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