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