hw/mips/mips_r4k.c

   1 /*
   2  * QEMU/MIPS pseudo-board
   3  *
   4  * emulates a simple machine with ISA-like bus.
   5  * ISA IO space mapped to the 0x14000000 (PHYS) and
   6  * ISA memory at the 0x10000000 (PHYS, 16Mb in size).
   7  * All peripherial devices are attached to this "bus" with
   8  * the standard PC ISA addresses.
   9 */
  10 #include "qemu/osdep.h"
  11 #include "qapi/error.h"
  12 #include "qemu-common.h"
  13 #include "cpu.h"
  14 #include "hw/hw.h"
  15 #include "hw/mips/mips.h"
  16 #include "hw/mips/cpudevs.h"
  17 #include "hw/i386/pc.h"
  18 #include "hw/char/serial.h"
  19 #include "hw/isa/isa.h"
  20 #include "net/net.h"
  21 #include "hw/net/ne2000-isa.h"
  22 #include "sysemu/sysemu.h"
  23 #include "hw/boards.h"
  24 #include "hw/block/flash.h"
  25 #include "qemu/log.h"
  26 #include "hw/mips/bios.h"
  27 #include "hw/ide.h"
  28 #include "hw/loader.h"
  29 #include "elf.h"
  30 #include "hw/timer/mc146818rtc.h"
  31 #include "hw/timer/i8254.h"
  32 #include "sysemu/block-backend.h"
  33 #include "exec/address-spaces.h"
  34 #include "sysemu/qtest.h"
  35 #include "qemu/error-report.h"
  36
  37 #define MAX_IDE_BUS 2
  38
  39 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  40 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  41 static const int ide_irq[2] = { 14, 15 };
  42
  43 static ISADevice *pit; /* PIT i8254 */
  44
  45 static bool bigendian;
  46
  47 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  48
  49 static struct _loaderparams {
  50     int ram_size;
  51     const char *kernel_filename;
  52     const char *kernel_cmdline;
  53     const char *initrd_filename;
  54 } loaderparams;
  55
  56 static void mips_qemu_write (void *opaque, hwaddr addr,
  57                              uint64_t val, unsigned size)
  58 {
  59     if ((addr & 0xffff) == 0 && val == 42)
  60         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  61     else if ((addr & 0xffff) == 4 && val == 42)
  62         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  63 }
  64
  65 static uint64_t mips_qemu_read (void *opaque, hwaddr addr,
  66                                 unsigned size)
  67 {
  68     return 0;
  69 }
  70
  71 static const MemoryRegionOps mips_qemu_ops = {
  72     .read = mips_qemu_read,
  73     .write = mips_qemu_write,
  74     .endianness = DEVICE_NATIVE_ENDIAN,
  75 };
  76
  77 typedef struct ResetData {
  78     MIPSCPU *cpu;
  79     uint64_t vector;
  80 } ResetData;
  81
  82 static int64_t load_kernel(void)
  83 {
  84     int64_t entry, kernel_high;
  85     long kernel_size, initrd_size, params_size;
  86     ram_addr_t initrd_offset;
  87     uint32_t *params_buf;
  88     int big_endian;
  89
  90 #ifdef TARGET_WORDS_BIGENDIAN
  91     big_endian = 1;
  92 #else
  93     big_endian = 0;
  94 #endif
  95     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
  96                            NULL, (uint64_t *)&entry, NULL,
  97                            (uint64_t *)&kernel_high, big_endian,
  98                            EM_MIPS, 1, 0);
  99     if (kernel_size >= 0) {
 100         if ((entry & ~0x7fffffffULL) == 0x80000000)
 101             entry = (int32_t)entry;
 102     } else {
 103         error_report("qemu: could not load kernel '%s': %s",
 104                      loaderparams.kernel_filename,
 105                      load_elf_strerror(kernel_size));
 106         exit(1);
 107     }
 108
 109     /* Set SP (needed for some kernels) - normally set by bootloader. */
 110     //~ env->active_tc.gpr[29] = (entry + (kernel_size & 0xfffffffc)) + 0x1000;
 111
 112     /* load initrd */
 113     initrd_size = 0;
 114     initrd_offset = 0;
 115     if (loaderparams.initrd_filename) {
 116         initrd_size = get_image_size (loaderparams.initrd_filename);
 117         if (initrd_size > 0) {
 118             initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
 119             if (initrd_offset + initrd_size > ram_size) {
 120                 fprintf(stderr,
 121                         "qemu: memory too small for initial ram disk '%s'\n",
 122                         loaderparams.initrd_filename);
 123                 exit(1);
 124             }
 125             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 126                                               initrd_offset,
 127                                               ram_size - initrd_offset);
 128         }
 129         if (initrd_size == (target_ulong) -1) {
 130             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 131                     loaderparams.initrd_filename);
 132             exit(1);
 133         }
 134     }
 135
 136     /* Store command line.  */
 137     params_size = 264;
 138     params_buf = g_malloc(params_size);
 139
 140     params_buf[0] = tswap32(ram_size);
 141     params_buf[1] = tswap32(0x12345678);
 142
 143     if (initrd_size > 0) {
 144         snprintf((char *)params_buf + 8, 256, "rd_start=0x%" PRIx64 " rd_size=%li %s",
 145                  cpu_mips_phys_to_kseg0(NULL, initrd_offset),
 146                  initrd_size, loaderparams.kernel_cmdline);
 147     } else {
 148         snprintf((char *)params_buf + 8, 256, "%s", loaderparams.kernel_cmdline);
 149     }
 150
 151     rom_add_blob_fixed("params", params_buf, params_size,
 152                        (16 << 20) - 264);
 153
 154     g_free(params_buf);
 155     return entry;
 156 }
 157
 158 static void main_cpu_reset(void *opaque)
 159 {
 160     ResetData *s = (ResetData *)opaque;
 161     CPUMIPSState *env = &s->cpu->env;
 162
 163     cpu_reset(CPU(s->cpu));
 164     env->active_tc.PC = s->vector;
 165 }
 166
 167 static const int sector_len = 32 * 1024;
 168
 169 static
 170 void mips_init(MachineState *machine)
 171 {
 172     ram_addr_t ram_size = machine->ram_size;
 173     const char *kernel_filename = machine->kernel_filename;
 174     const char *kernel_cmdline = machine->kernel_cmdline;
 175     const char *initrd_filename = machine->initrd_filename;
 176     char *filename;
 177     MemoryRegion *address_space_mem = get_system_memory();
 178     MemoryRegion *ram = g_new(MemoryRegion, 1);
 179     MemoryRegion *bios;
 180     MemoryRegion *iomem = g_new(MemoryRegion, 1);
 181     MemoryRegion *isa_io = g_new(MemoryRegion, 1);
 182     MemoryRegion *isa_mem = g_new(MemoryRegion, 1);
 183     int bios_size;
 184     MIPSCPU *cpu;
 185     CPUMIPSState *env;
 186     ResetData *reset_info;
 187     int i;
 188     qemu_irq *i8259;
 189     ISABus *isa_bus;
 190     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 191     DriveInfo *dinfo;
 192
 193     /* init CPUs */
 194     cpu = MIPS_CPU(cpu_create(machine->cpu_type));
 195     env = &cpu->env;
 196
 197     reset_info = g_malloc0(sizeof(ResetData));
 198     reset_info->cpu = cpu;
 199     reset_info->vector = env->active_tc.PC;
 200     qemu_register_reset(main_cpu_reset, reset_info);
 201
 202     /* allocate RAM */
 203     if (ram_size > (256 << 20)) {
 204         fprintf(stderr,
 205                 "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
 206                 ((unsigned int)ram_size / (1 << 20)));
 207         exit(1);
 208     }
 209     memory_region_allocate_system_memory(ram, NULL, "mips_r4k.ram", ram_size);
 210
 211     memory_region_add_subregion(address_space_mem, 0, ram);
 212
 213     memory_region_init_io(iomem, NULL, &mips_qemu_ops, NULL, "mips-qemu", 0x10000);
 214     memory_region_add_subregion(address_space_mem, 0x1fbf0000, iomem);
 215
 216     /* Try to load a BIOS image. If this fails, we continue regardless,
 217        but initialize the hardware ourselves. When a kernel gets
 218        preloaded we also initialize the hardware, since the BIOS wasn't
 219        run. */
 220     if (bios_name == NULL)
 221         bios_name = BIOS_FILENAME;
 222     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 223     if (filename) {
 224         bios_size = get_image_size(filename);
 225     } else {
 226         bios_size = -1;
 227     }
 228     g_assert(ENV_GET_CPU(env)->bigendian == bigendian);
 229     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 230         bios = g_new(MemoryRegion, 1);
 231         memory_region_init_ram(bios, NULL, "mips_r4k.bios", BIOS_SIZE,
 232                                &error_fatal);
 233         memory_region_set_readonly(bios, true);
 234         memory_region_add_subregion(get_system_memory(), 0x1fc00000, bios);
 235
 236         load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
 237     } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
 238         uint32_t mips_rom = 0x00400000;
 239         if (!pflash_cfi01_register(0x1fc00000, NULL, "mips_r4k.bios", mips_rom,
 240                                    blk_by_legacy_dinfo(dinfo),
 241                                    sector_len, mips_rom / sector_len,
 242                                    4, 0, 0, 0, 0, bigendian)) {
 243             fprintf(stderr, "qemu: Error registering flash memory.\n");
 244         }
 245     } else if (!qtest_enabled()) {
 246         /* not fatal */
 247         warn_report("could not load MIPS bios '%s'", bios_name);
 248     }
 249     g_free(filename);
 250
 251     if (kernel_filename) {
 252         loaderparams.ram_size = ram_size;
 253         loaderparams.kernel_filename = kernel_filename;
 254         loaderparams.kernel_cmdline = kernel_cmdline;
 255         loaderparams.initrd_filename = initrd_filename;
 256         reset_info->vector = load_kernel();
 257     }
 258
 259     /* Init CPU internal devices */
 260     cpu_mips_irq_init_cpu(cpu);
 261     cpu_mips_clock_init(cpu);
 262
 263     /* ISA bus: IO space at 0x14000000, mem space at 0x10000000 */
 264     memory_region_init_alias(isa_io, NULL, "isa-io",
 265                              get_system_io(), 0, 0x00010000);
 266     memory_region_init(isa_mem, NULL, "isa-mem", 0x01000000);
 267     memory_region_add_subregion(get_system_memory(), 0x14000000, isa_io);
 268     memory_region_add_subregion(get_system_memory(), 0x10000000, isa_mem);
 269     isa_bus = isa_bus_new(NULL, isa_mem, get_system_io(), &error_abort);
 270
 271     /* The PIC is attached to the MIPS CPU INT0 pin */
 272     i8259 = i8259_init(isa_bus, env->irq[2]);
 273     isa_bus_irqs(isa_bus, i8259);
 274
 275     mc146818_rtc_init(isa_bus, 2000, NULL);
 276
 277     pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
 278
 279     serial_hds_isa_init(isa_bus, 0, MAX_SERIAL_PORTS);
 280
 281     isa_vga_init(isa_bus);
 282
 283     if (nd_table[0].used)
 284         isa_ne2000_init(isa_bus, 0x300, 9, &nd_table[0]);
 285
 286     ide_drive_get(hd, ARRAY_SIZE(hd));
 287     for(i = 0; i < MAX_IDE_BUS; i++)
 288         isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], ide_irq[i],
 289                      hd[MAX_IDE_DEVS * i],
 290                      hd[MAX_IDE_DEVS * i + 1]);
 291
 292     isa_create_simple(isa_bus, "i8042");
 293 }
 294
 295 static
 296 void mips_r4k_init(MachineState *machine)
 297 {
 298     /* Run MIPS system in standard endian mode. */
 299 #if defined(TARGET_WORDS_BIGENDIAN)
 300     bigendian = true;
 301 #else
 302     bigendian = false;
 303 #endif
 304     mips_init(machine);
 305 }
 306
 307 static
 308 void mipsel_r4k_init(MachineState *machine)
 309 {
 310     /* Run MIPS system in little endian mode. */
 311     bigendian = false;
 312     mips_init(machine);
 313 }
 314
 315 static void mips_machine_init(MachineClass *mc)
 316 {
 317     mc->desc = "mips r4k platform";
 318     mc->init = mips_r4k_init;
 319     mc->block_default_type = IF_IDE;
 320 #ifdef TARGET_MIPS64
 321     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("R4000");
 322 #else
 323     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf");
 324 #endif
 325
 326 }
 327
 328 DEFINE_MACHINE("mips", mips_machine_init)
 329
 330 static void mipsel_machine_init(MachineClass *mc)
 331 {
 332     mc->desc = "misp r4k platform (little endian)";
 333     mc->init = mipsel_r4k_init;
 334 };
 335
 336 DEFINE_MACHINE("mipsel", mipsel_machine_init)