hw/moxie/moxiesim.c

   1 /*
   2  * QEMU/moxiesim emulation
   3  *
   4  * Emulates a very simple machine model similar to the one used by the
   5  * GDB moxie simulator.
   6  *
   7  * Copyright (c) 2008, 2009, 2010, 2013 Anthony Green
   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/sysbus.h"
  28 #include "hw/hw.h"
  29 #include "hw/i386/pc.h"
  30 #include "hw/isa/isa.h"
  31 #include "net/net.h"
  32 #include "sysemu/sysemu.h"
  33 #include "hw/boards.h"
  34 #include "hw/loader.h"
  35 #include "hw/char/serial.h"
  36 #include "exec/address-spaces.h"
  37
  38 #define PHYS_MEM_BASE 0x80000000
  39
  40 typedef struct {
  41     uint64_t ram_size;
  42     const char *kernel_filename;
  43     const char *kernel_cmdline;
  44     const char *initrd_filename;
  45 } LoaderParams;
  46
  47 static void load_kernel(MoxieCPU *cpu, LoaderParams *loader_params)
  48 {
  49     uint64_t entry, kernel_low, kernel_high;
  50     long kernel_size;
  51     long initrd_size;
  52     ram_addr_t initrd_offset;
  53
  54     kernel_size = load_elf(loader_params->kernel_filename,  NULL, NULL,
  55                            &entry, &kernel_low, &kernel_high, 1,
  56                            ELF_MACHINE, 0);
  57
  58     if (kernel_size <= 0) {
  59         fprintf(stderr, "qemu: could not load kernel '%s'\n",
  60                 loader_params->kernel_filename);
  61         exit(1);
  62     }
  63
  64     /* load initrd */
  65     initrd_size = 0;
  66     initrd_offset = 0;
  67     if (loader_params->initrd_filename) {
  68         initrd_size = get_image_size(loader_params->initrd_filename);
  69         if (initrd_size > 0) {
  70             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK)
  71               & TARGET_PAGE_MASK;
  72             if (initrd_offset + initrd_size > loader_params->ram_size) {
  73                 fprintf(stderr,
  74                         "qemu: memory too small for initial ram disk '%s'\n",
  75                         loader_params->initrd_filename);
  76                 exit(1);
  77             }
  78             initrd_size = load_image_targphys(loader_params->initrd_filename,
  79                                               initrd_offset,
  80                                               ram_size);
  81         }
  82         if (initrd_size == (target_ulong)-1) {
  83             fprintf(stderr, "qemu: could not load initial ram disk '%s'\n",
  84                     loader_params->initrd_filename);
  85             exit(1);
  86         }
  87     }
  88 }
  89
  90 static void main_cpu_reset(void *opaque)
  91 {
  92     MoxieCPU *cpu = opaque;
  93
  94     cpu_reset(CPU(cpu));
  95 }
  96
  97 static void moxiesim_init(MachineState *machine)
  98 {
  99     MoxieCPU *cpu = NULL;
 100     ram_addr_t ram_size = machine->ram_size;
 101     const char *cpu_model = machine->cpu_model;
 102     const char *kernel_filename = machine->kernel_filename;
 103     const char *kernel_cmdline = machine->kernel_cmdline;
 104     const char *initrd_filename = machine->initrd_filename;
 105     CPUMoxieState *env;
 106     MemoryRegion *address_space_mem = get_system_memory();
 107     MemoryRegion *ram = g_new(MemoryRegion, 1);
 108     MemoryRegion *rom = g_new(MemoryRegion, 1);
 109     hwaddr ram_base = 0x200000;
 110     LoaderParams loader_params;
 111
 112     /* Init CPUs. */
 113     if (cpu_model == NULL) {
 114         cpu_model = "MoxieLite-moxie-cpu";
 115     }
 116     cpu = cpu_moxie_init(cpu_model);
 117     if (!cpu) {
 118         fprintf(stderr, "Unable to find CPU definition\n");
 119         exit(1);
 120     }
 121     env = &cpu->env;
 122
 123     qemu_register_reset(main_cpu_reset, cpu);
 124
 125     /* Allocate RAM. */
 126     memory_region_init_ram(ram, NULL, "moxiesim.ram", ram_size);
 127     vmstate_register_ram_global(ram);
 128     memory_region_add_subregion(address_space_mem, ram_base, ram);
 129
 130     memory_region_init_ram(rom, NULL, "moxie.rom", 128*0x1000);
 131     vmstate_register_ram_global(rom);
 132     memory_region_add_subregion(get_system_memory(), 0x1000, rom);
 133
 134     if (kernel_filename) {
 135         loader_params.ram_size = ram_size;
 136         loader_params.kernel_filename = kernel_filename;
 137         loader_params.kernel_cmdline = kernel_cmdline;
 138         loader_params.initrd_filename = initrd_filename;
 139         load_kernel(cpu, &loader_params);
 140     }
 141
 142     /* A single 16450 sits at offset 0x3f8.  */
 143     if (serial_hds[0]) {
 144         serial_mm_init(address_space_mem, 0x3f8, 0, env->irq[4],
 145                        8000000/16, serial_hds[0], DEVICE_LITTLE_ENDIAN);
 146     }
 147 }
 148
 149 static QEMUMachine moxiesim_machine = {
 150     .name = "moxiesim",
 151     .desc = "Moxie simulator platform",
 152     .init = moxiesim_init,
 153     .is_default = 1,
 154 };
 155
 156 static void moxie_machine_init(void)
 157 {
 158     qemu_register_machine(&moxiesim_machine);
 159 }
 160
 161 machine_init(moxie_machine_init)