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/input/i8042.h"
  32 #include "hw/timer/i8254.h"
  33 #include "sysemu/block-backend.h"
  34 #include "exec/address-spaces.h"
  35 #include "sysemu/qtest.h"
  36 #include "qemu/error-report.h"
  37
  38 #define MAX_IDE_BUS 2
  39
  40 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  41 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  42 static const int ide_irq[2] = { 14, 15 };
  43
  44 static ISADevice *pit; /* PIT i8254 */
  45
  46 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  47
  48 static struct _loaderparams {
  49     int ram_size;
  50     const char *kernel_filename;
  51     const char *kernel_cmdline;
  52     const char *initrd_filename;
  53 } loaderparams;
  54
  55 static void mips_qemu_write (void *opaque, hwaddr addr,
  56                              uint64_t val, unsigned size)
  57 {
  58     if ((addr & 0xffff) == 0 && val == 42)
  59         qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
  60     else if ((addr & 0xffff) == 4 && val == 42)
  61         qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
  62 }
  63
  64 static uint64_t mips_qemu_read (void *opaque, hwaddr addr,
  65                                 unsigned size)
  66 {
  67     return 0;
  68 }
  69
  70 static const MemoryRegionOps mips_qemu_ops = {
  71     .read = mips_qemu_read,
  72     .write = mips_qemu_write,
  73     .endianness = DEVICE_NATIVE_ENDIAN,
  74 };
  75
  76 typedef struct ResetData {
  77     MIPSCPU *cpu;
  78     uint64_t vector;
  79 } ResetData;
  80
  81 static int64_t load_kernel(void)
  82 {
  83     int64_t entry, kernel_high;
  84     long kernel_size, initrd_size, params_size;
  85     ram_addr_t initrd_offset;
  86     uint32_t *params_buf;
  87     int big_endian;
  88
  89 #ifdef TARGET_WORDS_BIGENDIAN
  90     big_endian = 1;
  91 #else
  92     big_endian = 0;
  93 #endif
  94     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
  95                            NULL, (uint64_t *)&entry, NULL,
  96                            (uint64_t *)&kernel_high, big_endian,
  97                            EM_MIPS, 1, 0);
  98     if (kernel_size >= 0) {
  99         if ((entry & ~0x7fffffffULL) == 0x80000000)
 100             entry = (int32_t)entry;
 101     } else {
 102         error_report("could not load kernel '%s': %s",
 103                      loaderparams.kernel_filename,
 104                      load_elf_strerror(kernel_size));
 105         exit(1);
 106     }
 107
 108     /* load initrd */
 109     initrd_size = 0;
 110     initrd_offset = 0;
 111     if (loaderparams.initrd_filename) {
 112         initrd_size = get_image_size (loaderparams.initrd_filename);
 113         if (initrd_size > 0) {
 114             initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
 115             if (initrd_offset + initrd_size > ram_size) {
 116                 error_report("memory too small for initial ram disk '%s'",
 117                              loaderparams.initrd_filename);
 118                 exit(1);
 119             }
 120             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 121                                               initrd_offset,
 122                                               ram_size - initrd_offset);
 123         }
 124         if (initrd_size == (target_ulong) -1) {
 125             error_report("could not load initial ram disk '%s'",
 126                          loaderparams.initrd_filename);
 127             exit(1);
 128         }
 129     }
 130
 131     /* Store command line.  */
 132     params_size = 264;
 133     params_buf = g_malloc(params_size);
 134
 135     params_buf[0] = tswap32(ram_size);
 136     params_buf[1] = tswap32(0x12345678);
 137
 138     if (initrd_size > 0) {
 139         snprintf((char *)params_buf + 8, 256, "rd_start=0x%" PRIx64 " rd_size=%li %s",
 140                  cpu_mips_phys_to_kseg0(NULL, initrd_offset),
 141                  initrd_size, loaderparams.kernel_cmdline);
 142     } else {
 143         snprintf((char *)params_buf + 8, 256, "%s", loaderparams.kernel_cmdline);
 144     }
 145
 146     rom_add_blob_fixed("params", params_buf, params_size,
 147                        (16 << 20) - 264);
 148
 149     g_free(params_buf);
 150     return entry;
 151 }
 152
 153 static void main_cpu_reset(void *opaque)
 154 {
 155     ResetData *s = (ResetData *)opaque;
 156     CPUMIPSState *env = &s->cpu->env;
 157
 158     cpu_reset(CPU(s->cpu));
 159     env->active_tc.PC = s->vector;
 160 }
 161
 162 static const int sector_len = 32 * 1024;
 163 static
 164 void mips_r4k_init(MachineState *machine)
 165 {
 166     ram_addr_t ram_size = machine->ram_size;
 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     cpu = MIPS_CPU(cpu_create(machine->cpu_type));
 190     env = &cpu->env;
 191
 192     reset_info = g_malloc0(sizeof(ResetData));
 193     reset_info->cpu = cpu;
 194     reset_info->vector = env->active_tc.PC;
 195     qemu_register_reset(main_cpu_reset, reset_info);
 196
 197     /* allocate RAM */
 198     if (ram_size > (256 << 20)) {
 199         error_report("Too much memory for this machine: %dMB, maximum 256MB",
 200                      ((unsigned int)ram_size / (1 << 20)));
 201         exit(1);
 202     }
 203     memory_region_allocate_system_memory(ram, NULL, "mips_r4k.ram", ram_size);
 204
 205     memory_region_add_subregion(address_space_mem, 0, ram);
 206
 207     memory_region_init_io(iomem, NULL, &mips_qemu_ops, NULL, "mips-qemu", 0x10000);
 208     memory_region_add_subregion(address_space_mem, 0x1fbf0000, iomem);
 209
 210     /* Try to load a BIOS image. If this fails, we continue regardless,
 211        but initialize the hardware ourselves. When a kernel gets
 212        preloaded we also initialize the hardware, since the BIOS wasn't
 213        run. */
 214     if (bios_name == NULL)
 215         bios_name = BIOS_FILENAME;
 216     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 217     if (filename) {
 218         bios_size = get_image_size(filename);
 219     } else {
 220         bios_size = -1;
 221     }
 222 #ifdef TARGET_WORDS_BIGENDIAN
 223     be = 1;
 224 #else
 225     be = 0;
 226 #endif
 227     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 228         bios = g_new(MemoryRegion, 1);
 229         memory_region_init_ram(bios, NULL, "mips_r4k.bios", BIOS_SIZE,
 230                                &error_fatal);
 231         memory_region_set_readonly(bios, true);
 232         memory_region_add_subregion(get_system_memory(), 0x1fc00000, bios);
 233
 234         load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
 235     } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
 236         uint32_t mips_rom = 0x00400000;
 237         if (!pflash_cfi01_register(0x1fc00000, NULL, "mips_r4k.bios", mips_rom,
 238                                    blk_by_legacy_dinfo(dinfo),
 239                                    sector_len, mips_rom / sector_len,
 240                                    4, 0, 0, 0, 0, be)) {
 241             fprintf(stderr, "qemu: Error registering flash memory.\n");
 242         }
 243     } else if (!qtest_enabled()) {
 244         /* not fatal */
 245         warn_report("could not load MIPS bios '%s'", bios_name);
 246     }
 247     g_free(filename);
 248
 249     if (kernel_filename) {
 250         loaderparams.ram_size = ram_size;
 251         loaderparams.kernel_filename = kernel_filename;
 252         loaderparams.kernel_cmdline = kernel_cmdline;
 253         loaderparams.initrd_filename = initrd_filename;
 254         reset_info->vector = load_kernel();
 255     }
 256
 257     /* Init CPU internal devices */
 258     cpu_mips_irq_init_cpu(cpu);
 259     cpu_mips_clock_init(cpu);
 260
 261     /* ISA bus: IO space at 0x14000000, mem space at 0x10000000 */
 262     memory_region_init_alias(isa_io, NULL, "isa-io",
 263                              get_system_io(), 0, 0x00010000);
 264     memory_region_init(isa_mem, NULL, "isa-mem", 0x01000000);
 265     memory_region_add_subregion(get_system_memory(), 0x14000000, isa_io);
 266     memory_region_add_subregion(get_system_memory(), 0x10000000, isa_mem);
 267     isa_bus = isa_bus_new(NULL, isa_mem, get_system_io(), &error_abort);
 268
 269     /* The PIC is attached to the MIPS CPU INT0 pin */
 270     i8259 = i8259_init(isa_bus, env->irq[2]);
 271     isa_bus_irqs(isa_bus, i8259);
 272
 273     mc146818_rtc_init(isa_bus, 2000, NULL);
 274
 275     pit = i8254_pit_init(isa_bus, 0x40, 0, NULL);
 276
 277     serial_hds_isa_init(isa_bus, 0, MAX_ISA_SERIAL_PORTS);
 278
 279     isa_vga_init(isa_bus);
 280
 281     if (nd_table[0].used)
 282         isa_ne2000_init(isa_bus, 0x300, 9, &nd_table[0]);
 283
 284     ide_drive_get(hd, ARRAY_SIZE(hd));
 285     for(i = 0; i < MAX_IDE_BUS; i++)
 286         isa_ide_init(isa_bus, ide_iobase[i], ide_iobase2[i], ide_irq[i],
 287                      hd[MAX_IDE_DEVS * i],
 288                      hd[MAX_IDE_DEVS * i + 1]);
 289
 290     isa_create_simple(isa_bus, TYPE_I8042);
 291 }
 292
 293 static void mips_machine_init(MachineClass *mc)
 294 {
 295     mc->desc = "mips r4k platform";
 296     mc->init = mips_r4k_init;
 297     mc->block_default_type = IF_IDE;
 298 #ifdef TARGET_MIPS64
 299     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("R4000");
 300 #else
 301     mc->default_cpu_type = MIPS_CPU_TYPE_NAME("24Kf");
 302 #endif
 303
 304 }
 305
 306 DEFINE_MACHINE("mips", mips_machine_init)