hw/ppc_prep.c

   1 /*
   2  * QEMU PPC PREP hardware System Emulator
   3  *
   4  * Copyright (c) 2003-2004 Jocelyn Mayer
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "vl.h"
  25
  26 //#define HARD_DEBUG_PPC_IO
  27 //#define DEBUG_PPC_IO
  28
  29 #define BIOS_FILENAME "ppc_rom.bin"
  30 #define KERNEL_LOAD_ADDR 0x01000000
  31 #define INITRD_LOAD_ADDR 0x01800000
  32
  33 extern int loglevel;
  34 extern FILE *logfile;
  35
  36 #if defined (HARD_DEBUG_PPC_IO) && !defined (DEBUG_PPC_IO)
  37 #define DEBUG_PPC_IO
  38 #endif
  39
  40 #if defined (HARD_DEBUG_PPC_IO)
  41 #define PPC_IO_DPRINTF(fmt, args...)                     \
  42 do {                                                     \
  43     if (loglevel & CPU_LOG_IOPORT) {                     \
  44         fprintf(logfile, "%s: " fmt, __func__ , ##args); \
  45     } else {                                             \
  46         printf("%s : " fmt, __func__ , ##args);          \
  47     }                                                    \
  48 } while (0)
  49 #elif defined (DEBUG_PPC_IO)
  50 #define PPC_IO_DPRINTF(fmt, args...)                     \
  51 do {                                                     \
  52     if (loglevel & CPU_LOG_IOPORT) {                     \
  53         fprintf(logfile, "%s: " fmt, __func__ , ##args); \
  54     }                                                    \
  55 } while (0)
  56 #else
  57 #define PPC_IO_DPRINTF(fmt, args...) do { } while (0)
  58 #endif
  59
  60 /* Constants for devices init */
  61 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  62 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  63 static const int ide_irq[2] = { 13, 13 };
  64
  65 #define NE2000_NB_MAX 6
  66
  67 static uint32_t ne2000_io[NE2000_NB_MAX] = { 0x300, 0x320, 0x340, 0x360, 0x280, 0x380 };
  68 static int ne2000_irq[NE2000_NB_MAX] = { 9, 10, 11, 3, 4, 5 };
  69
  70 //static PITState *pit;
  71
  72 /* ISA IO ports bridge */
  73 #define PPC_IO_BASE 0x80000000
  74
  75 /* Speaker port 0x61 */
  76 int speaker_data_on;
  77 int dummy_refresh_clock;
  78
  79 static void speaker_ioport_write(void *opaque, uint32_t addr, uint32_t val)
  80 {
  81 #if 0
  82     speaker_data_on = (val >> 1) & 1;
  83     pit_set_gate(pit, 2, val & 1);
  84 #endif
  85 }
  86
  87 static uint32_t speaker_ioport_read(void *opaque, uint32_t addr)
  88 {
  89 #if 0
  90     int out;
  91     out = pit_get_out(pit, 2, qemu_get_clock(vm_clock));
  92     dummy_refresh_clock ^= 1;
  93     return (speaker_data_on << 1) | pit_get_gate(pit, 2) | (out << 5) |
  94       (dummy_refresh_clock << 4);
  95 #endif
  96     return 0;
  97 }
  98
  99 static void pic_irq_request(void *opaque, int level)
 100 {
 101     if (level)
 102         cpu_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
 103     else
 104         cpu_reset_interrupt(cpu_single_env, CPU_INTERRUPT_HARD);
 105 }
 106
 107 /* PCI intack register */
 108 /* Read-only register (?) */
 109 static void _PPC_intack_write (void *opaque, target_phys_addr_t addr, uint32_t value)
 110 {
 111     //    printf("%s: 0x%08x => 0x%08x\n", __func__, addr, value);
 112 }
 113
 114 static inline uint32_t _PPC_intack_read (target_phys_addr_t addr)
 115 {
 116     uint32_t retval = 0;
 117
 118     if (addr == 0xBFFFFFF0)
 119         retval = pic_intack_read(isa_pic);
 120        //   printf("%s: 0x%08x <= %d\n", __func__, addr, retval);
 121
 122     return retval;
 123 }
 124
 125 static uint32_t PPC_intack_readb (void *opaque, target_phys_addr_t addr)
 126 {
 127     return _PPC_intack_read(addr);
 128 }
 129
 130 static uint32_t PPC_intack_readw (void *opaque, target_phys_addr_t addr)
 131 {
 132 #ifdef TARGET_WORDS_BIGENDIAN
 133     return bswap16(_PPC_intack_read(addr));
 134 #else
 135     return _PPC_intack_read(addr);
 136 #endif
 137 }
 138
 139 static uint32_t PPC_intack_readl (void *opaque, target_phys_addr_t addr)
 140 {
 141 #ifdef TARGET_WORDS_BIGENDIAN
 142     return bswap32(_PPC_intack_read(addr));
 143 #else
 144     return _PPC_intack_read(addr);
 145 #endif
 146 }
 147
 148 static CPUWriteMemoryFunc *PPC_intack_write[] = {
 149     &_PPC_intack_write,
 150     &_PPC_intack_write,
 151     &_PPC_intack_write,
 152 };
 153
 154 static CPUReadMemoryFunc *PPC_intack_read[] = {
 155     &PPC_intack_readb,
 156     &PPC_intack_readw,
 157     &PPC_intack_readl,
 158 };
 159
 160 /* PowerPC control and status registers */
 161 #if 0 // Not used
 162 static struct {
 163     /* IDs */
 164     uint32_t veni_devi;
 165     uint32_t revi;
 166     /* Control and status */
 167     uint32_t gcsr;
 168     uint32_t xcfr;
 169     uint32_t ct32;
 170     uint32_t mcsr;
 171     /* General purpose registers */
 172     uint32_t gprg[6];
 173     /* Exceptions */
 174     uint32_t feen;
 175     uint32_t fest;
 176     uint32_t fema;
 177     uint32_t fecl;
 178     uint32_t eeen;
 179     uint32_t eest;
 180     uint32_t eecl;
 181     uint32_t eeint;
 182     uint32_t eemck0;
 183     uint32_t eemck1;
 184     /* Error diagnostic */
 185 } XCSR;
 186
 187 static void PPC_XCSR_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
 188 {
 189     printf("%s: 0x%08lx => 0x%08x\n", __func__, (long)addr, value);
 190 }
 191
 192 static void PPC_XCSR_writew (void *opaque, target_phys_addr_t addr, uint32_t value)
 193 {
 194 #ifdef TARGET_WORDS_BIGENDIAN
 195     value = bswap16(value);
 196 #endif
 197     printf("%s: 0x%08lx => 0x%08x\n", __func__, (long)addr, value);
 198 }
 199
 200 static void PPC_XCSR_writel (void *opaque, target_phys_addr_t addr, uint32_t value)
 201 {
 202 #ifdef TARGET_WORDS_BIGENDIAN
 203     value = bswap32(value);
 204 #endif
 205     printf("%s: 0x%08lx => 0x%08x\n", __func__, (long)addr, value);
 206 }
 207
 208 static uint32_t PPC_XCSR_readb (void *opaque, target_phys_addr_t addr)
 209 {
 210     uint32_t retval = 0;
 211
 212     printf("%s: 0x%08lx <= %d\n", __func__, (long)addr, retval);
 213
 214     return retval;
 215 }
 216
 217 static uint32_t PPC_XCSR_readw (void *opaque, target_phys_addr_t addr)
 218 {
 219     uint32_t retval = 0;
 220
 221     printf("%s: 0x%08lx <= %d\n", __func__, (long)addr, retval);
 222 #ifdef TARGET_WORDS_BIGENDIAN
 223     retval = bswap16(retval);
 224 #endif
 225
 226     return retval;
 227 }
 228
 229 static uint32_t PPC_XCSR_readl (void *opaque, target_phys_addr_t addr)
 230 {
 231     uint32_t retval = 0;
 232
 233     printf("%s: 0x%08lx <= %d\n", __func__, (long)addr, retval);
 234 #ifdef TARGET_WORDS_BIGENDIAN
 235     retval = bswap32(retval);
 236 #endif
 237
 238     return retval;
 239 }
 240
 241 static CPUWriteMemoryFunc *PPC_XCSR_write[] = {
 242     &PPC_XCSR_writeb,
 243     &PPC_XCSR_writew,
 244     &PPC_XCSR_writel,
 245 };
 246
 247 static CPUReadMemoryFunc *PPC_XCSR_read[] = {
 248     &PPC_XCSR_readb,
 249     &PPC_XCSR_readw,
 250     &PPC_XCSR_readl,
 251 };
 252 #endif
 253
 254 /* Fake super-io ports for PREP platform (Intel 82378ZB) */
 255 typedef struct sysctrl_t {
 256     m48t59_t *nvram;
 257     uint8_t state;
 258     uint8_t syscontrol;
 259     uint8_t fake_io[2];
 260     int contiguous_map;
 261 } sysctrl_t;
 262
 263 enum {
 264     STATE_HARDFILE = 0x01,
 265 };
 266
 267 static sysctrl_t *sysctrl;
 268
 269 static void PREP_io_write (void *opaque, uint32_t addr, uint32_t val)
 270 {
 271     sysctrl_t *sysctrl = opaque;
 272
 273     PPC_IO_DPRINTF("0x%08lx => 0x%08x\n", (long)addr - PPC_IO_BASE, val);
 274     sysctrl->fake_io[addr - 0x0398] = val;
 275 }
 276
 277 static uint32_t PREP_io_read (void *opaque, uint32_t addr)
 278 {
 279     sysctrl_t *sysctrl = opaque;
 280
 281     PPC_IO_DPRINTF("0x%08lx <= 0x%08x\n", (long)addr - PPC_IO_BASE,
 282                    sysctrl->fake_io[addr - 0x0398]);
 283     return sysctrl->fake_io[addr - 0x0398];
 284 }
 285
 286 static void PREP_io_800_writeb (void *opaque, uint32_t addr, uint32_t val)
 287 {
 288     sysctrl_t *sysctrl = opaque;
 289
 290     PPC_IO_DPRINTF("0x%08lx => 0x%08x\n", (long)addr - PPC_IO_BASE, val);
 291     switch (addr) {
 292     case 0x0092:
 293         /* Special port 92 */
 294         /* Check soft reset asked */
 295         if (val & 0x01) {
 296             //            cpu_interrupt(cpu_single_env, CPU_INTERRUPT_RESET);
 297         }
 298         /* Check LE mode */
 299         if (val & 0x02) {
 300             printf("Little Endian mode isn't supported (yet ?)\n");
 301             abort();
 302         }
 303         break;
 304     case 0x0800:
 305         /* Motorola CPU configuration register : read-only */
 306         break;
 307     case 0x0802:
 308         /* Motorola base module feature register : read-only */
 309         break;
 310     case 0x0803:
 311         /* Motorola base module status register : read-only */
 312         break;
 313     case 0x0808:
 314         /* Hardfile light register */
 315         if (val & 1)
 316             sysctrl->state |= STATE_HARDFILE;
 317         else
 318             sysctrl->state &= ~STATE_HARDFILE;
 319         break;
 320     case 0x0810:
 321         /* Password protect 1 register */
 322         if (sysctrl->nvram != NULL)
 323             m48t59_toggle_lock(sysctrl->nvram, 1);
 324         break;
 325     case 0x0812:
 326         /* Password protect 2 register */
 327         if (sysctrl->nvram != NULL)
 328             m48t59_toggle_lock(sysctrl->nvram, 2);
 329         break;
 330     case 0x0814:
 331         /* L2 invalidate register */
 332         //        tlb_flush(cpu_single_env, 1);
 333         break;
 334     case 0x081C:
 335         /* system control register */
 336         sysctrl->syscontrol = val & 0x0F;
 337         break;
 338     case 0x0850:
 339         /* I/O map type register */
 340         sysctrl->contiguous_map = val & 0x01;
 341         break;
 342     default:
 343         printf("ERROR: unaffected IO port write: %04lx => %02x\n",
 344                (long)addr, val);
 345         break;
 346     }
 347 }
 348
 349 static uint32_t PREP_io_800_readb (void *opaque, uint32_t addr)
 350 {
 351     sysctrl_t *sysctrl = opaque;
 352     uint32_t retval = 0xFF;
 353
 354     switch (addr) {
 355     case 0x0092:
 356         /* Special port 92 */
 357         retval = 0x00;
 358         break;
 359     case 0x0800:
 360         /* Motorola CPU configuration register */
 361         retval = 0xEF; /* MPC750 */
 362         break;
 363     case 0x0802:
 364         /* Motorola Base module feature register */
 365         retval = 0xAD; /* No ESCC, PMC slot neither ethernet */
 366         break;
 367     case 0x0803:
 368         /* Motorola base module status register */
 369         retval = 0xE0; /* Standard MPC750 */
 370         break;
 371     case 0x080C:
 372         /* Equipment present register:
 373          *  no L2 cache
 374          *  no upgrade processor
 375          *  no cards in PCI slots
 376          *  SCSI fuse is bad
 377          */
 378         retval = 0x3C;
 379         break;
 380     case 0x0810:
 381         /* Motorola base module extended feature register */
 382         retval = 0x39; /* No USB, CF and PCI bridge. NVRAM present */
 383         break;
 384     case 0x0814:
 385         /* L2 invalidate: don't care */
 386         break;
 387     case 0x0818:
 388         /* Keylock */
 389         retval = 0x00;
 390         break;
 391     case 0x081C:
 392         /* system control register
 393          * 7 - 6 / 1 - 0: L2 cache enable
 394          */
 395         retval = sysctrl->syscontrol;
 396         break;
 397     case 0x0823:
 398         /* */
 399         retval = 0x03; /* no L2 cache */
 400         break;
 401     case 0x0850:
 402         /* I/O map type register */
 403         retval = sysctrl->contiguous_map;
 404         break;
 405     default:
 406         printf("ERROR: unaffected IO port: %04lx read\n", (long)addr);
 407         break;
 408     }
 409     PPC_IO_DPRINTF("0x%08lx <= 0x%08x\n", (long)addr - PPC_IO_BASE, retval);
 410
 411     return retval;
 412 }
 413
 414 static inline target_phys_addr_t prep_IO_address (sysctrl_t *sysctrl,
 415                                                   target_phys_addr_t addr)
 416 {
 417     if (sysctrl->contiguous_map == 0) {
 418         /* 64 KB contiguous space for IOs */
 419         addr &= 0xFFFF;
 420     } else {
 421         /* 8 MB non-contiguous space for IOs */
 422         addr = (addr & 0x1F) | ((addr & 0x007FFF000) >> 7);
 423     }
 424
 425     return addr;
 426 }
 427
 428 static void PPC_prep_io_writeb (void *opaque, target_phys_addr_t addr,
 429                                 uint32_t value)
 430 {
 431     sysctrl_t *sysctrl = opaque;
 432
 433     addr = prep_IO_address(sysctrl, addr);
 434     cpu_outb(NULL, addr, value);
 435 }
 436
 437 static uint32_t PPC_prep_io_readb (void *opaque, target_phys_addr_t addr)
 438 {
 439     sysctrl_t *sysctrl = opaque;
 440     uint32_t ret;
 441
 442     addr = prep_IO_address(sysctrl, addr);
 443     ret = cpu_inb(NULL, addr);
 444
 445     return ret;
 446 }
 447
 448 static void PPC_prep_io_writew (void *opaque, target_phys_addr_t addr,
 449                                 uint32_t value)
 450 {
 451     sysctrl_t *sysctrl = opaque;
 452
 453     addr = prep_IO_address(sysctrl, addr);
 454 #ifdef TARGET_WORDS_BIGENDIAN
 455     value = bswap16(value);
 456 #endif
 457     PPC_IO_DPRINTF("0x%08lx => 0x%08x\n", (long)addr, value);
 458     cpu_outw(NULL, addr, value);
 459 }
 460
 461 static uint32_t PPC_prep_io_readw (void *opaque, target_phys_addr_t addr)
 462 {
 463     sysctrl_t *sysctrl = opaque;
 464     uint32_t ret;
 465
 466     addr = prep_IO_address(sysctrl, addr);
 467     ret = cpu_inw(NULL, addr);
 468 #ifdef TARGET_WORDS_BIGENDIAN
 469     ret = bswap16(ret);
 470 #endif
 471     PPC_IO_DPRINTF("0x%08lx <= 0x%08x\n", (long)addr, ret);
 472
 473     return ret;
 474 }
 475
 476 static void PPC_prep_io_writel (void *opaque, target_phys_addr_t addr,
 477                                 uint32_t value)
 478 {
 479     sysctrl_t *sysctrl = opaque;
 480
 481     addr = prep_IO_address(sysctrl, addr);
 482 #ifdef TARGET_WORDS_BIGENDIAN
 483     value = bswap32(value);
 484 #endif
 485     PPC_IO_DPRINTF("0x%08lx => 0x%08x\n", (long)addr, value);
 486     cpu_outl(NULL, addr, value);
 487 }
 488
 489 static uint32_t PPC_prep_io_readl (void *opaque, target_phys_addr_t addr)
 490 {
 491     sysctrl_t *sysctrl = opaque;
 492     uint32_t ret;
 493
 494     addr = prep_IO_address(sysctrl, addr);
 495     ret = cpu_inl(NULL, addr);
 496 #ifdef TARGET_WORDS_BIGENDIAN
 497     ret = bswap32(ret);
 498 #endif
 499     PPC_IO_DPRINTF("0x%08lx <= 0x%08x\n", (long)addr, ret);
 500
 501     return ret;
 502 }
 503
 504 CPUWriteMemoryFunc *PPC_prep_io_write[] = {
 505     &PPC_prep_io_writeb,
 506     &PPC_prep_io_writew,
 507     &PPC_prep_io_writel,
 508 };
 509
 510 CPUReadMemoryFunc *PPC_prep_io_read[] = {
 511     &PPC_prep_io_readb,
 512     &PPC_prep_io_readw,
 513     &PPC_prep_io_readl,
 514 };
 515
 516 #define NVRAM_SIZE        0x2000
 517
 518 /* PowerPC PREP hardware initialisation */
 519 static void ppc_prep_init(int ram_size, int vga_ram_size, int boot_device,
 520                           DisplayState *ds, const char **fd_filename, int snapshot,
 521                           const char *kernel_filename, const char *kernel_cmdline,
 522                           const char *initrd_filename)
 523 {
 524     char buf[1024];
 525     m48t59_t *nvram;
 526     int PPC_io_memory;
 527     int ret, linux_boot, i, nb_nics1;
 528     unsigned long bios_offset;
 529     uint32_t kernel_base, kernel_size, initrd_base, initrd_size;
 530     ppc_def_t *def;
 531     PCIBus *pci_bus;
 532
 533     sysctrl = qemu_mallocz(sizeof(sysctrl_t));
 534     if (sysctrl == NULL)
 535         return;
 536
 537     linux_boot = (kernel_filename != NULL);
 538
 539     /* allocate RAM */
 540     cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
 541
 542     /* allocate and load BIOS */
 543     bios_offset = ram_size + vga_ram_size;
 544     snprintf(buf, sizeof(buf), "%s/%s", bios_dir, BIOS_FILENAME);
 545     ret = load_image(buf, phys_ram_base + bios_offset);
 546     if (ret != BIOS_SIZE) {
 547         fprintf(stderr, "qemu: could not load PPC PREP bios '%s'\n", buf);
 548         exit(1);
 549     }
 550     cpu_register_physical_memory((uint32_t)(-BIOS_SIZE),
 551                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 552     cpu_single_env->nip = 0xfffffffc;
 553
 554     if (linux_boot) {
 555         kernel_base = KERNEL_LOAD_ADDR;
 556         /* now we can load the kernel */
 557         kernel_size = load_image(kernel_filename, phys_ram_base + kernel_base);
 558         if (kernel_size < 0) {
 559             fprintf(stderr, "qemu: could not load kernel '%s'\n",
 560                     kernel_filename);
 561             exit(1);
 562         }
 563         /* load initrd */
 564         if (initrd_filename) {
 565             initrd_base = INITRD_LOAD_ADDR;
 566             initrd_size = load_image(initrd_filename,
 567                                      phys_ram_base + initrd_base);
 568             if (initrd_size < 0) {
 569                 fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 570                         initrd_filename);
 571                 exit(1);
 572             }
 573         } else {
 574             initrd_base = 0;
 575             initrd_size = 0;
 576         }
 577         boot_device = 'm';
 578     } else {
 579         kernel_base = 0;
 580         kernel_size = 0;
 581         initrd_base = 0;
 582         initrd_size = 0;
 583     }
 584
 585     /* Register CPU as a 604 */
 586     /* XXX: CPU model (or PVR) should be provided on command line */
 587     //    ppc_find_by_name("604r", &def);
 588     //    ppc_find_by_name("604e", &def);
 589     ppc_find_by_name("604", &def);
 590     if (def == NULL) {
 591         cpu_abort(cpu_single_env, "Unable to find PowerPC CPU definition\n");
 592     }
 593     cpu_ppc_register(cpu_single_env, def);
 594     /* Set time-base frequency to 100 Mhz */
 595     cpu_ppc_tb_init(cpu_single_env, 100UL * 1000UL * 1000UL);
 596
 597     isa_mem_base = 0xc0000000;
 598     pci_bus = pci_prep_init();
 599     //    pci_bus = i440fx_init();
 600     /* Register 8 MB of ISA IO space (needed for non-contiguous map) */
 601     PPC_io_memory = cpu_register_io_memory(0, PPC_prep_io_read,
 602                                            PPC_prep_io_write, sysctrl);
 603     cpu_register_physical_memory(0x80000000, 0x00800000, PPC_io_memory);
 604
 605     /* init basic PC hardware */
 606     vga_initialize(pci_bus, ds, phys_ram_base + ram_size, ram_size,
 607                    vga_ram_size);
 608     rtc_init(0x70, 8);
 609     //    openpic = openpic_init(0x00000000, 0xF0000000, 1);
 610     isa_pic = pic_init(pic_irq_request, cpu_single_env);
 611     //    pit = pit_init(0x40, 0);
 612
 613     serial_init(0x3f8, 4, serial_hds[0]);
 614     nb_nics1 = nb_nics;
 615     if (nb_nics1 > NE2000_NB_MAX)
 616         nb_nics1 = NE2000_NB_MAX;
 617     for(i = 0; i < nb_nics1; i++) {
 618         isa_ne2000_init(ne2000_io[i], ne2000_irq[i], &nd_table[i]);
 619     }
 620
 621     for(i = 0; i < 2; i++) {
 622         isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
 623                      bs_table[2 * i], bs_table[2 * i + 1]);
 624     }
 625     kbd_init();
 626     DMA_init(1);
 627     //    AUD_init();
 628     //    SB16_init();
 629
 630     fdctrl_init(6, 2, 0, 0x3f0, fd_table);
 631
 632     /* Register speaker port */
 633     register_ioport_read(0x61, 1, 1, speaker_ioport_read, NULL);
 634     register_ioport_write(0x61, 1, 1, speaker_ioport_write, NULL);
 635     /* Register fake IO ports for PREP */
 636     register_ioport_read(0x398, 2, 1, &PREP_io_read, sysctrl);
 637     register_ioport_write(0x398, 2, 1, &PREP_io_write, sysctrl);
 638     /* System control ports */
 639     register_ioport_read(0x0092, 0x01, 1, &PREP_io_800_readb, sysctrl);
 640     register_ioport_write(0x0092, 0x01, 1, &PREP_io_800_writeb, sysctrl);
 641     register_ioport_read(0x0800, 0x52, 1, &PREP_io_800_readb, sysctrl);
 642     register_ioport_write(0x0800, 0x52, 1, &PREP_io_800_writeb, sysctrl);
 643     /* PCI intack location */
 644     PPC_io_memory = cpu_register_io_memory(0, PPC_intack_read,
 645                                            PPC_intack_write, NULL);
 646     cpu_register_physical_memory(0xBFFFFFF0, 0x4, PPC_io_memory);
 647     /* PowerPC control and status register group */
 648 #if 0
 649     PPC_io_memory = cpu_register_io_memory(0, PPC_XCSR_read, PPC_XCSR_write, NULL);
 650     cpu_register_physical_memory(0xFEFF0000, 0x1000, PPC_io_memory);
 651 #endif
 652
 653     nvram = m48t59_init(8, 0, 0x0074, NVRAM_SIZE);
 654     if (nvram == NULL)
 655         return;
 656     sysctrl->nvram = nvram;
 657
 658     /* Initialise NVRAM */
 659     PPC_NVRAM_set_params(nvram, NVRAM_SIZE, "PREP", ram_size, boot_device,
 660                          kernel_base, kernel_size,
 661                          kernel_cmdline,
 662                          initrd_base, initrd_size,
 663                          /* XXX: need an option to load a NVRAM image */
 664                          0,
 665                          graphic_width, graphic_height, graphic_depth);
 666
 667     /* Special port to get debug messages from Open-Firmware */
 668     register_ioport_write(0x0F00, 4, 1, &PPC_debug_write, NULL);
 669 }
 670
 671 QEMUMachine prep_machine = {
 672     "prep",
 673     "PowerPC PREP platform",
 674     ppc_prep_init,
 675 };