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* Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
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* - Added prep subcommand support
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* - Reorganized source - modeled after powerpc version
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* Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Marius Groeger <mgroeger@sysgo.de>
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* Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl)
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* SPDX-License-Identifier: GPL-2.0+
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#include <u-boot/zlib.h>
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#include <asm/byteorder.h>
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#include <fdt_support.h>
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#include <asm/bootm.h>
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#include <linux/compiler.h>
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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
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#include <asm/armv7.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct tag *params;
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static ulong get_sp(void)
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asm("mov %0, sp" : "=r"(ret) : );
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void arch_lmb_reserve(struct lmb *lmb)
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* Booting a (Linux) kernel image
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* Allocate space for command line and board info - the
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* address should be as high as possible within the reach of
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* the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused
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* memory, which means far enough below the current stack
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debug("## Current stack ends at 0x%08lx ", sp);
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/* adjust sp by 4K to be safe */
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gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
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* announce_and_cleanup() - Print message and prepare for kernel boot
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* @fake: non-zero to do everything except actually boot
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static void announce_and_cleanup(int fake)
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printf("\nStarting kernel ...%s\n\n", fake ?
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"(fake run for tracing)" : "");
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bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
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#ifdef CONFIG_BOOTSTAGE_FDT
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bootstage_fdt_add_report();
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#ifdef CONFIG_BOOTSTAGE_REPORT
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#ifdef CONFIG_USB_DEVICE
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cleanup_before_linux();
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static void setup_start_tag (bd_t *bd)
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params = (struct tag *)bd->bi_boot_params;
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params->hdr.tag = ATAG_CORE;
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params->hdr.size = tag_size (tag_core);
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params->u.core.flags = 0;
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params->u.core.pagesize = 0;
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params->u.core.rootdev = 0;
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params = tag_next (params);
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static void setup_memory_tags(bd_t *bd)
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for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) {
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params->hdr.tag = ATAG_MEM;
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params->hdr.size = tag_size (tag_mem32);
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params->u.mem.start = bd->bi_dram[i].start;
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params->u.mem.size = bd->bi_dram[i].size;
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params = tag_next (params);
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static void setup_commandline_tag(bd_t *bd, char *commandline)
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/* eat leading white space */
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for (p = commandline; *p == ' '; p++);
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/* skip non-existent command lines so the kernel will still
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* use its default command line.
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params->hdr.tag = ATAG_CMDLINE;
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(sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2;
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strcpy (params->u.cmdline.cmdline, p);
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params = tag_next (params);
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static void setup_initrd_tag(bd_t *bd, ulong initrd_start, ulong initrd_end)
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/* an ATAG_INITRD node tells the kernel where the compressed
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* ramdisk can be found. ATAG_RDIMG is a better name, actually.
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params->hdr.tag = ATAG_INITRD2;
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params->hdr.size = tag_size (tag_initrd);
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params->u.initrd.start = initrd_start;
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params->u.initrd.size = initrd_end - initrd_start;
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params = tag_next (params);
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static void setup_serial_tag(struct tag **tmp)
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struct tag *params = *tmp;
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struct tag_serialnr serialnr;
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get_board_serial(&serialnr);
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params->hdr.tag = ATAG_SERIAL;
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params->hdr.size = tag_size (tag_serialnr);
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params->u.serialnr.low = serialnr.low;
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params->u.serialnr.high= serialnr.high;
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params = tag_next (params);
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static void setup_revision_tag(struct tag **in_params)
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rev = get_board_rev();
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params->hdr.tag = ATAG_REVISION;
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params->hdr.size = tag_size (tag_revision);
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params->u.revision.rev = rev;
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params = tag_next (params);
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static void setup_end_tag(bd_t *bd)
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params->hdr.tag = ATAG_NONE;
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params->hdr.size = 0;
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__weak void setup_board_tags(struct tag **in_params) {}
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static void do_nonsec_virt_switch(void)
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#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
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if (armv7_switch_nonsec() == 0)
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#ifdef CONFIG_ARMV7_VIRT
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if (armv7_switch_hyp() == 0)
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debug("entered HYP mode\n");
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debug("entered non-secure state\n");
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flush_dcache_all(); /* flush cache before swtiching to EL2 */
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armv8_switch_to_el2();
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#ifdef CONFIG_ARMV8_SWITCH_TO_EL1
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armv8_switch_to_el1();
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/* Subcommand: PREP */
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static void boot_prep_linux(bootm_headers_t *images)
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char *commandline = getenv("bootargs");
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
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#ifdef CONFIG_OF_LIBFDT
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debug("using: FDT\n");
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if (image_setup_linux(images)) {
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printf("FDT creation failed! hanging...");
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} else if (BOOTM_ENABLE_TAGS) {
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debug("using: ATAGS\n");
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setup_start_tag(gd->bd);
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if (BOOTM_ENABLE_SERIAL_TAG)
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setup_serial_tag(¶ms);
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if (BOOTM_ENABLE_CMDLINE_TAG)
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setup_commandline_tag(gd->bd, commandline);
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if (BOOTM_ENABLE_REVISION_TAG)
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setup_revision_tag(¶ms);
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if (BOOTM_ENABLE_MEMORY_TAGS)
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setup_memory_tags(gd->bd);
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if (BOOTM_ENABLE_INITRD_TAG) {
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if (images->rd_start && images->rd_end) {
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setup_initrd_tag(gd->bd, images->rd_start,
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setup_board_tags(¶ms);
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setup_end_tag(gd->bd);
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printf("FDT and ATAGS support not compiled in - hanging\n");
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do_nonsec_virt_switch();
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static void boot_jump_linux(bootm_headers_t *images, int flag)
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void (*kernel_entry)(void *fdt_addr);
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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kernel_entry = (void (*)(void *fdt_addr))images->ep;
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debug("## Transferring control to Linux (at address %lx)...\n",
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(ulong) kernel_entry);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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announce_and_cleanup(fake);
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kernel_entry(images->ft_addr);
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unsigned long machid = gd->bd->bi_arch_number;
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void (*kernel_entry)(int zero, int arch, uint params);
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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kernel_entry = (void (*)(int, int, uint))images->ep;
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s = getenv("machid");
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strict_strtoul(s, 16, &machid);
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printf("Using machid 0x%lx from environment\n", machid);
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debug("## Transferring control to Linux (at address %08lx)" \
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"...\n", (ulong) kernel_entry);
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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announce_and_cleanup(fake);
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
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r2 = (unsigned long)images->ft_addr;
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r2 = gd->bd->bi_boot_params;
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kernel_entry(0, machid, r2);
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/* Main Entry point for arm bootm implementation
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* Modeled after the powerpc implementation
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* DIFFERENCE: Instead of calling prep and go at the end
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* they are called if subcommand is equal 0.
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int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
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/* No need for those on ARM */
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if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
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if (flag & BOOTM_STATE_OS_PREP) {
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boot_prep_linux(images);
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if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
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boot_jump_linux(images, flag);
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boot_prep_linux(images);
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boot_jump_linux(images, flag);
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#ifdef CONFIG_CMD_BOOTZ
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struct zimage_header {
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#define LINUX_ARM_ZIMAGE_MAGIC 0x016f2818
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int bootz_setup(ulong image, ulong *start, ulong *end)
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struct zimage_header *zi;
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zi = (struct zimage_header *)map_sysmem(image, 0);
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if (zi->zi_magic != LINUX_ARM_ZIMAGE_MAGIC) {
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puts("Bad Linux ARM zImage magic!\n");
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*start = zi->zi_start;
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printf("Kernel image @ %#08lx [ %#08lx - %#08lx ]\n", image, *start,
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#endif /* CONFIG_CMD_BOOTZ */
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#if defined(CONFIG_BOOTM_VXWORKS)
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void boot_prep_vxworks(bootm_headers_t *images)
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#if defined(CONFIG_OF_LIBFDT)
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if (images->ft_addr) {
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off = fdt_path_offset(images->ft_addr, "/memory");
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if (arch_fixup_memory_node(images->ft_addr))
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puts("## WARNING: fixup memory failed!\n");
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cleanup_before_linux();
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void boot_jump_vxworks(bootm_headers_t *images)
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/* ARM VxWorks requires device tree physical address to be passed */
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((void (*)(void *))images->ep)(images->ft_addr);