hw/mips_mipssim.c

   1 /*
   2  * QEMU/mipssim emulation
   3  *
   4  * Emulates a very simple machine model similiar to the one use by the
   5  * proprietary MIPS emulator.
   6  *
   7  * Copyright (c) 2007 Thiemo Seufer
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a copy
  10  * of this software and associated documentation files (the "Software"), to deal
  11  * in the Software without restriction, including without limitation the rights
  12  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13  * copies of the Software, and to permit persons to whom the Software is
  14  * furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included in
  17  * all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  22  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25  * THE SOFTWARE.
  26  */
  27 #include "hw.h"
  28 #include "mips.h"
  29 #include "pc.h"
  30 #include "isa.h"
  31 #include "net.h"
  32 #include "sysemu.h"
  33 #include "boards.h"
  34 #include "mips-bios.h"
  35 #include "loader.h"
  36 #include "elf.h"
  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 typedef struct ResetData {
  46     CPUState *env;
  47     uint64_t vector;
  48 } ResetData;
  49
  50 static int64_t load_kernel(void)
  51 {
  52     int64_t entry, kernel_high;
  53     long kernel_size;
  54     long initrd_size;
  55     ram_addr_t initrd_offset;
  56     int big_endian;
  57
  58 #ifdef TARGET_WORDS_BIGENDIAN
  59     big_endian = 1;
  60 #else
  61     big_endian = 0;
  62 #endif
  63
  64     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
  65                            NULL, (uint64_t *)&entry, NULL,
  66                            (uint64_t *)&kernel_high, big_endian,
  67                            ELF_MACHINE, 1);
  68     if (kernel_size >= 0) {
  69         if ((entry & ~0x7fffffffULL) == 0x80000000)
  70             entry = (int32_t)entry;
  71     } else {
  72         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  73                 loaderparams.kernel_filename);
  74         exit(1);
  75     }
  76
  77     /* load initrd */
  78     initrd_size = 0;
  79     initrd_offset = 0;
  80     if (loaderparams.initrd_filename) {
  81         initrd_size = get_image_size (loaderparams.initrd_filename);
  82         if (initrd_size > 0) {
  83             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  84             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  85                 fprintf(stderr,
  86                         "qemu: memory too small for initial ram disk '%s'\n",
  87                         loaderparams.initrd_filename);
  88                 exit(1);
  89             }
  90             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  91                 initrd_offset, loaderparams.ram_size - initrd_offset);
  92         }
  93         if (initrd_size == (target_ulong) -1) {
  94             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  95                     loaderparams.initrd_filename);
  96             exit(1);
  97         }
  98     }
  99     return entry;
 100 }
 101
 102 static void main_cpu_reset(void *opaque)
 103 {
 104     ResetData *s = (ResetData *)opaque;
 105     CPUState *env = s->env;
 106
 107     cpu_reset(env);
 108     env->active_tc.PC = s->vector;
 109 }
 110
 111 static void
 112 mips_mipssim_init (ram_addr_t ram_size,
 113                    const char *boot_device,
 114                    const char *kernel_filename, const char *kernel_cmdline,
 115                    const char *initrd_filename, const char *cpu_model)
 116 {
 117     char *filename;
 118     ram_addr_t ram_offset;
 119     ram_addr_t bios_offset;
 120     CPUState *env;
 121     ResetData *reset_info;
 122     int bios_size;
 123
 124     /* Init CPUs. */
 125     if (cpu_model == NULL) {
 126 #ifdef TARGET_MIPS64
 127         cpu_model = "5Kf";
 128 #else
 129         cpu_model = "24Kf";
 130 #endif
 131     }
 132     env = cpu_init(cpu_model);
 133     if (!env) {
 134         fprintf(stderr, "Unable to find CPU definition\n");
 135         exit(1);
 136     }
 137     reset_info = qemu_mallocz(sizeof(ResetData));
 138     reset_info->env = env;
 139     reset_info->vector = env->active_tc.PC;
 140     qemu_register_reset(main_cpu_reset, reset_info);
 141
 142     /* Allocate RAM. */
 143     ram_offset = qemu_ram_alloc(ram_size);
 144     bios_offset = qemu_ram_alloc(BIOS_SIZE);
 145
 146     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 147
 148     /* Map the BIOS / boot exception handler. */
 149     cpu_register_physical_memory(0x1fc00000LL,
 150                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 151     /* Load a BIOS / boot exception handler image. */
 152     if (bios_name == NULL)
 153         bios_name = BIOS_FILENAME;
 154     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 155     if (filename) {
 156         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 157         qemu_free(filename);
 158     } else {
 159         bios_size = -1;
 160     }
 161     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 162         /* Bail out if we have neither a kernel image nor boot vector code. */
 163         fprintf(stderr,
 164                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 165                 filename);
 166         exit(1);
 167     } else {
 168         /* We have a boot vector start address. */
 169         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 170     }
 171
 172     if (kernel_filename) {
 173         loaderparams.ram_size = ram_size;
 174         loaderparams.kernel_filename = kernel_filename;
 175         loaderparams.kernel_cmdline = kernel_cmdline;
 176         loaderparams.initrd_filename = initrd_filename;
 177         reset_info->vector = load_kernel();
 178     }
 179
 180     /* Init CPU internal devices. */
 181     cpu_mips_irq_init_cpu(env);
 182     cpu_mips_clock_init(env);
 183
 184     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 185     isa_mmio_init(0x1fd00000, 0x00010000);
 186
 187     /* A single 16450 sits at offset 0x3f8. It is attached to
 188        MIPS CPU INT2, which is interrupt 4. */
 189     if (serial_hds[0])
 190         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 191
 192     if (nd_table[0].vlan)
 193         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 194         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 195 }
 196
 197 static QEMUMachine mips_mipssim_machine = {
 198     .name = "mipssim",
 199     .desc = "MIPS MIPSsim platform",
 200     .init = mips_mipssim_init,
 201 };
 202
 203 static void mips_mipssim_machine_init(void)
 204 {
 205     qemu_register_machine(&mips_mipssim_machine);
 206 }
 207
 208 machine_init(mips_mipssim_machine_init);