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
  20 #ifdef TARGET_WORDS_BIGENDIAN
  21 #define BIOS_FILENAME "mips_bios.bin"
  22 #else
  23 #define BIOS_FILENAME "mipsel_bios.bin"
  24 #endif
  25
  26 #define PHYS_TO_VIRT(x) ((x) | ~(target_ulong)0x7fffffff)
  27
  28 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  29
  30 #define MAX_IDE_BUS 2
  31
  32 static const int ide_iobase[2] = { 0x1f0, 0x170 };
  33 static const int ide_iobase2[2] = { 0x3f6, 0x376 };
  34 static const int ide_irq[2] = { 14, 15 };
  35
  36 static int serial_io[MAX_SERIAL_PORTS] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8 };
  37 static int serial_irq[MAX_SERIAL_PORTS] = { 4, 3, 4, 3 };
  38
  39 static PITState *pit; /* PIT i8254 */
  40
  41 /* i8254 PIT is attached to the IRQ0 at PIC i8259 */
  42
  43 static struct _loaderparams {
  44     int ram_size;
  45     const char *kernel_filename;
  46     const char *kernel_cmdline;
  47     const char *initrd_filename;
  48 } loaderparams;
  49
  50 static void mips_qemu_writel (void *opaque, target_phys_addr_t addr,
  51                               uint32_t val)
  52 {
  53     if ((addr & 0xffff) == 0 && val == 42)
  54         qemu_system_reset_request ();
  55     else if ((addr & 0xffff) == 4 && val == 42)
  56         qemu_system_shutdown_request ();
  57 }
  58
  59 static uint32_t mips_qemu_readl (void *opaque, target_phys_addr_t addr)
  60 {
  61     return 0;
  62 }
  63
  64 static CPUWriteMemoryFunc *mips_qemu_write[] = {
  65     &mips_qemu_writel,
  66     &mips_qemu_writel,
  67     &mips_qemu_writel,
  68 };
  69
  70 static CPUReadMemoryFunc *mips_qemu_read[] = {
  71     &mips_qemu_readl,
  72     &mips_qemu_readl,
  73     &mips_qemu_readl,
  74 };
  75
  76 static int mips_qemu_iomemtype = 0;
  77
  78 static void load_kernel (CPUState *env)
  79 {
  80     int64_t entry, kernel_low, kernel_high;
  81     long kernel_size, initrd_size;
  82     ram_addr_t initrd_offset;
  83
  84     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  85                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  86                            (uint64_t *)&kernel_high);
  87     if (kernel_size >= 0) {
  88         if ((entry & ~0x7fffffffULL) == 0x80000000)
  89             entry = (int32_t)entry;
  90         env->active_tc.PC = entry;
  91     } else {
  92         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  93                 loaderparams.kernel_filename);
  94         exit(1);
  95     }
  96
  97     /* load initrd */
  98     initrd_size = 0;
  99     initrd_offset = 0;
 100     if (loaderparams.initrd_filename) {
 101         initrd_size = get_image_size (loaderparams.initrd_filename);
 102         if (initrd_size > 0) {
 103             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
 104             if (initrd_offset + initrd_size > ram_size) {
 105                 fprintf(stderr,
 106                         "qemu: memory too small for initial ram disk '%s'\n",
 107                         loaderparams.initrd_filename);
 108                 exit(1);
 109             }
 110             initrd_size = load_image(loaderparams.initrd_filename,
 111                                      phys_ram_base + initrd_offset);
 112         }
 113         if (initrd_size == (target_ulong) -1) {
 114             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
 115                     loaderparams.initrd_filename);
 116             exit(1);
 117         }
 118     }
 119
 120     /* Store command line.  */
 121     if (initrd_size > 0) {
 122         int ret;
 123         ret = sprintf((char *)(phys_ram_base + (16 << 20) - 256),
 124                       "rd_start=0x" TARGET_FMT_lx " rd_size=%li ",
 125                       PHYS_TO_VIRT((uint32_t)initrd_offset),
 126                       initrd_size);
 127         strcpy ((char *)(phys_ram_base + (16 << 20) - 256 + ret),
 128                 loaderparams.kernel_cmdline);
 129     }
 130     else {
 131         strcpy ((char *)(phys_ram_base + (16 << 20) - 256),
 132                 loaderparams.kernel_cmdline);
 133     }
 134
 135     *(int32_t *)(phys_ram_base + (16 << 20) - 260) = tswap32 (0x12345678);
 136     *(int32_t *)(phys_ram_base + (16 << 20) - 264) = tswap32 (ram_size);
 137 }
 138
 139 static void main_cpu_reset(void *opaque)
 140 {
 141     CPUState *env = opaque;
 142     cpu_reset(env);
 143
 144     if (loaderparams.kernel_filename)
 145         load_kernel (env);
 146 }
 147
 148 static const int sector_len = 32 * 1024;
 149 static
 150 void mips_r4k_init (ram_addr_t ram_size, int vga_ram_size,
 151                     const char *boot_device,
 152                     const char *kernel_filename, const char *kernel_cmdline,
 153                     const char *initrd_filename, const char *cpu_model)
 154 {
 155     char buf[1024];
 156     unsigned long bios_offset;
 157     int bios_size;
 158     CPUState *env;
 159     RTCState *rtc_state;
 160     int i;
 161     qemu_irq *i8259;
 162     int index;
 163     BlockDriverState *hd[MAX_IDE_BUS * MAX_IDE_DEVS];
 164
 165     /* init CPUs */
 166     if (cpu_model == NULL) {
 167 #ifdef TARGET_MIPS64
 168         cpu_model = "R4000";
 169 #else
 170         cpu_model = "24Kf";
 171 #endif
 172     }
 173     env = cpu_init(cpu_model);
 174     if (!env) {
 175         fprintf(stderr, "Unable to find CPU definition\n");
 176         exit(1);
 177     }
 178     qemu_register_reset(main_cpu_reset, env);
 179
 180     /* allocate RAM */
 181     if (ram_size > (256 << 20)) {
 182         fprintf(stderr,
 183                 "qemu: Too much memory for this machine: %d MB, maximum 256 MB\n",
 184                 ((unsigned int)ram_size / (1 << 20)));
 185         exit(1);
 186     }
 187     cpu_register_physical_memory(0, ram_size, IO_MEM_RAM);
 188
 189     if (!mips_qemu_iomemtype) {
 190         mips_qemu_iomemtype = cpu_register_io_memory(0, mips_qemu_read,
 191                                                      mips_qemu_write, NULL);
 192     }
 193     cpu_register_physical_memory(0x1fbf0000, 0x10000, mips_qemu_iomemtype);
 194
 195     /* Try to load a BIOS image. If this fails, we continue regardless,
 196        but initialize the hardware ourselves. When a kernel gets
 197        preloaded we also initialize the hardware, since the BIOS wasn't
 198        run. */
 199     bios_offset = ram_size + vga_ram_size;
 200     if (bios_name == NULL)
 201         bios_name = BIOS_FILENAME;
 202     snprintf(buf, sizeof(buf), "%s/%s", bios_dir, bios_name);
 203     bios_size = load_image(buf, phys_ram_base + bios_offset);
 204     if ((bios_size > 0) && (bios_size <= BIOS_SIZE)) {
 205         cpu_register_physical_memory(0x1fc00000,
 206                                      BIOS_SIZE, bios_offset | IO_MEM_ROM);
 207     } else if ((index = drive_get_index(IF_PFLASH, 0, 0)) > -1) {
 208         uint32_t mips_rom = 0x00400000;
 209         cpu_register_physical_memory(0x1fc00000, mips_rom,
 210                              qemu_ram_alloc(mips_rom) | IO_MEM_ROM);
 211         if (!pflash_cfi01_register(0x1fc00000, qemu_ram_alloc(mips_rom),
 212             drives_table[index].bdrv, sector_len, mips_rom / sector_len,
 213             4, 0, 0, 0, 0)) {
 214             fprintf(stderr, "qemu: Error registering flash memory.\n");
 215         }
 216     }
 217     else {
 218         /* not fatal */
 219         fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
 220                 buf);
 221     }
 222
 223     if (kernel_filename) {
 224         loaderparams.ram_size = ram_size;
 225         loaderparams.kernel_filename = kernel_filename;
 226         loaderparams.kernel_cmdline = kernel_cmdline;
 227         loaderparams.initrd_filename = initrd_filename;
 228         load_kernel (env);
 229     }
 230
 231     /* Init CPU internal devices */
 232     cpu_mips_irq_init_cpu(env);
 233     cpu_mips_clock_init(env);
 234
 235     /* The PIC is attached to the MIPS CPU INT0 pin */
 236     i8259 = i8259_init(env->irq[2]);
 237
 238     rtc_state = rtc_init(0x70, i8259[8], 2000);
 239
 240     /* Register 64 KB of ISA IO space at 0x14000000 */
 241     isa_mmio_init(0x14000000, 0x00010000);
 242     isa_mem_base = 0x10000000;
 243
 244     pit = pit_init(0x40, i8259[0]);
 245
 246     for(i = 0; i < MAX_SERIAL_PORTS; i++) {
 247         if (serial_hds[i]) {
 248             serial_init(serial_io[i], i8259[serial_irq[i]], 115200,
 249                         serial_hds[i]);
 250         }
 251     }
 252
 253     isa_vga_init(phys_ram_base + ram_size, ram_size,
 254                  vga_ram_size);
 255
 256     if (nd_table[0].vlan)
 257         isa_ne2000_init(0x300, i8259[9], &nd_table[0]);
 258
 259     if (drive_get_max_bus(IF_IDE) >= MAX_IDE_BUS) {
 260         fprintf(stderr, "qemu: too many IDE bus\n");
 261         exit(1);
 262     }
 263
 264     for(i = 0; i < MAX_IDE_BUS * MAX_IDE_DEVS; i++) {
 265         index = drive_get_index(IF_IDE, i / MAX_IDE_DEVS, i % MAX_IDE_DEVS);
 266         if (index != -1)
 267             hd[i] = drives_table[index].bdrv;
 268         else
 269             hd[i] = NULL;
 270     }
 271
 272     for(i = 0; i < MAX_IDE_BUS; i++)
 273         isa_ide_init(ide_iobase[i], ide_iobase2[i], i8259[ide_irq[i]],
 274                      hd[MAX_IDE_DEVS * i],
 275                      hd[MAX_IDE_DEVS * i + 1]);
 276
 277     i8042_init(i8259[1], i8259[12], 0x60);
 278 }
 279
 280 QEMUMachine mips_machine = {
 281     .name = "mips",
 282     .desc = "mips r4k platform",
 283     .init = mips_r4k_init,
 284     .ram_require = VGA_RAM_SIZE + BIOS_SIZE,
 285     .nodisk_ok = 1,
 286 };