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  * Raspberry Pi 3 emulation Copyright (c) 2018 Zoltán Baldaszti
   9  * Upstream code cleanup (c) 2018 Pekka Enberg
  10  *
  11  * This code is licensed under the GNU GPLv2 and later.
  12  */
  13
  14 #include "qemu/osdep.h"
  15 #include "qemu/units.h"
  16 #include "qapi/error.h"
  17 #include "cpu.h"
  18 #include "hw/arm/bcm2836.h"
  19 #include "qemu/error-report.h"
  20 #include "hw/boards.h"
  21 #include "hw/loader.h"
  22 #include "hw/arm/boot.h"
  23 #include "sysemu/sysemu.h"
  24
  25 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  26 #define MVBAR_ADDR      0x400 /* secure vectors */
  27 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  28 #define FIRMWARE_ADDR_2 0x8000 /* Pi 2 loads kernel.img here by default */
  29 #define FIRMWARE_ADDR_3 0x80000 /* Pi 3 loads kernel.img here by default */
  30 #define SPINTABLE_ADDR  0xd8 /* Pi 3 bootloader spintable */
  31
  32 /* Table of Linux board IDs for different Pi versions */
  33 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43, [3] = 0xc44};
  34
  35 typedef struct RasPiState {
  36     BCM283XState soc;
  37     MemoryRegion ram;
  38 } RasPiState;
  39
  40 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  41 {
  42     static const uint32_t smpboot[] = {
  43         0xe1a0e00f, /*    mov     lr, pc */
  44         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  45         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  46         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  47         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  48         0xe320f001, /* 1: yield */
  49         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  50         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  51         0x0afffffb, /*    beq     1b */
  52         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  53         0xe12fff13, /*    bx      r3                   ;jump to target */
  54         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  55     };
  56
  57     /* check that we don't overrun board setup vectors */
  58     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  59     /* check that board setup address is correctly relocated */
  60     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  61                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  62
  63     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  64                        info->smp_loader_start);
  65 }
  66
  67 static void write_smpboot64(ARMCPU *cpu, const struct arm_boot_info *info)
  68 {
  69     /* Unlike the AArch32 version we don't need to call the board setup hook.
  70      * The mechanism for doing the spin-table is also entirely different.
  71      * We must have four 64-bit fields at absolute addresses
  72      * 0xd8, 0xe0, 0xe8, 0xf0 in RAM, which are the flag variables for
  73      * our CPUs, and which we must ensure are zero initialized before
  74      * the primary CPU goes into the kernel. We put these variables inside
  75      * a rom blob, so that the reset for ROM contents zeroes them for us.
  76      */
  77     static const uint32_t smpboot[] = {
  78         0xd2801b05, /*        mov     x5, 0xd8 */
  79         0xd53800a6, /*        mrs     x6, mpidr_el1 */
  80         0x924004c6, /*        and     x6, x6, #0x3 */
  81         0xd503205f, /* spin:  wfe */
  82         0xf86678a4, /*        ldr     x4, [x5,x6,lsl #3] */
  83         0xb4ffffc4, /*        cbz     x4, spin */
  84         0xd2800000, /*        mov     x0, #0x0 */
  85         0xd2800001, /*        mov     x1, #0x0 */
  86         0xd2800002, /*        mov     x2, #0x0 */
  87         0xd2800003, /*        mov     x3, #0x0 */
  88         0xd61f0080, /*        br      x4 */
  89     };
  90
  91     static const uint64_t spintables[] = {
  92         0, 0, 0, 0
  93     };
  94
  95     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  96                        info->smp_loader_start);
  97     rom_add_blob_fixed("raspi_spintables", spintables, sizeof(spintables),
  98                        SPINTABLE_ADDR);
  99 }
 100
 101 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
 102 {
 103     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
 104 }
 105
 106 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
 107 {
 108     CPUState *cs = CPU(cpu);
 109     cpu_set_pc(cs, info->smp_loader_start);
 110 }
 111
 112 static void setup_boot(MachineState *machine, int version, size_t ram_size)
 113 {
 114     static struct arm_boot_info binfo;
 115     int r;
 116
 117     binfo.board_id = raspi_boardid[version];
 118     binfo.ram_size = ram_size;
 119     binfo.nb_cpus = smp_cpus;
 120
 121     if (version <= 2) {
 122         /* The rpi1 and 2 require some custom setup code to run in Secure
 123          * mode before booting a kernel (to set up the SMC vectors so
 124          * that we get a no-op SMC; this is used by Linux to call the
 125          * firmware for some cache maintenance operations.
 126          * The rpi3 doesn't need this.
 127          */
 128         binfo.board_setup_addr = BOARDSETUP_ADDR;
 129         binfo.write_board_setup = write_board_setup;
 130         binfo.secure_board_setup = true;
 131         binfo.secure_boot = true;
 132     }
 133
 134     /* Pi2 and Pi3 requires SMP setup */
 135     if (version >= 2) {
 136         binfo.smp_loader_start = SMPBOOT_ADDR;
 137         if (version == 2) {
 138             binfo.write_secondary_boot = write_smpboot;
 139         } else {
 140             binfo.write_secondary_boot = write_smpboot64;
 141         }
 142         binfo.secondary_cpu_reset_hook = reset_secondary;
 143     }
 144
 145     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
 146      * the normal Linux boot process
 147      */
 148     if (machine->firmware) {
 149         hwaddr firmware_addr = version == 3 ? FIRMWARE_ADDR_3 : FIRMWARE_ADDR_2;
 150         /* load the firmware image (typically kernel.img) */
 151         r = load_image_targphys(machine->firmware, firmware_addr,
 152                                 ram_size - firmware_addr);
 153         if (r < 0) {
 154             error_report("Failed to load firmware from %s", machine->firmware);
 155             exit(1);
 156         }
 157
 158         binfo.entry = firmware_addr;
 159         binfo.firmware_loaded = true;
 160     } else {
 161         binfo.kernel_filename = machine->kernel_filename;
 162         binfo.kernel_cmdline = machine->kernel_cmdline;
 163         binfo.initrd_filename = machine->initrd_filename;
 164     }
 165
 166     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 167 }
 168
 169 static void raspi_init(MachineState *machine, int version)
 170 {
 171     RasPiState *s = g_new0(RasPiState, 1);
 172     uint32_t vcram_size;
 173     DriveInfo *di;
 174     BlockBackend *blk;
 175     BusState *bus;
 176     DeviceState *carddev;
 177
 178     if (machine->ram_size > 1 * GiB) {
 179         error_report("Requested ram size is too large for this machine: "
 180                      "maximum is 1GB");
 181         exit(1);
 182     }
 183
 184     object_initialize_child(OBJECT(machine), "soc", &s->soc, sizeof(s->soc),
 185                             version == 3 ? TYPE_BCM2837 : TYPE_BCM2836,
 186                             &error_abort, NULL);
 187
 188     /* Allocate and map RAM */
 189     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 190                                          machine->ram_size);
 191     /* FIXME: Remove when we have custom CPU address space support */
 192     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 193
 194     /* Setup the SOC */
 195     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
 196                                    &error_abort);
 197     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
 198                             &error_abort);
 199     int board_rev = version == 3 ? 0xa02082 : 0xa21041;
 200     object_property_set_int(OBJECT(&s->soc), board_rev, "board-rev",
 201                             &error_abort);
 202     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 203
 204     /* Create and plug in the SD cards */
 205     di = drive_get_next(IF_SD);
 206     blk = di ? blk_by_legacy_dinfo(di) : NULL;
 207     bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus");
 208     if (bus == NULL) {
 209         error_report("No SD bus found in SOC object");
 210         exit(1);
 211     }
 212     carddev = qdev_create(bus, TYPE_SD_CARD);
 213     qdev_prop_set_drive(carddev, "drive", blk, &error_fatal);
 214     object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal);
 215
 216     vcram_size = object_property_get_uint(OBJECT(&s->soc), "vcram-size",
 217                                           &error_abort);
 218     setup_boot(machine, version, machine->ram_size - vcram_size);
 219 }
 220
 221 static void raspi2_init(MachineState *machine)
 222 {
 223     raspi_init(machine, 2);
 224 }
 225
 226 static void raspi2_machine_init(MachineClass *mc)
 227 {
 228     mc->desc = "Raspberry Pi 2";
 229     mc->init = raspi2_init;
 230     mc->block_default_type = IF_SD;
 231     mc->no_parallel = 1;
 232     mc->no_floppy = 1;
 233     mc->no_cdrom = 1;
 234     mc->max_cpus = BCM283X_NCPUS;
 235     mc->min_cpus = BCM283X_NCPUS;
 236     mc->default_cpus = BCM283X_NCPUS;
 237     mc->default_ram_size = 1024 * 1024 * 1024;
 238     mc->ignore_memory_transaction_failures = true;
 239 };
 240 DEFINE_MACHINE("raspi2", raspi2_machine_init)
 241
 242 #ifdef TARGET_AARCH64
 243 static void raspi3_init(MachineState *machine)
 244 {
 245     raspi_init(machine, 3);
 246 }
 247
 248 static void raspi3_machine_init(MachineClass *mc)
 249 {
 250     mc->desc = "Raspberry Pi 3";
 251     mc->init = raspi3_init;
 252     mc->block_default_type = IF_SD;
 253     mc->no_parallel = 1;
 254     mc->no_floppy = 1;
 255     mc->no_cdrom = 1;
 256     mc->max_cpus = BCM283X_NCPUS;
 257     mc->min_cpus = BCM283X_NCPUS;
 258     mc->default_cpus = BCM283X_NCPUS;
 259     mc->default_ram_size = 1024 * 1024 * 1024;
 260 }
 261 DEFINE_MACHINE("raspi3", raspi3_machine_init)
 262 #endif