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
  28 #include "qemu/osdep.h"
  29 #include "qemu/error-report.h"
  30 #include "qapi/error.h"
  31 #include "cpu.h"
  32 #include "hw/sysbus.h"
  33 #include "net/net.h"
  34 #include "sysemu/reset.h"
  35 #include "sysemu/sysemu.h"
  36 #include "hw/boards.h"
  37 #include "hw/loader.h"
  38 #include "hw/char/serial.h"
  39 #include "exec/address-spaces.h"
  40 #include "elf.h"
  41
  42 #define PHYS_MEM_BASE 0x80000000
  43 #define FIRMWARE_BASE 0x1000
  44 #define FIRMWARE_SIZE (128 * 0x1000)
  45
  46 typedef struct {
  47     uint64_t ram_size;
  48     const char *kernel_filename;
  49     const char *kernel_cmdline;
  50     const char *initrd_filename;
  51 } LoaderParams;
  52
  53 static void load_kernel(MoxieCPU *cpu, LoaderParams *loader_params)
  54 {
  55     uint64_t entry, kernel_high;
  56     int64_t initrd_size;
  57     long kernel_size;
  58     ram_addr_t initrd_offset;
  59
  60     kernel_size = load_elf(loader_params->kernel_filename,  NULL, NULL, NULL,
  61                            &entry, NULL, &kernel_high, NULL, 1, EM_MOXIE,
  62                            0, 0);
  63
  64     if (kernel_size <= 0) {
  65         error_report("could not load kernel '%s'",
  66                      loader_params->kernel_filename);
  67         exit(1);
  68     }
  69
  70     /* load initrd */
  71     initrd_size = 0;
  72     initrd_offset = 0;
  73     if (loader_params->initrd_filename) {
  74         initrd_size = get_image_size(loader_params->initrd_filename);
  75         if (initrd_size > 0) {
  76             initrd_offset = (kernel_high + ~TARGET_PAGE_MASK)
  77               & TARGET_PAGE_MASK;
  78             if (initrd_offset + initrd_size > loader_params->ram_size) {
  79                 error_report("memory too small for initial ram disk '%s'",
  80                              loader_params->initrd_filename);
  81                 exit(1);
  82             }
  83             initrd_size = load_image_targphys(loader_params->initrd_filename,
  84                                               initrd_offset,
  85                                               loader_params->ram_size);
  86         }
  87         if (initrd_size == (target_ulong)-1) {
  88             error_report("could not load initial ram disk '%s'",
  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 *kernel_filename = machine->kernel_filename;
 107     const char *kernel_cmdline = machine->kernel_cmdline;
 108     const char *initrd_filename = machine->initrd_filename;
 109     CPUMoxieState *env;
 110     MemoryRegion *address_space_mem = get_system_memory();
 111     MemoryRegion *ram = g_new(MemoryRegion, 1);
 112     MemoryRegion *rom = g_new(MemoryRegion, 1);
 113     hwaddr ram_base = 0x200000;
 114     LoaderParams loader_params;
 115
 116     /* Init CPUs. */
 117     cpu = MOXIE_CPU(cpu_create(machine->cpu_type));
 118     env = &cpu->env;
 119
 120     qemu_register_reset(main_cpu_reset, cpu);
 121
 122     /* Allocate RAM. */
 123     memory_region_init_ram(ram, NULL, "moxiesim.ram", ram_size, &error_fatal);
 124     memory_region_add_subregion(address_space_mem, ram_base, ram);
 125
 126     memory_region_init_ram(rom, NULL, "moxie.rom", FIRMWARE_SIZE, &error_fatal);
 127     memory_region_add_subregion(get_system_memory(), FIRMWARE_BASE, rom);
 128
 129     if (kernel_filename) {
 130         loader_params.ram_size = ram_size;
 131         loader_params.kernel_filename = kernel_filename;
 132         loader_params.kernel_cmdline = kernel_cmdline;
 133         loader_params.initrd_filename = initrd_filename;
 134         load_kernel(cpu, &loader_params);
 135     }
 136     if (machine->firmware) {
 137         if (load_image_targphys(machine->firmware, FIRMWARE_BASE, FIRMWARE_SIZE) < 0) {
 138             error_report("Failed to load firmware '%s'", machine->firmware);
 139         }
 140     }
 141
 142     /* A single 16450 sits at offset 0x3f8.  */
 143     if (serial_hd(0)) {
 144         serial_mm_init(address_space_mem, 0x3f8, 0, env->irq[4],
 145                        8000000/16, serial_hd(0), DEVICE_LITTLE_ENDIAN);
 146     }
 147 }
 148
 149 static void moxiesim_machine_init(MachineClass *mc)
 150 {
 151     mc->desc = "Moxie simulator platform";
 152     mc->init = moxiesim_init;
 153     mc->is_default = true;
 154     mc->default_cpu_type = MOXIE_CPU_TYPE_NAME("MoxieLite");
 155 }
 156
 157 DEFINE_MACHINE("moxiesim", moxiesim_machine_init)