hw/rx/rx-gdbsim.c

   1 /*
   2  * RX QEMU GDB simulator
   3  *
   4  * Copyright (c) 2019 Yoshinori Sato
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2 or later, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "qemu/osdep.h"
  20 #include "qemu/cutils.h"
  21 #include "qemu/error-report.h"
  22 #include "qemu/guest-random.h"
  23 #include "qemu/units.h"
  24 #include "qapi/error.h"
  25 #include "hw/loader.h"
  26 #include "hw/rx/rx62n.h"
  27 #include "sysemu/qtest.h"
  28 #include "sysemu/device_tree.h"
  29 #include "sysemu/reset.h"
  30 #include "hw/boards.h"
  31 #include "qom/object.h"
  32
  33 /* Same address of GDB integrated simulator */
  34 #define SDRAM_BASE  EXT_CS_BASE
  35
  36 struct RxGdbSimMachineClass {
  37     /*< private >*/
  38     MachineClass parent_class;
  39     /*< public >*/
  40     const char *mcu_name;
  41     uint32_t xtal_freq_hz;
  42 };
  43 typedef struct RxGdbSimMachineClass RxGdbSimMachineClass;
  44
  45 struct RxGdbSimMachineState {
  46     /*< private >*/
  47     MachineState parent_obj;
  48     /*< public >*/
  49     RX62NState mcu;
  50 };
  51 typedef struct RxGdbSimMachineState RxGdbSimMachineState;
  52
  53 #define TYPE_RX_GDBSIM_MACHINE MACHINE_TYPE_NAME("rx62n-common")
  54
  55 DECLARE_OBJ_CHECKERS(RxGdbSimMachineState, RxGdbSimMachineClass,
  56                      RX_GDBSIM_MACHINE, TYPE_RX_GDBSIM_MACHINE)
  57
  58
  59 static void rx_load_image(RXCPU *cpu, const char *filename,
  60                           uint32_t start, uint32_t size)
  61 {
  62     static uint32_t extable[32];
  63     long kernel_size;
  64     int i;
  65
  66     kernel_size = load_image_targphys(filename, start, size);
  67     if (kernel_size < 0) {
  68         fprintf(stderr, "qemu: could not load kernel '%s'\n", filename);
  69         exit(1);
  70     }
  71     cpu->env.pc = start;
  72
  73     /* setup exception trap trampoline */
  74     /* linux kernel only works little-endian mode */
  75     for (i = 0; i < ARRAY_SIZE(extable); i++) {
  76         extable[i] = cpu_to_le32(0x10 + i * 4);
  77     }
  78     rom_add_blob_fixed("extable", extable, sizeof(extable), VECTOR_TABLE_BASE);
  79 }
  80
  81 static void rx_gdbsim_init(MachineState *machine)
  82 {
  83     MachineClass *mc = MACHINE_GET_CLASS(machine);
  84     RxGdbSimMachineState *s = RX_GDBSIM_MACHINE(machine);
  85     RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_GET_CLASS(machine);
  86     MemoryRegion *sysmem = get_system_memory();
  87     const char *kernel_filename = machine->kernel_filename;
  88     const char *dtb_filename = machine->dtb;
  89     uint8_t rng_seed[32];
  90
  91     if (machine->ram_size < mc->default_ram_size) {
  92         char *sz = size_to_str(mc->default_ram_size);
  93         error_report("Invalid RAM size, should be more than %s", sz);
  94         g_free(sz);
  95         exit(1);
  96     }
  97
  98     /* Allocate memory space */
  99     memory_region_add_subregion(sysmem, SDRAM_BASE, machine->ram);
 100
 101     /* Initialize MCU */
 102     object_initialize_child(OBJECT(machine), "mcu", &s->mcu, rxc->mcu_name);
 103     object_property_set_link(OBJECT(&s->mcu), "main-bus", OBJECT(sysmem),
 104                              &error_abort);
 105     object_property_set_uint(OBJECT(&s->mcu), "xtal-frequency-hz",
 106                              rxc->xtal_freq_hz, &error_abort);
 107     object_property_set_bool(OBJECT(&s->mcu), "load-kernel",
 108                              kernel_filename != NULL, &error_abort);
 109
 110     if (!kernel_filename) {
 111         if (machine->firmware) {
 112             rom_add_file_fixed(machine->firmware, RX62N_CFLASH_BASE, 0);
 113         } else if (!qtest_enabled()) {
 114             error_report("No bios or kernel specified");
 115             exit(1);
 116         }
 117     }
 118
 119     qdev_realize(DEVICE(&s->mcu), NULL, &error_abort);
 120
 121     /* Load kernel and dtb */
 122     if (kernel_filename) {
 123         ram_addr_t kernel_offset;
 124
 125         /*
 126          * The kernel image is loaded into
 127          * the latter half of the SDRAM space.
 128          */
 129         kernel_offset = machine->ram_size / 2;
 130         rx_load_image(RX_CPU(first_cpu), kernel_filename,
 131                       SDRAM_BASE + kernel_offset, kernel_offset);
 132         if (dtb_filename) {
 133             ram_addr_t dtb_offset;
 134             int dtb_size;
 135             g_autofree void *dtb = load_device_tree(dtb_filename, &dtb_size);
 136
 137             if (dtb == NULL) {
 138                 error_report("Couldn't open dtb file %s", dtb_filename);
 139                 exit(1);
 140             }
 141             if (machine->kernel_cmdline &&
 142                 qemu_fdt_setprop_string(dtb, "/chosen", "bootargs",
 143                                         machine->kernel_cmdline) < 0) {
 144                 error_report("Couldn't set /chosen/bootargs");
 145                 exit(1);
 146             }
 147             qemu_guest_getrandom_nofail(rng_seed, sizeof(rng_seed));
 148             qemu_fdt_setprop(dtb, "/chosen", "rng-seed", rng_seed, sizeof(rng_seed));
 149             /* DTB is located at the end of SDRAM space. */
 150             dtb_offset = ROUND_DOWN(machine->ram_size - dtb_size, 16);
 151             rom_add_blob_fixed("dtb", dtb, dtb_size,
 152                                SDRAM_BASE + dtb_offset);
 153             qemu_register_reset_nosnapshotload(qemu_fdt_randomize_seeds,
 154                                 rom_ptr(SDRAM_BASE + dtb_offset, dtb_size));
 155             /* Set dtb address to R1 */
 156             RX_CPU(first_cpu)->env.regs[1] = SDRAM_BASE + dtb_offset;
 157         }
 158     }
 159 }
 160
 161 static void rx_gdbsim_class_init(ObjectClass *oc, void *data)
 162 {
 163     MachineClass *mc = MACHINE_CLASS(oc);
 164
 165     mc->init = rx_gdbsim_init;
 166     mc->default_cpu_type = TYPE_RX62N_CPU;
 167     mc->default_ram_size = 16 * MiB;
 168     mc->default_ram_id = "ext-sdram";
 169 }
 170
 171 static void rx62n7_class_init(ObjectClass *oc, void *data)
 172 {
 173     RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_CLASS(oc);
 174     MachineClass *mc = MACHINE_CLASS(oc);
 175
 176     rxc->mcu_name = TYPE_R5F562N7_MCU;
 177     rxc->xtal_freq_hz = 12 * 1000 * 1000;
 178     mc->desc = "gdb simulator (R5F562N7 MCU and external RAM)";
 179 };
 180
 181 static void rx62n8_class_init(ObjectClass *oc, void *data)
 182 {
 183     RxGdbSimMachineClass *rxc = RX_GDBSIM_MACHINE_CLASS(oc);
 184     MachineClass *mc = MACHINE_CLASS(oc);
 185
 186     rxc->mcu_name = TYPE_R5F562N8_MCU;
 187     rxc->xtal_freq_hz = 12 * 1000 * 1000;
 188     mc->desc = "gdb simulator (R5F562N8 MCU and external RAM)";
 189 };
 190
 191 static const TypeInfo rx_gdbsim_types[] = {
 192     {
 193         .name           = MACHINE_TYPE_NAME("gdbsim-r5f562n7"),
 194         .parent         = TYPE_RX_GDBSIM_MACHINE,
 195         .class_init     = rx62n7_class_init,
 196     }, {
 197         .name           = MACHINE_TYPE_NAME("gdbsim-r5f562n8"),
 198         .parent         = TYPE_RX_GDBSIM_MACHINE,
 199         .class_init     = rx62n8_class_init,
 200     }, {
 201         .name           = TYPE_RX_GDBSIM_MACHINE,
 202         .parent         = TYPE_MACHINE,
 203         .instance_size  = sizeof(RxGdbSimMachineState),
 204         .class_size     = sizeof(RxGdbSimMachineClass),
 205         .class_init     = rx_gdbsim_class_init,
 206         .abstract       = true,
 207      }
 208 };
 209
 210 DEFINE_TYPES(rx_gdbsim_types)