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_uint(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) 173