/* * ARM kernel loader. * * Copyright (c) 2006-2007 CodeSourcery. * Written by Paul Brook * * This code is licensed under the GPL. */ #include "qemu/osdep.h" #include "qemu/error-report.h" #include "qapi/error.h" #include #include "hw/hw.h" #include "hw/arm/arm.h" #include "hw/arm/linux-boot-if.h" #include "sysemu/kvm.h" #include "sysemu/sysemu.h" #include "sysemu/numa.h" #include "hw/boards.h" #include "hw/loader.h" #include "elf.h" #include "sysemu/device_tree.h" #include "qemu/config-file.h" #include "exec/address-spaces.h" /* Kernel boot protocol is specified in the kernel docs * Documentation/arm/Booting and Documentation/arm64/booting.txt * They have different preferred image load offsets from system RAM base. */ #define KERNEL_ARGS_ADDR 0x100 #define KERNEL_LOAD_ADDR 0x00010000 #define KERNEL64_LOAD_ADDR 0x00080000 #define ARM64_TEXT_OFFSET_OFFSET 8 #define ARM64_MAGIC_OFFSET 56 typedef enum { FIXUP_NONE = 0, /* do nothing */ FIXUP_TERMINATOR, /* end of insns */ FIXUP_BOARDID, /* overwrite with board ID number */ FIXUP_BOARD_SETUP, /* overwrite with board specific setup code address */ FIXUP_ARGPTR, /* overwrite with pointer to kernel args */ FIXUP_ENTRYPOINT, /* overwrite with kernel entry point */ FIXUP_GIC_CPU_IF, /* overwrite with GIC CPU interface address */ FIXUP_BOOTREG, /* overwrite with boot register address */ FIXUP_DSB, /* overwrite with correct DSB insn for cpu */ FIXUP_MAX, } FixupType; typedef struct ARMInsnFixup { uint32_t insn; FixupType fixup; } ARMInsnFixup; static const ARMInsnFixup bootloader_aarch64[] = { { 0x580000c0 }, /* ldr x0, arg ; Load the lower 32-bits of DTB */ { 0xaa1f03e1 }, /* mov x1, xzr */ { 0xaa1f03e2 }, /* mov x2, xzr */ { 0xaa1f03e3 }, /* mov x3, xzr */ { 0x58000084 }, /* ldr x4, entry ; Load the lower 32-bits of kernel entry */ { 0xd61f0080 }, /* br x4 ; Jump to the kernel entry point */ { 0, FIXUP_ARGPTR }, /* arg: .word @DTB Lower 32-bits */ { 0 }, /* .word @DTB Higher 32-bits */ { 0, FIXUP_ENTRYPOINT }, /* entry: .word @Kernel Entry Lower 32-bits */ { 0 }, /* .word @Kernel Entry Higher 32-bits */ { 0, FIXUP_TERMINATOR } }; /* A very small bootloader: call the board-setup code (if needed), * set r0-r2, then jump to the kernel. * If we're not calling boot setup code then we don't copy across * the first BOOTLOADER_NO_BOARD_SETUP_OFFSET insns in this array. */ static const ARMInsnFixup bootloader[] = { { 0xe28fe004 }, /* add lr, pc, #4 */ { 0xe51ff004 }, /* ldr pc, [pc, #-4] */ { 0, FIXUP_BOARD_SETUP }, #define BOOTLOADER_NO_BOARD_SETUP_OFFSET 3 { 0xe3a00000 }, /* mov r0, #0 */ { 0xe59f1004 }, /* ldr r1, [pc, #4] */ { 0xe59f2004 }, /* ldr r2, [pc, #4] */ { 0xe59ff004 }, /* ldr pc, [pc, #4] */ { 0, FIXUP_BOARDID }, { 0, FIXUP_ARGPTR }, { 0, FIXUP_ENTRYPOINT }, { 0, FIXUP_TERMINATOR } }; /* Handling for secondary CPU boot in a multicore system. * Unlike the uniprocessor/primary CPU boot, this is platform * dependent. The default code here is based on the secondary * CPU boot protocol used on realview/vexpress boards, with * some parameterisation to increase its flexibility. * QEMU platform models for which this code is not appropriate * should override write_secondary_boot and secondary_cpu_reset_hook * instead. * * This code enables the interrupt controllers for the secondary * CPUs and then puts all the secondary CPUs into a loop waiting * for an interprocessor interrupt and polling a configurable * location for the kernel secondary CPU entry point. */ #define DSB_INSN 0xf57ff04f #define CP15_DSB_INSN 0xee070f9a /* mcr cp15, 0, r0, c7, c10, 4 */ static const ARMInsnFixup smpboot[] = { { 0xe59f2028 }, /* ldr r2, gic_cpu_if */ { 0xe59f0028 }, /* ldr r0, bootreg_addr */ { 0xe3a01001 }, /* mov r1, #1 */ { 0xe5821000 }, /* str r1, [r2] - set GICC_CTLR.Enable */ { 0xe3a010ff }, /* mov r1, #0xff */ { 0xe5821004 }, /* str r1, [r2, 4] - set GIC_PMR.Priority to 0xff */ { 0, FIXUP_DSB }, /* dsb */ { 0xe320f003 }, /* wfi */ { 0xe5901000 }, /* ldr r1, [r0] */ { 0xe1110001 }, /* tst r1, r1 */ { 0x0afffffb }, /* beq */ { 0xe12fff11 }, /* bx r1 */ { 0, FIXUP_GIC_CPU_IF }, /* gic_cpu_if: .word 0x.... */ { 0, FIXUP_BOOTREG }, /* bootreg_addr: .word 0x.... */ { 0, FIXUP_TERMINATOR } }; static void write_bootloader(const char *name, hwaddr addr, const ARMInsnFixup *insns, uint32_t *fixupcontext) { /* Fix up the specified bootloader fragment and write it into * guest memory using rom_add_blob_fixed(). fixupcontext is * an array giving the values to write in for the fixup types * which write a value into the code array. */ int i, len; uint32_t *code; len = 0; while (insns[len].fixup != FIXUP_TERMINATOR) { len++; } code = g_new0(uint32_t, len); for (i = 0; i < len; i++) { uint32_t insn = insns[i].insn; FixupType fixup = insns[i].fixup; switch (fixup) { case FIXUP_NONE: break; case FIXUP_BOARDID: case FIXUP_BOARD_SETUP: case FIXUP_ARGPTR: case FIXUP_ENTRYPOINT: case FIXUP_GIC_CPU_IF: case FIXUP_BOOTREG: case FIXUP_DSB: insn = fixupcontext[fixup]; break; default: abort(); } code[i] = tswap32(insn); } rom_add_blob_fixed(name, code, len * sizeof(uint32_t), addr); g_free(code); } static void default_write_secondary(ARMCPU *cpu, const struct arm_boot_info *info) { uint32_t fixupcontext[FIXUP_MAX]; fixupcontext[FIXUP_GIC_CPU_IF] = info->gic_cpu_if_addr; fixupcontext[FIXUP_BOOTREG] = info->smp_bootreg_addr; if (arm_feature(&cpu->env, ARM_FEATURE_V7)) { fixupcontext[FIXUP_DSB] = DSB_INSN; } else { fixupcontext[FIXUP_DSB] = CP15_DSB_INSN; } write_bootloader("smpboot", info->smp_loader_start, smpboot, fixupcontext); } void arm_write_secure_board_setup_dummy_smc(ARMCPU *cpu, const struct arm_boot_info *info, hwaddr mvbar_addr) { int n; uint32_t mvbar_blob[] = { /* mvbar_addr: secure monitor vectors * Default unimplemented and unused vectors to spin. Makes it * easier to debug (as opposed to the CPU running away). */ 0xeafffffe, /* (spin) */ 0xeafffffe, /* (spin) */ 0xe1b0f00e, /* movs pc, lr ;SMC exception return */ 0xeafffffe, /* (spin) */ 0xeafffffe, /* (spin) */ 0xeafffffe, /* (spin) */ 0xeafffffe, /* (spin) */ 0xeafffffe, /* (spin) */ }; uint32_t board_setup_blob[] = { /* board setup addr */ 0xe3a00e00 + (mvbar_addr >> 4), /* mov r0, #mvbar_addr */ 0xee0c0f30, /* mcr p15, 0, r0, c12, c0, 1 ;set MVBAR */ 0xee110f11, /* mrc p15, 0, r0, c1 , c1, 0 ;read SCR */ 0xe3800031, /* orr r0, #0x31 ;enable AW, FW, NS */ 0xee010f11, /* mcr p15, 0, r0, c1, c1, 0 ;write SCR */ 0xe1a0100e, /* mov r1, lr ;save LR across SMC */ 0xe1600070, /* smc #0 ;call monitor to flush SCR */ 0xe1a0f001, /* mov pc, r1 ;return */ }; /* check that mvbar_addr is correctly aligned and relocatable (using MOV) */ assert((mvbar_addr & 0x1f) == 0 && (mvbar_addr >> 4) < 0x100); /* check that these blobs don't overlap */ assert((mvbar_addr + sizeof(mvbar_blob) <= info->board_setup_addr) || (info->board_setup_addr + sizeof(board_setup_blob) <= mvbar_addr)); for (n = 0; n < ARRAY_SIZE(mvbar_blob); n++) { mvbar_blob[n] = tswap32(mvbar_blob[n]); } rom_add_blob_fixed("board-setup-mvbar", mvbar_blob, sizeof(mvbar_blob), mvbar_addr); for (n = 0; n < ARRAY_SIZE(board_setup_blob); n++) { board_setup_blob[n] = tswap32(board_setup_blob[n]); } rom_add_blob_fixed("board-setup", board_setup_blob, sizeof(board_setup_blob), info->board_setup_addr); } static void default_reset_secondary(ARMCPU *cpu, const struct arm_boot_info *info) { CPUState *cs = CPU(cpu); address_space_stl_notdirty(&address_space_memory, info->smp_bootreg_addr, 0, MEMTXATTRS_UNSPECIFIED, NULL); cpu_set_pc(cs, info->smp_loader_start); } static inline bool have_dtb(const struct arm_boot_info *info) { return info->dtb_filename || info->get_dtb; } #define WRITE_WORD(p, value) do { \ address_space_stl_notdirty(&address_space_memory, p, value, \ MEMTXATTRS_UNSPECIFIED, NULL); \ p += 4; \ } while (0) static void set_kernel_args(const struct arm_boot_info *info) { int initrd_size = info->initrd_size; hwaddr base = info->loader_start; hwaddr p; p = base + KERNEL_ARGS_ADDR; /* ATAG_CORE */ WRITE_WORD(p, 5); WRITE_WORD(p, 0x54410001); WRITE_WORD(p, 1); WRITE_WORD(p, 0x1000); WRITE_WORD(p, 0); /* ATAG_MEM */ /* TODO: handle multiple chips on one ATAG list */ WRITE_WORD(p, 4); WRITE_WORD(p, 0x54410002); WRITE_WORD(p, info->ram_size); WRITE_WORD(p, info->loader_start); if (initrd_size) { /* ATAG_INITRD2 */ WRITE_WORD(p, 4); WRITE_WORD(p, 0x54420005); WRITE_WORD(p, info->initrd_start); WRITE_WORD(p, initrd_size); } if (info->kernel_cmdline && *info->kernel_cmdline) { /* ATAG_CMDLINE */ int cmdline_size; cmdline_size = strlen(info->kernel_cmdline); cpu_physical_memory_write(p + 8, info->kernel_cmdline, cmdline_size + 1); cmdline_size = (cmdline_size >> 2) + 1; WRITE_WORD(p, cmdline_size + 2); WRITE_WORD(p, 0x54410009); p += cmdline_size * 4; } if (info->atag_board) { /* ATAG_BOARD */ int atag_board_len; uint8_t atag_board_buf[0x1000]; atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3; WRITE_WORD(p, (atag_board_len + 8) >> 2); WRITE_WORD(p, 0x414f4d50); cpu_physical_memory_write(p, atag_board_buf, atag_board_len); p += atag_board_len; } /* ATAG_END */ WRITE_WORD(p, 0); WRITE_WORD(p, 0); } static void set_kernel_args_old(const struct arm_boot_info *info) { hwaddr p; const char *s; int initrd_size = info->initrd_size; hwaddr base = info->loader_start; /* see linux/include/asm-arm/setup.h */ p = base + KERNEL_ARGS_ADDR; /* page_size */ WRITE_WORD(p, 4096); /* nr_pages */ WRITE_WORD(p, info->ram_size / 4096); /* ramdisk_size */ WRITE_WORD(p, 0); #define FLAG_READONLY 1 #define FLAG_RDLOAD 4 #define FLAG_RDPROMPT 8 /* flags */ WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT); /* rootdev */ WRITE_WORD(p, (31 << 8) | 0); /* /dev/mtdblock0 */ /* video_num_cols */ WRITE_WORD(p, 0); /* video_num_rows */ WRITE_WORD(p, 0); /* video_x */ WRITE_WORD(p, 0); /* video_y */ WRITE_WORD(p, 0); /* memc_control_reg */ WRITE_WORD(p, 0); /* unsigned char sounddefault */ /* unsigned char adfsdrives */ /* unsigned char bytes_per_char_h */ /* unsigned char bytes_per_char_v */ WRITE_WORD(p, 0); /* pages_in_bank[4] */ WRITE_WORD(p, 0); WRITE_WORD(p, 0); WRITE_WORD(p, 0); WRITE_WORD(p, 0); /* pages_in_vram */ WRITE_WORD(p, 0); /* initrd_start */ if (initrd_size) { WRITE_WORD(p, info->initrd_start); } else { WRITE_WORD(p, 0); } /* initrd_size */ WRITE_WORD(p, initrd_size); /* rd_start */ WRITE_WORD(p, 0); /* system_rev */ WRITE_WORD(p, 0); /* system_serial_low */ WRITE_WORD(p, 0); /* system_serial_high */ WRITE_WORD(p, 0); /* mem_fclk_21285 */ WRITE_WORD(p, 0); /* zero unused fields */ while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) { WRITE_WORD(p, 0); } s = info->kernel_cmdline; if (s) { cpu_physical_memory_write(p, s, strlen(s) + 1); } else { WRITE_WORD(p, 0); } } /** * load_dtb() - load a device tree binary image into memory * @addr: the address to load the image at * @binfo: struct describing the boot environment * @addr_limit: upper limit of the available memory area at @addr * * Load a device tree supplied by the machine or by the user with the * '-dtb' command line option, and put it at offset @addr in target * memory. * * If @addr_limit contains a meaningful value (i.e., it is strictly greater * than @addr), the device tree is only loaded if its size does not exceed * the limit. * * Returns: the size of the device tree image on success, * 0 if the image size exceeds the limit, * -1 on errors. * * Note: Must not be called unless have_dtb(binfo) is true. */ static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo, hwaddr addr_limit) { void *fdt = NULL; int size, rc; uint32_t acells, scells; char *nodename; unsigned int i; hwaddr mem_base, mem_len; if (binfo->dtb_filename) { char *filename; filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, binfo->dtb_filename); if (!filename) { fprintf(stderr, "Couldn't open dtb file %s\n", binfo->dtb_filename); goto fail; } fdt = load_device_tree(filename, &size); if (!fdt) { fprintf(stderr, "Couldn't open dtb file %s\n", filename); g_free(filename); goto fail; } g_free(filename); } else { fdt = binfo->get_dtb(binfo, &size); if (!fdt) { fprintf(stderr, "Board was unable to create a dtb blob\n"); goto fail; } } if (addr_limit > addr && size > (addr_limit - addr)) { /* Installing the device tree blob at addr would exceed addr_limit. * Whether this constitutes failure is up to the caller to decide, * so just return 0 as size, i.e., no error. */ g_free(fdt); return 0; } acells = qemu_fdt_getprop_cell(fdt, "/", "#address-cells", NULL, &error_fatal); scells = qemu_fdt_getprop_cell(fdt, "/", "#size-cells", NULL, &error_fatal); if (acells == 0 || scells == 0) { fprintf(stderr, "dtb file invalid (#address-cells or #size-cells 0)\n"); goto fail; } if (scells < 2 && binfo->ram_size >= (1ULL << 32)) { /* This is user error so deserves a friendlier error message * than the failure of setprop_sized_cells would provide */ fprintf(stderr, "qemu: dtb file not compatible with " "RAM size > 4GB\n"); goto fail; } if (nb_numa_nodes > 0) { /* * Turn the /memory node created before into a NOP node, then create * /memory@addr nodes for all numa nodes respectively. */ qemu_fdt_nop_node(fdt, "/memory"); mem_base = binfo->loader_start; for (i = 0; i < nb_numa_nodes; i++) { mem_len = numa_info[i].node_mem; nodename = g_strdup_printf("/memory@%" PRIx64, mem_base); qemu_fdt_add_subnode(fdt, nodename); qemu_fdt_setprop_string(fdt, nodename, "device_type", "memory"); rc = qemu_fdt_setprop_sized_cells(fdt, nodename, "reg", acells, mem_base, scells, mem_len); if (rc < 0) { fprintf(stderr, "couldn't set %s/reg for node %d\n", nodename, i); goto fail; } qemu_fdt_setprop_cell(fdt, nodename, "numa-node-id", i); mem_base += mem_len; g_free(nodename); } } else { Error *err = NULL; rc = fdt_path_offset(fdt, "/memory"); if (rc < 0) { qemu_fdt_add_subnode(fdt, "/memory"); } if (!qemu_fdt_getprop(fdt, "/memory", "device_type", NULL, &err)) { qemu_fdt_setprop_string(fdt, "/memory", "device_type", "memory"); } rc = qemu_fdt_setprop_sized_cells(fdt, "/memory", "reg", acells, binfo->loader_start, scells, binfo->ram_size); if (rc < 0) { fprintf(stderr, "couldn't set /memory/reg\n"); goto fail; } } rc = fdt_path_offset(fdt, "/chosen"); if (rc < 0) { qemu_fdt_add_subnode(fdt, "/chosen"); } if (binfo->kernel_cmdline && *binfo->kernel_cmdline) { rc = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", binfo->kernel_cmdline); if (rc < 0) { fprintf(stderr, "couldn't set /chosen/bootargs\n"); goto fail; } } if (binfo->initrd_size) { rc = qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-start", binfo->initrd_start); if (rc < 0) { fprintf(stderr, "couldn't set /chosen/linux,initrd-start\n"); goto fail; } rc = qemu_fdt_setprop_cell(fdt, "/chosen", "linux,initrd-end", binfo->initrd_start + binfo->initrd_size); if (rc < 0) { fprintf(stderr, "couldn't set /chosen/linux,initrd-end\n"); goto fail; } } if (binfo->modify_dtb) { binfo->modify_dtb(binfo, fdt); } qemu_fdt_dumpdtb(fdt, size); /* Put the DTB into the memory map as a ROM image: this will ensure * the DTB is copied again upon reset, even if addr points into RAM. */ rom_add_blob_fixed("dtb", fdt, size, addr); g_free(fdt); return size; fail: g_free(fdt); return -1; } static void do_cpu_reset(void *opaque) { ARMCPU *cpu = opaque; CPUState *cs = CPU(cpu); CPUARMState *env = &cpu->env; const struct arm_boot_info *info = env->boot_info; cpu_reset(cs); if (info) { if (!info->is_linux) { int i; /* Jump to the entry point. */ uint64_t entry = info->entry; switch (info->endianness) { case ARM_ENDIANNESS_LE: env->cp15.sctlr_el[1] &= ~SCTLR_E0E; for (i = 1; i < 4; ++i) { env->cp15.sctlr_el[i] &= ~SCTLR_EE; } env->uncached_cpsr &= ~CPSR_E; break; case ARM_ENDIANNESS_BE8: env->cp15.sctlr_el[1] |= SCTLR_E0E; for (i = 1; i < 4; ++i) { env->cp15.sctlr_el[i] |= SCTLR_EE; } env->uncached_cpsr |= CPSR_E; break; case ARM_ENDIANNESS_BE32: env->cp15.sctlr_el[1] |= SCTLR_B; break; case ARM_ENDIANNESS_UNKNOWN: break; /* Board's decision */ default: g_assert_not_reached(); } if (!env->aarch64) { env->thumb = info->entry & 1; entry &= 0xfffffffe; } cpu_set_pc(cs, entry); } else { /* If we are booting Linux then we need to check whether we are * booting into secure or non-secure state and adjust the state * accordingly. Out of reset, ARM is defined to be in secure state * (SCR.NS = 0), we change that here if non-secure boot has been * requested. */ if (arm_feature(env, ARM_FEATURE_EL3)) { /* AArch64 is defined to come out of reset into EL3 if enabled. * If we are booting Linux then we need to adjust our EL as * Linux expects us to be in EL2 or EL1. AArch32 resets into * SVC, which Linux expects, so no privilege/exception level to * adjust. */ if (env->aarch64) { env->cp15.scr_el3 |= SCR_RW; if (arm_feature(env, ARM_FEATURE_EL2)) { env->cp15.hcr_el2 |= HCR_RW; env->pstate = PSTATE_MODE_EL2h; } else { env->pstate = PSTATE_MODE_EL1h; } } /* Set to non-secure if not a secure boot */ if (!info->secure_boot && (cs != first_cpu || !info->secure_board_setup)) { /* Linux expects non-secure state */ env->cp15.scr_el3 |= SCR_NS; } } if (cs == first_cpu) { cpu_set_pc(cs, info->loader_start); if (!have_dtb(info)) { if (old_param) { set_kernel_args_old(info); } else { set_kernel_args(info); } } } else { info->secondary_cpu_reset_hook(cpu, info); } } } } /** * load_image_to_fw_cfg() - Load an image file into an fw_cfg entry identified * by key. * @fw_cfg: The firmware config instance to store the data in. * @size_key: The firmware config key to store the size of the loaded * data under, with fw_cfg_add_i32(). * @data_key: The firmware config key to store the loaded data under, * with fw_cfg_add_bytes(). * @image_name: The name of the image file to load. If it is NULL, the * function returns without doing anything. * @try_decompress: Whether the image should be decompressed (gunzipped) before * adding it to fw_cfg. If decompression fails, the image is * loaded as-is. * * In case of failure, the function prints an error message to stderr and the * process exits with status 1. */ static void load_image_to_fw_cfg(FWCfgState *fw_cfg, uint16_t size_key, uint16_t data_key, const char *image_name, bool try_decompress) { size_t size = -1; uint8_t *data; if (image_name == NULL) { return; } if (try_decompress) { size = load_image_gzipped_buffer(image_name, LOAD_IMAGE_MAX_GUNZIP_BYTES, &data); } if (size == (size_t)-1) { gchar *contents; gsize length; if (!g_file_get_contents(image_name, &contents, &length, NULL)) { error_report("failed to load \"%s\"", image_name); exit(1); } size = length; data = (uint8_t *)contents; } fw_cfg_add_i32(fw_cfg, size_key, size); fw_cfg_add_bytes(fw_cfg, data_key, data, size); } static int do_arm_linux_init(Object *obj, void *opaque) { if (object_dynamic_cast(obj, TYPE_ARM_LINUX_BOOT_IF)) { ARMLinuxBootIf *albif = ARM_LINUX_BOOT_IF(obj); ARMLinuxBootIfClass *albifc = ARM_LINUX_BOOT_IF_GET_CLASS(obj); struct arm_boot_info *info = opaque; if (albifc->arm_linux_init) { albifc->arm_linux_init(albif, info->secure_boot); } } return 0; } static uint64_t arm_load_elf(struct arm_boot_info *info, uint64_t *pentry, uint64_t *lowaddr, uint64_t *highaddr, int elf_machine) { bool elf_is64; union { Elf32_Ehdr h32; Elf64_Ehdr h64; } elf_header; int data_swab = 0; bool big_endian; uint64_t ret = -1; Error *err = NULL; load_elf_hdr(info->kernel_filename, &elf_header, &elf_is64, &err); if (err) { return ret; } if (elf_is64) { big_endian = elf_header.h64.e_ident[EI_DATA] == ELFDATA2MSB; info->endianness = big_endian ? ARM_ENDIANNESS_BE8 : ARM_ENDIANNESS_LE; } else { big_endian = elf_header.h32.e_ident[EI_DATA] == ELFDATA2MSB; if (big_endian) { if (bswap32(elf_header.h32.e_flags) & EF_ARM_BE8) { info->endianness = ARM_ENDIANNESS_BE8; } else { info->endianness = ARM_ENDIANNESS_BE32; /* In BE32, the CPU has a different view of the per-byte * address map than the rest of the system. BE32 ELF files * are organised such that they can be programmed through * the CPU's per-word byte-reversed view of the world. QEMU * however loads ELF files independently of the CPU. So * tell the ELF loader to byte reverse the data for us. */ data_swab = 2; } } else { info->endianness = ARM_ENDIANNESS_LE; } } ret = load_elf(info->kernel_filename, NULL, NULL, pentry, lowaddr, highaddr, big_endian, elf_machine, 1, data_swab); if (ret <= 0) { /* The header loaded but the image didn't */ exit(1); } return ret; } static uint64_t load_aarch64_image(const char *filename, hwaddr mem_base, hwaddr *entry) { hwaddr kernel_load_offset = KERNEL64_LOAD_ADDR; uint8_t *buffer; int size; /* On aarch64, it's the bootloader's job to uncompress the kernel. */ size = load_image_gzipped_buffer(filename, LOAD_IMAGE_MAX_GUNZIP_BYTES, &buffer); if (size < 0) { gsize len; /* Load as raw file otherwise */ if (!g_file_get_contents(filename, (char **)&buffer, &len, NULL)) { return -1; } size = len; } /* check the arm64 magic header value -- very old kernels may not have it */ if (memcmp(buffer + ARM64_MAGIC_OFFSET, "ARM\x64", 4) == 0) { uint64_t hdrvals[2]; /* The arm64 Image header has text_offset and image_size fields at 8 and * 16 bytes into the Image header, respectively. The text_offset field * is only valid if the image_size is non-zero. */ memcpy(&hdrvals, buffer + ARM64_TEXT_OFFSET_OFFSET, sizeof(hdrvals)); if (hdrvals[1] != 0) { kernel_load_offset = le64_to_cpu(hdrvals[0]); } } *entry = mem_base + kernel_load_offset; rom_add_blob_fixed(filename, buffer, size, *entry); g_free(buffer); return size; } static void arm_load_kernel_notify(Notifier *notifier, void *data) { CPUState *cs; int kernel_size; int initrd_size; int is_linux = 0; uint64_t elf_entry, elf_low_addr, elf_high_addr; int elf_machine; hwaddr entry; static const ARMInsnFixup *primary_loader; ArmLoadKernelNotifier *n = DO_UPCAST(ArmLoadKernelNotifier, notifier, notifier); ARMCPU *cpu = n->cpu; struct arm_boot_info *info = container_of(n, struct arm_boot_info, load_kernel_notifier); /* The board code is not supposed to set secure_board_setup unless * running its code in secure mode is actually possible, and KVM * doesn't support secure. */ assert(!(info->secure_board_setup && kvm_enabled())); info->dtb_filename = qemu_opt_get(qemu_get_machine_opts(), "dtb"); /* Load the kernel. */ if (!info->kernel_filename || info->firmware_loaded) { if (have_dtb(info)) { /* If we have a device tree blob, but no kernel to supply it to (or * the kernel is supposed to be loaded by the bootloader), copy the * DTB to the base of RAM for the bootloader to pick up. */ if (load_dtb(info->loader_start, info, 0) < 0) { exit(1); } } if (info->kernel_filename) { FWCfgState *fw_cfg; bool try_decompressing_kernel; fw_cfg = fw_cfg_find(); try_decompressing_kernel = arm_feature(&cpu->env, ARM_FEATURE_AARCH64); /* Expose the kernel, the command line, and the initrd in fw_cfg. * We don't process them here at all, it's all left to the * firmware. */ load_image_to_fw_cfg(fw_cfg, FW_CFG_KERNEL_SIZE, FW_CFG_KERNEL_DATA, info->kernel_filename, try_decompressing_kernel); load_image_to_fw_cfg(fw_cfg, FW_CFG_INITRD_SIZE, FW_CFG_INITRD_DATA, info->initrd_filename, false); if (info->kernel_cmdline) { fw_cfg_add_i32(fw_cfg, FW_CFG_CMDLINE_SIZE, strlen(info->kernel_cmdline) + 1); fw_cfg_add_string(fw_cfg, FW_CFG_CMDLINE_DATA, info->kernel_cmdline); } } /* We will start from address 0 (typically a boot ROM image) in the * same way as hardware. */ return; } if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) { primary_loader = bootloader_aarch64; elf_machine = EM_AARCH64; } else { primary_loader = bootloader; if (!info->write_board_setup) { primary_loader += BOOTLOADER_NO_BOARD_SETUP_OFFSET; } elf_machine = EM_ARM; } if (!info->secondary_cpu_reset_hook) { info->secondary_cpu_reset_hook = default_reset_secondary; } if (!info->write_secondary_boot) { info->write_secondary_boot = default_write_secondary; } if (info->nb_cpus == 0) info->nb_cpus = 1; /* We want to put the initrd far enough into RAM that when the * kernel is uncompressed it will not clobber the initrd. However * on boards without much RAM we must ensure that we still leave * enough room for a decent sized initrd, and on boards with large * amounts of RAM we must avoid the initrd being so far up in RAM * that it is outside lowmem and inaccessible to the kernel. * So for boards with less than 256MB of RAM we put the initrd * halfway into RAM, and for boards with 256MB of RAM or more we put * the initrd at 128MB. */ info->initrd_start = info->loader_start + MIN(info->ram_size / 2, 128 * 1024 * 1024); /* Assume that raw images are linux kernels, and ELF images are not. */ kernel_size = arm_load_elf(info, &elf_entry, &elf_low_addr, &elf_high_addr, elf_machine); if (kernel_size > 0 && have_dtb(info)) { /* If there is still some room left at the base of RAM, try and put * the DTB there like we do for images loaded with -bios or -pflash. */ if (elf_low_addr > info->loader_start || elf_high_addr < info->loader_start) { /* Pass elf_low_addr as address limit to load_dtb if it may be * pointing into RAM, otherwise pass '0' (no limit) */ if (elf_low_addr < info->loader_start) { elf_low_addr = 0; } if (load_dtb(info->loader_start, info, elf_low_addr) < 0) { exit(1); } } } entry = elf_entry; if (kernel_size < 0) { kernel_size = load_uimage(info->kernel_filename, &entry, NULL, &is_linux, NULL, NULL); } if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64) && kernel_size < 0) { kernel_size = load_aarch64_image(info->kernel_filename, info->loader_start, &entry); is_linux = 1; } else if (kernel_size < 0) { /* 32-bit ARM */ entry = info->loader_start + KERNEL_LOAD_ADDR; kernel_size = load_image_targphys(info->kernel_filename, entry, info->ram_size - KERNEL_LOAD_ADDR); is_linux = 1; } if (kernel_size < 0) { error_report("could not load kernel '%s'", info->kernel_filename); exit(1); } info->entry = entry; if (is_linux) { uint32_t fixupcontext[FIXUP_MAX]; if (info->initrd_filename) { initrd_size = load_ramdisk(info->initrd_filename, info->initrd_start, info->ram_size - info->initrd_start); if (initrd_size < 0) { initrd_size = load_image_targphys(info->initrd_filename, info->initrd_start, info->ram_size - info->initrd_start); } if (initrd_size < 0) { error_report("could not load initrd '%s'", info->initrd_filename); exit(1); } } else { initrd_size = 0; } info->initrd_size = initrd_size; fixupcontext[FIXUP_BOARDID] = info->board_id; fixupcontext[FIXUP_BOARD_SETUP] = info->board_setup_addr; /* for device tree boot, we pass the DTB directly in r2. Otherwise * we point to the kernel args. */ if (have_dtb(info)) { hwaddr align; hwaddr dtb_start; if (elf_machine == EM_AARCH64) { /* * Some AArch64 kernels on early bootup map the fdt region as * * [ ALIGN_DOWN(fdt, 2MB) ... ALIGN_DOWN(fdt, 2MB) + 2MB ] * * Let's play safe and prealign it to 2MB to give us some space. */ align = 2 * 1024 * 1024; } else { /* * Some 32bit kernels will trash anything in the 4K page the * initrd ends in, so make sure the DTB isn't caught up in that. */ align = 4096; } /* Place the DTB after the initrd in memory with alignment. */ dtb_start = QEMU_ALIGN_UP(info->initrd_start + initrd_size, align); if (load_dtb(dtb_start, info, 0) < 0) { exit(1); } fixupcontext[FIXUP_ARGPTR] = dtb_start; } else { fixupcontext[FIXUP_ARGPTR] = info->loader_start + KERNEL_ARGS_ADDR; if (info->ram_size >= (1ULL << 32)) { error_report("RAM size must be less than 4GB to boot" " Linux kernel using ATAGS (try passing a device tree" " using -dtb)"); exit(1); } } fixupcontext[FIXUP_ENTRYPOINT] = entry; write_bootloader("bootloader", info->loader_start, primary_loader, fixupcontext); if (info->nb_cpus > 1) { info->write_secondary_boot(cpu, info); } if (info->write_board_setup) { info->write_board_setup(cpu, info); } /* Notify devices which need to fake up firmware initialization * that we're doing a direct kernel boot. */ object_child_foreach_recursive(object_get_root(), do_arm_linux_init, info); } info->is_linux = is_linux; for (cs = CPU(cpu); cs; cs = CPU_NEXT(cs)) { ARM_CPU(cs)->env.boot_info = info; } } void arm_load_kernel(ARMCPU *cpu, struct arm_boot_info *info) { CPUState *cs; info->load_kernel_notifier.cpu = cpu; info->load_kernel_notifier.notifier.notify = arm_load_kernel_notify; qemu_add_machine_init_done_notifier(&info->load_kernel_notifier.notifier); /* CPU objects (unlike devices) are not automatically reset on system * reset, so we must always register a handler to do so. If we're * actually loading a kernel, the handler is also responsible for * arranging that we start it correctly. */ for (cs = CPU(cpu); cs; cs = CPU_NEXT(cs)) { qemu_register_reset(do_cpu_reset, ARM_CPU(cs)); } } static const TypeInfo arm_linux_boot_if_info = { .name = TYPE_ARM_LINUX_BOOT_IF, .parent = TYPE_INTERFACE, .class_size = sizeof(ARMLinuxBootIfClass), }; static void arm_linux_boot_register_types(void) { type_register_static(&arm_linux_boot_if_info); } type_init(arm_linux_boot_register_types)