1 /* 2 * QEMU/mipssim emulation 3 * 4 * Emulates a very simple machine model similar to the one used 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/hw.h" 28 #include "hw/mips/mips.h" 29 #include "hw/mips/cpudevs.h" 30 #include "hw/char/serial.h" 31 #include "hw/isa/isa.h" 32 #include "net/net.h" 33 #include "sysemu/sysemu.h" 34 #include "hw/boards.h" 35 #include "hw/mips/bios.h" 36 #include "hw/loader.h" 37 #include "elf.h" 38 #include "hw/sysbus.h" 39 #include "exec/address-spaces.h" 40 #include "qemu/error-report.h" 41 42 static struct _loaderparams { 43 int ram_size; 44 const char *kernel_filename; 45 const char *kernel_cmdline; 46 const char *initrd_filename; 47 } loaderparams; 48 49 typedef struct ResetData { 50 MIPSCPU *cpu; 51 uint64_t vector; 52 } ResetData; 53 54 static int64_t load_kernel(void) 55 { 56 int64_t entry, kernel_high; 57 long kernel_size; 58 long initrd_size; 59 ram_addr_t initrd_offset; 60 int big_endian; 61 62 #ifdef TARGET_WORDS_BIGENDIAN 63 big_endian = 1; 64 #else 65 big_endian = 0; 66 #endif 67 68 kernel_size = load_elf(loaderparams.kernel_filename, cpu_mips_kseg0_to_phys, 69 NULL, (uint64_t *)&entry, NULL, 70 (uint64_t *)&kernel_high, big_endian, 71 ELF_MACHINE, 1); 72 if (kernel_size >= 0) { 73 if ((entry & ~0x7fffffffULL) == 0x80000000) 74 entry = (int32_t)entry; 75 } else { 76 fprintf(stderr, "qemu: could not load kernel '%s'\n", 77 loaderparams.kernel_filename); 78 exit(1); 79 } 80 81 /* load initrd */ 82 initrd_size = 0; 83 initrd_offset = 0; 84 if (loaderparams.initrd_filename) { 85 initrd_size = get_image_size (loaderparams.initrd_filename); 86 if (initrd_size > 0) { 87 initrd_offset = (kernel_high + ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK; 88 if (initrd_offset + initrd_size > loaderparams.ram_size) { 89 fprintf(stderr, 90 "qemu: memory too small for initial ram disk '%s'\n", 91 loaderparams.initrd_filename); 92 exit(1); 93 } 94 initrd_size = load_image_targphys(loaderparams.initrd_filename, 95 initrd_offset, loaderparams.ram_size - initrd_offset); 96 } 97 if (initrd_size == (target_ulong) -1) { 98 fprintf(stderr, "qemu: could not load initial ram disk '%s'\n", 99 loaderparams.initrd_filename); 100 exit(1); 101 } 102 } 103 return entry; 104 } 105 106 static void main_cpu_reset(void *opaque) 107 { 108 ResetData *s = (ResetData *)opaque; 109 CPUMIPSState *env = &s->cpu->env; 110 111 cpu_reset(CPU(s->cpu)); 112 env->active_tc.PC = s->vector & ~(target_ulong)1; 113 if (s->vector & 1) { 114 env->hflags |= MIPS_HFLAG_M16; 115 } 116 } 117 118 static void mipsnet_init(int base, qemu_irq irq, NICInfo *nd) 119 { 120 DeviceState *dev; 121 SysBusDevice *s; 122 123 dev = qdev_create(NULL, "mipsnet"); 124 qdev_set_nic_properties(dev, nd); 125 qdev_init_nofail(dev); 126 127 s = SYS_BUS_DEVICE(dev); 128 sysbus_connect_irq(s, 0, irq); 129 memory_region_add_subregion(get_system_io(), 130 base, 131 sysbus_mmio_get_region(s, 0)); 132 } 133 134 static void 135 mips_mipssim_init(QEMUMachineInitArgs *args) 136 { 137 ram_addr_t ram_size = args->ram_size; 138 const char *cpu_model = args->cpu_model; 139 const char *kernel_filename = args->kernel_filename; 140 const char *kernel_cmdline = args->kernel_cmdline; 141 const char *initrd_filename = args->initrd_filename; 142 char *filename; 143 MemoryRegion *address_space_mem = get_system_memory(); 144 MemoryRegion *isa = g_new(MemoryRegion, 1); 145 MemoryRegion *ram = g_new(MemoryRegion, 1); 146 MemoryRegion *bios = g_new(MemoryRegion, 1); 147 MIPSCPU *cpu; 148 CPUMIPSState *env; 149 ResetData *reset_info; 150 int bios_size; 151 152 /* Init CPUs. */ 153 if (cpu_model == NULL) { 154 #ifdef TARGET_MIPS64 155 cpu_model = "5Kf"; 156 #else 157 cpu_model = "24Kf"; 158 #endif 159 } 160 cpu = cpu_mips_init(cpu_model); 161 if (cpu == NULL) { 162 fprintf(stderr, "Unable to find CPU definition\n"); 163 exit(1); 164 } 165 env = &cpu->env; 166 167 reset_info = g_malloc0(sizeof(ResetData)); 168 reset_info->cpu = cpu; 169 reset_info->vector = env->active_tc.PC; 170 qemu_register_reset(main_cpu_reset, reset_info); 171 172 /* Allocate RAM. */ 173 memory_region_init_ram(ram, NULL, "mips_mipssim.ram", ram_size); 174 vmstate_register_ram_global(ram); 175 memory_region_init_ram(bios, NULL, "mips_mipssim.bios", BIOS_SIZE); 176 vmstate_register_ram_global(bios); 177 memory_region_set_readonly(bios, true); 178 179 memory_region_add_subregion(address_space_mem, 0, ram); 180 181 /* Map the BIOS / boot exception handler. */ 182 memory_region_add_subregion(address_space_mem, 0x1fc00000LL, bios); 183 /* Load a BIOS / boot exception handler image. */ 184 if (bios_name == NULL) 185 bios_name = BIOS_FILENAME; 186 filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name); 187 if (filename) { 188 bios_size = load_image_targphys(filename, 0x1fc00000LL, BIOS_SIZE); 189 g_free(filename); 190 } else { 191 bios_size = -1; 192 } 193 if ((bios_size < 0 || bios_size > BIOS_SIZE) && !kernel_filename) { 194 /* Bail out if we have neither a kernel image nor boot vector code. */ 195 error_report("Could not load MIPS bios '%s', and no " 196 "-kernel argument was specified", filename); 197 exit(1); 198 } else { 199 /* We have a boot vector start address. */ 200 env->active_tc.PC = (target_long)(int32_t)0xbfc00000; 201 } 202 203 if (kernel_filename) { 204 loaderparams.ram_size = ram_size; 205 loaderparams.kernel_filename = kernel_filename; 206 loaderparams.kernel_cmdline = kernel_cmdline; 207 loaderparams.initrd_filename = initrd_filename; 208 reset_info->vector = load_kernel(); 209 } 210 211 /* Init CPU internal devices. */ 212 cpu_mips_irq_init_cpu(env); 213 cpu_mips_clock_init(env); 214 215 /* Register 64 KB of ISA IO space at 0x1fd00000. */ 216 memory_region_init_alias(isa, NULL, "isa_mmio", 217 get_system_io(), 0, 0x00010000); 218 memory_region_add_subregion(get_system_memory(), 0x1fd00000, isa); 219 220 /* A single 16450 sits at offset 0x3f8. It is attached to 221 MIPS CPU INT2, which is interrupt 4. */ 222 if (serial_hds[0]) 223 serial_init(0x3f8, env->irq[4], 115200, serial_hds[0], 224 get_system_io()); 225 226 if (nd_table[0].used) 227 /* MIPSnet uses the MIPS CPU INT0, which is interrupt 2. */ 228 mipsnet_init(0x4200, env->irq[2], &nd_table[0]); 229 } 230 231 static QEMUMachine mips_mipssim_machine = { 232 .name = "mipssim", 233 .desc = "MIPS MIPSsim platform", 234 .init = mips_mipssim_init, 235 DEFAULT_MACHINE_OPTIONS, 236 }; 237 238 static void mips_mipssim_machine_init(void) 239 { 240 qemu_register_machine(&mips_mipssim_machine); 241 } 242 243 machine_init(mips_mipssim_machine_init); 244