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 "hw/arm/bcm2836.h"
  12 #include "qemu/error-report.h"
  13 #include "hw/boards.h"
  14 #include "hw/loader.h"
  15 #include "hw/arm/arm.h"
  16 #include "sysemu/sysemu.h"
  17
  18 #define SMPBOOT_ADDR    0x300 /* this should leave enough space for ATAGS */
  19 #define MVBAR_ADDR      0x400 /* secure vectors */
  20 #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */
  21 #define FIRMWARE_ADDR   0x8000 /* Pi loads kernel.img here by default */
  22
  23 /* Table of Linux board IDs for different Pi versions */
  24 static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43};
  25
  26 typedef struct RasPiState {
  27     BCM2836State soc;
  28     MemoryRegion ram;
  29 } RasPiState;
  30
  31 static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info)
  32 {
  33     static const uint32_t smpboot[] = {
  34         0xe1a0e00f, /*    mov     lr, pc */
  35         0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */
  36         0xee100fb0, /*    mrc     p15, 0, r0, c0, c0, 5;get core ID */
  37         0xe7e10050, /*    ubfx    r0, r0, #0, #2       ;extract LSB */
  38         0xe59f5014, /*    ldr     r5, =0x400000CC      ;load mbox base */
  39         0xe320f001, /* 1: yield */
  40         0xe7953200, /*    ldr     r3, [r5, r0, lsl #4] ;read mbox for our core*/
  41         0xe3530000, /*    cmp     r3, #0               ;spin while zero */
  42         0x0afffffb, /*    beq     1b */
  43         0xe7853200, /*    str     r3, [r5, r0, lsl #4] ;clear mbox */
  44         0xe12fff13, /*    bx      r3                   ;jump to target */
  45         0x400000cc, /* (constant: mailbox 3 read/clear base) */
  46     };
  47
  48     /* check that we don't overrun board setup vectors */
  49     QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR);
  50     /* check that board setup address is correctly relocated */
  51     QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0
  52                       || (BOARDSETUP_ADDR >> 4) >= 0x100);
  53
  54     rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot),
  55                        info->smp_loader_start);
  56 }
  57
  58 static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info)
  59 {
  60     arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR);
  61 }
  62
  63 static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info)
  64 {
  65     CPUState *cs = CPU(cpu);
  66     cpu_set_pc(cs, info->smp_loader_start);
  67 }
  68
  69 static void setup_boot(MachineState *machine, int version, size_t ram_size)
  70 {
  71     static struct arm_boot_info binfo;
  72     int r;
  73
  74     binfo.board_id = raspi_boardid[version];
  75     binfo.ram_size = ram_size;
  76     binfo.nb_cpus = smp_cpus;
  77     binfo.board_setup_addr = BOARDSETUP_ADDR;
  78     binfo.write_board_setup = write_board_setup;
  79     binfo.secure_board_setup = true;
  80     binfo.secure_boot = true;
  81
  82     /* Pi2 requires SMP setup */
  83     if (version == 2) {
  84         binfo.smp_loader_start = SMPBOOT_ADDR;
  85         binfo.write_secondary_boot = write_smpboot;
  86         binfo.secondary_cpu_reset_hook = reset_secondary;
  87     }
  88
  89     /* If the user specified a "firmware" image (e.g. UEFI), we bypass
  90      * the normal Linux boot process
  91      */
  92     if (machine->firmware) {
  93         /* load the firmware image (typically kernel.img) */
  94         r = load_image_targphys(machine->firmware, FIRMWARE_ADDR,
  95                                 ram_size - FIRMWARE_ADDR);
  96         if (r < 0) {
  97             error_report("Failed to load firmware from %s", machine->firmware);
  98             exit(1);
  99         }
 100
 101         binfo.entry = FIRMWARE_ADDR;
 102         binfo.firmware_loaded = true;
 103     } else {
 104         binfo.kernel_filename = machine->kernel_filename;
 105         binfo.kernel_cmdline = machine->kernel_cmdline;
 106         binfo.initrd_filename = machine->initrd_filename;
 107     }
 108
 109     arm_load_kernel(ARM_CPU(first_cpu), &binfo);
 110 }
 111
 112 static void raspi2_init(MachineState *machine)
 113 {
 114     RasPiState *s = g_new0(RasPiState, 1);
 115
 116     object_initialize(&s->soc, sizeof(s->soc), TYPE_BCM2836);
 117     object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc),
 118                               &error_abort);
 119
 120     /* Allocate and map RAM */
 121     memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram",
 122                                          machine->ram_size);
 123     /* FIXME: Remove when we have custom CPU address space support */
 124     memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0);
 125
 126     /* Setup the SOC */
 127     object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram),
 128                                    &error_abort);
 129     object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus",
 130                             &error_abort);
 131     object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort);
 132
 133     setup_boot(machine, 2, machine->ram_size);
 134 }
 135
 136 static void raspi2_machine_init(MachineClass *mc)
 137 {
 138     mc->desc = "Raspberry Pi 2";
 139     mc->init = raspi2_init;
 140     mc->block_default_type = IF_SD;
 141     mc->no_parallel = 1;
 142     mc->no_floppy = 1;
 143     mc->no_cdrom = 1;
 144     mc->max_cpus = BCM2836_NCPUS;
 145
 146     /* XXX: Temporary restriction in RAM size from the full 1GB. Since
 147      * we do not yet support the framebuffer / GPU, we need to limit
 148      * RAM usable by the OS to sit below the peripherals.
 149      */
 150     mc->default_ram_size = 0x3F000000; /* BCM2836_PERI_BASE */
 151 };
 152 DEFINE_MACHINE("raspi2", raspi2_machine_init)