/* * Raspberry Pi emulation (c) 2012 Gregory Estrade * Upstreaming code cleanup [including bcm2835_*] (c) 2013 Jan Petrous * * Rasperry Pi 2 emulation Copyright (c) 2015, Microsoft * Written by Andrew Baumann * * This code is licensed under the GNU GPLv2 and later. */ #include "qemu/osdep.h" #include "hw/arm/bcm2836.h" #include "qemu/error-report.h" #include "hw/boards.h" #include "hw/loader.h" #include "hw/arm/arm.h" #include "sysemu/sysemu.h" #define SMPBOOT_ADDR 0x300 /* this should leave enough space for ATAGS */ #define MVBAR_ADDR 0x400 /* secure vectors */ #define BOARDSETUP_ADDR (MVBAR_ADDR + 0x20) /* board setup code */ #define FIRMWARE_ADDR 0x8000 /* Pi loads kernel.img here by default */ /* Table of Linux board IDs for different Pi versions */ static const int raspi_boardid[] = {[1] = 0xc42, [2] = 0xc43}; typedef struct RasPiState { BCM2836State soc; MemoryRegion ram; } RasPiState; static void write_smpboot(ARMCPU *cpu, const struct arm_boot_info *info) { static const uint32_t smpboot[] = { 0xe1a0e00f, /* mov lr, pc */ 0xe3a0fe00 + (BOARDSETUP_ADDR >> 4), /* mov pc, BOARDSETUP_ADDR */ 0xee100fb0, /* mrc p15, 0, r0, c0, c0, 5;get core ID */ 0xe7e10050, /* ubfx r0, r0, #0, #2 ;extract LSB */ 0xe59f5014, /* ldr r5, =0x400000CC ;load mbox base */ 0xe320f001, /* 1: yield */ 0xe7953200, /* ldr r3, [r5, r0, lsl #4] ;read mbox for our core*/ 0xe3530000, /* cmp r3, #0 ;spin while zero */ 0x0afffffb, /* beq 1b */ 0xe7853200, /* str r3, [r5, r0, lsl #4] ;clear mbox */ 0xe12fff13, /* bx r3 ;jump to target */ 0x400000cc, /* (constant: mailbox 3 read/clear base) */ }; /* check that we don't overrun board setup vectors */ QEMU_BUILD_BUG_ON(SMPBOOT_ADDR + sizeof(smpboot) > MVBAR_ADDR); /* check that board setup address is correctly relocated */ QEMU_BUILD_BUG_ON((BOARDSETUP_ADDR & 0xf) != 0 || (BOARDSETUP_ADDR >> 4) >= 0x100); rom_add_blob_fixed("raspi_smpboot", smpboot, sizeof(smpboot), info->smp_loader_start); } static void write_board_setup(ARMCPU *cpu, const struct arm_boot_info *info) { arm_write_secure_board_setup_dummy_smc(cpu, info, MVBAR_ADDR); } static void reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info) { CPUState *cs = CPU(cpu); cpu_set_pc(cs, info->smp_loader_start); } static void setup_boot(MachineState *machine, int version, size_t ram_size) { static struct arm_boot_info binfo; int r; binfo.board_id = raspi_boardid[version]; binfo.ram_size = ram_size; binfo.nb_cpus = smp_cpus; binfo.board_setup_addr = BOARDSETUP_ADDR; binfo.write_board_setup = write_board_setup; binfo.secure_board_setup = true; binfo.secure_boot = true; /* Pi2 requires SMP setup */ if (version == 2) { binfo.smp_loader_start = SMPBOOT_ADDR; binfo.write_secondary_boot = write_smpboot; binfo.secondary_cpu_reset_hook = reset_secondary; } /* If the user specified a "firmware" image (e.g. UEFI), we bypass * the normal Linux boot process */ if (machine->firmware) { /* load the firmware image (typically kernel.img) */ r = load_image_targphys(machine->firmware, FIRMWARE_ADDR, ram_size - FIRMWARE_ADDR); if (r < 0) { error_report("Failed to load firmware from %s", machine->firmware); exit(1); } binfo.entry = FIRMWARE_ADDR; binfo.firmware_loaded = true; } else { binfo.kernel_filename = machine->kernel_filename; binfo.kernel_cmdline = machine->kernel_cmdline; binfo.initrd_filename = machine->initrd_filename; } arm_load_kernel(ARM_CPU(first_cpu), &binfo); } static void raspi2_init(MachineState *machine) { RasPiState *s = g_new0(RasPiState, 1); uint32_t vcram_size; DriveInfo *di; BlockBackend *blk; BusState *bus; DeviceState *carddev; object_initialize(&s->soc, sizeof(s->soc), TYPE_BCM2836); object_property_add_child(OBJECT(machine), "soc", OBJECT(&s->soc), &error_abort); /* Allocate and map RAM */ memory_region_allocate_system_memory(&s->ram, OBJECT(machine), "ram", machine->ram_size); /* FIXME: Remove when we have custom CPU address space support */ memory_region_add_subregion_overlap(get_system_memory(), 0, &s->ram, 0); /* Setup the SOC */ object_property_add_const_link(OBJECT(&s->soc), "ram", OBJECT(&s->ram), &error_abort); object_property_set_int(OBJECT(&s->soc), smp_cpus, "enabled-cpus", &error_abort); object_property_set_int(OBJECT(&s->soc), 0xa21041, "board-rev", &error_abort); object_property_set_bool(OBJECT(&s->soc), true, "realized", &error_abort); /* Create and plug in the SD cards */ di = drive_get_next(IF_SD); blk = di ? blk_by_legacy_dinfo(di) : NULL; bus = qdev_get_child_bus(DEVICE(&s->soc), "sd-bus"); if (bus == NULL) { error_report("No SD bus found in SOC object"); exit(1); } carddev = qdev_create(bus, TYPE_SD_CARD); qdev_prop_set_drive(carddev, "drive", blk, &error_fatal); object_property_set_bool(OBJECT(carddev), true, "realized", &error_fatal); vcram_size = object_property_get_int(OBJECT(&s->soc), "vcram-size", &error_abort); setup_boot(machine, 2, machine->ram_size - vcram_size); } static void raspi2_machine_init(MachineClass *mc) { mc->desc = "Raspberry Pi 2"; mc->init = raspi2_init; mc->block_default_type = IF_SD; mc->no_parallel = 1; mc->no_floppy = 1; mc->no_cdrom = 1; mc->max_cpus = BCM2836_NCPUS; /* XXX: Temporary restriction in RAM size from the full 1GB. Since * we do not yet support the framebuffer / GPU, we need to limit * RAM usable by the OS to sit below the peripherals. */ mc->default_ram_size = 0x3F000000; /* BCM2836_PERI_BASE */ }; DEFINE_MACHINE("raspi2", raspi2_machine_init)