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) 153