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) 171