bootm原理 ========= 基础知识 --------- - vmlinux vmlinux是可引导的，可压缩的内核镜像，vm代表virtual memory。vmlinux是elf格式的文件，是最原始的内核文件 - Image Image是经过objcopy处理的只包含二进制数据的内核代码，它已经不是elf格式了，但是还没有经过压缩 - zImage Image经过gzip压缩得到zImage - uImage zImage加上一个64字节的头信息，在头中说明镜像文件的类型，加载位置，生成时间，大小等信息，变生成了uImage - xipImage 这种格式的镜像文件多放在nor flash上，且运行时不需要拷贝到内存中，可以直接在nor flash上运行 bootm实现 ---------- bootm命令的定义 :: U_BOOT_CMD( bootm, CONFIG_SYS_MAXARGS, 1, do_bootm, "boot application image from memory", bootm_help_text ); **bootm主函数** :: /*******************************************************************/ /* bootm - boot application image from image in memory */ /*******************************************************************/ int do_bootm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { #ifdef CONFIG_NEEDS_MANUAL_RELOC //没定义 static int relocated = 0; if (!relocated) { int i; /* relocate names of sub-command table */ for (i = 0; i < ARRAY_SIZE(cmd_bootm_sub); i++) cmd_bootm_sub[i].name += gd->reloc_off; relocated = 1; } #endif /* determine if we have a sub command */ argc--; argv++; if (argc > 0) { //假设我们传了一个参数"0x10000000" char *endp; simple_strtoul(argv[0], &endp, 16); /* endp pointing to NULL means that argv[0] was just a * valid number, pass it along to the normal bootm processing * * If endp is ':' or '#' assume a FIT identifier so pass * along for normal processing. * * Right now we assume the first arg should never be '-' */ if ((*endp != 0) && (*endp != ':') && (*endp != '#')) return do_bootm_subcommand(cmdtp, flag, argc, argv); } return do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START | BOOTM_STATE_FINDOS | BOOTM_STATE_FINDOTHER | BOOTM_STATE_LOADOS | #ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH BOOTM_STATE_RAMDISK | #endif #if defined(CONFIG_PPC) || defined(CONFIG_MIPS) BOOTM_STATE_OS_CMDLINE | #endif BOOTM_STATE_OS_PREP | BOOTM_STATE_OS_FAKE_GO | BOOTM_STATE_OS_GO, &images, 1); //images是一个比较重要的全局变量 } 下面列出bootm_headers的内容，等会一个一个填充 - do_bootm_states函数 :: /** * Execute selected states of the bootm command. * * Note the arguments to this state must be the first argument, Any 'bootm' * or sub-command arguments must have already been taken. * * Note that if states contains more than one flag it MUST contain * BOOTM_STATE_START, since this handles and consumes the command line args. * * Also note that aside from boot_os_fn functions and bootm_load_os no other * functions we store the return value of in 'ret' may use a negative return * value, without special handling. * * @param cmdtp Pointer to bootm command table entry * @param flag Command flags (CMD_FLAG_...) * @param argc Number of subcommand arguments (0 = no arguments) * @param argv Arguments * @param states Mask containing states to run (BOOTM_STATE_...) * @param images Image header information * @param boot_progress 1 to show boot progress, 0 to not do this * @return 0 if ok, something else on error. Some errors will cause this * function to perform a reboot! If states contains BOOTM_STATE_OS_GO * then the intent is to boot an OS, so this function will not return * unless the image type is standalone. */ int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[], int states, bootm_headers_t *images, int boot_progress) { boot_os_fn *boot_fn; ulong iflag = 0; int ret = 0, need_boot_fn; images->state |= states; //将传入的state赋值给image /* * Work through the states and see how far we get. We stop on * any error. */ if (states & BOOTM_STATE_START) ret = bootm_start(cmdtp, flag, argc, argv); if (!ret && (states & BOOTM_STATE_FINDOS)) ret = bootm_find_os(cmdtp, flag, argc, argv); if (!ret && (states & BOOTM_STATE_FINDOTHER)) ret = bootm_find_other(cmdtp, flag, argc, argv); /* Load the OS */ if (!ret && (states & BOOTM_STATE_LOADOS)) { iflag = bootm_disable_interrupts(); //关中断 ret = bootm_load_os(images, 0); //加载os if (ret && ret != BOOTM_ERR_OVERLAP) goto err; else if (ret == BOOTM_ERR_OVERLAP) ret = 0; } /* Relocate the ramdisk */ #ifdef CONFIG_SYS_BOOT_RAMDISK_HIGH //没定义 if (!ret && (states & BOOTM_STATE_RAMDISK)) { ulong rd_len = images->rd_end - images->rd_start; ret = boot_ramdisk_high(&images->lmb, images->rd_start, rd_len, &images->initrd_start, &images->initrd_end); if (!ret) { env_set_hex("initrd_start", images->initrd_start); env_set_hex("initrd_end", images->initrd_end); } } #endif #if IMAGE_ENABLE_OF_LIBFDT && defined(CONFIG_LMB) if (!ret && (states & BOOTM_STATE_FDT)) { boot_fdt_add_mem_rsv_regions(&images->lmb, images->ft_addr); ret = boot_relocate_fdt(&images->lmb, &images->ft_addr, &images->ft_len); } #endif /* From now on, we need the OS boot function */ if (ret) return ret; boot_fn = bootm_os_get_boot_func(images->os.os); //得到我们要运行的os函数 need_boot_fn = states & (BOOTM_STATE_OS_CMDLINE | BOOTM_STATE_OS_BD_T | BOOTM_STATE_OS_PREP | BOOTM_STATE_OS_FAKE_GO | BOOTM_STATE_OS_GO); if (boot_fn == NULL && need_boot_fn) { if (iflag) enable_interrupts(); printf("ERROR: booting os '%s' (%d) is not supported\n", genimg_get_os_name(images->os.os), images->os.os); bootstage_error(BOOTSTAGE_ID_CHECK_BOOT_OS); return 1; } /* Call various other states that are not generally used */ if (!ret && (states & BOOTM_STATE_OS_CMDLINE)) ret = boot_fn(BOOTM_STATE_OS_CMDLINE, argc, argv, images); if (!ret && (states & BOOTM_STATE_OS_BD_T)) ret = boot_fn(BOOTM_STATE_OS_BD_T, argc, argv, images); if (!ret && (states & BOOTM_STATE_OS_PREP)) { #if defined(CONFIG_SILENT_CONSOLE) && !defined(CONFIG_SILENT_U_BOOT_ONLY) if (images->os.os == IH_OS_LINUX) fixup_silent_linux(); #endif ret = boot_fn(BOOTM_STATE_OS_PREP, argc, argv, images); //根据state状态的传入,这里会执行 } #ifdef CONFIG_TRACE //没定义 /* Pretend to run the OS, then run a user command */ if (!ret && (states & BOOTM_STATE_OS_FAKE_GO)) { char *cmd_list = env_get("fakegocmd"); ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_FAKE_GO, images, boot_fn); if (!ret && cmd_list) ret = run_command_list(cmd_list, -1, flag); } #endif /* Check for unsupported subcommand. */ if (ret) { puts("subcommand not supported\n"); return ret; } /* Now run the OS! We hope this doesn't return */ if (!ret && (states & BOOTM_STATE_OS_GO)) ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_GO, images, boot_fn); /* Deal with any fallout */ err: if (iflag) enable_interrupts(); if (ret == BOOTM_ERR_UNIMPLEMENTED) bootstage_error(BOOTSTAGE_ID_DECOMP_UNIMPL); else if (ret == BOOTM_ERR_RESET) do_reset(cmdtp, flag, argc, argv); return ret; } **bootm_start** - boot_start函数 :: static int bootm_start(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { memset((void *)&images, 0, sizeof(images)); //将全局变量images清0，包括设置的states images.verify = env_get_yesno("verify"); //得到环境变量verify，定义为n表示不对zImage进行crc校验，y则校验 boot_start_lmb(&images); //没定义CONFIG_LMB,空函数 bootstage_mark_name(BOOTSTAGE_ID_BOOTM_START, "bootm_start"); images.state = BOOTM_STATE_START; //标记状态 return 0; } **bootm_find_os** - boot_find_os :: static int bootm_find_os(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) { const void *os_hdr; bool ep_found = false; int ret; /* get kernel image header, start address and length */ os_hdr = boot_get_kernel(cmdtp, flag, argc, argv, &images, &images.os.image_start, &images.os.image_len); if (images.os.image_len == 0) { puts("ERROR: can't get kernel image!\n"); return 1; } /* get image parameters */ switch (genimg_get_format(os_hdr)) { #if defined(CONFIG_IMAGE_FORMAT_LEGACY) case IMAGE_FORMAT_LEGACY: images.os.type = image_get_type(os_hdr); //填充各种os信息 images.os.comp = image_get_comp(os_hdr); images.os.os = image_get_os(os_hdr); images.os.end = image_get_image_end(os_hdr); images.os.load = image_get_load(os_hdr); images.os.arch = image_get_arch(os_hdr); break; #endif #if IMAGE_ENABLE_FIT case IMAGE_FORMAT_FIT: if (fit_image_get_type(images.fit_hdr_os, images.fit_noffset_os, &images.os.type)) { puts("Can't get image type!\n"); bootstage_error(BOOTSTAGE_ID_FIT_TYPE); return 1; } if (fit_image_get_comp(images.fit_hdr_os, images.fit_noffset_os, &images.os.comp)) { puts("Can't get image compression!\n"); bootstage_error(BOOTSTAGE_ID_FIT_COMPRESSION); return 1; } if (fit_image_get_os(images.fit_hdr_os, images.fit_noffset_os, &images.os.os)) { puts("Can't get image OS!\n"); bootstage_error(BOOTSTAGE_ID_FIT_OS); return 1; } if (fit_image_get_arch(images.fit_hdr_os, images.fit_noffset_os, &images.os.arch)) { puts("Can't get image ARCH!\n"); return 1; } images.os.end = fit_get_end(images.fit_hdr_os); if (fit_image_get_load(images.fit_hdr_os, images.fit_noffset_os, &images.os.load)) { puts("Can't get image load address!\n"); bootstage_error(BOOTSTAGE_ID_FIT_LOADADDR); return 1; } break; #endif #ifdef CONFIG_ANDROID_BOOT_IMAGE case IMAGE_FORMAT_ANDROID: images.os.type = IH_TYPE_KERNEL; images.os.comp = IH_COMP_GZIP; images.os.os = IH_OS_LINUX; images.os.end = android_image_get_end(os_hdr); images.os.load = android_image_get_kload(os_hdr); images.ep = images.os.load; ep_found = true; break; #endif default: puts("ERROR: unknown image format type!\n"); return 1; } /* If we have a valid setup.bin, we will use that for entry (x86) */ if (images.os.arch == IH_ARCH_I386 || images.os.arch == IH_ARCH_X86_64) { ulong len; ret = boot_get_setup(&images, IH_ARCH_I386, &images.ep, &len); if (ret < 0 && ret != -ENOENT) { puts("Could not find a valid setup.bin for x86\n"); return 1; } /* Kernel entry point is the setup.bin */ } else if (images.legacy_hdr_valid) { images.ep = image_get_ep(&images.legacy_hdr_os_copy); //对ep进行赋值 #if IMAGE_ENABLE_FIT } else if (images.fit_uname_os) { int ret; ret = fit_image_get_entry(images.fit_hdr_os, images.fit_noffset_os, &images.ep); if (ret) { puts("Can't get entry point property!\n"); return 1; } #endif } else if (!ep_found) { puts("Could not find kernel entry point!\n"); return 1; } if (images.os.type == IH_TYPE_KERNEL_NOLOAD) { if (CONFIG_IS_ENABLED(CMD_BOOTI) && images.os.arch == IH_ARCH_ARM64) { ulong image_addr; ulong image_size; ret = booti_setup(images.os.image_start, &image_addr, &image_size, true); if (ret != 0) return 1; images.os.type = IH_TYPE_KERNEL; images.os.load = image_addr; images.ep = image_addr; } else { images.os.load = images.os.image_start; images.ep += images.os.image_start; } } images.os.start = map_to_sysmem(os_hdr); //设置os.start return 0; } - image_get_kern image_get_kern 在boot_get_kern中调用 :: /** * image_get_kernel - verify legacy format kernel image * @img_addr: in RAM address of the legacy format image to be verified * @verify: data CRC verification flag * * image_get_kernel() verifies legacy image integrity and returns pointer to * legacy image header if image verification was completed successfully. * * returns: * pointer to a legacy image header if valid image was found * otherwise return NULL */ static image_header_t *image_get_kernel(ulong img_addr, int verify) { image_header_t *hdr = (image_header_t *)img_addr; if (!image_check_magic(hdr)) { //魔数校验 puts("Bad Magic Number\n"); bootstage_error(BOOTSTAGE_ID_CHECK_MAGIC); return NULL; } bootstage_mark(BOOTSTAGE_ID_CHECK_HEADER); if (!image_check_hcrc(hdr)) { //前64字节的crc校验 puts("Bad Header Checksum\n"); bootstage_error(BOOTSTAGE_ID_CHECK_HEADER); return NULL; } bootstage_mark(BOOTSTAGE_ID_CHECK_CHECKSUM); image_print_contents(hdr); //打印头信息 if (verify) { //环境变量中会设置verify来决定是否需要校验 puts(" Verifying Checksum ... "); if (!image_check_dcrc(hdr)) { printf("Bad Data CRC\n"); bootstage_error(BOOTSTAGE_ID_CHECK_CHECKSUM); return NULL; } puts("OK\n"); } bootstage_mark(BOOTSTAGE_ID_CHECK_ARCH); if (!image_check_target_arch(hdr)) { //体系结构校验 printf("Unsupported Architecture 0x%x\n", image_get_arch(hdr)); bootstage_error(BOOTSTAGE_ID_CHECK_ARCH); return NULL; } return hdr; } - image_print_contents image_print_contents打印uimage头信息 :: void image_print_contents(const void *ptr) { const image_header_t *hdr = (const image_header_t *)ptr; const char __maybe_unused *p; p = IMAGE_INDENT_STRING; printf("%sImage Name: %.*s\n", p, IH_NMLEN, image_get_name(hdr)); if (IMAGE_ENABLE_TIMESTAMP) { printf("%sCreated: ", p); genimg_print_time((time_t)image_get_time(hdr)); } printf("%sImage Type: ", p); //打印image类型提示符 image_print_type(hdr); //实际打印image类型 printf("%sData Size: ", p); genimg_print_size(image_get_data_size(hdr)); printf("%sLoad Address: %08x\n", p, image_get_load(hdr)); printf("%sEntry Point: %08x\n", p, image_get_ep(hdr)); if (image_check_type(hdr, IH_TYPE_MULTI) || image_check_type(hdr, IH_TYPE_SCRIPT)) { int i; ulong data, len; ulong count = image_multi_count(hdr); printf("%sContents:\n", p); for (i = 0; i < count; i++) { image_multi_getimg(hdr, i, &data, &len); printf("%s Image %d: ", p, i); genimg_print_size(len); if (image_check_type(hdr, IH_TYPE_SCRIPT) && i > 0) { /* * the user may need to know offsets * if planning to do something with * multiple files */ printf("%s Offset = 0x%08lx\n", p, data); } } } else if (image_check_type(hdr, IH_TYPE_FIRMWARE_IVT)) { printf("HAB Blocks: 0x%08x 0x0000 0x%08x\n", image_get_load(hdr) - image_get_header_size(), image_get_size(hdr) + image_get_header_size() - 0x1FE0); } } **bootm_load_os** - bootm_load_os :: static int bootm_load_os(bootm_headers_t *images, int boot_progress) { image_info_t os = images->os; ulong load = os.load; ulong load_end; ulong blob_start = os.start; ulong blob_end = os.end; ulong image_start = os.image_start; ulong image_len = os.image_len; ulong flush_start = ALIGN_DOWN(load, ARCH_DMA_MINALIGN); ulong flush_len; bool no_overlap; void *load_buf, *image_buf; int err; load_buf = map_sysmem(load, 0); image_buf = map_sysmem(os.image_start, image_len); err = bootm_decomp_image(os.comp, load, os.image_start, os.type, load_buf, image_buf, image_len, CONFIG_SYS_BOOTM_LEN, &load_end); //解压缩zImage if (err) { bootstage_error(BOOTSTAGE_ID_DECOMP_IMAGE); return err; } flush_len = load_end - load; if (flush_start < load) flush_len += load - flush_start; flush_cache(flush_start, ALIGN(flush_len, ARCH_DMA_MINALIGN)); #if !(UBOOT_LOG_OPTIMIZE) printf(" kernel loaded to 0x%08lx, end = 0x%08lx\n", load, load_end); #endif bootstage_mark(BOOTSTAGE_ID_KERNEL_LOADED); no_overlap = (os.comp == IH_COMP_NONE && load == image_start); if (!no_overlap && load < blob_end && load_end > blob_start) { debug("images.os.start = 0x%lX, images.os.end = 0x%lx\n", blob_start, blob_end); debug("images.os.load = 0x%lx, load_end = 0x%lx\n", load, load_end); /* Check what type of image this is. */ if (images->legacy_hdr_valid) { if (image_get_type(&images->legacy_hdr_os_copy) == IH_TYPE_MULTI) puts("WARNING: legacy format multi component image overwritten\n"); return BOOTM_ERR_OVERLAP; } else { puts("ERROR: new format image overwritten - must RESET the board to recover\n"); bootstage_error(BOOTSTAGE_ID_OVERWRITTEN); return BOOTM_ERR_RESET; } } lmb_reserve(&images->lmb, images->os.load, (load_end - images->os.load)); return 0; } **bootm_os_get_boot_func** - bootm_os_get_boot_func :: boot_os_fn *bootm_os_get_boot_func(int os) { #ifdef CONFIG_NEEDS_MANUAL_RELOC //没定义不执行 static bool relocated; if (!relocated) { int i; /* relocate boot function table */ for (i = 0; i < ARRAY_SIZE(boot_os); i++) if (boot_os[i] != NULL) boot_os[i] += gd->reloc_off; relocated = true; } #endif return boot_os[os]; //根据os类型返回对应的函数指针 } static boot_os_fn *boot_os[] = { [IH_OS_U_BOOT] = do_bootm_standalone, #ifdef CONFIG_BOOTM_LINUX [IH_OS_LINUX] = do_bootm_linux, #endif #ifdef CONFIG_BOOTM_NETBSD [IH_OS_NETBSD] = do_bootm_netbsd, #endif #ifdef CONFIG_LYNXKDI [IH_OS_LYNXOS] = do_bootm_lynxkdi, #endif #ifdef CONFIG_BOOTM_RTEMS [IH_OS_RTEMS] = do_bootm_rtems, #endif #if defined(CONFIG_BOOTM_OSE) [IH_OS_OSE] = do_bootm_ose, #endif #if defined(CONFIG_BOOTM_PLAN9) [IH_OS_PLAN9] = do_bootm_plan9, #endif #if defined(CONFIG_BOOTM_VXWORKS) && \ (defined(CONFIG_PPC) || defined(CONFIG_ARM)) [IH_OS_VXWORKS] = do_bootm_vxworks, #endif #if defined(CONFIG_CMD_ELF) [IH_OS_QNX] = do_bootm_qnxelf, #endif #ifdef CONFIG_INTEGRITY [IH_OS_INTEGRITY] = do_bootm_integrity, #endif #ifdef CONFIG_BOOTM_OPENRTOS [IH_OS_OPENRTOS] = do_bootm_openrtos, #endif #ifdef CONFIG_BOOTM_OPTEE [IH_OS_TEE] = do_bootm_tee, #endif }; **boot_selected_os** - boot_selected_os :: int boot_selected_os(int argc, char * const argv[], int state, bootm_headers_t *images, boot_os_fn *boot_fn) { arch_preboot_os(); boot_fn(state, argc, argv, images); //执行do_bootm_linux函数 /* Stand-alone may return when 'autostart' is 'no' */ if (images->os.type == IH_TYPE_STANDALONE || IS_ENABLED(CONFIG_SANDBOX) || state == BOOTM_STATE_OS_FAKE_GO) /* We expect to return */ return 0; bootstage_error(BOOTSTAGE_ID_BOOT_OS_RETURNED); debug("\n## Control returned to monitor - resetting...\n"); return BOOTM_ERR_RESET; } - do_bootm_linux :: int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images) { //前面传参flag=BOOTM_STATE_OS_PREP /* No need for those on ARC */ if ((flag & BOOTM_STATE_OS_BD_T) || (flag & BOOTM_STATE_OS_CMDLINE)) return -1; if (flag & BOOTM_STATE_OS_PREP) return boot_prep_linux(images); if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { boot_jump_linux(images, flag); return 0; } return -1; } - boot_prep_linux :: static void boot_prep_linux(bootm_headers_t *images) { char *commandline = env_get("bootargs"); //获取bootargs环境变量 if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { #ifdef CONFIG_OF_LIBFDT debug("using: FDT\n"); if (image_setup_linux(images)) { //设置fdt printf("FDT creation failed! hanging..."); hang(); } #endif } else if (BOOTM_ENABLE_TAGS) { debug("using: ATAGS\n"); setup_start_tag(gd->bd); //设置起始头 if (BOOTM_ENABLE_SERIAL_TAG) setup_serial_tag(¶ms); //设置串口信息 if (BOOTM_ENABLE_CMDLINE_TAG) setup_commandline_tag(gd->bd, commandline); //设置命令行参数,重要 if (BOOTM_ENABLE_REVISION_TAG) setup_revision_tag(¶ms); //设置版本，不重要 if (BOOTM_ENABLE_MEMORY_TAGS) setup_memory_tags(gd->bd); //设置内存信息，重要 if (BOOTM_ENABLE_INITRD_TAG) { /* * In boot_ramdisk_high(), it may relocate ramdisk to * a specified location. And set images->initrd_start & * images->initrd_end to relocated ramdisk's start/end * addresses. So use them instead of images->rd_start & * images->rd_end when possible. */ if (images->initrd_start && images->initrd_end) { setup_initrd_tag(gd->bd, images->initrd_start, images->initrd_end); } else if (images->rd_start && images->rd_end) { setup_initrd_tag(gd->bd, images->rd_start, images->rd_end); } } setup_board_tags(¶ms); setup_end_tag(gd->bd); } else { printf("FDT and ATAGS support not compiled in - hanging\n"); hang(); } } int image_setup_linux(bootm_headers_t *images) { ulong of_size = images->ft_len; char **of_flat_tree = &images->ft_addr; struct lmb *lmb = &images->lmb; int ret; if (IMAGE_ENABLE_OF_LIBFDT) boot_fdt_add_mem_rsv_regions(lmb, *of_flat_tree); if (IMAGE_BOOT_GET_CMDLINE) { ret = boot_get_cmdline(lmb, &images->cmdline_start, &images->cmdline_end); if (ret) { puts("ERROR with allocation of cmdline\n"); return ret; } } if (IMAGE_ENABLE_OF_LIBFDT) { ret = boot_relocate_fdt(lmb, of_flat_tree, &of_size); if (ret) return ret; } if (IMAGE_ENABLE_OF_LIBFDT && of_size) { ret = image_setup_libfdt(images, *of_flat_tree, of_size, lmb); if (ret) return ret; } return 0; } - boot_jump_linux :: static void boot_jump_linux(bootm_headers_t *images, int flag) { #ifdef CONFIG_ARM64 void (*kernel_entry)(void *fdt_addr, void *res0, void *res1, void *res2); int fake = (flag & BOOTM_STATE_OS_FAKE_GO); kernel_entry = (void (*)(void *fdt_addr, void *res0, void *res1, void *res2))images->ep; debug("## Transferring control to Linux (at address %lx)...\n", (ulong) kernel_entry); bootstage_mark(BOOTSTAGE_ID_RUN_OS); announce_and_cleanup(fake); #ifdef X2_AUTOBOOT boot_stage_mark(3); #endif if (!fake) { #ifdef CONFIG_ARMV8_PSCI armv8_setup_psci(); #endif do_nonsec_virt_switch(); update_os_arch_secondary_cores(images->os.arch); #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, (u64)switch_to_el1, ES_TO_AARCH64); #else if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && (images->os.arch == IH_ARCH_ARM)) armv8_switch_to_el2(0, (u64)gd->bd->bi_arch_number, (u64)images->ft_addr, 0, (u64)images->ep, ES_TO_AARCH32); else armv8_switch_to_el2((u64)images->ft_addr, 0, 0, 0, images->ep, ES_TO_AARCH64); #endif } #else // else this armv7, not CONFIG_ARM64 unsigned long machid = gd->bd->bi_arch_number; char *s; void (*kernel_entry)(int zero, int arch, uint params); unsigned long r2; int fake = (flag & BOOTM_STATE_OS_FAKE_GO); kernel_entry = (void (*)(int, int, uint))images->ep; #ifdef CONFIG_CPU_V7M ulong addr = (ulong)kernel_entry | 1; kernel_entry = (void *)addr; #endif s = env_get("machid"); if (s) { if (strict_strtoul(s, 16, &machid) < 0) { debug("strict_strtoul failed!\n"); return; } printf("Using machid 0x%lx from environment\n", machid); } debug("## Transferring control to Linux (at address %08lx)" \ "...\n", (ulong) kernel_entry); bootstage_mark(BOOTSTAGE_ID_RUN_OS); announce_and_cleanup(fake); if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) r2 = (unsigned long)images->ft_addr; else r2 = gd->bd->bi_boot_params; if (!fake) { #ifdef CONFIG_ARMV7_NONSEC if (armv7_boot_nonsec()) { armv7_init_nonsec(); secure_ram_addr(_do_nonsec_entry)(kernel_entry, 0, machid, r2); } else #endif kernel_entry(0, machid, r2); } #endif } __weak void board_jump_and_run(ulong entry, int zero, int arch, uint params) { void (*kernel_entry)(int zero, int arch, uint params); kernel_entry = (void (*)(int, int, uint))entry; kernel_entry(zero, arch, params); }