hw/arm/raspi.c

   1 /*
   2  * Raspberry Pi emulation (c) 2012 Gregory Estrade
   3  * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous
   4  *
   5  * Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft
   6  * Written by Andrew Baumann
   7  *
   8  * This code is licensed under the GNU GPLv2 and later.
   9  */
  10
  11 #include "qemu/osdep.h"
  12 #include "qapi/error.h"
  13 #include "qemu-common.h"
  14 #include "cpu.h"
  15 #include "hw/arm/bcm2836.h"
  16 #include "qemu/error-report.h"
  17 #include "hw/boards.h"
  18 #include "hw/loader.h"
  19 #include "hw/arm/arm.h"
  20 #include "sysemu/sysemu.h"
  21
  22 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  23 #define MVBAR_ADDR      0x400 /* secure vectors */
  24 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  25 #define FIRMWARE_ADDR   0x8000 /* Pi loads kernel.img here by default */
  26
  27 /* Table of Linux board IDs for different Pi versions */
  28 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43};
  29
  30 typedef struct RasPiState {
  31     BCM2836State soc;
  32     MemoryRegion ram;
  33 } RasPiState;
  34
  35 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  36 {
  37     static const uint32_t smpboot[] = {
  38         0xe1a0e00f, /*    mov     lr, pc */
  39         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  40         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  41         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  42         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  43         0xe320f001, /* 1: yield */
  44         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  45         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  46         0x0afffffb, /*    beq     1b */
  47         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  48         0xe12fff13, /*    bx      r3                   ;jump to target */
  49         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  50     };
  51
  52     /* check that we don't overrun board setup vectors */
  53     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  54     /* check that board setup address is correctly relocated */
  55     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  56                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  57
  58     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  59                        info->smp_loader_start);
  60 }
  61
  62 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
  63 {
  64     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
  65 }
  66
  67 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
  68 {
  69     CPUState *cs = CPU(cpu);
  70     cpu_set_pc(cs, info->smp_loader_start);
  71 }
  72
  73 static void setup_boot(MachineState *machine, int version, size_t ram_size)
  74 {
  75     static struct arm_boot_info binfo;
  76     int r;
  77
  78     binfo.board_id = raspi_boardid[version];
  79     binfo.ram_size = ram_size;
  80     binfo.nb_cpus = smp_cpus;
  81     binfo.board_setup_addr = BOARDSETUP_ADDR;
  82     binfo.write_board_setup = write_board_setup;
  83     binfo.secure_board_setup = true;
  84     binfo.secure_boot = true;
  85
  86     /* Pi2 requires SMP setup */
  87     if (version == 2) {
  88         binfo.smp_loader_start = SMPBOOT_ADDR;
  89         binfo.write_secondary_boot = write_smpboot;
  90         binfo.secondary_cpu_reset_hook = reset_secondary;
  91     }
  92
  93     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
  94      * the normal Linux boot process
  95      */
  96     if (machine->firmware) {
  97         /* load the firmware image (typically kernel.img) */
  98         r = load_image_targphys(machine->firmware, FIRMWARE_ADDR,
  99                                 ram_size - FIRMWARE_ADDR);
 100         if (r < 0) {
 101             error_report("Failed to load firmware from %s", machine->firmware);
 102             exit(1);
 103         }
 104
 105         binfo.entry = FIRMWARE_ADDR;
 106         binfo.firmware_loaded = true;
 107     } else {
 108         binfo.kernel_filename = machine->kernel_filename;
 109         binfo.kernel_cmdline = machine->kernel_cmdline;
 110         binfo.initrd_filename = machine->initrd_filename;
 111     }
 112
 113     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 114 }
 115
 116 static void raspi2_init(MachineState *machine)
 117 {
 118     RasPiState *s = g_new0(RasPiState, 1);
 119     uint32_t vcram_size;
 120     DriveInfo *di;
 121     BlockBackend *blk;
 122     BusState *bus;
 123     DeviceState *carddev;
 124
 125     object_initialize(&s->soc, sizeof(s->soc), TYPE_BCM2836);
 126     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 127                               &error_abort);
 128
 129     /* Allocate and map RAM */
 130     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 131                                          machine->ram_size);
 132     /* FIXME: Remove when we have custom CPU address space support */
 133     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 134
 135     /* Setup the SOC */
 136     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
 137                                    &error_abort);
 138     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
 139                             &error_abort);
 140     object_property_set_int(OBJECT(&s->soc), 0xa21041, "board-rev",
 141                             &error_abort);
 142     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 143
 144     /* Create and plug in the SD cards */
 145     di = drive_get_next(IF_SD);
 146     blk = di ? blk_by_legacy_dinfo(di) : NULL;
 147     bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus");
 148     if (bus == NULL) {
 149         error_report("No SD bus found in SOC object");
 150         exit(1);
 151     }
 152     carddev = qdev_create(bus, TYPE_SD_CARD);
 153     qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
 154     object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal);
 155
 156     vcram_size = object_property_get_int(OBJECT(&s->soc), "vcram-size",
 157                                          &error_abort);
 158     setup_boot(machine, 2, machine->ram_size - vcram_size);
 159 }
 160
 161 static void raspi2_machine_init(MachineClass *mc)
 162 {
 163     mc->desc = "Raspberry Pi 2";
 164     mc->init = raspi2_init;
 165     mc->block_default_type = IF_SD;
 166     mc->no_parallel = 1;
 167     mc->no_floppy = 1;
 168     mc->no_cdrom = 1;
 169     mc->max_cpus = BCM2836_NCPUS;
 170     mc->default_ram_size = 1024 * 1024 * 1024;
 171 };
 172 DEFINE_MACHINE("raspi2", raspi2_machine_init)