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 "qemu/error-report.h"
  29 #include "qapi/error.h"
  30 #include "qemu-common.h"
  31 #include "cpu.h"
  32 #include "hw/sysbus.h"
  33 #include "hw/hw.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 #define FIRMWARE_BASE 0x1000
  45 #define FIRMWARE_SIZE (128 * 0x1000)
  46
  47 typedef struct {
  48     uint64_t ram_size;
  49     const char *kernel_filename;
  50     const char *kernel_cmdline;
  51     const char *initrd_filename;
  52 } LoaderParams;
  53
  54 static void load_kernel(MoxieCPU *cpu, LoaderParams *loader_params)
  55 {
  56     uint64_t entry, kernel_low, kernel_high;
  57     long kernel_size;
  58     long initrd_size;
  59     ram_addr_t initrd_offset;
  60
  61     kernel_size = load_elf(loader_params->kernel_filename,  NULL, NULL,
  62                            &entry, &kernel_low, &kernel_high, 1, EM_MOXIE,
  63                            0, 0);
  64
  65     if (kernel_size <= 0) {
  66         error_report("could not load kernel '%s'",
  67                      loader_params->kernel_filename);
  68         exit(1);
  69     }
  70
  71     /* load initrd */
  72     initrd_size = 0;
  73     initrd_offset = 0;
  74     if (loader_params->initrd_filename) {
  75         initrd_size = get_image_size(loader_params->initrd_filename);
  76         if (initrd_size > 0) {
  77             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK)
  78               & TARGET_PAGE_MASK;
  79             if (initrd_offset + initrd_size > loader_params->ram_size) {
  80                 error_report("memory too small for initial ram disk '%s'",
  81                              loader_params->initrd_filename);
  82                 exit(1);
  83             }
  84             initrd_size = load_image_targphys(loader_params->initrd_filename,
  85                                               initrd_offset,
  86                                               ram_size);
  87         }
  88         if (initrd_size == (target_ulong)-1) {
  89             error_report("could not load initial ram disk '%s'",
  90                          loader_params->initrd_filename);
  91             exit(1);
  92         }
  93     }
  94 }
  95
  96 static void main_cpu_reset(void *opaque)
  97 {
  98     MoxieCPU *cpu = opaque;
  99
 100     cpu_reset(CPU(cpu));
 101 }
 102
 103 static void moxiesim_init(MachineState *machine)
 104 {
 105     MoxieCPU *cpu = NULL;
 106     ram_addr_t ram_size = machine->ram_size;
 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     cpu = MOXIE_CPU(cpu_create(machine->cpu_type));
 119     env = &cpu->env;
 120
 121     qemu_register_reset(main_cpu_reset, cpu);
 122
 123     /* Allocate RAM. */
 124     memory_region_init_ram(ram, NULL, "moxiesim.ram", ram_size, &error_fatal);
 125     memory_region_add_subregion(address_space_mem, ram_base, ram);
 126
 127     memory_region_init_ram(rom, NULL, "moxie.rom", FIRMWARE_SIZE, &error_fatal);
 128     memory_region_add_subregion(get_system_memory(), FIRMWARE_BASE, rom);
 129
 130     if (kernel_filename) {
 131         loader_params.ram_size = ram_size;
 132         loader_params.kernel_filename = kernel_filename;
 133         loader_params.kernel_cmdline = kernel_cmdline;
 134         loader_params.initrd_filename = initrd_filename;
 135         load_kernel(cpu, &loader_params);
 136     }
 137     if (bios_name) {
 138         if (load_image_targphys(bios_name, FIRMWARE_BASE, FIRMWARE_SIZE) < 0) {
 139             error_report("Failed to load firmware '%s'", bios_name);
 140         }
 141     }
 142
 143     /* A single 16450 sits at offset 0x3f8.  */
 144     if (serial_hd(0)) {
 145         serial_mm_init(address_space_mem, 0x3f8, 0, env->irq[4],
 146                        8000000/16, serial_hd(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     mc->default_cpu_type = MOXIE_CPU_TYPE_NAME("MoxieLite");
 156 }
 157
 158 DEFINE_MACHINE("moxiesim", moxiesim_machine_init)