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