5Kf");
 232 #else
 233     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf");
 234 #endif
 235 }
 236
 237 DEFINE_MACHINE("mipssim", mips_mipssim_machine_init)