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