// SPDX-License-Identifier: GPL-2.0+ /* Copyright (C) 2011 * Corscience GmbH & Co. KG - Simon Schwarz * - Added prep subcommand support * - Reorganized source - modeled after powerpc version * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH * Marius Groeger * * Copyright (C) 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ARMV7_NONSEC #include #endif #include DECLARE_GLOBAL_DATA_PTR; static struct tag *params; static ulong get_sp(void) { ulong ret; asm("mov %0, sp" : "=r"(ret) : ); return ret; } void arch_lmb_reserve(struct lmb *lmb) { ulong sp, bank_end; int bank; /* * Booting a (Linux) kernel image * * Allocate space for command line and board info - the * address should be as high as possible within the reach of * the kernel (see CONFIG_SYS_BOOTMAPSZ settings), but in unused * memory, which means far enough below the current stack * pointer. */ sp = get_sp(); debug("## Current stack ends at 0x%08lx ", sp); /* adjust sp by 4K to be safe */ sp -= 4096; for (bank = 0; bank < CONFIG_NR_DRAM_BANKS; bank++) { if (!gd->bd->bi_dram[bank].size || sp < gd->bd->bi_dram[bank].start) continue; /* Watch out for RAM at end of address space! */ bank_end = gd->bd->bi_dram[bank].start + gd->bd->bi_dram[bank].size - 1; if (sp > bank_end) continue; if (bank_end > gd->ram_top) bank_end = gd->ram_top - 1; lmb_reserve(lmb, sp, bank_end - sp + 1); break; } } __weak void board_quiesce_devices(void) { } /** * announce_and_cleanup() - Print message and prepare for kernel boot * * @fake: non-zero to do everything except actually boot */ static void announce_and_cleanup(int fake) { bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel"); #ifdef CONFIG_BOOTSTAGE_FDT bootstage_fdt_add_report(); #endif #ifdef CONFIG_BOOTSTAGE_REPORT bootstage_report(); #endif #ifdef CONFIG_USB_DEVICE udc_disconnect(); #endif board_quiesce_devices(); printf("\nStarting kernel ...%s\n\n", fake ? "(fake run for tracing)" : ""); /* * Call remove function of all devices with a removal flag set. * This may be useful for last-stage operations, like cancelling * of DMA operation or releasing device internal buffers. */ dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL); cleanup_before_linux(); } static void setup_start_tag (struct bd_info *bd) { params = (struct tag *)bd->bi_boot_params; params->hdr.tag = ATAG_CORE; params->hdr.size = tag_size (tag_core); params->u.core.flags = 0; params->u.core.pagesize = 0; params->u.core.rootdev = 0; params = tag_next (params); } static void setup_memory_tags(struct bd_info *bd) { int i; for (i = 0; i < CONFIG_NR_DRAM_BANKS; i++) { params->hdr.tag = ATAG_MEM; params->hdr.size = tag_size (tag_mem32); params->u.mem.start = bd->bi_dram[i].start; params->u.mem.size = bd->bi_dram[i].size; params = tag_next (params); } } static void setup_commandline_tag(struct bd_info *bd, char *commandline) { char *p; if (!commandline) return; /* eat leading white space */ for (p = commandline; *p == ' '; p++); /* skip non-existent command lines so the kernel will still * use its default command line. */ if (*p == '\0') return; params->hdr.tag = ATAG_CMDLINE; params->hdr.size = (sizeof (struct tag_header) + strlen (p) + 1 + 4) >> 2; strcpy (params->u.cmdline.cmdline, p); params = tag_next (params); } static void setup_initrd_tag(struct bd_info *bd, ulong initrd_start, ulong initrd_end) { /* an ATAG_INITRD node tells the kernel where the compressed * ramdisk can be found. ATAG_RDIMG is a better name, actually. */ params->hdr.tag = ATAG_INITRD2; params->hdr.size = tag_size (tag_initrd); params->u.initrd.start = initrd_start; params->u.initrd.size = initrd_end - initrd_start; params = tag_next (params); } static void setup_serial_tag(struct tag **tmp) { struct tag *params = *tmp; struct tag_serialnr serialnr; get_board_serial(&serialnr); params->hdr.tag = ATAG_SERIAL; params->hdr.size = tag_size (tag_serialnr); params->u.serialnr.low = serialnr.low; params->u.serialnr.high= serialnr.high; params = tag_next (params); *tmp = params; } static void setup_revision_tag(struct tag **in_params) { u32 rev = 0; rev = get_board_rev(); params->hdr.tag = ATAG_REVISION; params->hdr.size = tag_size (tag_revision); params->u.revision.rev = rev; params = tag_next (params); } static void setup_end_tag(struct bd_info *bd) { params->hdr.tag = ATAG_NONE; params->hdr.size = 0; } __weak void setup_board_tags(struct tag **in_params) {} #ifdef CONFIG_ARM64 static void do_nonsec_virt_switch(void) { smp_kick_all_cpus(); dcache_disable(); /* flush cache before swtiching to EL2 */ } #endif __weak void board_prep_linux(bootm_headers_t *images) { } /* Subcommand: PREP */ static void boot_prep_linux(bootm_headers_t *images) { char *commandline = env_get("bootargs"); if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) { #ifdef CONFIG_OF_LIBFDT debug("using: FDT\n"); if (image_setup_linux(images)) { printf("FDT creation failed! hanging..."); hang(); } #endif } else if (BOOTM_ENABLE_TAGS) { debug("using: ATAGS\n"); setup_start_tag(gd->bd); if (BOOTM_ENABLE_SERIAL_TAG) setup_serial_tag(¶ms); if (BOOTM_ENABLE_CMDLINE_TAG) setup_commandline_tag(gd->bd, commandline); if (BOOTM_ENABLE_REVISION_TAG) setup_revision_tag(¶ms); if (BOOTM_ENABLE_MEMORY_TAGS) setup_memory_tags(gd->bd); 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(); } board_prep_linux(images); } __weak bool armv7_boot_nonsec_default(void) { #ifdef CONFIG_ARMV7_BOOT_SEC_DEFAULT return false; #else return true; #endif } #ifdef CONFIG_ARMV7_NONSEC bool armv7_boot_nonsec(void) { char *s = env_get("bootm_boot_mode"); bool nonsec = armv7_boot_nonsec_default(); if (s && !strcmp(s, "sec")) nonsec = false; if (s && !strcmp(s, "nonsec")) nonsec = true; return nonsec; } #endif #ifdef CONFIG_ARM64 __weak void update_os_arch_secondary_cores(uint8_t os_arch) { } #ifdef CONFIG_ARMV8_SWITCH_TO_EL1 static void switch_to_el1(void) { if ((IH_ARCH_DEFAULT == IH_ARCH_ARM64) && (images.os.arch == IH_ARCH_ARM)) armv8_switch_to_el1(0, (u64)gd->bd->bi_arch_number, (u64)images.ft_addr, 0, (u64)images.ep, ES_TO_AARCH32); else armv8_switch_to_el1((u64)images.ft_addr, 0, 0, 0, images.ep, ES_TO_AARCH64); } #endif #endif /* Subcommand: GO */ 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); 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 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 } /* Main Entry point for arm bootm implementation * * Modeled after the powerpc implementation * DIFFERENCE: Instead of calling prep and go at the end * they are called if subcommand is equal 0. */ int do_bootm_linux(int flag, int argc, char *const argv[], bootm_headers_t *images) { /* No need for those on ARM */ if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE) return -1; if (flag & BOOTM_STATE_OS_PREP) { boot_prep_linux(images); return 0; } if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) { boot_jump_linux(images, flag); return 0; } boot_prep_linux(images); boot_jump_linux(images, flag); return 0; } #if defined(CONFIG_BOOTM_VXWORKS) void boot_prep_vxworks(bootm_headers_t *images) { #if defined(CONFIG_OF_LIBFDT) int off; if (images->ft_addr) { off = fdt_path_offset(images->ft_addr, "/memory"); if (off > 0) { if (arch_fixup_fdt(images->ft_addr)) puts("## WARNING: fixup memory failed!\n"); } } #endif cleanup_before_linux(); } void boot_jump_vxworks(bootm_headers_t *images) { #if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI) armv8_setup_psci(); smp_kick_all_cpus(); #endif /* ARM VxWorks requires device tree physical address to be passed */ ((void (*)(void *))images->ep)(images->ft_addr); } #endif