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 #ifdef TARGET_MIPS64
  39 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffULL)
  40 #else
  41 #define PHYS_TO_VIRT(x) ((x) | ~0x7fffffffU)
  42 #endif
  43
  44 #define VIRT_TO_PHYS_ADDEND (-((int64_t)(int32_t)0x80000000))
  45
  46 static struct _loaderparams {
  47     int ram_size;
  48     const char *kernel_filename;
  49     const char *kernel_cmdline;
  50     const char *initrd_filename;
  51 } loaderparams;
  52
  53 static void load_kernel (CPUState *env)
  54 {
  55     int64_t entry, kernel_low, kernel_high;
  56     long kernel_size;
  57     long initrd_size;
  58     a_ram_addr initrd_offset;
  59     int big_endian;
  60
  61 #ifdef TARGET_WORDS_BIGENDIAN
  62     big_endian = 1;
  63 #else
  64     big_endian = 0;
  65 #endif
  66
  67     kernel_size = load_elf(loaderparams.kernel_filename, VIRT_TO_PHYS_ADDEND,
  68                            (uint64_t *)&entry, (uint64_t *)&kernel_low,
  69                            (uint64_t *)&kernel_high, big_endian, ELF_MACHINE, 1);
  70     if (kernel_size >= 0) {
  71         if ((entry & ~0x7fffffffULL) == 0x80000000)
  72             entry = (int32_t)entry;
  73         env->active_tc.PC = entry;
  74     } else {
  75         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  76                 loaderparams.kernel_filename);
  77         exit(1);
  78     }
  79
  80     /* load initrd */
  81     initrd_size = 0;
  82     initrd_offset = 0;
  83     if (loaderparams.initrd_filename) {
  84         initrd_size = get_image_size (loaderparams.initrd_filename);
  85         if (initrd_size > 0) {
  86             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK) & TARGET_PAGE_MASK;
  87             if (initrd_offset + initrd_size > loaderparams.ram_size) {
  88                 fprintf(stderr,
  89                         "qemu: memory too small for initial ram disk '%s'\n",
  90                         loaderparams.initrd_filename);
  91                 exit(1);
  92             }
  93             initrd_size = load_image_targphys(loaderparams.initrd_filename,
  94                 initrd_offset, loaderparams.ram_size - initrd_offset);
  95         }
  96         if (initrd_size == (target_ulong) -1) {
  97             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  98                     loaderparams.initrd_filename);
  99             exit(1);
 100         }
 101     }
 102 }
 103
 104 static void main_cpu_reset(void *opaque)
 105 {
 106     CPUState *env = opaque;
 107     cpu_reset(env);
 108
 109     if (loaderparams.kernel_filename)
 110         load_kernel (env);
 111 }
 112
 113 static void
 114 mips_mipssim_init (a_ram_addr ram_size,
 115                    const char *boot_device,
 116                    const char *kernel_filename, const char *kernel_cmdline,
 117                    const char *initrd_filename, const char *cpu_model)
 118 {
 119     char *filename;
 120     a_ram_addr ram_offset;
 121     a_ram_addr bios_offset;
 122     CPUState *env;
 123     int bios_size;
 124
 125     /* Init CPUs. */
 126     if (cpu_model == NULL) {
 127 #ifdef TARGET_MIPS64
 128         cpu_model = "5Kf";
 129 #else
 130         cpu_model = "24Kf";
 131 #endif
 132     }
 133     env = cpu_init(cpu_model);
 134     if (!env) {
 135         fprintf(stderr, "Unable to find CPU definition\n");
 136         exit(1);
 137     }
 138     qemu_register_reset(main_cpu_reset, env);
 139
 140     /* Allocate RAM. */
 141     ram_offset = qemu_ram_alloc(ram_size);
 142     bios_offset = qemu_ram_alloc(BIOS_SIZE);
 143
 144     cpu_register_physical_memory(0, ram_size, ram_offset | IO_MEM_RAM);
 145
 146     /* Map the BIOS / boot exception handler. */
 147     cpu_register_physical_memory(0x1fc00000LL,
 148                                  BIOS_SIZE, bios_offset | IO_MEM_ROM);
 149     /* Load a BIOS / boot exception handler image. */
 150     if (bios_name == NULL)
 151         bios_name = BIOS_FILENAME;
 152     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 153     if (filename) {
 154         bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE);
 155         qemu_free(filename);
 156     } else {
 157         bios_size = -1;
 158     }
 159     if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) {
 160         /* Bail out if we have neither a kernel image nor boot vector code. */
 161         fprintf(stderr,
 162                 "qemu: Could not load MIPS bios '%s', and no -kernel argument was specified\n",
 163                 filename);
 164         exit(1);
 165     } else {
 166         /* We have a boot vector start address. */
 167         env->active_tc.PC = (target_long)(int32_t)0xbfc00000;
 168     }
 169
 170     if (kernel_filename) {
 171         loaderparams.ram_size = ram_size;
 172         loaderparams.kernel_filename = kernel_filename;
 173         loaderparams.kernel_cmdline = kernel_cmdline;
 174         loaderparams.initrd_filename = initrd_filename;
 175         load_kernel(env);
 176     }
 177
 178     /* Init CPU internal devices. */
 179     cpu_mips_irq_init_cpu(env);
 180     cpu_mips_clock_init(env);
 181
 182     /* Register 64 KB of ISA IO space at 0x1fd00000. */
 183     isa_mmio_init(0x1fd00000, 0x00010000);
 184
 185     /* A single 16450 sits at offset 0x3f8. It is attached to
 186        MIPS CPU INT2, which is interrupt 4. */
 187     if (serial_hds[0])
 188         serial_init(0x3f8, env->irq[4], 115200, serial_hds[0]);
 189
 190     if (nd_table[0].vlan)
 191         /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */
 192         mipsnet_init(0x4200, env->irq[2], &nd_table[0]);
 193 }
 194
 195 static QEMUMachine mips_mipssim_machine = {
 196     .name = "mipssim",
 197     .desc = "MIPS MIPSsim platform",
 198     .init = mips_mipssim_init,
 199 };
 200
 201 static void mips_mipssim_machine_init(void)
 202 {
 203     qemu_register_machine(&mips_mipssim_machine);
 204 }
 205
 206 machine_init(mips_mipssim_machine_init);