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