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 "mips_cpudevs.h"
  30 #include "pc.h"
  31 #include "isa.h"
  32 #include "net.h"
  33 #include "sysemu.h"
  34 #include "boards.h"
  35 #include "mips-bios.h"
  36 #include "loader.h"
  37 #include "elf.h"
  38
  39 static struct _loaderparams {
  40     int ram_size;
  41     const char *kernel_filename;
  42     const char *kernel_cmdline;
  43     const char *initrd_filename;
  44 } loaderparams;
  45
  46 typedef struct ResetData {
  47     CPUState *env;
  48     uint64_t vector;
  49 } ResetData;
  50
  51 static int64_t load_kernel(void)
  52 {
  53     int64_t entry, kernel_high;
  54     long kernel_size;
  55     long initrd_size;
  56     ram_addr_t initrd_offset;
  57     int big_endian;
  58
  59 #ifdef TARGET_WORDS_BIGENDIAN
  60     big_endian = 1;
  61 #else
  62     big_endian = 0;
  63 #endif
  64
  65     kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys,
  66                            NULL, (uint64_t *)&entry, NULL,
  67                            (uint64_t *)&kernel_high, big_endian,
  68                            ELF_MACHINE, 1);
  69     if (kernel_size >= 0) {
  70         if ((entry & ~0x7fffffffULL) == 0x80000000)
  71             entry = (int32_t)entry;
  72     } else {
  73         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  74                 loaderparams.kernel_filename);
  75         exit(1);
  76     }
  77
  78     /* load initrd */
  79     initrd_size = 0;
  80     initrd_offset = 0;
  81     if (loaderparams.initrd_filename) {
  82         initrd_size = get_image_size (loaderparams.initrd_filename);
  83         if (initrd_size > 0) {
  84             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  85             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  86                 fprintf(stderr,
  87                         "qemu: memory too small for initial ram disk '%s'\n",
  88                         loaderparams.initrd_filename);
  89                 exit(1);
  90             }
  91             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  92                 initrd_offset, loaderparams.ram_size - initrd_offset);
  93         }
  94         if (initrd_size == (target_ulong) -1) {
  95             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  96                     loaderparams.initrd_filename);
  97             exit(1);
  98         }
  99     }
 100     return entry;
 101 }
 102
 103 static void main_cpu_reset(void *opaque)
 104 {
 105     ResetData *s = (ResetData *)opaque;
 106     CPUState *env = s->env;
 107
 108     cpu_reset(env);
 109     env->active_tc.PC = s->vector & ~(target_ulong)1;
 110     if (s->vector & 1) {
 111         env->hflags |= MIPS_HFLAG_M16;
 112     }
 113 }
 114
 115 static void
 116 mips_mipssim_init (ram_addr_t ram_size,
 117                    const char *boot_device,
 118                    const char *kernel_filename, const char *kernel_cmdline,
 119                    const char *initrd_filename, const char *cpu_model)
 120 {
 121     char *filename;
 122     ram_addr_t ram_offset;
 123     ram_addr_t bios_offset;
 124     CPUState *env;
 125     ResetData *reset_info;
 126     int bios_size;
 127
 128     /* Init CPUs. */
 129     if (cpu_model == NULL) {
 130 #ifdef TARGET_MIPS64
 131         cpu_model = "5Kf";
 132 #else
 133         cpu_model = "24Kf";
 134 #endif
 135     }
 136     env = cpu_init(cpu_model);
 137     if (!env) {
 138         fprintf(stderr, "Unable to find CPU definition\n");
 139         exit(1);
 140     }
 141     reset_info = qemu_mallocz(sizeof(ResetData));
 142     reset_info->env = env;
 143     reset_info->vector = env->active_tc.PC;
 144     qemu_register_reset(main_cpu_reset, reset_info);
 145
 146     /* Allocate RAM. */
 147     ram_offset = qemu_ram_alloc(NULL, "mips_mipssim.ram", ram_size);
 148     bios_offset = qemu_ram_alloc(NULL, "mips_mipssim.bios", BIOS_SIZE);
 149
 150     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 151
 152     /* Map the BIOS / boot exception handler. */
 153     cpu_register_physical_memory(0x1fc00000LL,
 154                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 155     /* Load a BIOS / boot exception handler image. */
 156     if (bios_name == NULL)
 157         bios_name = BIOS_FILENAME;
 158     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 159     if (filename) {
 160         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 161         qemu_free(filename);
 162     } else {
 163         bios_size = -1;
 164     }
 165     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 166         /* Bail out if we have neither a kernel image nor boot vector code. */
 167         fprintf(stderr,
 168                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 169                 filename);
 170         exit(1);
 171     } else {
 172         /* We have a boot vector start address. */
 173         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 174     }
 175
 176     if (kernel_filename) {
 177         loaderparams.ram_size = ram_size;
 178         loaderparams.kernel_filename = kernel_filename;
 179         loaderparams.kernel_cmdline = kernel_cmdline;
 180         loaderparams.initrd_filename = initrd_filename;
 181         reset_info->vector = load_kernel();
 182     }
 183
 184     /* Init CPU internal devices. */
 185     cpu_mips_irq_init_cpu(env);
 186     cpu_mips_clock_init(env);
 187
 188     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 189 #ifdef TARGET_WORDS_BIGENDIAN
 190     isa_mmio_init(0x1fd00000, 0x00010000, 1);
 191 #else
 192     isa_mmio_init(0x1fd00000, 0x00010000, 0);
 193 #endif
 194
 195     /* A single 16450 sits at offset 0x3f8. It is attached to
 196        MIPS CPU INT2, which is interrupt 4. */
 197     if (serial_hds[0])
 198         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 199
 200     if (nd_table[0].vlan)
 201         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 202         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 203 }
 204
 205 static QEMUMachine mips_mipssim_machine = {
 206     .name = "mipssim",
 207     .desc = "MIPS MIPSsim platform",
 208     .init = mips_mipssim_init,
 209 };
 210
 211 static void mips_mipssim_machine_init(void)
 212 {
 213     qemu_register_machine(&mips_mipssim_machine);
 214 }
 215
 216 machine_init(mips_mipssim_machine_init);