hw/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.h"
  11 #include "mips.h"
  12 #include "pc.h"
  13 #include "isa.h"
  14 #include "net.h"
  15 #include "sysemu.h"
  16 #include "boards.h"
  17 #include "flash.h"
  18 #include "qemu-log.h"
  19 #include "mips-bios.h"
  20 #include "ide.h"
  21 #include "loader.h"
  22 #include "elf.h"
  23
  24 #define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
  25
  26 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  27
  28 #define MAX_IDE_BUS 2
  29
  30 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  31 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  32 static const int ide_irq[2] = { 14, 15 };
  33
  34 static PITState *pit; /* PIT i8254 */
  35
  36 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  37
  38 static struct _loaderparams {
  39     int ram_size;
  40     const char *kernel_filename;
  41     const char *kernel_cmdline;
  42     const char *initrd_filename;
  43 } loaderparams;
  44
  45 static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
  46                               uint32_t val)
  47 {
  48     if ((addr & 0xffff) == 0 && val == 42)
  49         qemu_system_reset_request ();
  50     else if ((addr & 0xffff) == 4 && val == 42)
  51         qemu_system_shutdown_request ();
  52 }
  53
  54 static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
  55 {
  56     return 0;
  57 }
  58
  59 static CPUWriteMemoryFunc * const mips_qemu_write[] = {
  60     &mips_qemu_writel,
  61     &mips_qemu_writel,
  62     &mips_qemu_writel,
  63 };
  64
  65 static CPUReadMemoryFunc * const mips_qemu_read[] = {
  66     &mips_qemu_readl,
  67     &mips_qemu_readl,
  68     &mips_qemu_readl,
  69 };
  70
  71 static int mips_qemu_iomemtype = 0;
  72
  73 typedef struct ResetData {
  74     CPUState *env;
  75     uint64_t vector;
  76 } ResetData;
  77
  78 static int64_t load_kernel(void)
  79 {
  80     int64_t entry, kernel_low, kernel_high;
  81     long kernel_size, initrd_size;
  82     ram_addr_t initrd_offset;
  83     int ret;
  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, VIRT_TO_PHYS_ADDEND,
  92                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  93                            (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
  94     if (kernel_size >= 0) {
  95         if ((entry & ~0x7fffffffULL) == 0x80000000)
  96             entry = (int32_t)entry;
  97     } else {
  98         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  99                 loaderparams.kernel_filename);
 100         exit(1);
 101     }
 102
 103     /* load initrd */
 104     initrd_size = 0;
 105     initrd_offset = 0;
 106     if (loaderparams.initrd_filename) {
 107         initrd_size = get_image_size (loaderparams.initrd_filename);
 108         if (initrd_size > 0) {
 109             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
 110             if (initrd_offset + initrd_size > ram_size) {
 111                 fprintf(stderr,
 112                         "qemu: memory too small for initial ram disk '%s'\n",
 113                         loaderparams.initrd_filename);
 114                 exit(1);
 115             }
 116             initrd_size = load_image_targphys(loaderparams.initrd_filename,
 117                                               initrd_offset,
 118                                               ram_size - initrd_offset);
 119         }
 120         if (initrd_size == (target_ulong) -1) {
 121             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 122                     loaderparams.initrd_filename);
 123             exit(1);
 124         }
 125     }
 126
 127     /* Store command line.  */
 128     if (initrd_size > 0) {
 129         char buf[64];
 130         ret = snprintf(buf, 64, "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
 131                        PHYS_TO_VIRT((uint32_t)initrd_offset),
 132                        initrd_size);
 133         cpu_physical_memory_write((16 << 20) - 256, (void *)buf, 64);
 134     } else {
 135         ret = 0;
 136     }
 137     pstrcpy_targphys("cmdline", (16 << 20) - 256 + ret, 256,
 138                      loaderparams.kernel_cmdline);
 139
 140     stl_phys((16 << 20) - 260, 0x12345678);
 141     stl_phys((16 << 20) - 264, ram_size);
 142     return entry;
 143 }
 144
 145 static void main_cpu_reset(void *opaque)
 146 {
 147     ResetData *s = (ResetData *)opaque;
 148     CPUState *env = s->env;
 149
 150     cpu_reset(env);
 151     env->active_tc.PC = s->vector;
 152 }
 153
 154 static const int sector_len = 32 * 1024;
 155 static
 156 void mips_r4k_init (ram_addr_t ram_size,
 157                     const char *boot_device,
 158                     const char *kernel_filename, const char *kernel_cmdline,
 159                     const char *initrd_filename, const char *cpu_model)
 160 {
 161     char *filename;
 162     ram_addr_t ram_offset;
 163     ram_addr_t bios_offset;
 164     int bios_size;
 165     CPUState *env;
 166     ResetData *reset_info;
 167     RTCState *rtc_state;
 168     int i;
 169     qemu_irq *i8259;
 170     DriveInfo *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 171     DriveInfo *dinfo;
 172
 173     /* init CPUs */
 174     if (cpu_model == NULL) {
 175 #ifdef TARGET_MIPS64
 176         cpu_model = "R4000";
 177 #else
 178         cpu_model = "24Kf";
 179 #endif
 180     }
 181     env = cpu_init(cpu_model);
 182     if (!env) {
 183         fprintf(stderr, "Unable to find CPU definition\n");
 184         exit(1);
 185     }
 186     reset_info = qemu_mallocz(sizeof(ResetData));
 187     reset_info->env = env;
 188     reset_info->vector = env->active_tc.PC;
 189     qemu_register_reset(main_cpu_reset, reset_info);
 190
 191     /* allocate RAM */
 192     if (ram_size > (256 << 20)) {
 193         fprintf(stderr,
 194                 "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
 195                 ((unsigned int)ram_size / (1 << 20)));
 196         exit(1);
 197     }
 198     ram_offset = qemu_ram_alloc(ram_size);
 199
 200     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 201
 202     if (!mips_qemu_iomemtype) {
 203         mips_qemu_iomemtype = cpu_register_io_memory(mips_qemu_read,
 204                                                      mips_qemu_write, NULL);
 205     }
 206     cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
 207
 208     /* Try to load a BIOS image. If this fails, we continue regardless,
 209        but initialize the hardware ourselves. When a kernel gets
 210        preloaded we also initialize the hardware, since the BIOS wasn't
 211        run. */
 212     if (bios_name == NULL)
 213         bios_name = BIOS_FILENAME;
 214     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 215     if (filename) {
 216         bios_size = get_image_size(filename);
 217     } else {
 218         bios_size = -1;
 219     }
 220     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 221         bios_offset = qemu_ram_alloc(BIOS_SIZE);
 222         cpu_register_physical_memory(0x1fc00000, BIOS_SIZE,
 223                                      bios_offset | IO_MEM_ROM);
 224
 225         load_image_targphys(filename, 0x1fc00000, BIOS_SIZE);
 226     } else if ((dinfo = drive_get(IF_PFLASH, 0, 0)) != NULL) {
 227         uint32_t mips_rom = 0x00400000;
 228         bios_offset = qemu_ram_alloc(mips_rom);
 229         if (!pflash_cfi01_register(0x1fc00000, bios_offset,
 230             dinfo->bdrv, sector_len, mips_rom / sector_len,
 231             4, 0, 0, 0, 0)) {
 232             fprintf(stderr, "qemu: Error registering flash memory.\n");
 233         }
 234     }
 235     else {
 236         /* not fatal */
 237         fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
 238                 bios_name);
 239     }
 240     if (filename) {
 241         qemu_free(filename);
 242     }
 243
 244     if (kernel_filename) {
 245         loaderparams.ram_size = ram_size;
 246         loaderparams.kernel_filename = kernel_filename;
 247         loaderparams.kernel_cmdline = kernel_cmdline;
 248         loaderparams.initrd_filename = initrd_filename;
 249         reset_info->vector = load_kernel();
 250     }
 251
 252     /* Init CPU internal devices */
 253     cpu_mips_irq_init_cpu(env);
 254     cpu_mips_clock_init(env);
 255
 256     /* The PIC is attached to the MIPS CPU INT0 pin */
 257     i8259 = i8259_init(env->irq[2]);
 258     isa_bus_new(NULL);
 259     isa_bus_irqs(i8259);
 260
 261     rtc_state = rtc_init(2000);
 262
 263     /* Register 64 KB of ISA IO space at 0x14000000 */
 264     isa_mmio_init(0x14000000, 0x00010000);
 265     isa_mem_base = 0x10000000;
 266
 267     pit = pit_init(0x40, i8259[0]);
 268
 269     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
 270         if (serial_hds[i]) {
 271             serial_isa_init(i, serial_hds[i]);
 272         }
 273     }
 274
 275     isa_vga_init();
 276
 277     if (nd_table[0].vlan)
 278         isa_ne2000_init(0x300, 9, &nd_table[0]);
 279
 280     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
 281         fprintf(stderr, "qemu: too many IDE bus\n");
 282         exit(1);
 283     }
 284
 285     for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
 286         hd[i] = drive_get(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
 287     }
 288
 289     for(i = 0; i < MAX_IDE_BUS; i++)
 290         isa_ide_init(ide_iobase[i], ide_iobase2[i], ide_irq[i],
 291                      hd[MAX_IDE_DEVS * i],
 292                      hd[MAX_IDE_DEVS * i + 1]);
 293
 294     isa_create_simple("i8042");
 295 }
 296
 297 static QEMUMachine mips_machine = {
 298     .name = "mips",
 299     .desc = "mips r4k platform",
 300     .init = mips_r4k_init,
 301 };
 302
 303 static void mips_machine_init(void)
 304 {
 305     qemu_register_machine(&mips_machine);
 306 }
 307
 308 machine_init(mips_machine_init);