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